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The enzymic nature of antibody catalysis: development of multistep kinetic processing.

Authors
  • Benkovic, S J
  • Adams, J A
  • Borders, C L Jr
  • Janda, K D
  • Lerner, R A
Type
Published Article
Journal
Science (New York, N.Y.)
Publication Date
Nov 23, 1990
Volume
250
Issue
4984
Pages
1135–1139
Identifiers
PMID: 2251500
Source
Medline
License
Unknown

Abstract

Detailed kinetic investigations of a catalytic antibody that promotes the hydrolyses of an anilide and phenyl ester show that this catalyst uses a multistep kinetic sequence resembling that found in serine proteases to hydrolyze its substrates, although antibody was elicited to a single transition-state analog. Like the serine proteases the antibody catalyzes the hydrolysis reactions through a putative covalent intermediate, but unlike the enzymes it may use hydroxide ion to cleave the intermediates. Nevertheless, the antibody is a potent catalyst with turnover at higher pH values rivaling that of chymotrypsin. This analysis also reveals that turnover by the antibody is ultimately limited by product desorption, suggesting that improvements in catalytic efficiency may be achieved by judicious changes in the structure of the substrate, so that it is not superimposable on that of the eliciting hapten.

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