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From 2011.igem.org

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<div><b>Nikki Kapp</b></div>
 
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<div>- Evidence suggests that several components found in most sunscreens are harmful to us and can be carcinogenic, also most sunscreens only protect against UV B (315-280 nm) and not UV A (<span class="Apple-style-span" style="border-collapse: collapse; font-family: sans-serif; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; color: rgb(0, 0, 0); ">315-400 nm)</span>.</div>
 
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<div>- These sunscreens use metal oxides (Zinc oxide) to absorb UV radiation, but the effects of absorbing these metals into your skin are not fully understood and are thought to lead to production of reactive oxygen species and could lead to melanomas rather than preventing them.&nbsp;</div>
 
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<div>- Scytonemin is a pigment found in cyanobacteria which protects them from UV radiation, absorbing&nbsp;<span class="Apple-style-span" style="font-family: sans-serif; color: rgb(0, 0, 0); ">325-425&nbsp;nm. Its synthesis requires three enzymes, SycA-C</span></div>
 
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<div><span class="Apple-style-span" style="font-family: sans-serif; color: rgb(0, 0, 0); ">(http://www.int-res.com/articles/meps/158/m158p283.pdf)</span></div>
 
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http://upload.wikimedia.org/wikipedia/commons/thumb/3/30/Scytonemin_biosynthesis.png/800px-Scytonemin_biosynthesis.png<br>
 
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<div><span class="Apple-style-span" style="font-family: sans-serif; color: rgb(0, 0, 0); "><br>
 
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<div><span class="Apple-style-span" style="font-family: sans-serif; color: rgb(0, 0, 0); ">- M</span><span class="Apple-style-span" style="font-family: sans-serif; color: rgb(0, 0, 0); ">ycosporine-like amino acids (MAAs) are produced by organisms adapted to environments with high levels of sunlight (eg. cyanobacteria and algae), protecting them from UV radiation. There are 20 types and they also serve as anti-oxidants by stabilising free radicals (anti-ageing?).&nbsp;</span><span class="Apple-style-span" style="font-family: arial, verdana, helvetica, sans-serif; font-size: 12px; line-height: 18px; color: rgb(0, 0, 0); ">&nbsp;In a bioinformatics study the genes YP_324358 (predicted DHQ synthase) and YP_324357 (O-methyltransferase) were identified in&nbsp;<i style="box-sizing: border-box; ">A. variabilis</i>&nbsp;PCC 7937 cyanobacteria. (http://www.sciencedirect.com/science/article/pii/S0888754309002353)</span></div>
 
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<p>Nina Jiayue Zhu</b></p>
 
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<p></b></p>
 
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<p><p><p><p><p><p><p><p><p><p><p><p><p><p><p><p><p><p><p><p><p><p><p><p><p><p><p><p><p><p><p><p><p><p><p><p><p><p><p><p>http://ethesys.nuk.edu.tw/ETD-db/ETD-search-c/view_etd?URN=etd-0825110-170246</a></p>
 
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<b>Frank Machin<br>
 
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<br>
 
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</b>- First, I began to look into the possible production of the alkaloid isorhy, as was brought to my attention by Nina and Si<br>
 
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- It is rumoured to be a potential treatment for Parkinson's and it would make a good project if this were to be produced by bacteria<br>
 
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- On further research it turns out that the evidence for this drug as a treatment is weak and there is no information available about the gene or genes that encode it, so the idea was dropped<br>
 
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- After being inspired by a student from the Royal College of Arts who presented us with her work on a project to create a living dress, I began to research the notion of a melanin tattoo, so that alpha-melanin stimulating hormone is applied to the skin and held in place until the skin darkens in the shape of the template. The alpha-MSH could be produced by bacteria.<br>
 
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- the alpha-MSH gene is produced as one gene that also contains beta-MSH and gamma-MSH that are made available through post-transcriptional processing, so only the alpha-MSH region is required as it is the best characterised and has been expressed before<br>
 
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- Once the alpha-MSH is expressed, it can be collected, soaked into silk (for example) that is cut into a pattern and will allow the hormone to diffuse into the skin, producing a (probably temporary) tattoo.<br> From: http://en.wikipedia.org/wiki/Melanocyte-stimulating_hormone
 
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- However, it seems that alpha-MSH is a rather powerful aphrodisiac and so a different hormone will have to be chosen, in addition, it seems that the hormone is unlikely to penetrate the skin as there are many different layers as well as proteases secreted by the skin
 
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- alpha-MSH, or its analogues are already used as tanning solutions and the analogues are considerably stronger
 
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- so then, bacteria could express the gene for melanotan - which is a cyclic lactyam analogue, and this will be very difficult to express, as a method will have to be found for cyclisation.
 
