Peptide which can recruit, activate and subsequently lyse human neutrophils, thus eliminating the main cellular defense against infection. Stimulates the secretion of the chemotactic factor interleukin-8 (IL-8). The ensuing activation process triggers an inflammatory response in the host, thus contributing greatly to virulence. Also possesses hemolytic activity, which may contribute to the development of disease. Up-regulated by agr. Peptide production is higher in most prevalent community-associated MRSA strains than in hospital-associated MRSA strains. Belongs to the phenol-soluble modulin alpha peptides family.