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Detection of a C4a-Hydroperoxyflavin Intermediate in the Reaction of a Flavoprotein Oxidase.
- Source :
-
Biochemistry . 8/19/2008, Vol. 47 Issue 33, p8485-8490. 6p. 1 Chart, 4 Graphs. - Publication Year :
- 2008
-
Abstract
- This work describes for the first time the identification of a reaction intermediate, C4a- hydroperoxyflavin, during the oxidative half-reaction of a flavoprotein oxidase, pyranose 2-oxidase (P2O) from Trametes multicolor, by using rapid kinetics. The reduced P2O reacted with oxygen with a forward rate constant of 5.8 × 104 M-1 s-1 and a reverse rate constant of 2 s-1, resulting in the formation of a C4a-hydroperoxyflavin intermediate which decayed with a rate constant of 18 s-1. The absorption spectrum of the intermediate resembled the spectra of flavin-dependent monooxygenases. A hydrophobic cavity formed at the re side of the flavin ring in the closed state structure of P2O may help in stabilizing the intermediate. [ABSTRACT FROM AUTHOR]
- Subjects :
- *FLAVINS
*FLAVOPROTEINS
*OXIDASES
*OXIDATION
*ABSORPTION spectra
*MONOOXYGENASES
Subjects
Details
- Language :
- English
- ISSN :
- 00062960
- Volume :
- 47
- Issue :
- 33
- Database :
- Academic Search Index
- Journal :
- Biochemistry
- Publication Type :
- Academic Journal
- Accession number :
- 34172778
- Full Text :
- https://doi.org/10.1021/bi801039d