Induced, via the two-component regulatory system LiaS/LiaR, by antibiotics (vancomycin, bacitracin, nisin and ramoplanin), cationic antimicrobial peptides (human LL-37 and porcine PG-1), Triton X-100 and severe secretion stress. Up-regulates expression of liaI which in turn induces the liaRS two-component regulatory system.