Mechanism of the cyanide-catalyzed oxidation of α-ketoaldehydes and α-ketoalcohols

Tadahiko Mashino, Irwin Fridovich

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Cyanide catalyzes the reduction of dioxygen or of ferricytochrome c by dihydroxyacetone phosphate. The rapid initial phase of these reactions, but not the subsequent slow phase, was augmented by incubating the triose phosphate aerobically or anaerobically at pH 9.0 prior to adding the cyanide. The aerobic incubation, which was most effective, was associated with a decline in enediol, whereas the less effective anaerobic incubation was accompanied by an increase in enediol content. This suggested that the α-ketoaldehyde product of autoxidation of the enediol, rather than the enediol itself, was responsible for the rapid phase reaction which followed addition of cyanide. This was confirmed by exploring the cyanide-catalyzed oxidation of the α-ketoaldehyde, phenylglyoxal. The inhibitory effect of the manganese-containing superoxide dismutase indicated that O2- was a kinetically important intermediate of the rapid phase reaction. A reaction mechanism is proposed which is consistent with the results presented.

Original languageEnglish
Pages (from-to)163-170
Number of pages8
JournalArchives of Biochemistry and Biophysics
Volume252
Issue number1
DOIs
Publication statusPublished - 1987 Jan
Externally publishedYes

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology

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