1887

Abstract

The role of type I signal peptidases (SPases I) is to remove the signal peptides of preproteins exported by the general secretory pathway. The genome of contains a locus encoding three contiguous SPases I (denoted SipX, SipY and SipZ). The authors recently showed that SipX and SipZ perform distinct functions in protein secretion and bacterial pathogenicity. Here, the regulation of gene expression in broth and in infected eukaryotic cells was studied. The results show that expression of the three genes is (i) controlled by two distinct promoter regions that respond differently to growth phase and temperature variations, and (ii) influenced by PrfA (the transcriptional activator regulating most of the virulence genes of ) and the stress proteins ClpC and ClpP. It was found that gene expression was strongly upregulated upon infection of eukaryotic cells when bacteria were still entrapped in the phagosomal compartment. This upregulation is compatible with the need of to optimize its production of virulence factors in the early stage of the intracellular cycle.

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2005-11-01
2019-11-18
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