Team:METU-Ankara

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Introduction

MethanE.COLIc project is designed to solve one of the problems of Turkey on worker security in mines, by constructing the natural parts of organisms.The main reason for us to choose such a project is that in Turkey- and also in many countries- each year, huge numbers of workers in mines lost their life due to deficiencies and conditions in their working areas (mines). The release of Grizu gas leads to subsidence of mines and so death of workers.This project is also designed to solve one of universal problem; global warming. Methane gas is a potential greenhouse gas.This project focuses on sensing the ambient methane gas and converting to one of the bio-fuel sources, methanol. Methanol is entrapped by product of one of the constructs of project, and then cells are dead by kill switch device of project to elute methanosol.

Steps

• Methane sensing
• Conversion
• Entrapment
• Kill switch

Team

Hello everyone!We are Metu Ankara IGEM team.Our team consists of high motivated,social and enjoyable “undergraduate and graduate scientists” from departments of physics, chemistry ,biology, computer engineer and computer education & instructional technology. We are such a team that complete each other so that we all experienced team spirit in IGEM. This makes us happy while doing experiences even in the hot summer.Our slogan is “ all for one, one for all”!!Then, who are we?

Instructors

• Prof. Dr. Mahinur S. Akkaya
• Assoc. Prof. Dr.Kürşat Çağıltay

Advisors

• Burak Yilmaz
• Gökdeniz Karadağ

WET LAB

Whole summer in lab work we aimed to design 7 new E.coli compatible Biobricks and 1 composite part from 2011 kit plate distributions, also we aimed to characterize each part by protein analysis and fluorescence protein measurements.

We achieved design and compatibility of parts in E.coli, however not all parts’ characterization is achieved. Only the genes of designed composite part from kit plate is characterized by GFP measurements.

In this section you can find out more details on all our wet lab works. You can also find our data under results subtitle and information about design of our parts-biobricks with explanations in literature. It also contains materials and protocols, and finally There is safety questions list on our safety considerations both in the lab and on a wider environmental scale.

Overview

MethanE.COLIc project arises from sustainability and conservancy of human health and safety. Therefore while we were constructing the organismic device we also wanted to inform people from all age and we wanted to increase the public awareness on our project; methane gas based (firedamp) explosions and the greenhouse effect of methane gas.

Our aim is to inform people in each age. After brainstorming and searching, we planned the content of information and activities according to following subtitles.

Future Plan

Methane explosions called as grisou are one of the main problems from the beginning of the coal mines. All countries have tried different systems to solve this methane problem. When we joined iGEM 2011 competition, our aim is to find a solution to that problem for humanity by cheaper and energy saving way. After a long literature research, we found how seriously dangerous the methane gas is and how people deal with this big problem on coal mines. Below are the countries that have faced with serious methane explosions throughout their history.

1. Australia
2. Belgium
3. Canada
4. Chile
5. China
6. France
7. New Zealand
8. Poland
9. Russia
10. Australia
11. United States

Todays companies deal with this problem by;
Regenerative Thermal Oxidizer from MEGTEC capable of handling 60,000 scfm of VAM. At a methane concentration of about 0.7% a unit this size generates 50,000 carbon credits per year. This unit costs about US$ 1,5 million Elizabeth Obediente from CO2IMPACT at a methane upgrading facility at a coal mine in Alabama. The gas is stripped of impurities and upgraded to 96% methane per volume and then compressed and then sold to the natural gas pipeline. Ventilation Air Methane (VAM): VAM units cost about $20-$30 USD per scfm.

At some mines, downtime is considerable, causing expensive losses to the mine. Ventilation cost cuts can be up to half of the original cost of the ventilation system. In one study, a mine with 400 ft3/ton of methane using vertical wells to pre-drain will result in an estimated US$ 11 million over 20 years in reduced ventilation costs, not including carbon and energy revenue[iii] (U.S. Environmental Protection Agency, 1999). Like many solution system for methane problem, the tree examples of solution of methane problem did not satisfied us, so we created our simple and very effective way to deal with the methane.( http://www.co2impact.com/cmm.html )

According to our methane E colic project, we aimed:

• Save the coal workers’ life
• Save the nature
• Process a new energy
• Obtain a cheap system

Save the coal workers’ life

We aimed to collect the methane gas from coal mines to the tanks which are filled with water. When the methane passes the legal percent that is 1%, according to our project, the gas is dissolved in water in tanks. Then, inside the tablets containing our bacteria and that are already present on the tanks the molecular process for conversion of methane to methanol begins. Below the number of workers dead by years are given according to Prof. Dr. Mustafa ÖZTÜRK’s research,Vice President of Parliamentary Commission for the Environment in Turkey:

Years	Death workers on Turkey
1983	103
1990	330
1995	40
2003	17
2004	3
2005	18
2006	21
2007	7
2008	43

Methane explosions:

Save the nature

Methane is one of the greenhouse gases in the atmosphere. Methane is continuously released from coal mining, livestock, landfills and natural gases to the atmosphere. The accumulation of these greenhouse gases causes one of the greatest problems of Earth: global warming. Our project aims to prevent release of methane gas by the conversion of it to methanol in bacterial system in coal mines.

Greenhouse gases:

Process a new energy

After the conversion of methane to methanol, methanol can be used as a precursor of bio-fuel so that accumulated methanol can be recovered. Ethanol is used as biofuel, also; however, methanol is more cheaper to obtain and use as a biofuel. According to Dr. Robert Zubrin, Methanol is cheaper than ethanol. It can also be made from a broader variety of biomass material, as well as from coal and natural gas. And methanol is the safest motor fuel.(American enterprise, February 13th, 2006).

Cheap system

There are many systems used to prevent or minimize methane explosions. However, they are so expensive to use and none of them are based on a biological system. The biological system that we build contains a bacterial cell having a molecular process of conversion of methane to methanol is completely harmless and cheaper since expensive equipments are not needed.

PartnerShip

Extras

Methane sensing

i) Introduction

In our methane.colic project, the first critical point is to sense the ambient methane gas. While in literature search, we have focused on the methane and DNA or methane and regulator protein interaction which binds to DNA after binding to methane. In structure, methane consists of one carbon atom and four hydrogen atom which means it is smaller in size and weight. Therefore it is hard to find any study based on methane interaction with DNA or protein to regulate transcription. This made us search for carbon hydrogen bond interaction with any oligo or protein to trigger transcription of any metabolite product. So that we also searched the literature for any organism which utilizes any alkane chain and alkane which regulates the transcription of organismal metabolites by interaction with DNA or protein. Since bacteria are environmental adapting organisms, it is possible to find any alkane to regulate the transcription of degradation metabolism. Then we have found the organism, Pseudomonas oleovorans to analyze the alkane degradation of organism for its carbon source.

ii) Background

Many microorganisms live in the environments where the conditions changing frequently and so the evolution is inevitable for mechanisms to withstand unfavorable situations. Therefore microorganisms can use their specific and sensitive mechanisms for sensing the required nutrients for them or any pollution to affect their sustainity. Otherwise they can expose to mutations which change the gene expression and gain new functionalities. In case they have ability to survive in such conditions.

While we were scanning the literature based on methane and alkane degrading organisms we have found some organisms that sensitive to methane presence and have mechanisms to activate transcription of related gene clusters.

