acid as a new type of mechanism-based inactivator for carboxypeptidase a
作者:Dong H. Kim、Kyung Joo Lee
DOI:10.1016/s0960-894x(97)10031-2
日期:1997.10
O-(Hydroxyacetyl)-L-beta-phenyllactic acid that was conceived as a mechanism-based inactivator for carboxypeptidase A from the X-ray crystal structure of the enzyme complexed with slowly hydrolyzed substrate, Gly-Tyr and a proposed mechanism for the catalytic action, indeed, inactivated the enzyme with the inactivation potency (k(inact)/K-i) of 0.057 M(-1)s(-1). (C) 1997 Elsevier Science Ltd.
Design of mechanism-based carboxypeptidase A inactivators on the basis of the X-ray crystal structure and catalytic reaction pathway [1]
作者:Kyung Joo Lee、Dong H. Kim
DOI:10.1016/s0968-0896(98)00082-0
日期:1998.9
The X-ray crystalstructure of the complex of carboxypeptidase A (CPA) and Gly-Tyr, has been documented. The crystalstructure reveals that both the amide carbonyl oxygen and the terminal amino nitrogen of Gly-Tyr coordinate to the active site zinc ion of CPA in a bidentate fashion, whereby the zinc-bound water molecule is displaced by the amino group. As to the catalytic mechanism of CPA, it is generally