Energy differences and their relevance to enzyme and intramolecular catalysis

Michael I. Page

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

It is emphasised that free energy changes represent the difference between two states. Intramolecular reactions often proceed at a rate faster than the analogous intermolecular reaction because of the greater entropy of the initial state of the intermolecular reaction. This rate enhancement can be increased if strain in the initial state is relieved in the transition state, or be decreased if strain energy is increased in the transition state of the intramolecular reaction. Binding energies between enzymes and substrates represent energy differences between initial and final states. The specificity of enzyme-catalysed reactions depends on differences between initial and transition states. Solvation effects on specificity are initial state and not transition state effects in the α-chymotrypsin-catalysed hydrolysis of 4-nitrophenyl acetate and N-acetyl-L-tryptophan methyl ester.

Original languageEnglish
Pages (from-to)241-253
Number of pages13
JournalJournal of Molecular Catalysis
Volume47
Issue number2-3
DOIs
Publication statusPublished - 26 Sep 1988

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Catalysis
catalysis
enzymes
Enzymes
Solvation
Chymotrypsin
Strain energy
Binding energy
Tryptophan
Free energy
Hydrolysis
Esters
Entropy
energy
Substrates
tryptophan
solvation
hydrolysis
esters
acetates

Cite this

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Energy differences and their relevance to enzyme and intramolecular catalysis. / Page, Michael I.

In: Journal of Molecular Catalysis, Vol. 47, No. 2-3, 26.09.1988, p. 241-253.

Research output: Contribution to journalArticle

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AB - It is emphasised that free energy changes represent the difference between two states. Intramolecular reactions often proceed at a rate faster than the analogous intermolecular reaction because of the greater entropy of the initial state of the intermolecular reaction. This rate enhancement can be increased if strain in the initial state is relieved in the transition state, or be decreased if strain energy is increased in the transition state of the intramolecular reaction. Binding energies between enzymes and substrates represent energy differences between initial and final states. The specificity of enzyme-catalysed reactions depends on differences between initial and transition states. Solvation effects on specificity are initial state and not transition state effects in the α-chymotrypsin-catalysed hydrolysis of 4-nitrophenyl acetate and N-acetyl-L-tryptophan methyl ester.

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