Figure 6From: VirS, an OmpR/PhoB subfamily response regulator, is required for activation of vapA gene expression in Rhodococcus equi Proposed model of vapA transcriptional regulation in R. equi . Transcription of the icgA operon is VirR dependent and is regulated by temperature and pH via unknown mechanisms. VirS activates transcription of the vapA promoter.Back to article page