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- One further problem:
 
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"As of 2010 no compound incorporating the melanotan II peptide has ever been approved for use by any governmental drug regulatory bodies outside of clinical trials. Unlicensed and untested powders sold as "melanotan II" are found on the Internet and are reported to be used by thousands of members of the general public. Multiple regulatory bodies have warned consumers the peptides may be unsafe and ineffective in usage with one regulatory agency warning that consumers who purchase any product labeled "melanotan" risk buying a counterfeit drug. Medical researchers and Clinuvel Pharmaceuticals, the company developing the related peptide afamelanotide, has warned consumers that counterfeit products sold using the names "melanotan I and II", "pose a hazard to public health"." From http://en.wikipedia.org/wiki/Melanotan
 
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- alpha-MSH will have to be used, but this time with the novel method for crossing the skin: Transdermal iontophoresis. This is a non-invasive way for hydrophilic proteins to be transported across the skin but I do not know what kind of resolution is possible with this device. Whatever the pattern achieved, be it a nice dot or a blotted smudge, the students from the RCA will surely help to make it look pretty.
 
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We had a briefing today chaired by James. Key action points of the day were to organize our CIDs, organize who was in charge of each team aspect and discuss the problems that we thought could be solved by Synthetic Biology. Once these problems had been discussed, we each chose one project that another team member came up with to research. We also were introduced to Professor Freemont and Professor Kitney who gave us an insightful talk about what awaits us. A trip to the Royal Society of Science exhibition ended up turning into a lunch in China town (the exhibition actually starts tomorrow) and we talked to Nicola Morgan who is interested in investigating the use of bacteria in making patterns on clothing.<br>
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<p class="MsoNormal"><b>Christopher Schoene</b><br>
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(Text by Chris)
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<p class="MsoNormal">We had a briefing today chaired by James. Key action points of the day were to organize our CID's, organize who was in charge of each team aspect and discuss the problems that we thought could be solved by Synthetic Biology. Once these problems had been discussed, we each chose one project that another team member came up with to research. We also were introduced to Professor Freemont and Professor Kitney who gave us an insightful talk about what awaits us. A trip to the Royal Society of Science exhibition ended up turning into a lunch in China town (the exhibition actually starts tomorrow) and we talked to Nicola Morgan who is interested in investigating the use of bacteria in making patterns on clothing.<br>
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<p class="MsoNormal">Vampiric bacteria:<br>
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<p class="MsoNormal">The aspect of a Vampiric bacteria that is designed to get
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rid of blood clots produced by trauma induced clotting or during complex
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medical procedures is intriguing. Expression of Hirudin is possible in systems
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such as E. coli. In 2007 Berkeley produced a chassis for a E. coli that could
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be introduced into the blood stream after inactivation. However, it is
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difficult to have the non-viable cell lysis occur in the correct location and
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therefore an anticoagulant could just as well be injected into the patient. For
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this to work, we would require an expression system that is able to express
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Hirudin (produced usually by leech salivary glands and has been successfully
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expressed in E. coli), express anti-angiotensin (it is possible to express Fab fragments in E. coli) and targeting the fibrin (can be done by expressing Tissue plasminogen activator). The idea would be to have the chassis recognize a blood clot or an area of damage and prevent clotting and/or clear clots. A method for having the system recognize when to secrete hirudin would be by having the bacteria sense trauma related chemokines and have the chassis secrete the protein only when it senses above a certain threshold of these chemokines or we could try to express protease-activated receptors (GPCR) that are cleaved by activated thrombin (the target of hirudin). Direct application would only benefit over the use of leeches in that the chassis is more aseptic then a leech bite.</p>
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<p class="MsoNormal"><span style="mso-spacerun:yes"> </span>The biggest issue remains the fact that for this to work we would have to inject the patient with living E. coli that can evade the human immune system.
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A new method of boosting biosynthesis has been obtained through the use of RNA scaffolds:
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http://www.sciencemag.org/content/early/2011/06/22/science.1206938<br>
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'''Yuanwei Li'''
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'''Fuel from food waste'''
