title: Enzymic hydroxylation of benzo(alpha)pyrene at the 6-position by vitamin K1-hydroperoxide and rat lung hydroperoxidase.
abstract: 1. The role of vitamin K1 in the hydroxylation of benzo(alpha)pyrene (BP) at the 6-position is correlated with the oxidative formation of vitamin K1-hydroperoxide and its subsequent reaction with BP in the presence of soluble rat lung hydroperoxidase. 2. Vitamin K1-hydroperoxide was synthesized for vitamin K1 and its structure verified by mass spectral analysis and enzymic studies. 3. The major product (the 3,6-BP dione) that results from the non-enzymic oxidation of 6-hydroxy-BP was isolated from the enzymic reaction and characterized by spectroscopic studies. 4. Thiodione (the menadione-glutathione adduct) inhibits both aryl hydrocarbon hydroxylase activity and vitamin K1-hydroperoxide/hydroperoxidase activity.
mesh_terms: D000818:Animals; D001564:Benzo(a)pyrene; D001580:Benzopyrenes / Q000378:metabolism*; D001711:Biotransformation; D005260:Female; D006735:Horseradish Peroxidase; D006900:Hydroxylation; D066298:In Vitro Techniques; D008168:Lung / Q000378:metabolism*; D010084:Oxidation-Reduction; D010544:Peroxidases / Q000378:metabolism*; D051381:Rats; D010837:Vitamin K 1 / Q000031:analogs & derivatives* / Q000378:metabolism
chemical_list: D001580:Benzopyrenes; C031396:vitamin K1-hydroperoxide; D001564:Benzo(a)pyrene; D010837:Vitamin K 1; D006735:Horseradish Peroxidase; D010544:Peroxidases; C032345:vitamin K1-hydroperoxidase