VirS sensor histidine kinase (VirS)

VirS is a membrane-bound sensor histidine kinase that serves as the primary sensory component of the VirR/VirS two-component system in Clostridium perfringens [UniProt P0C222]. This system is the master regulator of virulence, controlling the production of potent toxins such as alpha-toxin (phospholipase C) and perfringolysin O, which are essential for the development of gas gangrene and necrotic enteritis [PubMed: 10493224]. VirS detects extracellular signaling molecules, likely including a quorum-sensing peptide known as the BAP (Burrowing-inducing Autoinducing Peptide), and undergoes autophosphorylation before transferring the phosphate to the response regulator VirR [PubMed: 21854644]. Activated VirR then modulates the expression of various genes and regulatory RNAs, most notably VR-RNA, which post-transcriptionally regulates toxin production [PubMed: 12730103]. Because VirS is critical for the pathogenicity of C. perfringens but not for its primary survival, it is a high-priority target for anti-virulence therapies designed to disarm the pathogen without inducing the strong selective pressure associated with traditional antibiotics [PubMed: 30254111].

Other names

VirSSensor protein VirSHistidine kinase VirSVirR/VirS system sensor

Inhibition of the VirS sensor kinase activity or its interaction with signaling peptides to prevent the activation of the VirR/VirS regulatory cascade and subsequent toxin production.