P-45011 beta-dependent conversion of cortisol to cortisone, and 19-hydroxyandrostenedione to 19-oxoandrostenedione.

Abstract:

:Purified bovine adrenal P-45011 beta has been shown to catalyze conversions of cortisol to cortisone (11-oxidase activity), and 19-hydroxyandrostenedione to 19-oxoandrostenedione (19-oxidase activity), in the reconstituted system consisting of NADPH, NADPH:adrenodoxin reductase, and adrenodoxin. The turnover numbers (mol of product formed/min/mol of P-450) were 1.2 for the 11-oxidase activity and 1.4 for the 19-oxidase activity. No reactions took place when any one of the electron-donating components were omitted either in the presence or in the absence of added NADP+. Likewise, rabbit antibody prepared against P-45011 beta immunoprecipitated the 11-oxidase activity with concomitant loss of deoxycorticosterone 11 beta-hydroxylase activity.

authors

Suhara K,Takeda K,Katagiri M

doi

10.1016/0006-291x(86)90920-4

subject

Has Abstract

pub_date

1986-04-14 00:00:00

pages

369-75

issue

1

eissn

0006-291X

issn

1090-2104

pii

0006-291X(86)90920-4

journal_volume

136

pub_type

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