Abstract
A method for the purification of staphylococcal exopenicillinase is described. The enzyme has a molecular weight of 29,600. Analysis of the amino acid content revealed that the molecule contains no cysteine and has lysine as the N-terminal amino acid, The purified exopenicillinase has sufficient "cephalosporinase" activity to account for all the "cephalo-sporinase" found in culture filtrates of S. aureus strains PCI, 524 and 8325-18.