title: Solubilization and characterization of the partially purified penicillin sensitive D-alanine carboxypeptidase of Neisseria gonorrhoeae.
abstract: Treatment of crude gonococcal cell envelopes with a solution of 2 M KCl + 1% Brij 36T resulted in the solubilization of a portion of the D-alanine carboxypeptidase activity of Neisseria gonorrhoeae envelopes. This soluble enzyme preparation was partially resolved by chromatography on a column of DEAE-cellulose. The partially purified enzyme eluted from the column with a gradient of NaCl (0-1 M), catalysed the release of D-alanine from a radioactively labelled UDP-N-acetylmuramyl-pentapeptide with a pH optimum of 8.6. The Km for the soluble enzyme acting on this substrate was 0.18 mM. The enzyme activity was sensitive to inhibition by low concentrations of the beta-lactam antibiotics, penicillin G, ampicillin, oxacillin and mecillinam.
mesh_terms: D002268:Carboxypeptidases / Q000302:isolation & purification*; D002462:Cell Membrane / Q000201:enzymology; D002848:Chromatography, DEAE-Cellulose; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D002267:Muramoylpentapeptide Carboxypeptidase / Q000302:isolation & purification* / Q000378:metabolism; D009344:Neisseria gonorrhoeae / Q000201:enzymology*; D010406:Penicillins / Q000494:pharmacology; D012995:Solubility
chemical_list: D010406:Penicillins; D002268:Carboxypeptidases; D002267:Muramoylpentapeptide Carboxypeptidase