We analyzed the soil bacteria, Pseudomonas oleovorans. This strain can assimilate the alkane for its carbon source and one of the microbial whole cell –biosensor. They have a gene cluster which codes for degradative pathway and includes the activator which interacts especially with linear alkanes. This activator protein, AlkS, in the presence of alkanes, induces the transcription from PalkB promoter which initiates the expression of genes code for assimilation of alkanes. We have analyzed the related articles in which the promoter region is studied and showed that it is expressed in E.coli correctly because of the corresponding RNA polymerase binding regions.

REFERENCE:

1. Canosa, I. & Yuste, L. (2000). A positive feedback mechanism controls expression of AlkS, the transcriptional regulator of the Pseudomonas oleovorans alkane degradation pathway. Molecular Microbiology, 35 (4), 791-799.

iii) Modelling

Since the parts that we have found belongs to yeast organism, it was hard to us to manipulate it in bacteria E.coli. We designed the tests of this part by characterizing one of the subunits of methane monooxgenase (MMo). For the functional activity of monooxygenase enzyme, there are required 3 subunits as A,B and C. The A subunit of methane monooxygenase is 210 kDa protein that is supposed as the methane binding active site of monoxygenase complex. This protein consists of non-haem iron and contains p-hydroxo bridge structure. We planned the experiments of this step as characterization of protein A by PCR amplification with specific primers of full construct device to obtained the sequence of protein A. The methane gas is applied to cell culture with our modelled device then the cells were centrifuged and the gas concentration is measured from supernatant.

Clonning procedures

1. Getting the DNA parts
   
   
1. For parts in kit plates
1. With a pipette tip, punch a hole through the foil cover into the corresponding well of the Biobrick^TM-standard part that you want.
2. Pipette 10 uL of dH2O (distilled water) into the well. Pipette up and down a few times and let sit for 5 minutes to make sure the dried DNA is fully re-suspended.
3. Transform 1 or 2 uL of the re-suspended DNA into desired competent cells, plate your transformation with the appropriate antibiotic and grow overnight.
4. Pick a single colony and inoculate LB medium (again, with the correct antibiotic) and grow for 16 hours.
5. Use the resulting culture to miniprep the DNA and make your own glycerol stock.
2. For new synthesized DNA parts
1. The DNA parts are sent in nmol values in each. These data are determined for all of them individually
2. As a stock solution preparation, these DNA parts are pipetted with PCR water or TE buffer which is 100 times of DNA amount. The final solution is prepared as 100uM.
3. For each transformation procedures, the 10uM of stock DNA part in water is transformed. 1uL is taken from stock DNA solution and is added to 9uL PCR water.
   
   
2. Preparation of Competent Cells
   
   
   1. Inoculate a single colony of E. Coli cells into 50 ml LB medium. Grow overnight at 37 C with moderate shaking (250rpm)
   2. Inoculate 4 mL of the culture into 400 mL LB medium in a sterile 2-liter flask. Grow at 37 C shaking at 250 rpm to an OD590 of 0.375.

      This procedure requires that cells be growing rapidly (early- or mid-log phase). Accordingly, it is very important that the growing cells have sufficient air. Overgrowth of culture (beyond OD590 of 0.4) decreases the efficiency of transformation.

   3. Aliquot culture into eight 50 mL prechilled, sterile polypropylene tubes and leave the tubes on ice 5 to 10 min.

      Cells should be kept cold for all subsequent steps.
      Larger tubes or bottles can be used to centrifuge cells if volumes of all subsequent solutions are increased in direct proportion.

   4. Centrifuge cells 7 min at 1600 g,  4 C.

   Allow centrifuge to decelerate without breake.
   We have not attempted to determine whether deceleration without braking is critical to this procedure. However, we do not use the breake for this step or for the subsequent centrifugation steps.

   5. Pour off subernant and resuspend each pellet in 10 ml ice-cold CaCl2 solution.Re-suspension should be performed very gently and all cells kept on ice.
   6. Cetrifuge cells 5 min at 1100 g, 4 C. Discard supernatant and re-suspend each pellet in 10 mL ice-cold CaCl2 solution. Keep re-suspend cells on ice for 30 min.
   7. Centrifuge cells 5 min at 1100 g, 4 C. Discard supernatant and re-suspend each pellet in 2 mL ice-cold CaCl2 solution.

      It is important to re-suspend this final pellet well. The suspension may be left on ice for several days.

   8. Dispense cells into prechilled, sterile polypropylene tubes (250 ml aliquots are convenient). Freeze immediately at -70 C.
3. Transformation
   
   
1. Aliquot 10 ng of DNA in a volume 10 to 25  mL into a sterile 15 mL round bottom test tube and place on ice.

Plasmid DNA can be used directly from ligation reactions. When this is done , more DNA is usually used. However, if there is <1 mg of DNA in the ligation reaction, or if the ligation reaction is from low gelling/melting temperature agarose, it is wise to dilute the ligation mix.

2. Rapidly thaw competent cells by warming between hands and dispense 100 mL immediately into test tubes containing DNA. Gently swirl tubes to mix, then place on ice for 10 min.

Competent cells should be used immediately after thawing. Remaining cells should be discarded rather than refrozen

3. Heat shock cells by placing tubes into a 42 C water bath for 2 min

Alternatively incubate at 37 C for 5 min.

4. Add 1 ml LB medium to each tube. Place each tube on a roler drum at 250 rpm for 1 hr at 37 C.
5. Plate aliquots of transformatin culture on LB /ampicillin or other approprate antibiotic- containing plates.

It is convenient to plate several different dilutions of each transformation culture. The remainder of the mixture can be stored at 4 C for subsequent platings.

6. When plates are dry, incubate 12 to 16 hr at 37 C.
4. Plasmid isolation

This procedure is performed with Fermentas GeneJET™ Plasmid Miniprep Kit

1. Pick a single colony
2. Inoculate in 5 mL LB medium for high-copy or 10 mL for low-copy of LB medium supplemented with the appropriate selection antibiotic.
3. Incubate at 225 rpm not longer than 12-14 h at 37 C .
4. Centrifuge at 4000 rpm for 5 min at 4 C .
5. Discard the supernatant and keep pellet.
6. Resuspend  the pellet with 250 ul Resuspension solution. (Bacteria should be resuspended completely by vortexing until no cell clumps remain)
7. Transfer the cell suspension to eppendorf.
8. Add 250 uL Lysis Solution and mix gently by inverting the tube 4-6 times until the solution becomes slightly clearPlate aliquots of transformatin culture on LB /ampicillin or other approprate antibiotic- containing plates.

Do not vortex!
Do not incubate for more than 5 min. (To avoid denaturation of supercoiled plasmid DNA!)

9. Add 350 uL Neutralization solution and mix immediately and thoroughly by inverting the tube 4-6 times.

(The neutralized bacterial lysate is cloudy and viscous) ("thoroughly" to avoid localized precipitation of bacterial cell debris)

10. Centrifuge at 13000 rpm for 5 min to precipitate cell debris and chromosomal DNA.
11. Transfer the supernatant to spin column (about 600 uL).