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Microbes in food waste like heterotrophs, cyanobacteria, microalgae and purple bacteria produce '''biohydrogen'''. Hydrogen has more potential energy than petrol. Hence, food waste can be turned into valuable energy. '''Fermentative bacteria''' use carbohydrates like sugar to produce hydrogen and acids. '''Purple bacteria''', use light to produce energy (photosynthesis) and make hydrogen to help them break down molecules such as acids.
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http://www.sciencedaily.com/releases/2008/07/080716204805.htm
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Hydrogen is produced by feeding waste products from a chocolate factory to '''Escherichia coli''' bacteria. E Coli ferment the sugars in the chocolate waste, which generated organic acids so toxic to the bacteria that they began converting formic acid to hydrogen.
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http://environment.about.com/od/renewableenergy/a/chocolatefuel.htm
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'''Cellulose''' waste can be converted to energy by using enzyme '''cellulase'''. The gene that codes for cellulase has been isolated and grown in large quantities by E. coli.
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A number of photosynthetic bacteria, nonphotosynthetic bacteria, cyanobacteria, and green, red, and brown algae produced the enzyme '''hydrogenase''', which is necessary to make hydrogen.
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http://www.accessexcellence.org/RC/AB/BA/Future_Fuel.php
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'''Feather-Eating Bacteria'''
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'''Bacillus licheniformis''' Strain PWD-1 breaks down feather into a feather-lysate compound. Feather-lysate provides a low-cost, highly digestible protein source for livestock feed. Bacillus has also been shown to secrete a '''keratinase''' enzyme that hydrolyzes proteins such as collagen, elastin, and keratin. Potential application in breakdown of livestock carcasses. The gene encoding the enzyme keratinase of Bacillus licheniformis is '''kerA'''.
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http://www.accessexcellence.org/RC/AB/BA/The_Smell_of_Wealth.php
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http://aem.asm.org/cgi/content/abstract/61/4/1469
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<b><br><br>Nicolas Kral
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<br></b>
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<b>problem</b>: How to make C3 plant operating in sunny and arid areas or how to reduce photorespiration<br>
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<b>solution</b>: Create a bacteria which penetrates plant cells, creates high concentration of HCO<sub>3</sub><sup>−</sup> and packages it into vesicles, inactive Carbonic anhydrase is&nbsp; added to the vesicles, releases vesicles with chloroplast localisation signal, releases&nbsp; vesicles into the chloroplast, upon fusion CA is activated and changes </span></font><span style="color: rgb(0, 0, 0);">HCO</span><sub style="color: rgb(0, 0, 0);">3</sub><sup style="color: rgb(0, 0, 0);">−&nbsp; </sup><font style="color: rgb(0, 0, 0);" size="3"><span style="font-family: Calibri;">into carbon dioxide, which is then highly concentrated in a chloroplast and reduces rate of </span></font><span style="color: rgb(0, 0, 0);">O</span><sub style="color: rgb(0, 0, 0);">2</sub><span style="color: rgb(0, 0, 0);"></span><font style="color: rgb(0, 0, 0);" size="3"><span style="font-family: Calibri;"> binding to the Rubisco simply by increasing concentration of </span></font><span style="color: rgb(0, 0, 0);">CO</span><sub style="color: rgb(0, 0, 0);">2</sub><font style="color: rgb(0, 0, 0);" size="3"><span style="font-family: Calibri;">.<br>
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Chassis: E.coli or Sinorhizobium meliloti<br>
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<br>
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Bacterial infection: Nod factors<br>
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Bacteria of Rhizobium spp. are capable of infecting a plant and forcing it to develop an extra organ - Nodule, where these bacteria then intracellularly (a bit like organelles) reside. They do this to develop a mutualistic relationship with plant. We could use this mechanism of infection and acceptance by using the entire "Nod box" a cluster of genes involved in signalling to the plant to allow entry through the specially deformed root (induced by the Nod factors) or by crack entry. Each of the two mechanisms involves plant release of the flavonoids in the first place to trigger the Nod factors in the first place.<br>
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<br></html>
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[[File:Rhizobium.gif]]<html><br>
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<br>
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</span></font><br>
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</div>
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<div style="text-align: left;"><font style="color: rgb(0, 0, 0);" size="3"><span style="font-family: Calibri;">problems: <br>
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<ul><li><font style="color: rgb(0, 0, 0);" size="3"><span style="font-family: Calibri;">A lot of plants do not have Nod factor receptors, as wild type Rhizobium infects only legumes, so we would have been restricted to legumes as well. Also there is specificity among different Nod factors and their receptors on the plants meaning that not every Nod box containing bacteria could infect every plant. </span></font></li>
