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

J. Ovadi, P. Tompa, B. Vertessy, F. Orosz, T. Keleti, G. R. Welch

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

The kinetics of dynamically interacting enzyme systems are 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.

Original languageEnglish
Pages (from-to)187-190
Number of pages4
JournalBiochemical Journal
Volume257
Issue number1
DOIs
Publication statusPublished - Jan 1 1989

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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