Adrenodoxin supports reactions catalyzed by microsomal steroidogenic cytochrome P450s.

Abstract:

:The interaction of adrenodoxin (Adx) and NADPH cytochrome P450 reductase (CPR) with human microsomal steroidogenic cytochrome P450s was studied. It is found that Adx, mitochondrial electron transfer protein, is able to support reactions catalyzed by human microsomal P450s: full length CYP17, truncated CYP17, and truncated CYP21. CPR, but not Adx, supports activity of truncated CYP19. Truncated and the full length CYP17s show distinct preference for electron donor proteins. Truncated CYP17 has higher activity with Adx compared to CPR. The alteration in preference to electron donor does not change product profile for truncated enzymes. The electrostatic contacts play a major role in the interaction of truncated CYP17 with either CPR or Adx. Similarly electrostatic contacts are predominant in the interaction of full length CYP17 with Adx. We speculate that Adx might serve as an alternative electron donor for CYP17 at the conditions of CPR deficiency in human.

authors

Pechurskaya TA,Harnastai IN,Grabovec IP,Gilep AA,Usanov SA

doi

10.1016/j.bbrc.2006.12.047

subject

Has Abstract

pub_date

2007-02-16 00:00:00

pages

598-604

issue

3

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(06)02713-6

journal_volume

353

pub_type

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