Team:CINVESTAV-IPN-UNAM MX

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<article><h1>Project Description</h1>
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<h2>Construction of a light and oxygen sensor to control protein expression regulation</h2>
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Rhodobacter sphaeroides (Rhb. sphaeroides) is a purple non-sulphur bacterium that belongs to the alpha-proteobacteria, the most metabolically diverse group of organisms on the planet. Part of this versatility is attributed to regulatory proteins which coordinate different metabolic states such as anaerobic photosynthesis and chemi-heterotrophy.
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Specifically, our project is concerned with two regulatory protein systems. The first one, is the two-component global activator under anaerobiosis, PrrB/PrrA. The second system is the light and oxygen mediated repressor/anti-repressor PpsR/AppA. These act in conjunction, along with a slew of other proteins in Rhb. sphaeroides, to tightly control and balance the metabolic demands of the cell. Our team will take these two regulatory systems to express them into a Rhodopseudomonas palustris chassis. The goal is to achieve a better comprehension of the R. palustris regulatory networks through the study of their properties of genetic switches in expressed in a relative isolation within another organism, considering the interference caused by other proteins could be minimal. This will allow us to study in a more precise way how the regulatory systems sense external conditions and transduce them into alternative expression levels via signaling pathways.
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For us to achieve this goal a cassette in which GFP expression is light-dependent by the antirepression of PpsR and oxygen dependent by the activation of PrrA/B system has been designed. All this lab work is accompanied by a computational model which, based on our experimental data, will provide a way of testing our knowledge of these systems. This in turn allows us to enhance the functionality of the device as it expresses heterologous genes in R. palustris.
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Once we have characterized the functionality of these regulatory networks we aim to take advantage of R. palustri’s metabolic versatility, and use this functional bacteria as a microbial factory that will allow the production of products of economic value from byproducts otherwise considered pollutants such as CO2 and other industrial derivatives.
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<p>&nbsp;</p>
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Latest revision as of 18:27, 25 October 2012

CINVESTAV-IPN-UNAM MX

 

 

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