期刊
JOURNAL OF INORGANIC BIOCHEMISTRY
卷 103, 期 10, 页码 1375-1379出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.jinorgbio.2009.07.011
关键词
Catalase; Peroxynitrite; Stopped-flow spectrophotometry
资金
- COST Action [CM0603]
Peroxynitrite (ONOO-/ONOOH), the product of the diffusion controlled reaction between nitric oxide ((NO)-N-center dot) and superoxide anion (O-2(-center dot)), is a strong oxidizing and nitrating agent. Several heme proteins react rapidly with peroxynitrite, some of them catalyze its decomposition. In this work we found, contrary to previous reports, that catalase, a ferriheme enzyme, catalytically scavenges peroxynitrite. The second-order reaction rate constants of peroxynitrite decay catalyzed by catalase increase with decreasing pH and are equal to (2.7 +/- 0.2) x 10(6), (1.7 +/- 0.1) x 10(6) and (0.8 +/- 0.1) x 10(6) M-1 s(-1) at pH 6.1, 7.1 and 8.0, respectively. This dependence suggests that peroxynitrous acid, ONOOH, is the species that reacts with heme center of catalase. The possible reaction mechanisms of the decay of peroxynitrite catalyzed by catalase and physiological relevance of this reaction are discussed. (C) 2009 Elsevier Inc. All rights reserved.
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