Transient-time analysis of substrate-channelling in interacting enzyme systems.

TitleTransient-time analysis of substrate-channelling in interacting enzyme systems.
Publication TypeJournal Article
Year of Publication1989
AuthorsOvádi, J., P. Tompa, B. Vértessy, F. Orosz, T. Keleti, and G. R. Welch
JournalBiochem J
Volume257
Issue1
Pagination187-90
Date Published1989 Jan 1
ISSN0264-6021
KeywordsKinetics, Multienzyme Complexes, Time Factors
Abstract

The kinetics of dynamically interacting enzyme systems is examined, in the light of increasing evidence attesting to the widespread occurrence of this mode of organization in vivo. The transient time, a key phenomenological parameter for the coupled reaction, is expressed as a function of the lifetime of the intermediate substrate. The relationships between the transient time and the pseudo-first-order rate constants for the coupled reaction by the complexed and uncomplexed enzyme species are indicative of the mechanism of intermediate transfer ('channelling'). In a dynamically interacting enzyme system these kinetic parameters are composite functions of those for the processes catalysed by the complex and by the separated enzymes. The mathematical paradigm can be extended to a linear sequence of N coupled reactions catalysed by dynamically (pair-wise) interacting enzymes.

Alternate JournalBiochem. J.
PubMed ID2920010
PubMed Central IDPMC1135554