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<li><font style="color: rgb(0, 0, 0);" size="3"><span style="font-family: Calibri;">In theory inserting a whole "Nod box" of genes into E. coli should enable E.coli to function in relation to the plant much in the same way as Rhizobium does, however we can not be sure of that, even though there is evidence that some genes in Rhizobium (NodD) have orthologues in E. coli (glmS).</span></font></li>
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<li><font style="color: rgb(0, 0, 0);" size="3"><span style="font-family: Calibri;">Plant accepts Rhizobium as a symbiont and expects to get something from it, therefore if we were to use Rhizobium as chassis we could leave the initial nitrogenase function intact, however there might be a problem using E. coli as it would not be capable of fixing nitrogen the plant might not accept its infection thread.</span></font></li>
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<li><font style="color: rgb(0, 0, 0);" size="3"><span style="font-family: Calibri;">Rhizobium forces plant to form nodule on the root, however ideally we would want to set up infection into the leaves. Maybe possibility to send vesicles through the xylem to the leaves, however vesicles would face problem of crossing plant cell wall.</span></font></li></ul>
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<font color="#000000" size="3">Accumulation of </font><font style="color: rgb(0, 0, 0);" size="3"><span style="font-family: Calibri;"></span></font><font size="3"><span style="color: rgb(0, 0, 0);">HCO</span><sub style="color: rgb(0, 0, 0);">3</sub><sup style="color: rgb(0, 0, 0);">−</sup></font><font style="color: rgb(0, 0, 0);" size="3"><span style="font-family: Calibri;"> and packaging into the vesicles: CaA and carboxysome <br>
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A lot of cyanobacteria / algae, use specialised carboxysomes to accumulate </span></font><font size="3"><span style="color: rgb(0, 0, 0);">HCO</span><sub style="color: rgb(0, 0, 0);">3</sub><sup style="color: rgb(0, 0, 0);">−</sup></font><font style="color: rgb(0, 0, 0);" size="3"><span style="font-family: Calibri;"> through a number of </span></font><font size="3"><span style="color: rgb(0, 0, 0);">HCO</span><sub style="color: rgb(0, 0, 0);">3</sub><sup style="color: rgb(0, 0, 0);">−</sup></font><font style="color: rgb(0, 0, 0);" size="3"><span style="font-family: Calibri;"> transporters and carbon dioxide converting enzyme Carbonic anhydrase which performs interconversion of CO2 and </span></font><font size="3"><span style="color: rgb(0, 0, 0);">HCO</span><sub style="color: rgb(0, 0, 0);">3</sub><sup style="color: rgb(0, 0, 0);">−</sup></font><font style="color: rgb(0, 0, 0);" size="3"><span style="font-family: Calibri;">. Different genes in C. reinhardtii (cupA, cupB) act as transporters of CO2 and automatically convert it to </span></font><font size="3"><span style="color: rgb(0, 0, 0);">HCO</span><sub style="color: rgb(0, 0, 0);">3</sub><sup style="color: rgb(0, 0, 0);">− </sup></font><font style="color: rgb(0, 0, 0);" size="3"><span style="font-family: Calibri;">. There is a number of other transporters</span></font> <font color="#000000">utilised by cyanobacteria, but these just transport </font><font size="3"><span style="color: rgb(0, 0, 0);">HCO</span><sub style="color: rgb(0, 0, 0);">3</sub><sup style="color: rgb(0, 0, 0);">−</sup></font><font style="color: rgb(0, 0, 0);" size="3"><span style="font-family: Calibri;"></span></font><br>
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<font style="color: rgb(0, 0, 0);" size="3"><span style="font-family: Calibri;">and do not convert it to CO2, and therefore are not useful to us. Then a number of genes involved in carboxysome production would have to be included in the chassis as well. Also normal carboxysome in a cyanobacterium contains a number of other protein products to convert CO2, however these are not necessary as carbon fixation would be performed by the plant itself. Finally a CaA - carbonic anhydrase converting </span></font><span style="color: rgb(0, 0, 0);">HCO</span><sub style="color: rgb(0, 0, 0);">3</sub><sup style="color: rgb(0, 0, 0);">− </sup><font style="color: rgb(0, 0, 0);" size="3"><span style="font-family: Calibri;">to CO2 would be included, also Cso3 a Carbonic anhydrase embedded in the carboxysome membrane would be present.&nbsp; <br>
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[[File:carboxysome_pathway.jpg]]<html><br>
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However it needs to be inactive within the carboxysome/vesicle and active only upon entry into chloroplast. Therefore possible fusion protein with 3 domains could be created containing CA on the inner end, then transmembrane subunit and a transit/fusion peptide targeting it to the chloroplast. Upon fusion into chloroplast the fusion protein would be cleaved and CA would become active.<br>
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</span></font><br>
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<ul><li><font style="color: rgb(0, 0, 0);" size="3"><span style="font-family: Calibri;">Creation of carboxysome ( a whole "organelle") within a chassis not previously having any.</span></font></li>
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<li><font style="color: rgb(0, 0, 0);" size="3"><span style="font-family: Calibri;">Creating vesicles out of carboxysome, which would not release any of its content out into bacterial cytoplasm (whole compartmentalisation would not work)</span></font></li>
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<li><font style="color: rgb(0, 0, 0);" size="3"><span style="font-family: Calibri;">This also raises a question of what concentration of </span></font><font style="color: rgb(0, 0, 0);" size="3"><span style="font-family: Calibri;"> </span></font><font size="3"><span style="color: rgb(0, 0, 0);">HCO</span><sub style="color: rgb(0, 0, 0);">3</sub><sup style="color: rgb(0, 0, 0);">−</sup></font><font style="color: rgb(0, 0, 0);" size="3"><span style="font-family: Calibri;"> can be transported within one vesicle, if the concentration is too low it will not function.</span></font></li></ul>
