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Interaction of rhodanese with intermediates of oxygen reduction
Author(s) -
Cannella Carlo,
Berni Rodolfo,
D'Ottavio Palmerino
Publication year - 1983
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/0014-5793(83)81074-6
Subject(s) - rhodanese , chemistry , sulfurtransferase , autoxidation , thiosulfate , catalase , cyanide , superoxide dismutase , hydrogen peroxide , sulfur , oxidizing agent , oxygen , enzyme , peroxide , biochemistry , reducing agent , photochemistry , organic chemistry , cysteine
Cyanide‐promoted inactivation of the enzyme rhodanese [thiosulfate sulfurtransferase (EC 2.8.1.1)] in the presence of ketoaldehydes is caused by reduced forms of molecular oxygen generated during autoxidation of the reaction products. The requirement of both catalase and superoxide dismutase to prevent rhodanese inactivation indicates that hydroxyl radical could be the most efficient inactivating agent. Rhodanese, also in the less stable sulfur‐free form, shows a different sensitivity towards oxygen activated species. While the enzyme is unaffected by superoxide radical, it is rapidly inactivated by hydrogen peroxide. The extent of inactivation depends on the molar ratio between sulfur‐free enzyme and oxidizing agent. Fully inactive enzyme is reactivated by reduction with its substrate thiosulfate.