Coenzyme Models. 10. Rapid Oxidation of NADH by a Flavin Immobilized in Cationic Polyelectrolytes

Seiji Shinkai, Shinji Yamada, Toyoki Kunitake

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30 Citations (Scopus)

Abstract

The title flavin rapidly oxidizes NADH, the observed enhancement being of 460-4650-fold compared with 3-methyltetra-O-acetylriboflavin. Analysis of the kinetic data at 30 °C established that the reaction proceeds according to the Michaelis-Menten kinetics at low ionic strength (µ=0.02: Km=ca. 10-5 M, kcat=0.06-0.37 s-1) and according to the simple second-order kinetics at high ionic strength (µ=0.3), the largest rate difference being 342-fold. On the other hand, the oxidation of l-benzyl-l,4-dihydronicotinamide, a NADH model compound, was not accelerated by the use of the title flavin. It is concluded, therefore, that the formation of the polymeric flavin-NADH complexes due to the electrostatic interaction is responsible for the marked rate enhancement. This is the first example that the oxidation of NADH is facilitated in the nonenzymatic system.

Original languageEnglish
Pages (from-to)65-68
Number of pages4
JournalMacromolecules
Volume11
Issue number1
DOIs
Publication statusPublished - Jan 1 1978

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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