(Avoid disturbing or transferring the white precipitate)

12. Centrifuge at 13000 rpm for 1 min.
13. Discard the flow-through.
14. Place the column back into same collection tube.
15. Add 500 uL Wash solution to spin column.
16. Centrifuge at 13000 for 1 min
17. Discard the flow-through.
18. Repeat this step with using 500 uL Wash solution.
19. Discard the flow-through
20. Centrifuge at 13000 rpm for an additional 1 min to remove residual Wash solution.
    (This step is essential to avoid residual ethanol in plasmid preps)
21. Transfer spin column into a fresh 1.5 mL epp.
22. Add 50 uL Elution buffer into center of the spin column membrane to elute the plasmid DNA

Do not contact the membrane with pipette tip!

23. Incubate for 2 min at 25 C. 

To increase yield incubation is done for 2 min at heat block at 42 C

24. Centrifuge at 13000 for 2 min.
25. Discard the column and store the purified plasmid DNA at -20 C.

OPTIONAL= additional elution step with elution buffer or water. This step increases the yield by 10-20 %.
NOTE:  For elution of plasmids ≥ 20 kb, prewarm Elution buffer to 70 C before applying.

5. Restriction digestion

This procedure is performed with NEB  BioBrick™ Assembly Kit

• Digest Upstream Part with EcoRI-HF and Spel
  500 ng Upstream Part Plasmid
  1 uL EcorI-HF
  1 uL Spe I
  5 uL 10XNE  Buffer 2
  0.5 uL 100X BSA
  To 50 uL add dH2O
  
  
• Digest downstream part will  Xbal and PstI
  500 ng Downstream Part Plasmid
  1 ul XbaI
  5 uL 10X NE Buffer 2
  0.5 uL 100X BSA
  To 50 uL add dH2O
  
  
• Digest the destination plasmid with EcorI-HF and Pst I:

The destination plasmid DNA should either be prepared with PCR or contain the toxic gene (e.g, ccdB, sacB) in the cloning site to avoid the need for gene purification.
The Destination Plasmid should also have a different antibiotic resistance marker from both the plasmid containing the Upstream Part and the plasmid containing the Downstream Part to avoid the need to purify the Upstream and Downstream Parts.
500 ng Destination Plasmid DNA
1 uL EcorI- HF
1 uL PstI
15 uL 10X NE Buffer 2
0.5 uL 100X BSA
To 50 uL add dH2O
 
Incubate all 3 restriction digest reactions at 37 C for 10 min and then heat inactivate at 80 C for 20 min.

6. AGE (Confirmation)

Background

• EtBr stains only dsDNA. You cannot see ssDNA on gel
• Minimum amount of DNA load:

300 ng
• Each band of 1kb ladder is approximately 125 ng (2.5 ul loaded) and can be seen on gel

Preparation

• 50X TAE (Tris-Acetate) Buffer
  121 g/0.5 L Tris
  28.6 g/0.5 L Glacial Acetic Acid
  7.31 g/0.5 L EDTA
  pH 8.0
  
• Sterile 1.5 mL eppendorf tubes
• Sterile long pipette tips
• DNA standards
  • Promega 1.0 kb (1.0-10Kbp), 100 bp (0.1-1.0 Kbp)
• TAE Buffer
• EtBr sln (10 mg/mL). Purchase as solution ! Store at RT. Light-sensitive and carcinogenic !
• Sample loading buffer. Store at 4 C.

Protocol

• Prepare 360 ml, 1X TAE running buffer
• Prepare gel compartment with tape (do not use parafilm)
• Prepare 60 ml, 1% agarose gel (0.6 g agarose in 60 ml 1X TAE buffer)
  • 1-2 min in microwave. Check and swirl after each 30 sec. It must be dissolved completely.
• Add 1.0 ul EtBr (10 mg/ml) per 10 ml gel solution, swirl to mix
• Add add 4 ul EtBr (10 mg/ml) per 100 ml running buffer.
• Pour gel into gel compartment. Put comb.
• After gel solidifies (30 min), take out the comb and load buffer to one well to measure its capacity.
• Position the gel compartment and fill gel chamber with running buffer.
• Prepare samples and standards (ladder)
• Prepare samples by mixing 4 ul 6X Loading Buffer + 20 ul sample
• Load the samples (for 24 ul sample, set pipette 24 ul).

Do not push the tip to the bottom of the wells. Make a 45 degree angle and support the pipette tip on the edge of the well. Don’t worry, gel will not brake when you take support. Slowly release the sample. Do not use second pipet push not to risk air injection.

• Make the connections: Black (-) on sample side, Red (+) opposite side
• Run at 60V
  5-10V/cm (distance between anode and cathode) is recommended.
  90V causes high heat generation for our unit. Use 60V maximum.
  For overnight runs: 2V is too low, causes diffusion
  35V / 4hrs / ¾ progress
• Gel can be stored in 4 C until next day after completion

Gel Photo

• Adjust zoom and position using visible light
• Before turning on UV load your settings file which has the following parameters:
  • Preview tab, all three options checked
  • Active image
  • Dynamic integration, auto exposure, 10 frames
  • 50/50 brigthness/contrast
• Maximize brigthness with camera knob (counterclockwise)
• Turn on UV light
• Lower brightness from camera knob if necessary

 

7. Gel extraction (For Fermentas Gel Extraction Kit)
   
   
   1. Excise gel slice containing the DNA fragment using a clean scalpel or razor blade. Cut as close to the DNA as possible to minimize the gel volume. Place the gel slice into a pre-weighed 1.5 ml tube and weigh. Record the weight of the gel slice.

   Note: If the purified fragment will be used for cloning reactions, avoid damaging the DNA through UV light exposure. Minimize UV exposure to a few seconds or keep the gel slice on a glass or plastic plate during UV illumination.

   2. Add 1:1 volume of Binding Buffer to the gel slice (volume: weight) (e.g., add 100 µl of Binding Buffer for every 100 mg of agarose gel)
   p>Note. For gels with an agarose content greater than 2%, add 2:1 volumes of Binding Buffer to the gel slice.
   3. Incubate the gel mixture at 50-60°C for 10 min or until the gel slice is completely dissolved. Mix the tube by inversion every few minutes to facilitate the melting process. Ensure that the gel is completely dissolved. Check the color of the solution. A yellow color indicates an optimal pH for DNA binding. If the color of the solution is orange or violet, add 10 µl of 3 M sodium acetate, pH 5.2 solution and mix. The color of the mix will become yellow
   4. Optional: use this step only when DNA fragment is <500 bp or >10 kb long.
      • If the DNA fragment is <500 bp, add a 1:2 volume of 100% isopropanol to the solubilized gel solution (e.g. 100 µl of isopropanol should be added to 100 mg gel slice solubilized in 100 µl of Binding Buffer). Mix thoroughly
      • - If the DNA fragment is >10 kb, add a 1:2 volume of water to the solubilized gel solution (e.g. 100 µl of water should be added to 100 mg gel slice solubilized in 100 µl of Binding Buffer). Mix thoroughly.
   5. Transfer up to 800 µl of the solubilized gel solution (from step 3 or 4) to the GeneJET™ purification column. Centrifuge for 1 min. Discard the flow-through and place the column back into the same collection tube. 

   Note. If the total volume exceeds 800 µl, the solution can be added to the column in stages. After each application, centrifuge the column for 30-60 s and discard the flow-through after each spin. Repeat until the entire volume has been applied to the column membrane. Do not  exceed 1 g of total agarose gel per column.

