Team:KAIST Korea

From 2013.igem.org

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Using the FlipFlop device, we can generate biological machine that controls the metabolism as we intended. We decided to call the system as "Auto-regulating system in E.coli", <span style="color:#aa0000;"><b>Reguli</b></span>. To demonstrate the idea, we applied the device to control bio-indigo production, which is catalyzed by bacterial flavin-containing monooxygenase(bFMO).</br>
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<span style="font-size:20px;font-weight:bold">What is bFMO?</span></br></br>
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Bacterial flavin-containing monooxygenase(bFMO) converts  indole into isatin, which is then sequentially catalyzed into indigoid compounds emitting indigo color.
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</br>Because the enzyme utilizes the primary metabolite, we can easily notice the enzyme is working well or not.  For the following experiments, engineered bFMO gene from Methylophaga sp. Strain SK1 is kindly provided by Duhee Bang from Yonsei University, Republic of Korea.
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<span style="font-size:20px;font-weight:bold">Working scheme of Our Design</span></br></br>
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<div align='right'><a href="#top">▲Back to the top</a></div></br>
<div align='right'><a href="#top">▲Back to the top</a></div></br>

Revision as of 12:22, 16 August 2013

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> Team:KAIST Korea/Project Background - 2013.igem.org

 

Team:KAIST Korea/Project Background

From 2012.igem.org

KAIST Korea 2013 iGEM

Project : Overview

Overview



What we see and handle in lab is mostly ‘microscopic’. But there are macroscopic stuffs out there! At night, we can see stars, and among them, we can find Lion’s heart, ‘Regulus’. Although it is not the brightest kind, Regulus still makes it easy to notice the Lion in the sky.

Like Regulus, we want our module to be helpful for others to find their own Lion in this universe of synthetic biology. Our module may not be magnificent as that of other teams but we don’t actually want to excel others. We rather want to facilitate the advance of synthetic biology. Like the heart which beats in autonomous manner, our module will run by itself. Regarding all these aspects, we call our project ‘Reguli’.

Why does Autoregulation so necessary?

When we bring external pathway into E.coli to mass-produce the protein, it may collide with E.coli’s innate pathways by consuming critical resources which generate the redox potential (ATP, NADH, or NADPH molecules). This means that E.coli has to reach certain reducing potential to perform exotic metabolic pathway in the cell.

In conventional methods, the promoters controlling protein expression are repressed until the cells get capacity to produce the protein. Then, this promoter can be induced by putting inducer to the solution on proper cell phase; cell phase can be measured by O.D. value. This kind of method was used because we assume that cell cultural Optical Density (which synchronizes with cell number in the culture) represents inner-cell reduction potential. Although in many time this method successfully makes cells to induce, there are several downsides in this method.

First of all, problem arises with the process of adding inducers like IPTG or arabinose into media. Because the induction time is decided only by considering cell density (O.D.value) not the capacity of the cells (reduction potential), products may not come out as we predicted. Also, it is an annoying job to measure optical density, finding optimal induction conditions. Even more, if we miss the right time point, we might have to throw them away and start from the first place...

This is why we came up with our auto-regulative device. As the result of iGEM project this summer, we suggest an auto-regulation module free from induction which utilizes dual-phase switching system.



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