NADH and NADPH-dependent reduction of coenzyme Q at the plasma membrane.

Abstract:

:High affinity for NADH, and low affinity for NADPH, for reduction of endogenous coenzyme Q10 (CoQ10) by pig liver plasma membrane is reported in the present work. CoQ reduction in plasma membrane is carried out, in addition to other mechanisms, by plasma membrane coenzyme Q reductase (PMQR). We show that PMQR-catalyzed reduction of CoQ0 by both NADH and NADPH is accompanied by generation of CoQ0 semiquinone radicals in a superoxide-dependent reaction. In the presence of a water-soluble vitamin E homologue, Trolox, this reduction leads to quenching of the Trolox phenoxyl radicals. The involvement of PMQR versus DT-diaphorase under the conditions of vitamin E and selenium sufficiency and deficiency was evaluated for CoQ reduction by plasma membranes. The data presented here suggest that both nucleotides (NADH and NADPH) can be accountable for CoQ reduction by PMQR on the basis of their physiological concentrations within the cell. The enzyme is primarily responsible for CoQ reduction in plasma membrane under normal (nonoxidative stress-associated) conditions.

journal_name

Antioxid Redox Signal

authors

Arroyo A,Kagan VE,Tyurin VA,Burgess JR,de Cabo R,Navas P,Villalba JM

doi

10.1089/ars.2000.2.2-251

keywords:

subject

Has Abstract

pub_date

2000-07-01 00:00:00

pages

251-62

issue

2

eissn

1523-0864

issn

1557-7716

journal_volume

2

pub_type

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