Prediction by Promoter Logic in Bacterial Quorum Sensing
DSpace at IIT Bombay
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Title |
Prediction by Promoter Logic in Bacterial Quorum Sensing
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Creator |
RAI, N
ANAND, R RAMKUMAR, K SREENIVASAN, V DABHOLKAR, S VENKATESH, KV THATTAI, M |
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Subject |
TO-CELL COMMUNICATION
AERUGINOSA VIRULENCE GENES GRAM-NEGATIVE BACTERIA POSITIVE FEEDBACK VIBRIO-FISCHERI ESCHERICHIA-COLI EXPRESSION AUTOINDUCER ELEMENTS CIRCUIT |
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Description |
Quorum-sensing systems mediate chemical communication between bacterial cells, coordinating cell-density-dependent processes like biofilm formation and virulence-factor expression. In the proteobacterial LuxI/LuxR quorum sensing paradigm, a signaling molecule generated by an enzyme (LuxI) diffuses between cells and allosterically stimulates a transcriptional regulator (LuxR) to activate its cognate promoter (pR). By expressing either LuxI or LuxR in positive feedback from pR, these versatile systems can generate smooth (monostable) or abrupt (bistable) density-dependent responses to suit the ecological context. Here we combine theory and experiment to demonstrate that the promoter logic of pR - its measured activity as a function of LuxI and LuxR levels - contains all the biochemical information required to quantitatively predict the responses of such feedback loops. The interplay of promoter logic with feedback topology underlies the versatility of the LuxI/LuxR paradigm: LuxR and LuxI positive-feedback systems show dramatically different responses, while a dual positive/negative-feedback system displays synchronized oscillations. These results highlight the dual utility of promoter logic: to probe microscopic parameters and predict macroscopic phenotype.
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Publisher |
PUBLIC LIBRARY SCIENCE
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Date |
2014-10-15T12:27:28Z
2014-10-15T12:27:28Z 2012 |
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Type |
Article
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Identifier |
PLOS COMPUTATIONAL BIOLOGY, 8(1)
http://dx.doi.org/10.1371/journal.pcbi.1002361 http://dspace.library.iitb.ac.in/jspui/handle/100/14903 |
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Language |
en
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