   6. Optional: use this additional binding step only if the purified DNA will be used for sequencing

      Add 100 µl of Binding Buffer to the GeneJET™ purification column. Centrifuge for 1 min. Discard the flow-through and place the column back into the same collection tube.

    
   7. Add 700 µl of Wash Buffer (diluted with ethanol as described on p. 3) to the GeneJET™ purification column. Centrifuge for 1 min. Discard the flow-through and place the column back into the same collection tube.
   8. Centrifuge the empty GeneJET™ purification column for an additional 1 min to completely remove residual wash buffer.

   Note. This step is essential to avoid residual ethanol in the purified DNA solution. The presence of ethanol in the DNA sample may inhibit downstream enzymatic reactions.

   9. Transfer the  purification column into a clean 1.5 ml microcentrifuge tube (not included). Add 50 µl of Elution Buffer to the center of the purification column membrane. Centrifuge for 1 min.

   Note:

   • For low DNA amounts the elution volumes can be reduced to increase DNA concentration. An elution volume between 20-50 µl does not significantly reduce the DNA yield. However, elution volumes less than 10 µl are not recommended.
   • If DNA fragment is >10 kb, prewarm Elution Buffer to 65°C before applying to column
   • If the elution volume is 10 µl and DNA amount is ≤5 µg, incubate column for 1 min at room temperature before centrifugation
   10. Discard the GeneJET™ purification column and store the purified DNA at -20°C
8. Ligation

This procedure is performed with  NEB BioBrick™ Assembly Kit

1. Ligate the Upstream and Downstream Parts into digested Destination Plasmid.
   • 2 uL Upstream Part Digestion
   • 2 uL Downstream Part Digestion
   • 2 uL Desination Plasmid Digestion
   • 2 uL 10X T4 DNA ligase bufferl
   • 2 uL T4 DNA ligase buffer
   • 11 uL dH2O
2. Incubate at RT for 10 min and then heat inactivate at 80 C for 20 min.
3. Transform 2 uL of the ligation product into 50 uL of competent E.Coli cells ( or other suitable host strain).
4. Select using the antibiotic corresponding to the Destination Plasmid.
   
   
9. Glycerol Stock Preparation
   
   
   1. Centrifuge 5 mL overnight cells at 5000 rpm for 5 min.
   2. Discard 4 mL supernatant, remain 1 mL with pellet.
   3. Add 176 uL 15% glycerol  and resuspend the pellet.
   4. Aliquot 100 uL and immediately freeze at -70 C.
      
      
10. Cell imaging

Checklist Procedure

1. Suspension culture preparation
• Dissolve a single colony in 10 mL LB+Amp
• Incubate 14-15 hrs, shaking at 225 rpm
  
  
2. Scale-up of the suspension culture
• Add 2-3 mL of the suspension culture to 100 mL LB+Amp
• Incubate 5-6 hrs, shaking at 225 rpm
  
  
3. Equalizing OD readings
• Take 10 mL samples from GFP/RFP & NC cultures
• Centrifuge at 10000 rpm for 5 mins
• Discard supernatant
• Resuspend pellet in 500 uL 1X PBS
• Take 250 uL & dilute to 3 mL with 1X PBS
• Read in UV-Vis at 600 nm
• Multiply the OD readings by 12
  
• Dilute remaining 250 uL samples as required to make all samples have the same ODvalue, final volume should also be 250 uL
  
  
4. Fluorescent signal reading
• Set parameters
  [GFP]
• Mode: Emission scan
• Config: Digital
• Slit: 1 turn / 2 nm
• Blaze: 750 nm
• Excitation: 395 nm
• Emission range: 475-600 nm
• Average: 3
• Step size: 5 nm
  [RFP]
• Mode: Emission scan
• Config: Digital
• Slit: 1 turn / 2 nm
• Blaze: 750 nm
• Excitation: 570 nm
• Emission range: 585-650 nm
• Average: 3
• Step size: 5 nm
• Transfer samples to small 150 uL cuvette and scan
5. Data Analysis
• Emission maxima:
  GFP 515 nm
  RFP 605 nm
• Record intensity values at 509 nm for GFP & 606 nm for RFP
• Subtract NC intensity value from GFP/RFP value
• Result is the fluorescent signal of the protein in the bacteria
  
  
11. Protein expression

MAIN STEPS/TIME TABLE
- Pre-culturing/5 hours
- Culturing/5 hours
- IPTG induction/15 hours

Materials
- LB medium with a suitable antibiotic
- TB medium with a suitable antibiotic
- IPTG
- 2-liter flask
- Incubator with shaker
- Centrifuge

Check List Procedure
- Culture transformed E.coli BL21 for 5 hrs at 37 C in 10 LB medium containing antibiotic
- Inoculate 4 ml pre-cultured cells into 400 ml of TB medium containing antibiotic in a 2-liter cultivation flask
- Culture it for 5 hrs at 37 C with a rotary shaker at 180 rpm!
- Add 0.5 mM IPTG in a final concentration
- Continue the cultivation for 15 hrs at 22 C.
- Harvest the cells with centrifuge.

Alternative Check List Procedure
- Inoculate single colony for 5 hrs at 37 C in 10 mL LB medium containing antibiotic
- Inoculate 4 ml pre-cultured cells into 400 ml of TB medium containing antibiotic in a 2-liter cultivation flask
- Culture it for 5 hrs at 37 C (OD600 to 0.5 - 0.6) with a rotary shaker at 180 rpm
- Add 1 mM IPTG in a final concentration ( 0.5- 2.0 mM recomended for pT7)
- Continue the cultivation for 3-4 h at 37 C (15 hrs at 22 C.)
- Harvest the cells with centrifuge.

Solutions
- TB (Terrific Broth)

Reference: http://www.embl.de/pepcore/pepcore_services/protein_expression/ecoli/




SDS-PAGE
MATERIALS   
- Vertical Electrophoresis apparatus
- Power supply
- pH meter
- Balance
- Silver staining shaker platform
- Transilluminator
- Filter paper

For Gel preparation
- Acrylamide
- Bisacrylamide
- Deionized Water
- Tris base
- SDS
- APS
- TEMED

For Silver Stanning
- Fixer
- %50 ethanol
- Pretreatment solution
- Silver nitrate
- Devoloping solution
- Stop solution

- Marker: Fermentas / Page Ruler Protein Ladder SM0661 (10-200kDa)

SOLUTIONS
Running Buffer (10L, 1X)

- 25mM Tris, pH 8.3
- 250mM Glycine
- 0.1% SDS
or
- 60 ml 10X stock + 6 ml 10% SDS + 534 ml dH2O
-----------------------
- 30.3g Tris
- 187.7g Glycine
- 10g SDS
- Final volume 10 L in demijon

Staining Solution (Coomassie Blue) ( 1 L, 1 X)
- 2 g brilliant blue (R-250)
- 450 ml methanol
- 450 ml dH2O
- 100 ml acetic acid
- store at 24 C

Destaining Solution ( 4 L, 1 X)
- Methanol:Acetic Acid:dH2O 40:10:50
- Prepare 4.0 L (1.6 L MeOH, 0.4 L AcA, 2.0 L dH2O) in 1 gallon amber bottle, cap tightly
- store at room temp.

