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Quadruple quorum-sensing inputs control Vibrio cholerae virulence and maintain system robustness.

ABSTRACT: Bacteria use quorum sensing (QS) for cell-cell communication to carry out group behaviors. This intercellular signaling process relies on cell density-dependent production and detection of chemical signals called autoinducers (AIs). Vibrio cholerae, the causative agent of cholera, detects two AIs, CAI-1 and AI-2, with two histidine kinases, CqsS and LuxQ, respectively, to control biofilm formation and virulence factor production. At low cell density, these two signal receptors function in parallel to activate the key regulator LuxO, which is essential for virulence of this pathogen. At high cell density, binding of AIs to their respective receptors leads to deactivation of LuxO and repression of virulence factor production. However, mutants lacking CqsS and LuxQ maintain a normal LuxO activation level and remain virulent, suggesting that LuxO is activated by additional, unidentified signaling pathways. Here we show that two other histidine kinases, CqsR (formerly known as VC1831) and VpsS, act upstream in the central QS circuit of V. cholerae to activate LuxO. V. cholerae strains expressing any one of these four receptors are QS proficient and capable of colonizing animal hosts. In contrast, mutants lacking all four receptors are phenotypically identical to LuxO-defective mutants. Importantly, these four functionally redundant receptors act together to prevent premature induction of a QS response caused by signal perturbations. We suggest that the V. cholerae QS circuit is composed of quadruple sensory inputs and has evolved to be refractory to sporadic AI level perturbations.

SUBMITTER: Jung SA

PROVIDER: S-EPMC4398556 | biostudies-literature | 2015 Apr

REPOSITORIES: biostudies-literature

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Quadruple quorum-sensing inputs control Vibrio cholerae virulence and maintain system robustness.

Jung Sarah A SA Chapman Christine A CA Ng Wai-Leung WL

PLoS pathogens 20150415 4

Bacteria use quorum sensing (QS) for cell-cell communication to carry out group behaviors. This intercellular signaling process relies on cell density-dependent production and detection of chemical signals called autoinducers (AIs). Vibrio cholerae, the causative agent of cholera, detects two AIs, CAI-1 and AI-2, with two histidine kinases, CqsS and LuxQ, respectively, to control biofilm formation and virulence factor production. At low cell density, these two signal receptors function in parall ...[more]

PMID: 25874462

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Project description:A major challenge faced by bacteria is infection by bacteriophage (phage). Abortive infection is one strategy for combating phage in which an infected cell kills itself to limit phage replication, thus protecting neighboring kin. One class of abortive infection systems is the cyclic oligonucleotide based anti-phage signaling system (CBASS) which relies on two core enzymatic activities; an oligo-nucleotide cyclase that is activated following phage infection and a cyclic-oligo-nucleotide sensitive effector whose activity kills the infected cell. However, the mechanisms behind the deployment and activation of these lethal CBASS systems prior to and following infection have largely remained a mystery. While exploring unique genomic features of the current pandemic Vibrio cholerae biotype El Tor for clues underlying its pandemic success we found its CBASS was spuriously activated by the folate biosynthesis inhibitor sulfamethoxazole, but only after the population had reached a high-cell density. This population density-dependent activity revealed that transcription of both the oligo-nucleotide cyclase, dncV, and the CBASS phospholipase effector, capV, is enhanced at high-cell density by quorum sensing. Taken together, these results demonstrate that the V. cholerae CBASS is deployed when the environment is densely populated and activated in response to a perturbation in folate biosynthesis. IMPORTANCE To counteract infection with phage, bacteria have evolved a myriad of molecular defense systems. Some of these systems initiate a process called abortive infection, in which the infected cell kills itself to prevent phage propagation. However, such systems must be inhibited in the absence of phage infection to prevent spurious death of the host. Here, we show that the cyclic oligonucleotide based anti-phage signaling system (CBASS) accomplishes this by sensing intracellular folate molecules and only expressing this system in a group. These results enhance our understanding of the evolution of the seventh Vibrio cholerae pandemic and more broadly how bacteria defend themselves against phage infection.

Dataset Information

Quadruple quorum-sensing inputs control Vibrio cholerae virulence and maintain system robustness.

Publications

Quadruple quorum-sensing inputs control Vibrio cholerae virulence and maintain system robustness.

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