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. 1984 Jul;81(14):4343–4347. doi: 10.1073/pnas.81.14.4343

Catalase: a tetrameric enzyme with four tightly bound molecules of NADPH.

H N Kirkman, G F Gaetani
PMCID: PMC345585  PMID: 6589599

Abstract

Catalases (H2O2:H2O2 oxidoreductase, EC 1.11.1.6) from many species are known to be tetramers of 60,000-dalton subunits, with four heme groups per tetramer. Previous authors have determined the amino acid sequence and three-dimensional structure of bovine liver catalase. Studies of the regulation of the pentose phosphate pathway led the present authors to a search for proteins that bind NADP+ and NADPH in human erythrocytes. An unexpected result of that search was the finding that a major reservoir of bound NADPH in human erythrocytes is catalase. Each tetrameric molecule of human or bovine catalase contains four molecules of tightly bound NADPH. The binding sites have the relative affinities NADPH greater than NADH greater than NADP+ greater than NAD+. NADPH does not seem to be essential for the enzymic conversion of H2O2 to O2 and water but does provide protection of catalase against inactivation by H2O2.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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