4X Sample Loading Buffer
- 400 mM DTT
- 40 mM Tris
- 10% Glycerol
- 4% SDS
- 0.4% Bromophenol blue

- prepare 15 ml
- 925.2 mg DTT
- 72.6 mg Tris
- adjust pH to 6.8
- 1500 ul Glycerol
- 600 mg SDS
- 6 mg Bromophenol blue
- aliquot 50 x 600 ul
- store at -20 C

30% Acrylamide 1% Bis-acrylimide
- prepare in laminar flow
- 30 g acrylimide and 1 g bis-acrylimide in 100 ml
- 75 mL acrylimide solution ( 40% stock, Apllichem) and 25 mL bis-acrylimide solution  ( 2% stock, Apllichem)to final volume 100 ml
- store at 4 C, stable for 1 month

Seperating Gel Buffer
- 1.5 M Tris pH 8.8
------------------------------------------
- for 100 mL Buffer solution
- 18,15 g Tris pH 8.8
- store at room temp.

Stacking Gel Buffer
- 0.5 M Tris
------------------------------------------
- for 50 mL Buffer solution
- 3 g Tris pH 6.8
- store at room temp.

APS (Ammonium Persulfate)  Stocks (100 mg/ml)
- dissolve 0.6 g in 6 ml dH2O
- aliquot 10 x 600 ul and store at -20 C

1% Bromophenol Blue
- 0.01 g in 1 ml 1M Tris, pH 7.0
- store at room temp. in amber bottle

CASTING 13% GEL
- set heater to 100 C for sample prep step


  Seperating Gel (30 ml)
  - 13 ml 30% Acrylimide 1% Bis-acrylimide
- 7.5 ml seperating gel buffer
- 8,45 ml dH2O
- 500 ul %10 SDS
- 250 ul APS (initiator of polymerization)
- 25 ul TEMED (catalyst of polymerization)

- Load 5.4 ml separating gel between glasses

  Stacking Gel (10 ml)
  - 1.6 ml 30% Acrylimide 1% Bis-acrylimide
- 2.5 ml stacking gel buffer
- 5.85 ml dH2O
- 100 ul %10 SDS
- 15 ul 1% Bromophenol Blue
- 50 ul APS (initiator of polymerization) [add after resolving gel is casted]
- 10 ul TEMED (catalyst of polymerization) [add after resolving gel is casted]

- Load 1.7 ml stacking gel between glasses
- Inset the comb - make sure the comb has not been inserted in a tilted way. check from behind the apparatus

- load seperating gel
- add some butanol or isopropanol before resolving gel solidifies
- make sure gel stays on flat surface while solidifies to prevent tilted surface
- load stacking gel


- if bubbles form in the stacking gel after polymerization, press the plates between hands to push them out

SAMPLE PREPARATION AND LOADING

- Do not overload the the samples, purity check is difficult with overloaded samples.
- Sample volume: 5 ul sample+ 5 ul loading buffer + 10 ul dH2O
- vortex loading buffer before use
- put samples in heating block (100 C) for 5 min
- if possible, do not load into the first and last lanes
- load 5 ul marker
- load 17 ul samples


PREPERATION
- check the wire on running apparatus, clean and test

RUNNING
- never terminate the run early, lighter bands dont separate
- 600 ml running buffer is required for each run

Running Standards
- 5 mA > 3/4 of gel > 25hrs >>> overnight running
- max: 80 mA for both old and new gel systems
- For Lab 103 Tankı
   - for 145 min at 30 mA 120 V through seperating gel
   - amper constant

After Run
- wash electrophoresis unit after each use
- weekly cleaning of power connections recommended to prevent oxidation<

STAINING
- Stain the gel for 30 min

DESTAINING
- load the tray fully with destaining buffer
- do not put too many (over-destaining) or too less (under-staining) paper sheets
- destaining takes 2-3 hrs

12. Device Experiments

MAIN STEPS/TIME TABLE
- Pre-culturing/7 hours
- Culturing to 250ml flasks/3 hours

Materials
- LB medium with a suitable antibiotic (Ampicillin)
- 250 ml flasks
- Incubator with shaker
- Centrifuge

Check List Procedure
- Cell culture (with ROSE regulated kill switch) transformed E.coli BL21 for 7 hrs at 37 C in 10 ml LB medium containing antibiotic
- Inoculate 100ul pre-cultured cells into 100 ml of LB medium containing antibiotic in a 250 ml cultivation flask
- Culture it for 3 hrs at 37 C with a rotary shaker at 220 rpm up to OD reading reaches to 0.3
- Continue taking OD readings up to 0.7 at 37C.
- Harvest the 5 ml of cells with centrifuge for 5 min at 5000rpm.
- Resuspend in 5ml PBS and take fluorescence readings.

Online Lecture

Anybody interested and novice in Synthetic Biology can use the lecture;

Here is our animation; Industrial Revolution 2 After Synthetic Biology, to introduce the basics of the field;

Here is Our Online Lecture, Click the picture to go;

Collaboration

Collaboration with Turkish teams in iGEM 2011

Since iGEM 2007, there is a team to research and prepare a project for iGEM competition from Middle East Technical University(METU).  On behalf, there are advisors and instructors who are familiar with competition and content of it. In this year there are 4 registered teams from Turkey and 3 of them are new participants. Therefore, in order to come together and criticize our projects and any deficiencies or ambugity related with project, we organized and arranged a meeting on Synthetic Biology and iGEM competition which is the first in our country.The participants of this meeting were teams;Fatih Turkey, Bilkent_UNAM, METU-BIN and researchers who related with Synthetic Biology and company owners in Biotechnology field also there was special guests via online talk, Drew Endy, he is an assistant Professor of Bioengineering, Stanford University and Scott Mohr Professor of Biological Chemistry, Boston University. This meeting was held in September 10, that was close to Regional Jamboree in order to also check the presentation preparations of teams. The news agencies were also invited and the interviews were done with all teams publicity of teams were enhanced.

Except from this, we established a collaboration with METU-BIN Software iGEM 2011 team  on their software program. This year their project, M4B: Mining for BioBricks is on enhancement and simplification of parts registry and gene library usage to ease the wet lab researchers job. They requested us to use and try their software program. One of our parts in this year, kill switch is composite of this year distributions. By the way we tried their program to search and try on this composite. we gave them the following as feedback and also according to our comments on visual of program, we had collaborated this year.

“We are constructing a device that is induced by IPTG and that gives lysis enzymes and GFP as the outputs because, in order to elute methanol we need to kill our modified cells that convert ambient methane to methanol and the reason why we want GFP as one output is to be sure that it works. Our modelled device has promoter induced by IPTG, RBS, gene coding GFP and lysis cassette ending with cell death and we are glad to have it and it's working how we expected. So then, we use M4B to see that if it finds the exact device or the device that can do the same job. Since the software has only one place for output, we queried IPTG as an input and GFP as an output on the software and got corresponding 117 results. These results contain devices exactly what we have one for the same operation. However, we couldn't find the lysozyme output for the IPTG input in the software.”  

We had requested them to support us on wiki page design and same tricks on loading the links on wiki page. We had prepared the self evaluating lab safety questionnaire and they made them manipulable on wiki page  and the methane release meter on home page is their work.

