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| - | <td width=" | + | <td width="521" nowrap="nowrap" bgcolor="#03438A"><img src="https://static.igem.org/mediawiki/igem.org/2/28/Logonew2.jpg" width="473" height="120" /></td> |
| - | <td width=" | + | <td width="442" height="54" valign="bottom" nowrap="nowrap" bgcolor="#03438A" id="logo"><img src="https://static.igem.org/mediawiki/2008/f/fc/Logonew1.jpg" width="340" height="120" /><a href="https://2008.igem.org/Team:Tianjin" class="STYLE1"><span class="STYLE3">Home</span></a></td> |
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| - | <td height="4701" colspan="2" valign="top" bgcolor="#03438A"><table width=" | + | <td height="4701" colspan="2" valign="top" bgcolor="#03438A"><table width="971" height="1268" border="0" align="center" cellpadding="2" cellspacing="0"> |
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| - | <td colspan="2" bgcolor="#03438A" class="subHeader"><div align="center" class="STYLE16" style="margin-bottom: 0"> | + | <td height="124" colspan="2" bgcolor="#03438A" class="subHeader"><div align="center" class="STYLE16" style="margin-bottom: 0"> |
| - | <p> | + | <p><strong>PROJECT 1 </strong></p> |
| - | <p> | + | <p class="STYLE26">Foolproof Plasmid Self-Assembly system</p> |
</div> </td> | </div> </td> | ||
</tr> | </tr> | ||
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| - | <td | + | <td colspan="2" bgcolor="#03438A" class="subHeader STYLE4"><p class="STYLE29"><strong>Objectives</strong>: </p> |
| - | + | <p class="STYLE7">Bacterial assembly is aimed to be achieved based on the mechanism of site-specific recombination systems, So that the expensive reagent as well as the laboring tasks could be saved in gene cloning experiments.</p></td> | |
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| - | <td | + | <td width="536" height="46" bgcolor="#03438A" class=" STYLE13"><p class="STYLE7">Our design</p> |
| - | + | <p class="STYLE7">We have innovatively utilized the site-specific systems to build a foolproof bacterial assembly system to future reduce the labor and cost involved in gene cloning experiments. We have designed three standardized vectors which perform as the donors, receptor vector respectively.</p> | |
| - | + | <table width="536" height="43" border="0"> | |
| - | + | <tr> | |
| - | + | <td width="954" height="39" bgcolor="#03438A"><span class="STYLE16" style="margin-bottom: 0"><strong><a href="https://2008.igem.org/B11111">Background</a></strong></span></td> | |
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| - | + | <p align="left"><a href="http://partsregistry.org/cgi/partsdb/pgroup.cgi?pgroup=iGEM2008&group=Tianjin">Parts contributed to the registry</a><br> | |
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<td height="46" bgcolor="#03438A" class=" STYLE13"><img name="" src="https://static.igem.org/mediawiki/2008/4/45/Zong.gif" width="350" height="350" alt=""></td> | <td height="46" bgcolor="#03438A" class=" STYLE13"><img name="" src="https://static.igem.org/mediawiki/2008/4/45/Zong.gif" width="350" height="350" alt=""></td> | ||
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| - | <td | + | <td colspan="2" align="left" bgcolor="#03438A" class="subHeader"><p align="center" class="STYLE15"><span class="STYLE31">How do they work? </span></p> |
| - | + | <p class="STYLE15"><br /> | |
| - | + | <span class="STYLE1">First, we define the Receptor as the vector that has already existed in the cell (E.coli.), and the Donor as the vector containing the desired gene that we intend to integrate into the Receptor. The gene circuits for these plasmids are illustrated below.</span></p> | |
| - | + | <p class="STYLE1">When the Donor vector carrying the gene of interest GENE1 was introduced to the E Coli which contains the Receptor vector, the site-specific recombination will occur between the <em>attB1</em> site and the <em>attP1</em> site, so that the two sequences will be integrated into one circular DNA.</p> | |
| - | + | <p class="STYLE1">The recombinant DNA then could be selected in the liquid culture containing both ampicillin and kanamycin. Then, under inducible conditions, Cre will be expressed and the recombined sequence will be divided into two separate plasmids; one will retain the desired gene 1, while the other will preserve the killer gene ccdB, which is under the control of another inducible promoter. Because the two plasmids have shared origin site, plasmid incompatibility will occur thus the two kinds of plasmids will be separated into different cells. </p> | |
| - | + | <p class="STYLE1">When induced, the expressed CCDB will lead to the Programed Cell Death (PCD). </p> | |
| - | + | <p class="STYLE1">In order to realize the linkage of GENE 1 with GENE 2, we will introduce the new plasmid containing the desired GENE2 to the survival cells, in which the plasmids containing GENE 1 will behave as the new Receptor plasmid. Very similarly recombination between the <em>attB2 </em>and<em> attP2 </em>and the cleavage between the two <em>loxp </em> sites will be performed, and plasmids containing the linked GENE1 and GENE2 will be selected when the promoter expresses CCDB is induced. </p> | |
| - | + | <p class="STYLE1">The reason for us to use two sets of<em> attB/attP</em> specific sites is to avoid the combination within one module.</p> </td> | |
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| - | <table width=" | + | <table width="969" height="589" border="0" align="center"> |
