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NADH oxidation drives respiratory Na(+) transport in mitochondria from Yarrowia lipolytica


Lin, P C; Puhar, A; Steuber, J (2008). NADH oxidation drives respiratory Na(+) transport in mitochondria from Yarrowia lipolytica. Archives of Microbiology, 190(4):471-480.

Abstract

It is generally assumed that respiratory complexes exclusively use protons to energize the inner mitochondrial membrane. Here we show that oxidation of NADH by submitochondrial particles (SMPs) from the yeast Yarrowia lipolytica is coupled to protonophore-resistant Na(+) uptake, indicating that a redox-driven, primary Na(+) pump is operative in the inner mitochondrial membrane. By purification and reconstitution into proteoliposomes, a respiratory NADH dehydrogenase was identified which coupled NADH-dependent reduction of ubiquinone (1.4 mumol min(-1) mg(-1)) to Na(+) translocation (2.0 mumol min(-1) mg(-1)). NADH-driven Na(+) transport was sensitive towards rotenone, a specific inhibitor of complex I. We conclude that mitochondria from Y. lipolytica contain a NADH-driven Na(+) pump and propose that it represents the complex I of the respiratory chain. Our study indicates that energy conversion by mitochondria does not exclusively rely on the proton motive force but may benefit from the electrochemical Na(+) gradient established by complex I.

It is generally assumed that respiratory complexes exclusively use protons to energize the inner mitochondrial membrane. Here we show that oxidation of NADH by submitochondrial particles (SMPs) from the yeast Yarrowia lipolytica is coupled to protonophore-resistant Na(+) uptake, indicating that a redox-driven, primary Na(+) pump is operative in the inner mitochondrial membrane. By purification and reconstitution into proteoliposomes, a respiratory NADH dehydrogenase was identified which coupled NADH-dependent reduction of ubiquinone (1.4 mumol min(-1) mg(-1)) to Na(+) translocation (2.0 mumol min(-1) mg(-1)). NADH-driven Na(+) transport was sensitive towards rotenone, a specific inhibitor of complex I. We conclude that mitochondria from Y. lipolytica contain a NADH-driven Na(+) pump and propose that it represents the complex I of the respiratory chain. Our study indicates that energy conversion by mitochondria does not exclusively rely on the proton motive force but may benefit from the electrochemical Na(+) gradient established by complex I.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > Department of Biochemistry
07 Faculty of Science > Department of Biochemistry
Dewey Decimal Classification:570 Life sciences; biology
Language:English
Date:October 2008
Deposited On:23 Sep 2008 07:05
Last Modified:05 Apr 2016 12:28
Publisher:Springer
ISSN:0302-8933
Additional Information:The original publication is available at www.springerlink.com
Publisher DOI:10.1007/s00203-008-0395-1
PubMed ID:18551278
Permanent URL: http://doi.org/10.5167/uzh-3900

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