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Expression of theYersinia enterocolitica inv gene is dependent on growth phase and temperature.inv is maximally expressed at 23°C in late-exponential- to early-stationary-phase cultures. We previously reported the isolation of aY. enterocolitica mutant (JB1A8v) that shows a decrease in invasin levels yet is hypermotile when grown at 23°C. JB1A8v has a transposon insertion withinuvrC . Described here is the isolation and characterization of a clone that suppresses these mutant phenotypes of theuvrC mutant JB1A8v. This suppressing clone encodes ClpB (a Clp ATPase homologue). TheY. enterocolitica ClpB homologue is 30 to 40% identical to the ClpB proteins from various bacteria but is 80% identical to one of the two ClpB homologues ofYersinia pestis . AclpB ::TnMax2 insertion mutant (JB69Qv) was constructed and determined to be deficient in invasin production and nonmotile when grown at 23°C. Analysis ofinv andfleB (flagellin gene) transcript levels in JB69Qv suggested that ClpB has both transcriptional and posttranscriptional effects. In contrast, aclpB null mutant, BY1v, had no effect on invasin levels or motility. A model accounting for these observations is presented.

Yersinia enterocolitica ClpB Affects Levels of Invasin and Motility