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| - | <td | + | <td colspan="2" bgcolor="#03438A"><p align="center" class="STYLE16">The whole process</p> </td> |
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</tr> | </tr> | ||
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| - | <td bgcolor="#03438A"><table width=" | + | <td width="557" bgcolor="#FFFFFF"><p class="subHeader"><span class="STYLE1"><img src="https://static.igem.org/mediawiki/2008/2/21/%EF%BC%91%EF%BC%92%EF%BC%93%EF%BC%91%EF%BC%91%EF%BC%92.jpg" width="520" height="137"></span></p> |
| + | <p class="subHeader"><span class="STYLE1"><img src="https://static.igem.org/mediawiki/2008/f/f9/%EF%BC%91%EF%BC%92%EF%BC%93%EF%BC%94%EF%BC%95%EF%BC%96%EF%BC%97%EF%BC%98%EF%BC%99.jpg" width="523" height="132"></span></p></td> | ||
| + | <td width="402" bgcolor="#B9E5ED"><span class="subHeader"><span class="STYLE1"><span class="STYLE30">a</span><img src="https://static.igem.org/mediawiki/2008/4/4c/Where_have_we_been.gif" width="381" height="286" align="absmiddle"></span></span></td> | ||
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| + | <td colspan="2" bgcolor="#03438A"><table width="200" border="0" align="center"> | ||
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| - | <td bgcolor="#0000FF"><span class=" | + | <td colspan="2" bgcolor="#0000FF"><span class="STYLE36">a</span></td> |
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| - | <table width=" | + | <table width="967" height="1108" border="0" align="center" cellpadding="2" cellspacing="0"> |
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| - | <td height="59" colspan="2" bgcolor="#03438A" class="subHeader"><p align="center" class="STYLE3" style="margin-bottom: 0"> | + | <td height="59" colspan="2" bgcolor="#03438A" class="subHeader"><p align="center" class="STYLE3" style="margin-bottom: 0">PROJECT 2 </p> |
| + | <p align="center" class="STYLE3"> Synthetic convertible ecosystem</p></td> | ||
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| - | <td height=" | + | <td height="141" colspan="2" bgcolor="#03438A" class="subHeader STYLE5"><p class="STYLE25"><br /> |
| - | + | <span class="STYLE20">There is no mono-culture in nature! And in industry, coculture of species/strains are widely used to either improve productivity or lower the cost. The manufacturing of Vitamin C in China, which has contributed to 60 percent of its world production, could serve as an excellent example to validate the significance of coculture in industry. Thus to understand the interactions between coexistent ecosystems will not only contribute to human’s perception of nature but also to human practices in engineering.</span></p> </td> | |
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| - | <td | + | <td width="419" height="250" rowspan="2" align="center" bgcolor="#03438A" class="subHeader"><table width="418" border="0"> |
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| - | <td | + | <td><img src="https://static.igem.org/mediawiki/2008/b/b9/Hounan.jpg" width="410" height="321"></td> |
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| - | <td | + | <td><img src="https://static.igem.org/mediawiki/2008/9/9e/Hounasna.jpg" width="410" height="336"></td> |
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| - | <td>< | + | <td height="80" bgcolor="#03438A"><p class="STYLE25"><span class="STYLE28"><a href="https://2008.igem.org/B22222">Background</a></span></p> |
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| - | </table | + | <td width="528" height="41" bgcolor="#03438A" class="sidebarHeader STYLE5 STYLE4 STYLE12">Our Design </td> |
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| - | <td height="821" valign="top" bgcolor="#03438A" class="bodyText STYLE5 STYLE4 STYLE10"><p>The design for the cell | + | <td height="821" valign="top" bgcolor="#03438A" class="bodyText STYLE5 STYLE4 STYLE10"><p>The design for the cell 1: The genetic circuit can be divided into three different functional sections. <br> |
The first one in the graph is the detecting Section. By using this section you can detect the cell density according to the intensity of the red fluorescence. The detecting section is especially useful when you incubate two different kinds of E.coli in a coculture.</p> | The first one in the graph is the detecting Section. By using this section you can detect the cell density according to the intensity of the red fluorescence. The detecting section is especially useful when you incubate two different kinds of E.coli in a coculture.</p> | ||
| - | <p>The second | + | <p>The second one is the Helper section. We call it helper section because the LuxR protein is the prerequisite for the activation of PLux. Here we used a constitutive promoter to regulate the expression of the LuxR protein. </p> |
| - | <p>The core section is the | + | <p>The core section is the convertible switch. Convertible switch is a genetic device that can switch between two convertible states, which, here, represents a different survival strategy for the cells each. </p> |
| - | <p>When adding | + | <p>When adding Arabinose/AHL different genes will get expressed behind the two mutually-repressive promoters. That means when added into the culture, AHL will diffuse into the cell bind the LuxR protein and form a complex which can activate the LuxPr promoter and then the genes of rhII capR and araC will express. Then the AraC protein will bind to the PBad/araC promoter and repress the expression of the aiiA and another capR gene. However, you can turn the switch to the other side by adding Arobinose. When adding Arobinose into the culture, the repression functional molecular AraC protein will get released from the PBad/AraC promoter. With the expression of the aiiA gene the signal molecular will get digested and therefore decrease to a proper level which is not high enough to activate the LuxPr promoter.<br> |
