VraS histidine kinase (VraS)

VraS histidine kinase is a membrane-bound sensor enzyme functioning as part of the VraSR two-component regulatory system in Staphylococcus aureus and other bacteria[1][2]. The protein detects cell wall stress caused by antibiotics and environmental stimuli, then undergoes histidine autophosphorylation, subsequently transferring the phosphate to the response regulator VraR[1][2]. This phosphorylation cascade activates expression of genes involved in cell wall synthesis, stress adaptation, and resistance to cell wall-active antibiotics including vancomycin and teicoplanin[1][2][5]. Mutations or inhibition of VraS can significantly affect bacterial susceptibility to these antibiotics and have been linked to the emergence of resistant strains (notably VISA—vancomycin-intermediate Staphylococcus aureus)[2][4]. VraS is a validated target for antibacterial drug discovery, and selective inhibitors like NH125 have been shown to sensitize S. aureus to multiple antibiotics by blocking VraS activity[5]. The VraS protein comprises a transmembrane domain, a cytoplasmic kinase (containing the HisKA and HATPase_c domains), and is classified as a type III, unorthodox histidine kinase[1].

Other names

Sensor protein VraSTwo-component system sensor kinase VraSVancomycin resistance-associated sensor protein

Inhibition of VraS autophosphorylation (e.g., by NH125) Modulation of cell wall stress responses by altering VraS-mediated signal transduction