Helping to other new Turk teams in the future

Our university, METU has an online lecture application; METU OpenCourseware to support the open information source not only members of METU  and to reach people to inform in all ages. In this online application, For Synthetic Biology field, last year the sessions were loaded and this year it is upgraded. The protocols for Synthetic biology methods were downloaded and supported with tutorials of procedures that taken during experiments. We established this page and enhanced for Synthetic Biology to reach more students to meet with Synthetic Biology in any region of Turkey. We had requested  from President of METU made people to reach this webpage from universities with related departments in an official way. By the way, we believe to reach more students or researchers to iGEM competition and Synthetic Biology.

Collaboration with 2011 Uppsala Sweeden iGEM Team

We asked them to use and give feedback to our software tool on our wiki. This tool is named as BioGuide which was first studied on last year’s competition iGEM 2010 and gained silver medal. This year this team joined with wet lab team. While they were progressing the BioGuide project, this software tool also supported the web page and experiments of METU_Ankara team. We publish this software program on our wiki page to made other iGEM teams to reach and benefit from program on part  and path choices. Uppsala-Sweeden team was one of the teams that use and try the BioGuide program. They tried to reach their used parts in kit distributions and then gave us feedback on them.

They tried this software tool according to parts of their project As an input parameters they tried to type red light 'cph8',  blue light 'LovTAP', green light 'Ccas', IPTG(PT5-Lac), YF1 and as output parameters they typed amil GFP, amil CP and mCHERRY.  However they found the library of program restricted and they could not reach all parts  because BioGuide software tool library is designed and programmed on parts that are in 2010 and 2011kit plate distributions. By the way, they found this software program managable. Given part names or input and output data results with Biobrick codes of parts in parts registry library. Therefore, it made easier their job on longstanding assembly plans. For mutual collaboration, we read and evaluated their Biosafety web page and gave feedback below

“You replied the first question having main title “materials used in your project” as bacteria strain used in your project. We suggest that you should focus on chemical or any other material to answer this question.However we also used the E.coli Top 10 as host strain and found that these strains are classified as hazard group 2 pathogen by the UK Advisory Committee on the Dangerous Pathogens (ACDP).
In the question 3 that you explained “Institutional Biosafety Committee”, you described the threats of Synthetic biology in 3 main items based on your interview, we think you should expand content of items.

And lastly, it would be better if you give more detail on your last question to be more clear for future iGEM teams.”

https://2011.igem.org/Team:Uppsala-Sweden/Feedback

Software Tool

BioGuide is a Biological System Design tool. It has been developed in 2010 by the team METU TURKEY SOFTWARE. You can check the page for detailed information about the project :
https://2010.igem.org/Team:METU_Turkey_Software

Here is rough draft and setup of BioGuide Paper you can read for technical details and download the software;

BioGuide.pdf

Download the Software

This year;

We have completed biological system design part of BioGuide and enabled wet lab teams to use it.

You can watch the how to video of BioGuide to see what and how you can do with it;

Here is how METU ANKARA wet lab team is using BioGuide;

This year we are using it while building one of our devices, kill switch composite. Kill switch composite consists of 4 main parts which are in 2011 kit plate distributions; T7 promoter, RNA thermometer, GFP and lysis casette. The upstream part of this composite is T7 promoter (BBa_I712074) which is strong promoter from T7 bacteriophage mostly used expression system and so for strong transcription T7 promoter expression system is chosen.

We also tried the inducible promoters (pLac-IPTG inducer) to design and express the lysis casette. We desired to use a promoter that could be induced and enhance the expression to control and manipulate the translation of device. When we typed IPTG on input box of Bioguide we had reached the possible promoters that could be induced by IPTG. This program gave their standard biobrick codes and finally we got these parts by knowing their location in kit plate.

In downstream of promoter there is RNA thermometer(ROSE) coding region which determines the transcription of our lysis composite part. We had reached this part by coding the temperature 42 in input box of BioGuide. RNA thermometer (BBa_K115001) is temperature sensitive at which 42C translation initiates.

In downstream of RNA thermometer, green fluorescence protein(BBa_E0040) is ligated. This ligation is done to measure expression level and to comment on RNA thermometer efficiency. We typed GFP in output box since we wanted to measure fluorescence.

We had designed this composite and it's parts mostly by processing the BioGuide program that made our job easier in intense lab works. We reached the shortest path with our input and output parameters for this device to construct by BioGuide

Conversion

i) Introduction

When examined in order, conversion is the second step of device system. While in literature searches, it is found that methanotrophs which live in either extreme conditions or in deep oceans, the process is the same, methane is converted to methanol which is the oxygenated form of hydrocarbon group. The searches directed us to organism Methylococcus capsulatus which is one of the mostly studied organisms among methanotrophs. We designed the conversion part of this organism and modified coding operon according to E.coli strain to enhance the expression. The monoxygenase coding part with protein A, B and C products are designed for conversion step of this project.

ii) Background

Methanotrophs - methane oxidizing bacteria- are ubiquitous in the environment and play an important role in mitigating global warming because they are a unique group of gram-negative bacteria that grow aerobically on methane as sole source of carbon and energy (Hanson and Hanson 1996). They are also potentially interesting for industrial applications such as production of bulk chemicals or bioremediation. Methanotrophs converts methane to methanol and subsequently to formaldehyde which is assimilated or further oxidized to CO2 for biosynthesis of cellular forms.In this biosynthesis pathway the conversion of methane to methanol is catalysed by methane monooxygenase (MMO) which is a non-specific enzyme complex that also catalyse the oxidation of a wide range of aliphatic, alicyclic and aromatic compounds (Colby et a l . , 1977; Higgins et a l . ,1979). The first step in the oxidation of methane to precursors of organic compounds is the conversion to methanol by methane monooxygenase, the key enzyme, which exists in two forms: the cytoplasmic, soluble methane monooxygenase (sMMO) and the membrane-bound, particulate methane monooxygenase (pMMO). sMMO components have been expressed in heterologous and homologous hosts. Therefore we searched more on soluble form of monooxygenase enzyme. When analyzed in detail, pMMo differs from sMMo by copper ion concentration. Copper ions have been shown to play a key role in regulating the expression of both MMO enzyme complexes. When its concentration increases the differentiation goes through particulate form. Here we analyzed the soluble form of methane monooxygenase to express in heterologous host.

a) Soluble Methane Monooxygenase

In contrast to pMMO, sMMO has extremely broad substrate specificity and can oxidise a wide range of non-growth substrates such as alkanes, alkenes and aromatic compounds thus making it the more attractive enzyme for co-oxidation reactions. sMMO is expressed only under conditions in which the copper-to-biomass ratio is low, i.e. under “low-copper” growth conditions, when copper ions are omitted from the trace elements solution of a standard mineral salts medium or cells are grown in a fermentor to high cell densities.There is also some evidence that copper ions inhibit the activity of sMMO (Jahng and Wood 1996). Like many other multi-component oxygenase systems, sMMO contains a component of approximately 16 kDa, Protein B, which serves an “effector” or regulatory role. The activity of Protein B may be regulated by proteolysis at its amino terminus (Lloyd et al. 1997). At low concentrations, Protein B converts the hydroxylase from an oxidase and stabilizes intermediates necessary for oxygen activation. Saturating amounts of Protein B dramatically increase the rates of formation of intermediates and accelerate catalysis of methane to methanol by sMMO (Lee and Lipscomb 1999). When analyzed, the most extensively characterised sMMO enzymes are those from Methylococcus capsulatus (Bath) and Methylosinus trichosporium OB3b (reviewed in Lipscomb 1994; Deeth and Dalton 1998). Therefore we preferred to study on Methylococcus capsulatus (Bath) for monooxygenase.The sMMO is a non-haem iron-containing enzyme complex consisting of three components. The hydroxylase consists of three subunits of 60, 45 and 20 kDa arranged in an α2 β2 γ2 configuration. sMMO genes are clustered on the chromosome of Methylococcus capsulatus (Bath) and Methylosinus trichosporium OB3b. mmoX, mmoY and mmoZ encode the α-, β- and γ-subunits respectively of the hydroxylase. mmoB and mmoC code for Protein B and the reductase component. Interestingly, mmoB lies between mmoY and mmoZ; an ORF of unknown function, designated orfY, with a coding capacity of 12 kDa, lies between mmoZ and mmoC in all genes clusters analysed to date (McDonald et al. 1997).

