Part of the pathway by which MgrA and SarA control autolysis. Involved in regulation of virulence and autolysis genes such as hla, splA, aur, scp, lrgB, scdA and atl. May also act as an activator for the expression of regulatory genes agr, lytSR and ArlRS. Repressed by SarA and MgrA by binding to the sarV promoter region. Belongs to the SarA family.