Function
Regulated intramembrane proteolysis (RIP) occurs when an extracytoplasmic signal (possibly oxidative stress) triggers a concerted proteolytic cascade to transmit information and elicit cellular responses. The membrane-spanning regulatory substrate protein (includes anti-sigma factors RskA, RslA, RsmA, and PbpB) is first cut extracytoplasmically (site-1 protease, S1P), then within the membrane itself (site-2 protease, S2P, this entry), while cytoplasmic proteases finish degrading the regulatory protein, liberating the effector protein (ECF sigma factors SigK, SigL and SigM).
Sequence
MMFGIGIVLFALAILVSVALHECGHMWVARATGMKVRRYFVGFGPTLWSTRRANRLGSTEYGIKAIPLGGFCDIAGMTSVDEIAPEDRPYAMYKQKVWKRVAVLFAGPAMNFVIGLVLIYGIAIVWGLPNLHQPTTAIVGETGCVAPQITLEEMGECTGPGPAALAGIQAGDEIVKVGDTEVKDFAGMAAAVRKLDGPTRIEFKRDGRVMDTVVDVTPTQRFTSADASAPSTVGAIGVSAVPVQPPAQYNPITAVPATFAFTGDLAVELGKSLAKIPTKIGALVEAIGGGERDKETPISVVGASIIGGETVDAGLWVAFWFFLAQLNFVLGAINLVPLLPFDGGHIAVATYEKIRNMIRSARGMVAAGPVNYLKLMPATYVVLAVVAGYMLLTVTADLVNPLSIFQ