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• W2051255911 abstract "Cellobiose dehydrogenase (CDH), an extracellular hemoflavoenzyme produced by cellulose-degrading cultures of Phanerochaete chrysosporium, oxidizes cellobiose to cellobionolactone. The enzyme contains one 6-coordinate, low-spin b-type heme and one FAD cofactor per monomeric protein. In this work, resonance Raman (RR) spectra are reported for the oxidized, reduced, and deflavo forms of CDH as well as the individual flavin and heme domains of the enzyme obtained by peptide proteolysis. The RR spectra of the flavin and heme groups of CDH were assigned by comparison to the spectra of other hemoflavoenzymes and model compounds. Proteolytic cleavage of the CDH domains had only a minimal spectroscopic effect on the vibrational modes of the heme and FAD cofactors. Excitation of the oxidized CDH holoenzyme at 413 or 442 nm resulted in photoreduction of the heme. However, the same excitation wavelength used on the deflavo form of the enzyme or on the heme domain alone did not cause photoreduction, indicating that photoinitiated electron transfer requires the FAD cofactor. These observations suggest an enzymatic mechanism whereby reducing equivalents obtained from the oxidation of cellobiose are transferred from the FAD to the heme. A similar mechanism has been proposed for flavocytochrome b2 of Saccharomyces cerevisiae which oxidizes lactate to pyruvate (A. Desbois et al., 1989, Biochemistry 28, 8011-8022)." @default.
• W2051255911 created "2016-06-24" @default.
• W2051255911 creator A5031143631 @default.
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• W2051255911 date "1997-05-01" @default.
• W2051255911 modified "2023-09-27" @default.
• W2051255911 title "Resonance Raman Spectroscopic Studies of Cellobiose Dehydrogenase fromPhanerochaete chrysosporium" @default.
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• W2051255911 doi "https://doi.org/10.1006/abbi.1997.9987" @default.
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