Team:York/Cake

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            <h1>Hello! We're from the</h1>
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                        <a href="http://www.york.ac.uk/biology/" target="_blank"><img src="https://static.igem.org/mediawiki/2014/5/5e/Uoylogo-white.png" class="img-responsive center" style="max-width:600px; margin-top:30px; margin-bottom:30px; margin-left:auto; margin-right:auto;"></a>
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            <p>Our project EcoCADMUS (E. Coli CAdmium DecontaMination Universal System) targets industrial and mineral processing waste-water contamination by heavy metals and sulfates. EcoCADMUS provides a safe and selective way to remove Cadmium Sulfide from waste water using Synthetic Biology.
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<a href="https://twitter.com/iGEMyork" target="_blank"><i class="fa fa-twitter fa-lg"></i></a> &nbsp; &nbsp; &nbsp; <a href="mailto:igemyork2014@gmail.co.uk" target="_blank"><i class="fa fa-envelope fa-lg"></i></a>
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    <li class="active"><a href="#one" role="tab" data-toggle="tab">pYodA</a></li>
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    <li><a href="#two" role="tab" data-toggle="tab">NRAMP</a></li>
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    <li><a href="#three" role="tab" data-toggle="tab">CysP</a></li>
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<h2>pYodA</h2>
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<b>Name:</b> pYodA (ZinTp) <br>
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<b>Organism:</b> <i>Escherichia Coli</i> <br>
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<b>Normal Function:</b> pYodA is a cadmium-induced promoter that activates the yodA(zinT) gene, leading to the production of ZinT metal-binding protein.<br>
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<b>Aim:</b> We are using pYodA in an alternative way; to regulate the expression of the CysP gene (sulfate transporter) and the NRAMP gene (Cadmium transporter). Due to using pYodA, the expression of these two genes will be regulated by the concentration of Cadmium in the extracellular environment. The over-production of Cysteine will only occur when the concentration of Cadmium reaches the sensitivity threshold of pYodA. Due to cysteine production being both energetically demanding and toxic at high concentrations, we do not want these genes to be expressed constitutively. <br>
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<b>Characterisation:</b> In order to characterise pYodA, we will couple it with a GFP gene. This will allow us to calculate the sensitivity threshold of pYodA and measure the amount of cadmium that can be chelated at various concentrations. <br>
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<b>Literature:</b>
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<ol>
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<li>http://mic.sgmjournals.org/content/148/12/3801.long</li>
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<li>http://www.uniprot.org/uniprot/F4VWH2</li>
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<li>http://sbkb.org/uid/F4VWH2/uniprot#structures</li>
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<li>http://www.jbc.org/content/278/44/43728</li>
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<li>http://biocyc.org/ECOLI/NEW-IMAGE?type=GENE&object=G7061</li>
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<h2>NRAMP</h2>
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<b>Gene:</b> mntH<br>
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<b>Organism:</b> <i>Escherichia Coli</i><br>
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<b>Protein:</b> NRAMP<br>
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<b>Function:</b> NRAMP is a membrane divalent metal-ion transporter. In addition to iron and manganese, it also transports Cd ions into the cell.<br>
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<h3>Our Team</h3>
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<b>Aim:</b> We want to use the endogenous transporter NRAMP to take up the cadmium from the environment. The cadmium will then activate pYoda and set off the phytochelatin synthesis process.<br>
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<img class="img-responsive" src="https://static.igem.org/mediawiki/2014/4/44/York_TeamHomePage.jpg">
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<b>Expression:</b> We can run assays measuring the concentration of cadmium in the environment. If NRAMP is active, the concentration of cadmium should decrease.<br></p></div>
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<p>Come and meet our lovely team!<br>We've been working hard (mostly!) on our project all over Summer.</p>
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<h2>CysP</h2>
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<h3>Plasmid Construct</h3>
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<b>Gene:</b> cysP (AKA YlnA) <br>
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<b>Organism:</b> <i>Bacillus Subtilis</i> <br>
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<p>Look at the plasmid we're using in our project, complete with a repertoire of Cadmium related genes.</p>
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<b>Protein:</b> CysP <br>
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<b>Function:</b> This gene encodes for CysP, a sulfate/thiosulfate ABC transporter found in the periplasmic space. <br>
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<b>Aim:</b> We want to overexpress this gene in E.coli. This would lead to increased sulfate uptake, which could be used to produce cysteine and eventually phytochelatins that would bind cadmium. <br>
