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A direct screen for c-di-GMP modulators reveals a Salmonella Typhimurium periplasmic ʟ-arginine-sensing pathway.

Abstract：

:Cyclic-di-GMP (c-di-GMP) is a bacterial second messenger that transduces internal and external signals and regulates bacterial motility and biofilm formation. Some organisms encode more than 100 c-di-GMP-modulating enzymes, but only for a few has a signal been defined that modulates their activity. We developed and applied a high-throughput, real-time flow cytometry method that uses a fluorescence resonance energy transfer (FRET)-based biosensor of free c-di-GMP to screen for signals that modulate its concentration within Salmonella Typhimurium. We identified multiple compounds, including glucose, N-acetyl-d-glucosamine, salicylic acid, and ʟ-arginine, that modulated the FRET signal and therefore the free c-di-GMP concentration. By screening a library of mutants, we identified proteins required for the c-di-GMP response to each compound. Furthermore, low micromolar concentrations of ʟ-arginine induced a rapid translation-independent increase in c-di-GMP concentrations and c-di-GMP-dependent cellulose synthesis, responses that required the regulatory periplasmic domain of the diguanylate cyclase STM1987. ʟ-Arginine signaling also required the periplasmic putative ʟ-arginine-binding protein ArtI, implying that ʟ-arginine sensing occurred in the periplasm. Among the 20 commonly used amino acids, S. Typhimurium specifically responded to ʟ-arginine with an increase in c-di-GMP, suggesting that ʟ-arginine may serve as a signal during S. Typhimurium infection. Our results demonstrate that a second-messenger biosensor can be used to identify environmental signals and define pathways that alter microbial behavior.

journal_name

Sci Signal

journal_title

Science signaling

authors

Mills E,Petersen E,Kulasekara BR,Miller SI

doi

10.1126/scisignal.aaa1796

subject

Has Abstract

pub_date

2015-06-09 00:00:00

pages

ra57

issue

380

eissn

1945-0877

issn

1937-9145

pii

8/380/ra57

journal_volume

8

pub_type

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