REFERENCE:

1. J. Colin Murrell · Bettina Gilbert · Ian R. McDonald, (2000), Molecular biology and regulation of methane monooxygenase Arch Microbiology(2000) 173 :325–33
2. Colby, J . & Dalton, H. (1978). Resolution of the methane monooxygenase of Methylococcus capsulatus (Bath) into three components. Biochemical Journal 171,461-468
3. Hanson Te&Hanson RS(1996) Methanotrophic bacteria.American Society forMicrobiology.Microbiol. Rev., Jun 1996, 439-471, Vol 60, No. 2
4. Charlotte, A., West, G. & Horward, D. (1992). Functional expression in Escherichia coli of proteins B and C from soluble methane monooxygenase of Methylococcus capsulatus (Bath. Journal of General Microbiology, (138), 1301-1307.

iii) Modelling

For this step of MethanE.COLIc project, the experiments were planned and modelled as protein characterizations. The protein B and C were previously characterized and analyzed proteins in literature. Based on this publications we planned the experiments as purifying protein from cell extract then SDS-PAGE analysis.

Biobricks

Public Awareness

5-10 year old group

For this age group, we prepared and modified one of the national child game. In this game there is a circle of group of child, one is not included in that circle. He/she runs around the circle and labels two of the participants in the circle. When the labelled kids realized that, they leave the circle and new kids join the circle. The video below shows our modified game in which four kids that out of circle are our restriction enzymes wearing white caps. Moreover, we have three insert groups which wear red, green and yellow caps. The blue capped ones are our backbone.
During the game we explained kids what DNA, enzyme and insert are, and what we have done as a Synthetic Biology research group.

10-17 year old group

This group consists of high school aged children groups.Through out the workshop, we have paired them in doubles. Firstly, we have explained Synthetic Biolgy and what Synthetic Biology is able to do. After these training, we explained them our project and taught them basic molecular biology procedures and what are the requirements of basic synthetic biology based experiments. We have done the experiments (cloning procedures) together and also they did individually. We also encouraged them to join iGEM High School division.

18-24 year old group

This group consists of METU students. We arranged the Physics lectures in order to reach students from several departments. We explained the miracle of Synthetic Biology and our project. At the end of the presentation, we gained many volunteers to join METU-iGEM team for the following years. Also, we have an online lecture application as METU open course ware. For this web page, we have prepare the course notes and they were uploaded to reach many students from all around to inform and contact for further relations about Synthetic Biology.
In addition, we distributed hand outs about our project and Synthetic Biology at METU campus, when the registration of new students were done. We aimed to inform students about our project and about Synthetic Biology to attract their attention on the issue.

Online lecture link:&nbsp: http://ocw.metu.edu.tr/course/view.php?id=137

Above 24 year old

For this group of people we met with group of engineers who work in mining fields in Turkey. We explained our project in details and consulted them on background of our project. What the conditions in mines are, what the general regulations for worker safety are and what the rooted controls for any gas release are the main points which we discussed on.

List of Engineers:

Turkish Architects and Engineers Association members:

NO	NAME & SURNAME	INSTITUTION	CITY
1	Başak GÜLEKEN	ERKUNT DÖKÜM A.Ş.	ANKARA
2	Saliha SİVRİ	ETİ MADEN İŞLETMELERİ	ANKARA
3	Aynur ODAMAN	KOSGEB	ANKARA
4	Mehmet Şevki TÜRÜDÜ	MADEN TETKİK ARAMA KURUMU	ANKARA
5	Galip Şevket YİNSEL	MİTAŞ A.Ş	ANKARA
6	Cemil Hakan GÜR	ORTA DOĞU TEKNİK ÜNİVERSİTESİ	ANKARA

Sponsors

As METU Ankara iGEM 2011 team we would like to thank to our partners and sponsors in listed below for their supports and for their encouragement.

Cargill Comart

Sentegen

MetuTech

Onkogen

Sacem

Metu

Entrapment

i) Introduction

After conversion of methane to methanol, the successive step is the entrapment of methanol. Methanol is an alcohol form of hydrocarbon methane and includes hydroxyl group. Hydroxyl radical groups are highly reactive and, and so short-lived; however, they form an important part of radical chemistry. Hydroxyl groups are especially important in biological systems and their chemistry because free radicals tend to form hydrogen bonds both as donor and acceptor. This property is also related to their ability to increase hydrophilicity and water solubility. Therefore hydroxyl free radicals cause damage to oxidative cells and cellular membranes. In order to produce the methanol for further industrial manufacturing in cellular organism, the organismic conditions should be adjusted. In the light of this, for our bacterial system we transferred the protein coding sequence(named as LUSH) of Drosophilia melanogaster to attack to free methanols and hydroxyl group. Here is some structural information about protein LUSH.

ii) Background

LUSH is an alcohol-sensitive odorant binding protein expressed in the olfactory organs of Drosophila melanogaster, and it is used as a model system to investigate the biophysical nature of alcohol-protein interactions at alcohol concentrations that produce intoxication in humans. In this study, by using NMR spectroscopy, they have identified the regions of LUSH that show increased conformational stability on binding alcohols. These residues primarily line the alcohol-binding pocket. A direct measure of the degree of stability that alcohol imparts on LUSH has been provided. LUSH was originally identified as responsible for mediating an avoidance response to short-chain n-alcohols.

The general structure of odorant binding proteins consists of six α-helices surrounding a hydrophobic ligand- binding pocket which differs in size and shape between each protein. All these odorant binding proteins have a set of six cysteines that form three conserved disulfide bonds. In the study, by observing the X-ray crystal structures of LUSH-alcohol complexes, it was found that alcohol binds to a single site in the protein formed by a network of concerted hydrogen-binding residues located at one end of hyrophobic pocket. This binding site has some sequence and/or structural similarities to regions of several ligand gated ion channels (LGICs) that have previously been implicated in inferring sensitivity to alcohol. It is hypothesized in the study that the alcohol-binding site in LUSH may represent a more general structural motif for functionally relevant alcohol-binding sites in proteins. The characterization of the effects of n-alcohols on the structure and stability of LUSH is presented. Also, in the absence of ligand, LUSH exists in vitro in a partially unstructured state and binding of alcohols shifts the solution conformation to a more compact folded state which is accompanied by an increase in the overall protein stability. Those regions of the protein that show the largest changes in local dynamics on binding alcohol have been identified and it have been shown that these are predominantly associated with the residues that line the alcohol-binding pocket. The results provide a quantitative measure of the ability of short-chain alcohols to stabilize protein structure at physiological relevant concentrations.

