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Team:NTNU Trondheim/Protocols
From 2011.igem.org
Protocols
Resuspending DNA from registry-parts:
- Poke a hole in foil of corresponding well
- Resuspend DNA in 10 µL dH2O (pipette up and down a few times)
- Wait 5 minutes.
- Transfer the resuspended DNA to pCR tube and store in -20C.
Transforming competent cells:
- Thaw competent cells on ice
- Mix with 2 µL plasmid DNA
- Incubate on ice 30 minutes
- Heat-shock cells 45 seconds in 42C water-bath.
- Incubate 5 minutes on ice
- Add 200 µL SOC
- Incubate the Eppendorf tubes in Erlenmeyer flask 37C shaking incubator for 2 hours
- Plate 50 µl and 200 µl of the transformation onto the dishes, and spread.
- Incubate ON in 37C
Isolating plasmids:
- Inoculate one colony in 3 mL LB with appropriate antibiotic. (IE 1,5µL amp stock in 3 mL LB)
- Grow in shaking incubator 30C ON
- Isolate plasmid using [http://www.ebiotrade.com/buyf/productsf/Promega/tb225.pdf SV Miniprep procedure]
- Store in -20C
Gel Extraction:
- Using QIAquick Gel Extraction Kit [http://molecool.wustl.edu/krolllab/Kroll_Lab_Protocols/Molecular%20Biology%20protocols/Cloning%20protocols%20folder/Gel%20extraction-Qiagen.pdf protocol]
- eluating with dH20
Restriction Digest:
- Add 500ng of DNA to be digested, and adjust with dH20 for a total volume of 42.5ul.
- Add 5ul of NEBuffer 2 to the tube.
- Add 0.5µl of BSA to the tube.
- Add 1µl of your first enzyme.
- Add 1µl of your second enzyme.
- There should be a total volume of 50ul. Mix well and spin down.
- Incubate the restriction digest at 37C for 30min, and then 80C for 20min to heat kill the enzymes.
Ligation:
- After digestion, separation, purification.
- Add 11ul of dH20
- Add 2ul from each sample you will be ligating (destination plasmid, and part)
- Add 2ul of T4 DNA Ligase Reaction Buffer
- Add 1ul of T4 DNA Ligase
- Mix well, and spin down.
- Incubate for 30min at 16C and 20min at 80C to heat kill.
- Use 2ul of ligation to transform into competent cells.
Alternatively:
- After gel extraction:
- Add 1 µL T4 DNA Ligase Reaction Buffer
- ca 6:1 molar ratio of insert to vector (~10ng vector)
- Add (8.5 - vector and insert volume)μl
- 0.5 μL T4 Ligase
Testing of construct
Test 1 Nullmedium:
- Inoculate in 5 mL ON
- Dillute 4 x 1:100 in LB, grow to OD 0,5
- Pellet, resuspend 2x in 0,9% NaCl, 37C, 2x in LB
- Grow 3 hrs?
Test 2 Amino acid deprived:
- Inoculate in 5 mL ON
- Dillute 4 x 1:100 in LB, grow to OD 0,5
- Pellet, resuspend 2x in no amino acid media, 37C, 2x in LB
- Grow 3 hrs?
Test 3 Temperature:
- Inoculate in 5 mL ON
- Dillute 6 x 1:100 in LB, grow to OD 0,5
- Pellet, resuspend in LB, Incubate 2 x 25C, 2 x 37C, 2x 40C ?
- Grow 3 hrs?
Recipes used in the lab
LB Broth
- Bacto-tryptone: 10 g/L
- Yeast extract: 5 g/L
- NaCl 5 g/L
Adjust pH to 7,4 with NaOH, autoclave.
LA
- Dissolve LB
- Add agar, 15 g/L
Adjust pH to 7,4 with NaOH, autoclave.
SOC:
- Bacto-tryptone: 20 g/L
- Yeast extract: 5 g/L
- NaCl 0,5 g/L
- 10 mL 250 mM KCl (25mM) → 0,186 g / 10mL H20
- 5 mL 2M MgCl2 (10mM) → 0,952 g / 5mL
Autoclave, cool, then add:
- 20 mL 1M sterile-filtered glucose (20mM)
Ampicillin-plates:
Use stock 200 mg/mL. → 100µg/mL in liquid agar. I.E. 250 µL stock in 500 mL agar. Add when cool enough to pour.
Spectinomycin-plates:
Use stock 100 mg/mL. → 100µg/mL in liquid agar. I.E. 500 µL stock in 500 mL agar. Add when cool enough to pour.
Ampicillin-IPTG plates:
Ampicillin 100 µg / mL (500 µL amp stock (200 mg/mL) in 500 mL agar) IPTG 0,1 mM ( 63,5 µL IPTG stock (0,8 M))
M9 minimal medium:
- 0.4% carbon source, Glucose: 40 g
- 2mM MgSO4 → 0,2407 g / L 120,37
- 0.1mM CaCl2 → 0,0111 g / L
- 12,8g Na2HPO4.7H2O
- 3 g KH2PO4
- 0,5 g NaCl
- 1 g NH4Cl
In sterile H2O → 1000 mL
pH 7,4 , 4 x 250mL erlenmeyer, autoclave
