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JBC, Vol. 252, Issue 9, 2934-2939, May, 1977

Kinetic evidence for an acyl-enzyme intermediate in D-alanine carboxypeptidases of Bacillus subtilis and Bacillus stearothermophilus

T. Nishino, J. W. Kozarich and J. L. Strominger

The kinetics of hydrolysis and transpeptidation of the synthetic substrate diacetyl-L-lysyl-D-alanyl-D-alanine and of the natural substrate UDP-acetylmuramyl pentapeptide and related compounds catalyzed by the D-alanine carboxypeptidases of Bacillus subtilis and Bacillus stearothermophilus in the presence of the nucleophiles hydroxylamine or glycine have been examined. These kinetic data suggest that an acyl-enzyme intermediate is formed in the first step of the reaction and that the transpeptidation is the consequence of the partitioning of this intermediate between water and the nucleophile in the second step.
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