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<font color="#000000"><font size="3">Transport of vesicles from bacteroid into the chloroplast: OMV<br>
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Could be largely based on the OMV-outer membrane transport, which has been worked out by igem team paris 2009. However a number of outer-transit/fusion peptides would have to be different to ensure targeting towards chloroplast and succesful fusion into the chloroplast</font></font><font color="#000000"><font size="3">.<br>
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problems:</font></font><font color="#000000"><font size="3"> <br>
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</font></font>
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<ul><li><font color="#000000"><font size="3">usual transit peptide used for fusion protein targeting from cytoplasm into chloroplast (5kDa Rubisco subunit) might not work in targeting of the wholve vesicle into the chloroplast.</font></font></li>
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<li><font color="#000000"><font size="3">previous igem team have developed OMV to transport proteins from cytoplasm to another bacteria. In this situation however we would use OMV to transport concentrated solution from carboxysome - "organelle", therefore the OMV itself might not work on our setup.</font></font></li></ul>
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<font size="4"><font color="#000000">Ideal solution: Engineer carboxysome with Carbonic anhydrase within plants (possibly within chloroplast) and use it to generate high CO2 concentration.</font></font><br>
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</div>
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<div style="text-align: left;"><font style="color: rgb(0, 0, 0);" size="3"><span style="font-family: Calibri;"></span></font><span style="color: rgb(0, 0, 0);"></span><font style="color: rgb(0, 0, 0);" size="3"><span style="font-family: Calibri;"></span></font></div>
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[[File:Example.jpg]]
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Si Chen
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Problem: Convert fallen leaves into useful products
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• Aquatic hyphomycetes has been recognized as critical for controlling the process of leaf litter breakdown.
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• The activity of this fungi is affected by
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1. C:N ratio
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2. Lignin content
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3. pH of water, temperature, abundance of nutrient (i.e. O2)
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• They produce B-glucosidase (bgaf2), Cellobiohyhrolase (cbhI family), B-xylosidase (xlnR)and phenoloxidase (Pox2) to promote leaves degradation.
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• As leaves decay, they produce heat. And leaves will decompose into an excellent organic soil amendment that can be used as a soil conditioner.
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• The decomposition process is slow (i.e. leaves require 5 months to 2 years to decompose), could combine with Nick’s gene expression amplification?
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• However, rapid decomposition would consume large amount of O2  and create anaerobic condition. Could we engineer all these into a anarobic bacteria like facultative
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anaerobes ?
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<b>Rebekka Bauer</b>
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- I first looked at biological synthesis of isorhy, which may be used to treat Parkinson's and IBS. I stopped looking at this due to the reasons outlined by Frank.
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Food fermentation (food waste conversion/increasing shelf life):
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- Thermoanaerobacterium thermosaccharolyticum can be used to convert food waste into hydrogen.PMID: 15727153
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and http://www.sciencedirect.com/science/article/pii/S0360319907007410
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<br>
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http://www.sciencedirect.com/science/article/pii/S0924224403002085
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<br>
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- Lactic acid bacteria can produce a compound that fights Staph aureus, increasing food safety PMID: 9709204
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Latest revision as of 15:28, 11 July 2011

We had a briefing today chaired by James. Key action points of the day were to organize our CIDs, organize who was in charge of each team aspect and discuss the problems that we thought could be solved by Synthetic Biology. Once these problems had been discussed, we each chose one project that another team member came up with to research. We also were introduced to Professor Freemont and Professor Kitney who gave us an insightful talk about what awaits us. A trip to the Royal Society of Science exhibition ended up turning into a lunch in China town (the exhibition actually starts tomorrow) and we talked to Nicola Morgan who is interested in investigating the use of bacteria in making patterns on clothing.
(Text by Chris)

Retrieved from "http://2011.igem.org/4"