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<b>Expression:</b> We could run assays measuring the concentration of sulfate in the environment containing our bacteria. <br>
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<a href="https://2014.igem.org/Team:York/SocialImpacts">
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<p>We've been busy communicating Synthetic Biology and contemplating the sustainability and ethics of our project. </p>
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<h2>CysE*</h2>
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<b>Original Gene:</b> cysE<br>
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<b>Mutant Gene:</b> cysE*<br>
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<b>Organism:</b> <i>Escherichia Coli</i> <br>
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<b>Protein:</b> CysE(SAT)<br>
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<b>Normal function:</b> To catalyse the acetylation of L-serine (the first step in cysteine biosynthesis)<br>
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<b>Function:</b> Serine acetyltransferase (CysE) carries out the first step in cysteine biosynthesis; it  catalyses the acetylation of L-serine which generates O-acetyl-L-serine. Cysteine itself strongly inhibits the activity of serine acetyltransferase by binding to the serine-binding site. This inhibition depends on the protein's carboxy terminus, and has been localized to Met-256 specifically. Due to cysteine production being both energetically demanding and toxic at high concentrations, the cell does not want to produce cysteine constitutively.<br>
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<b>Aim:</b> To over-produce cysteine.To fulfill this aim, we need to remove negative feedback from cysteine biosynthesis. To do this, we are using a mutant CysE gene (CysE*). Our mutant CysE gene will produce a protein that has a single amino acid substitution: Met-256 will be replaced by Ile by changing the corresponding AUG codon to AUC. This single amino-acid substitution will alter the three dimensional shape of the serine-binding site in our acetyltransferase. Changing the shape of the serine-binding site prevents cysteine from binding to it. Thus, our acetyltransferase will not be inhibited by cysteine. As a result, we will be able to over-produce cysteine in our cell.<br>
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<b>Method:</b> We had the cysE* gene synthesised to produce the mutant CysE* protein.<br>
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<b>Literature:</b>  
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<ol>
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<li>http://aem.asm.org/content/66/10/4497.full</li>
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<li>Denk D., Bock A. <i>J. Gen. Microbiol</i>, 1987</li>
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<h2>Gsh1*</h2>
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<b>Original Gene:</b> gsh1/gshA<br>
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<b>Organism:</b> <i>Saccharomyces cerevisiae</i><br>
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<b>Protein:</b> Glutamate-Cysteine Ligase (previously known as gamma-glutamylcysteine synthetase)<br>
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<b>Function:</b> Gamma glutamylcysteine synthetase catalyzes the first step in glutathione (GSH) biosynthesis;<br>
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L-glutamate + L-cysteine + ATP -> gamma-glutamyl cysteine + ADP + Pi<br>
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Expression is induced by oxidants, cadmium, and mercury. Protein abundance increases in response to DNA replication stress.<br>
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<b>Aim:</b> We can use the overproduced cysteine to make gamma-glutamyl cysteine, which is the monomer that forms phytochelatins (n=10-20). In order to do this, we need glutamate-cysteine ligase to catalyse the reaction. We can overexpress GSH1* using the pYodA promoter. <br>
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<b>Literature:</b><ol><li>http://biocyc.org/YEAST/NEW-IMAGE?type=GENE-IN-MAP-IN-PWY&object=YJL101C</li></ol></p></div>
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<h2>spPCS</h2>
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<b>Gene:</b> spPCS<br>
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<b>Organism:</b> <i>Schizosaccharomyces pombe</i><br>
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<b>Function:</b> The phytochelatin synthase in S. pombe uses glutathione with a blocked thiol group  to synthesise phytochelatins.<br>
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<b>Aim:</b> Overexpression of this gene, together with Gsh1*, in E.coli has been shown to increase phytochelatin production and lead to a 7.5-times-higher Cd accumulation. We want to use this gene to make our bacteria more efficient in  taking up cadmium.<br>
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<b>Literature</b><ol><li>http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2075016/</li></ol></p></div>
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Revision as of 13:10, 17 October 2014

Team York 2014

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Hello! We're from the

Our project EcoCADMUS (E. Coli CAdmium DecontaMination Universal System) targets industrial and mineral processing waste-water contamination by heavy metals and sulfates. EcoCADMUS provides a safe and selective way to remove Cadmium Sulfide from waste water using Synthetic Biology.

     

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