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FEBS Lett. 2010 Mar 5;584(5):883-8. doi: 10.1016/j.febslet.2010.01.004. Epub 2010 Jan 13.

The ND2 subunit is labeled by a photoaffinity analogue of asimicin, a potent complex I inhibitor.

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  • 1Department of Molecular and Experimental Medicine, The Scripps Research Institute, La Jolla, CA 92037, USA. eikoo@mail.med.upenn.edu

Abstract

NADH:ubiquinone oxidoreductase (complex I) is the entry enzyme of mitochondrial oxidative phosphorylation. To obtain the structural information on inhibitor/quinone binding sites, we synthesized [3H]benzophenone-asimicin ([3H]BPA), a photoaffinity analogue of asimicin, which belongs to the acetogenin family known as the most potent complex I inhibitor. We found that [3H]BPA was photo-crosslinked to ND2, ND1 and ND5 subunits, by the three dimensional separation (blue-native/doubled SDS-PAGE) of [3H]BPA-treated bovine heart submitochondrial particles. The cross-linking was blocked by rotenone. This is the first finding that ND2 was photo-crosslinked with a potent complex I inhibitor, suggesting its involvement in the inhibitor/quinone-binding.

Copyright (c) 2010 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.

PMID:
20074573
[PubMed - indexed for MEDLINE]
PMCID:
PMC2836797
Free PMC Article
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