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JOURNAL OF BIOLOGICAL CHEMISTRY
Volume 282, Issue 17, Pages 12860-12870Publisher
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DOI: 10.1074/jbc.M611593200
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Cyclic diguanylate (c-di-GMP) is an allosteric activator and second messenger implicated in the regulation of a variety of biological processes in diverse bacteria. In Vibrio cholerae, c-diGMP has been shown to inversely regulate biofilm-specific and virulence gene expression, suggesting that c-di-GMP signaling is important for the transition of V. cholerae from the environment to the host. However, the mechanism behind this regulation remains unknown. Recently, it was proposed that the PilZ protein domain represents a c-di-GMP-binding domain. Here we show that V. cholerae PilZ proteins bind c-di-GMP specifically and are involved in the regulation of biofilm formation, motility, and virulence. These findings confirm a role for PilZ proteins as c-di-GMP-sensing proteins within the c-di-GMP signaling network.
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