| - | The most important thing in this section is the capacity of the two different promoters | + | The most important thing in this section is the capacity of the two different promoters luxPr and PBad/araC are quite different. When the luxRr promoter is activated, its higher capacity will express more chloromycetin resistant protein and another important thing is by sensing the AHL which is sent out by cell 2 it can produce another kind of signal molecular BHL.<br> |
| - | + | Cell 2 is similarly designed as Cell 1</p> | |
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| - | + | <table width="971" height="168" border="0"> | |
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| - | <td><p class=" | + | <td colspan="2" bgcolor="#03438A"><p><strong><span class="STYLE7">Mutualism and </span></strong><span class="STYLE1">Competition</span></p></td> |
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| - | <td><p class=" | + | <td width="556" height="50" bgcolor="#03438A"><span class="STYLE7"><strong>Competition</strong></span></td> |
| - | + | <td width="408" rowspan="2" bgcolor="#03438A"><p class="STYLE15">In the culture that both ampicillin and chloromycetin are available, it requires the expression of the both resistant genes for both antibiotics for a strain’s survival. Without adding any signal molecular as the initially inducing factor into the culture, the two kinds of E.coli can not communicate with each other so they will keep on the competitive stage. In this stage each kind of cell must survive all by it self in some method as assimilating the nutrition in the culture. As a result the two different kinds of E.coli fight with each other for the space and nutrient ingredient. </p> | |
| - | + | <p class="STYLE15">By adding some AHL into the culture, the luxPr promoter will get activated by the AHL and LuxR complex. And then the expression product of the rhlI gene, BHL will diffuse into the cell 2 which can sense BHL-RhIR complex by binding to the PrhI promoter and turning on the expression of luxI kanR and lacI genes. The LacI protein will bind to the PBad/araC promoter and therefore stop the digestion of the signal molecular by the expression of the aiiA gene. At the same time the expression of the luxI gene will send out AHL. By using a very similar mechanism the cell 1 can sense the AHL molecular.</p></td> | |
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| - | <td><p class="STYLE19"><strong>Mutualism</strong> < | + | <td bgcolor="#03438A"><p class="STYLE19"><span class="STYLE12"><strong>Mutualism</strong></span> </p> |
| - | In this state the two kinds of cells communicate with each other by sensing the signal molecular sent by the counterpart.<br> | + | <p class="STYLE19"><br> |
| - | + | In this state the two kinds of cells communicate with each other by sensing the signal molecular sent by the counterpart.<br> | |
| + | It seems that with the help of each other, both of them can live better in the harsh environment and the fact is the capacity of the LuxPr and PrhI are higher than that of the Plac and Pbad/araC promoters. With higher expression of the ampicillin and chloromycetin resistant protein both of them can survive in the ultra-high antibiotic concentration. </p></td> | ||
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<table width="556" height="433" border="0" align="center"> | <table width="556" height="433" border="0" align="center"> | ||
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| - | <p><span class=" | + | <p><span class="STYLE25" style="margin-bottom: 0">This idea was inspired by the theory of Prisoner’s Dilemma. |
| - | + | As in prisoners’ dilemma, the bacteria in our design are faced with two solutions for coexistence, they could either choose to cooperate with each other by providing inducers to express their partners’ antibiotics-resistance genes or they could take a foe strategy in which no cooperation is needed for both strains’ survival.</span></p> | |
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| - | <td colspan="2" bgcolor="#03438A"><table width=" | + | <td colspan="2" bgcolor="#03438A"><table width="973" border="0"> |
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| - | <td width=" | + | <td width="477" bgcolor="#03438A"><div align="center"><span class="STYLE17"><a href="https://2008.igem.org/Experiment">Experiment</a></span> </div></td> |
| - | <td width=" | + | <td width="493" height="80" bgcolor="#03438A"><div align="center"><a href="https://2008.igem.org/Model" class="STYLE18">Model</a></div></td> |
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| - | + | </table></td> | |
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Latest revision as of 05:11, 30 October 2008
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This idea was inspired by the theory of Prisoner’s Dilemma. As in prisoners’ dilemma, the bacteria in our design are faced with two solutions for coexistence, they could either choose to cooperate with each other by providing inducers to express their partners’ antibiotics-resistance genes or they could take a foe strategy in which no cooperation is needed for both strains’ survival. |
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