The ND2 subunit is labeled by a photoaffinity analogue of asimicin, a potent complex I inhibitor |
| |
Authors: | Eiko Nakamaru-Ogiso Hongna Han Ehud Keinan Takao Yagi |
| |
Institution: | a Department of Molecular and Experimental Medicine, The Scripps Research Institute, La Jolla, CA 92037, USA b Johnson Research Foundation, Department of Biochemistry and Biophysics, School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA c Molecular Biology, The Scripps Research Institute, La Jolla, CA 92037, USA |
| |
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. |
| |
Keywords: | BN-PAGE blue native-PAGE BPA benzophenone-asimicin 1-D one-dimensional 2-D two-dimensional 3-D three-dimensional IC50 the molar concentration of substance that provides 50% inhibition of the control NADH oxidase activity Q quinone SMP submitochondrial particles SQ semiquinone [125I]TDA [125I](trifluoromethyl)phenyldiazirinylacetogenin |
本文献已被 ScienceDirect 等数据库收录! |
|