Transcriptional Regulation of hmsB , A Temperature-Dependent Small RNA, by RovM in Yersinia pestis Biovar Microtus

HmsB, a temperature-dependent sRNA, promotes biofilm formation by Yersinia pestis , but whether its own expression is regulated by other regulators is still poorly understood. RovM is a global regulator that activates biofilm formation but represses the virulence of Y. pestis . In this work, the results of primer extension, quantitative real-time PCR (qRT-PCR), and LacZ fusion demonstrated that RovM was able to activate hmsB expression. However, the results of electrophoretic mobility shift assay (EMSA) showed that His-RovM did not bind to the upstream DNA region of hmsB . Thus, RovM may exert its regulatory action on hmsB expression in an indirect manner. The data presented here enriched the content of the regulatory circuits that control gene expression in Y. pestis .