Structure of the thiamine- and flavin-dependent enzyme pyruvate oxidase

Science
Y A Muller, Georg E Schulz

Abstract

Pyruvate oxidase from Lactobacillus plantarum is a tetrameric enzyme that decarboxylates pyruvate, producing hydrogen peroxide and the energy-storage metabolite acetylphosphate. Structure determination at 2.1 angstroms showed that the cofactors thiamine pyrophosphate (TPP) and flavin adenine dinucleotide (FAD) are bound at the carboxyl termini of six-stranded parallel beta sheets. The pyrophosphate moiety of TPP is bound to a metal ion and to a beta alpha alpha beta unit corresponding to an established sequence fingerprint. The spatial arrangement of TPP and FAD suggests that the oxidation of the oxyethyl intermediate does not occur by hydride displacement but rather by a two-step transfer of two electrons.

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Related Concepts

Polymorphism, Crystallization
Flavitan
Lactobacillus
Pyruvate Oxidase
Berolase
X-Ray Diffraction
Protein Conformation, beta-Strand
Macromolecular Compounds

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