RT Journal Article SR Electronic T1 Esterase, Peptidase, and the Enhancement of Guinea Pig Complement JF The Journal of Immunology JO J. Immunol. FD American Association of Immunologists SP 8 OP 11 VO 96 IS 1 A1 Amiraian, Kenneth A1 Purcell, James D. YR 1966 UL http://www.jimmunol.org/content/96/1/8.abstract AB The complement-enhancing property of bovine carboxypeptidase A is lost when the enzyme is treated with acetylimidazole. Bovine carboxypeptidase B is as effective in enhancing guinea pig complement as carboxypeptidase A when used at five times the molar concentration as the latter. These data suggest that the peptidase, and not the esterase, activity of carboxypeptidase A is associated with the complement-enhancing property. Bovine procarboxypeptidase A, inert in immune hemolysis, will, when treated with trypsin, enhance guinea pig complement.