Phospholipase A1 is a bacterial outer membrane bound acyl hydrolase with a broad substrate specificity EC:3.1.1.32. It has been proposed that Ser164 is the active site for Swiss:P00631 [1].

1: Inactivation of Escherichia coli outer-membrane phospholipase A by the affinity label hexadecanesulfonyl fluoride. Evidence for an active-site serine. Horrevoets AJ, Verheij HM, de Haas GH; Eur J Biochem 1991;198:247-253. PMID:2040286