To successfully colonize and persist within a host niche, bacteria must properly regulate their gene expression profiles. The marine bacterium Vibrio fischeri establishes a mutualistic symbiosis within the light organ of the Hawaiian squid, Euprymna scolopes. Here, we show that the repressor NagC of V.fischeri directly regulates several chitin- and N-acetyl-d-glucosamine-utilization genes that are co-regulated during productive symbiosis. We also demonstrate that repression by NagC is relieved in the presence of N-acetyl-d-glucosamine-6-phosphate, the intracellular form of N-acetyl-d-glucosamine. We find that gene repression by NagC is critical for efficient colonization of E.scolopes. Further, our study shows that NagC regulates genes that affect the normal dynamics of host colonization.
All Science Journal Classification (ASJC) codes
- Molecular Biology