The ND2 subunit is labeled by a photoaffinity analogue of asimicin, a potent complex I inhibitor
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Updated: Jun 17, 2026

In Vitro Transcription Assays and Their Application in Drug Discovery
Published on: September 20, 2016
Eiko Nakamaru-Ogiso1, Hongna Han, Akemi Matsuno-Yagi
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.
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