[Chemical modification of cholesterol-hydroxylating cytochrome P450 from bovine adrenal cortex mitochondria by acetylimidazole].
The state and role of tyrosine residues in adrenocortical cytochrome P-450scc was investigated. Spectrophotometric titration experiments showed the existence of two types of tyrosine residues in the hemoprotein molecule, i.e., exposed (pK 9.25) and buried (pK 10.75) ones. Chemical modification of the exposed tyrosine residues with N-acetylimidazole was carried out. The data obtained indicate the involvement of these residues in the interaction with adrenodoxin.
S A
SA
Usanov
I A
IA
Pikuleva
A A
AA
Akhrem
V L
VL
Chashchin
D000302:Adrenal Cortex / Q000201:enzymology*; D000325:Adrenodoxin / Q000378:metabolism; D000818:Animals; D002417:Cattle; D002784:Cholesterol / Q000378:metabolism*; D003577:Cytochrome P-450 Enzyme System / Q000378:metabolism*; D006900:Hydroxylation; D007093:Imidazoles / Q000494:pharmacology*; D066298:In Vitro Techniques; D008928:Mitochondria / Q000201:enzymology*; D013056:Spectrophotometry, Ultraviolet; D014443:Tyrosine / Q000032:analysis
D007093:Imidazoles; D000325:Adrenodoxin; D014443:Tyrosine; D003577:Cytochrome P-450 Enzyme System; D002784:Cholesterol; C012160:N-acetylimidazole
Khimicheskaia modifikatsiia kholesteringidroksiliruiushchego tsitokhroma P-450 iz mitokhondriĭ kory nadpochechnikov byka atsetilimidazolom.