Substrate-binding region of cytochrome P-450SCC (P-450 XIA1). Identification and primary structure of the cholesterol binding region in cytochrome P-450SCC.
Biochim Biophys Acta
; 1161(2-3): 124-30, 1993 Feb 13.
Article
en En
| MEDLINE
| ID: mdl-8431464
ABSTRACT
Cytochrome P-450SCC (P-450 XIA1) from bovine adrenocortical mitochondria was investigated using a suicide substrate [14C]methoxychlor. [14C]Methoxychlor irreversibly abolished the activity of the side-chain cleavage enzyme for cholesterol (P-450SCC) and the inactivation was prevented in the presence of cholesterol. The binding of [14C]methoxychlor and cytochrome P-450SCC occurred in a molar ratio of 11 and the cholesterol-induced difference spectrum of cytochrome P-450SCC was similar with the methoxychlor-induced difference spectrum. [14C]Methoxychlor-binding peptides were purified from tryptic-digested cytochrome P-450SCC modified with [14C]methoxychlor. Determination of the sequence of the amino-acid residues of a [14C]methoxychlor-binding peptide allowed identification of the peptide comprising the amino-terminal amino-acid residues 8 to 28.
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Banco de datos:
MEDLINE
Asunto principal:
Enzima de Desdoblamiento de la Cadena Lateral del Colesterol
/
Colesterol
Tipo de estudio:
Diagnostic_studies
Límite:
Animals
Idioma:
En
Año:
1993
Tipo del documento:
Article