The nature of interaction between the carboxylate of substrates and the guanidinium moiety of Arg-145 in carboxypeptidase A probed by inhibitors of the enzyme
摘要:
Replacement of the alpha-proton of 2-benzyl-3-hydoroxypropanoic acid a competitive inhibitor of carboxypeptidase A with a fluoro group brought about a 2-fold increase in K-i value (0.61 mM --> 1.19 mM), while pK(a) value decreased by 1.4 units (4.36 --> 2.95), suggesting that the carboxylate of the inhibitor and that of substrates as well are hydrogen bonded to the guanidinium moiety of Arg-145 of the enzyme. Copyright (C) 1996 Elsevier Science Ltd
can reductively desymmetrize a large collection of easily available halomalonic esters to α-halo-β-hydroxyesters. These polyfunctionalized tertiary alkyl fluorides, chlorides, and bromides proved to be useful intermediates toward fluorinated drug analogs and polyhalogenated monoterpenes. The facile intramolecularepoxidation of the chiral chloride and bromide products has also enabled expeditious access