Team:Berkeley Wetlab

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== Preliminary project description ==
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The University of California Berkeley iGem team is proposing to expand the design space of synthetic biology by exploring novel applications of cell surface display within Escherichia coli, the gold standard organism for bacterial engineering. The team envisions a bottom-up design scheme in order to tackle this engineering problem in a well organized, modular fashion. In order to overcome the challenges of engineering Escherichia coli cell surface display, a high throughput, automated, combinatorial strategy is employed to control the system.
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<big><font size="5" face="Book Antiqua"> Abstract</font> </big> <br>
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Cell surface display in ''E. coli'' tethers proteins to the outer membrane in order to localize them to the extracellular environment.  While this form of localization has allowed many novel functions to be engineered into ''E. coli'', work within this space relies on a trial and error approach rather than design principles. We worked to create a foundation of research which would make the rational design of cell surface display systems in ''E. coli''  possible.  We used a combinatorial approach to compare the ability of different display proteins to display different classes of functional proteins.  This required the development and implementation of an automated assembly method able to construct the large number of devices necessary to draw meaningful conclusions about design within this space.  
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<center><font size="5" face="Book Antiqua">Our Team</font></center> <br>
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<font size="5" face="Book Antiqua">Acknowledgements</font> <br>
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We thank our wonderful advisers: Chris Anderson, Terry Johnson, and Lane Weaver for their guidance and support. We also thank our generous sponsors:<br>
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<p><span id="Intro_Text">The necessity of inexpensive, disease-free, and universally compatible blood substitutes is undisputed. There are currently no blood substitutes approved for use in the US or the UK, and whole blood is almost always in short supply. Developing countries have the greatest need for blood transfusions, yet many lack the necessary donation and storage infrastructure and the required pool of healthy donors. To address this problem, we are developing a cost-effective red blood cell substitute constructed from engineered <i>E. coli</i> bacteria. Our system is designed to safely transport oxygen in the bloodstream without inducing sepsis, and to be stored for prolonged periods in a freeze-dried state.<br /><br /></span></p>
 
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<p><span id="Support_Text"><b><i>Support for Berkeley iGEM 2007 was generously provided by
 
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SynBERC and The Camille and Henry Dreyfus Foundation, Inc.</i></b>
 
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<h3>The System's Components</h3></td>
 
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<td class="tdboxes"><a href="http://parts.mit.edu/igem07/index.php/BerkiGEM2007Present1"><img border="0" src="http://parts.mit.edu/igem07/images/e/e5/Berk-Icon-Oxygen.png" width="121" height="121"></a></td>
 
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<td class="tddesc"><b><a href="http://parts.mit.edu/igem07/index.php/BerkiGEM2007Present1">Oxygen Transport</a></b><p><i>Our system is
 
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designed to produce Hemoglobin, Heme, and the necessary
 
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chaperones and detoxifying agents to promote the transport
 
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of oxygen throughout the bloodstream.&nbsp; We also
 
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investigated alternates to hemoglobin and other strategies
 
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for its production.</i></td>
 
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<a href="http://parts.mit.edu/igem07/index.php/BerkiGEM2007Present4"><img border="0" src="http://parts.mit.edu/igem07/images/b/ba/Berk-Icon-Chassis.png" width="121" height="121"></a></td>
 
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<td class="tddesc"><b><a href="http://parts.mit.edu/igem07/index.php/BerkiGEM2007Present4">The Chassis</a></b><p><i>Our bacterial
 
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chassis has been heavily modified to remove its
 
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sepsis-inducing toxicity, immunogenic factors, and ability to grow
 
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within the bloodstream, as well as promote its ability to last
 
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longer in the bloodstream by masking it from the immune
 
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system.</i></td>
 
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<a href="http://parts.mit.edu/igem07/index.php/BerkiGEM2007Present3"><img border="0" src="http://parts.mit.edu/igem07/images/8/8d/Berk-Icon-Controller.png" width="121" height="121"></a></td>
 
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<td class="tddesc"><b><a href="http://parts.mit.edu/igem07/index.php/BerkiGEM2007Present3">The Controller</a></b><p><i>The Controller
 
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is an integrated genetic circuit comprised of two plasmids that allows
 
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stable maintenance of the system's various operons on a large single-copy
 
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plasmid in a dormant state.  Upon induction, the copy number of the
 
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operons and their transcription increase 100-fold resulting in a
 
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dramatic increase in protein expression.</i></td>
 