REFERENCE:

1. Bucci, B. K., Kruse, S. W. & Thode, A. B. (2006). Effect of n-Alcohols on the Structure and Stability of the Drosophila Odorant Binding Protein LUSH. Biochemistry, 45 1693-1701
2. Thode, A. B., Kruse, S. W. & Nix, J. C. (2008). The role of multiple hydrogen bonding groups in specific alcohol binding sites in proteins: Insights from structural studies of LUSH. J.Mol Biol, 376 (5), 1360-1376

iii) Modelling

In MethanE.COLIc project, LUSH protein is designed to hold methanol; the conversion product of methane. Methanol is bounded to LUSH protein through its hydroxyl group. In device experiments of this part, we planned to isolate and denaturate protein and then refold in presence of methanol and we planned to analyze the alcohol bounded protein in X-ray diffraction crystallogrophy.

Notebook

Media Press

Middle East Technical University

Middle East Technical University is a pioneering university in education, research and community service in the country. In addition to being highly preferred by students, it is internationally recognized.Our country is successfully represented by METU academic staff in numerous scientific and professional institutions and committees.The wide variety of cultural, artistic and intellectual activities, and sports opportunities that are offered by our campuses are a part of the "education environment" of international quality. METU has been defined in national rankings as the university which has the "Richest Social Environment".Whatever your reason to visit METU is, you will find here an innovative, dynamic and exciting environment which offers diversity and variety of choices. Come and join us at METU where the most successful students of the country, the most outstanding teaching and research staff, and the most distinguished administrative-technical staff live, learn, and produce hand in hand...

For more information, visit following link;

Middle East Technical University

Kill switch

i) Introduction

In this project the last step is the death of our bacteria to elute the protein(LUSH) bounded product methanol which is one of the precursors of biofuel. In our modified bacteria, the death of cells occurs by temperature dependent cell lysis device. The expression of this device takes place at 42 C since there is an RNA thermometer part in upstream of this device. At the downstream of this device there is an lysis casette. When transcription initiated at 42C holin and endolysin is expressed from this device and make cell dead.

ii) Background

This composite part consists of promoter, RNA thermometer, GFP and lysis casette. The upstream part of this composite is T7 promoter (BBa_I712074) which is strong promoter from T7 bacteriophage. For strong transcription T7 promoter expression system is chosen. In downstream of promoter there is RNA thermometer(ROSE) coding region which determines the transcription of our lysis composite part. RNA thermometer (BBa_K115001) is temperature sensitive that at 42C translation initiates. That means, up to 42 C RNA thermometer is in dimer form and at 42C it becomes linear. In downstream of RNA thermometer, green fluorescence protein(BBa_E0040) is ligated. This ligation is done to measure expression level and to comment on RNA thermometer efficiency. The last ligate to this composite is bacteriophage 21 lysis casette (BBa_K124003). This lysis casette induces lysis in E.coli. This gene cassette consists of the S protein (Holin), R protein (Endolysin), and Rz protein. When translation initiates at 42 C then the following coding gene begins to produce the proteins which lyse the cell.

iii) Modelling

In MethanE.COLIc project, this composite is modelled to lyse and kill the bacteria when switched on at 42C. In experimental design, we ligated this composite without lysis casette (with promoter, ROSE and GFP) We planned two control groups. One is T7 promoter and GFP ligate, this is designed to measure expression level of T7 promoter by reading the GFP expression. The second control group is T7 promoter, ROSE and GFP ligate, this is designed to measure the expression level of T7 promoter with ROSE ligate at 37 C. The device experiment is done with T7 promoter ROSE and GFP ligate at 42 C in which the GFP expression is expected.

Contact

Fun & Learn

Flashmob!

In order to reach more people from several age groups, we have organized a flashmob activity which is related with our project -in molecular level-. (A flashmob is an activity done by a group of people who assemble suddenly in a public place, perform an unusual and sometimes seemingly pointless act for a brief time, then disperse, often for the purposes of entertainment, satire, artistic expression. Flashmob activities are organized via telecommunications, social media, or viral emails ).One of our group member who is also a member of Flashmob society in Ankara helped us for arrangements. We use flashmob activity in order to explain what our project is and to increase the public awareness about Synthetic Biology and especially about our project. Flashmob event took place at one of the biggest shopping malls in Ankara where people often strolled around. Afterwards, we had interviewed with people who watched our sketch and informed people about nearly limitless capabilities of synthetic biology. Indeed we prepared handouts that contains interesting statistical data about methane and its side effects, also information about iGEM and about our project.

Contact

Safety

Safety Questions

1. Would the materials used in your project and/or your final product pose:
a. Risks to the safety and health of team members or others in the lab?

1. While in cloning steps the most dangerous material that we used is ethidium bromide which is used in agarose gel electrophoresis. Ethidium bromide is a potential mutagen because it works by inserting itself between the two strands of double-stranded DNA. Since the amount of ethidium bromide kept in our lab is relatively small, it does not pose devastating effects.However it is a toxic chemical, when got in contact, it causes eye and skin irritation. To prevent the damages that we would be face with, we wraped it with aluminium and put in brown bottle and wore gloves while using.
2. While device training experiments we planned to use methane gas CH4 and methanol CH3OH. Methane is  inactive biologically and essentially nontoxic.Methane is not listed in the IARC, NTP or by OSHA as a carcinogen or potential carcinogen. When inhaled in high concentrations,  so as to exclude an adequate supply of  oxygen to the lungs causes dizziness, deeper breathing due to air hunger, possible  nausea and eventual unconsciousness. In case of protection, we adjusted the progressing the steps for methane in glove boxes in order to provide the respiratory protection. The ventilation is  supported by hood. However due to methane gas is potent for greenhouse effect for doing experiments, special hood system is designed that could be used which has its own gas container for storage of gases is used. Thus, emission of methane gas is controlled. Later on, filled gas container is taken by department of chemistry to empty with certain procedures. We arranged the conditions in department for possible experiments with methane gas. And protective gloves and goggles are equiped for personal safety.Out of the experiments for storage the gas tanks were saved in area where is cool enough and never used open flames.

REFERENCE:http://www.isocinfo.com/DocumentRoot/13/Methane.pdf
For the steps with methanol the characterization tests for LUSH protein, methanol is        used. Methanol is hazardous in case of skin contact, eye contact, ingestion and inhalation. It is flammable liquid.The safety for this chemical is provided by experimenting in hood with high ventilation and and so much exposed because it pose a health risk to anyone in lab.
REFERENCE :http://www.sciencelab.com/msds.php?msdsId=9927227

We had studied with ANS; 1-Anilino-8-Naphthalene Sulfonate as protein conformational tightening agent for LUSH protein folding experiments. We searched on safety of this chemical and we found that it is non hazardous chemical according to Directive 67/548/EE Following reference belongs to Sigma Aldrich MSDS report.
http://www.sigmaaldrich.com/catalog/DisplayMSDSContent.do

b. Risks to the safety and health of the general public if released by design or accident?

1. The materials  mentioned in part a. could potentially be dangerous to the general public. We use just enough concentration for our experiments. We always check the amount both for methane and methanol and EtBr, because if accidentally released,
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