A Kinetic Study of the Horse-Radish Peroxidase-Catalyzed Oxidation of Iodide
1968; Wiley; Volume: 5; Issue: 1 Linguagem: Inglês
10.1111/j.1432-1033.1968.tb00347.x
ISSN1432-1033
Autores Tópico(s)Analytical chemistry methods development
ResumoEuropean Journal of BiochemistryVolume 5, Issue 1 p. 133-142 Free Access A Kinetic Study of the Horse-Radish Peroxidase-Catalyzed Oxidation of Iodide F. Björkstén, F. Björkstén Valtion Seerumlaitos Mannerheimintie 166, Helsinki 28, FinlandSearch for more papers by this author F. Björkstén, F. Björkstén Valtion Seerumlaitos Mannerheimintie 166, Helsinki 28, FinlandSearch for more papers by this author First published: June 1968 https://doi.org/10.1111/j.1432-1033.1968.tb00347.xCitations: 28 AboutSectionsPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat Abstract Reaction steps in which H+ and I− are added to horse-radish peroxidase have been studied by examining the steady-state kinetics of the peroxidase-catalyzed oxidation of I−. For this purpose spectrophotometric methods for following the reaction were developed. Kinetic data were interpreted by extensions of methods proposed by Wong and Hanes in 1962 and Cleland in 1963. It is shown that H+ and I− are transferred to both ferriperoxidase (the free enzyme) and compound II in separate steps. Reaction with undissociated HI is not important. The ferriperoxidase-H+-I− complex is similar to complexes known to be produced in the presence of singly charged anions other than I−. Addition of both H+ and I− is required for the reduction of compound II to ferriperoxidase. The need for H+ brings support to George's suggestion made in 1953 that compound II contains a ferryl FeO2+ structure. 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