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- W1486108268 abstract "Oxidation of sulfite to sulfate by sulfite oxidase is inhibited when the enzyme is treated with reagents known to modify imidazole and carboxyl groups. Modification inhibits the oxidation of sulfite by the physiological electron acceptor cytochrome c, but not by the artificial acceptor ferricyanide. This indicates interference with reaction steps that follow the oxidation of sulfite by the enzyme's molybdenum cofactor. Reaction with diethylpyrocarbonate modifies ten histidines per enzyme monomer. Loss of activity is concomitant to the modification of only a single histidine residue. Inactivation takes place at the same rate in free sulfite oxidase and in the sulfite-oxidase--cytochrome-c complex. Blocking of carboxyl groups with water-soluble carbodiimides inactivates the enzyme. But none of the enzyme's carboxyl groups seems to be essential in the sense that its modification fully abolishes activity. The pattern of inactivation by chemical modification of sulfite oxidase is quite similar to that observed previously for cytochrome c peroxidase from yeast [Bosshard, H. R., Bänziger, J., Hasler, T. and Poulos, T. L. (1984) J. Biol. Chem. 259, 5683-5690; Bechtold, R. and Bosshard, H. R. (1985) J. Biol. Chem. 260, 5191-5200]. The two enzymes have very different structures yet share cytochrome c as a common substrate of which they recognize the same electron-transfer domain around the exposed heme edge." @default.
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- W1486108268 date "1986-09-01" @default.
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- W1486108268 title "Sulfite oxidase from chicken liver. The role of imidazole and carboxyl groups for the reaction with cytochrome c" @default.
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- W1486108268 doi "https://doi.org/10.1111/j.1432-1033.1986.tb09913.x" @default.
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