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<a href="http://parts.mit.edu/igem07/index.php/BerkiGEM2007Present5"><img border="0" src="http://parts.mit.edu/igem07/images/c/c5/Berk-Icon-Self-Destruct.png" width="121" height="121"></a></td>
 
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<td class="tddesc"><b><a href="http://parts.mit.edu/igem07/index.php/BerkiGEM2007Present5">Genetic Self-Destruct</a></b><p><i>To
 
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prevent chance of infection or unwanted proliferation after
 
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hemoglobin production, we have engineered a genetic
 
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self-destruct mechanism whereby when induced, the bacterial
 
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cell will express a genetic material-degrading toxin which
 
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kills the cell, but leaves it physically intact.</i></td>
 
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<a href="http://parts.mit.edu/igem07/index.php/BerkiGEM2007Present2"><img border="0" src="http://parts.mit.edu/igem07/images/c/ce/Berk-Icon-Freeze-Drying.png" width="121" height="121"></a></td>
 
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<td class="tddesc"><b><a href="http://parts.mit.edu/igem07/index.php/BerkiGEM2007Present2">Freeze Drying</a></b><p><i>To
 
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we are including the ability to produce the compounds
 
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hydroxyectoine and trehalose that will enable our bacteria to
 
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<a href="/igem07/index.php/John_Dueber" title="John Dueber">
 
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John Dueber</a> <font face="Arial">•</font>
 
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<a href="http://www.openwetware.org/wiki/User:JCAnderson" title="http://www.openwetware.org/wiki/User:JCAnderson" rel="nofollow">
 
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Christopher Anderson</a> <font face="Arial">•</font>
 
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<a href="http://genomics.lbl.gov/" title="http://genomics.lbl.gov/" rel="nofollow">
 
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Adam Arkin</a> <font face="Arial">•</font>
 
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<a href="https://keaslinglab.lbl.gov/wiki/index.php/Main_Page" title="https://keaslinglab.lbl.gov/wiki/index.php/Main Page" rel="nofollow">
 
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Jay Keasling</a><br />
 
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<p><b>Teaching Assistants</b><br />
 
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<a href="/igem07/index.php/Farnaz_Nowroozi" title="Farnaz Nowroozi">
 
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Farnaz Nowroozi</a> <font face="Arial">•</font>
 
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<a href="/igem07/index.php/Amin_Hajimorad" title="Amin Hajimorad">
 
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Amin Hajimorad</a> <font face="Arial">•</font>
 
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Rickey Bonds</a><br /></p>
 
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Kate Spohr</a> <font face="Arial">•</font>
 
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Kevin Costa</a> <font face="Arial">•</font>
 
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<a href="/igem07/index.php/Gwyneth Terry" title="Gwyneth Terry">
 
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Gwyneth Terry</a><br /></p>
 
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<a href="/igem07/index.php/Arthur_Yu" title="Arthur Yu">
 
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Arthur Yu</a> <font face="Arial">•</font>
 
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Austin Day</a> <font face="Arial">•</font>
 
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David Tulga</a> <font face="Arial">•</font>
 
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Kristin Doan</a> <font face="Arial">•</font>
 
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Samantha Liang</a> <font face="Arial">•</font>
 
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<a href="/igem07/index.php/Vaibhavi_Umesh" title="Vaibhavi Umesh">
 
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Vaibhavi Umesh</a> <font face="Arial">•</font>
 
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Kristin Fuller</a><br /></p>
 
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Nhu Nguyen</a> <font face="Arial">•</font>
 
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<a href="/igem07/index.php/Hannah_Cole" title="Hannah Cole">
 
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Hannah Cole</a></p></td>
 
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Latest revision as of 19:14, 21 October 2009


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Abstract
Cell surface display in E. coli tethers proteins to the outer membrane in order to localize them to the extracellular environment. While this form of localization has allowed many novel functions to be engineered into E. coli, work within this space relies on a trial and error approach rather than design principles. We worked to create a foundation of research which would make the rational design of cell surface display systems in E. coli possible. We used a combinatorial approach to compare the ability of different display proteins to display different classes of functional proteins. This required the development and implementation of an automated assembly method able to construct the large number of devices necessary to draw meaningful conclusions about design within this space.




Our Team

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Acknowledgements
We thank our wonderful advisers: Chris Anderson, Terry Johnson, and Lane Weaver for their guidance and support. We also thank our generous sponsors:


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