Structure of the mitochondrial import gate reveals distinct preprotein paths.Araiso, Y., Tsutsumi, A., Qiu, J., Imai, K., Shiota, T., Song, J., Lindau, C., Wenz, L.S., Sakaue, H., Yunoki, K., Kawano, S., Suzuki, J., Wischnewski, M., Schutze, C., Ariyama, H., Ando, T., Becker, T., Lithgow, T., Wiedemann, N., Pfanner, N., Kikkawa, M., Endo, T.
(2019) Nature --: --
- PubMed: 31600774
- DOI: 10.1038/s41586-019-1680-7
- PubMed Abstract:
The translocase of the outer mitochondrial membrane (TOM) is the main entry gate for proteins <sup>1-4 </sup>. Here we use cryo-electron microscopy to report the structure of the yeast TOM core complex <sup>5-9 </sup> at 3.8 Å resolution. The structu ...
The translocase of the outer mitochondrial membrane (TOM) is the main entry gate for proteins 1-4 . Here we use cryo-electron microscopy to report the structure of the yeast TOM core complex 5-9 at 3.8 Å resolution. The structure reveals the high-resolution architecture of the translocator consisting of two Tom40 β-barrel channels and α-helical transmembrane subunits, providing insight into critical features conserved in all eukaryotes 1-3 . Each Tom40 β-barrel is surrounded by small Tom subunits, and tethered by two Tom22 and one phospholipid. The N-terminal extension of Tom40 forms a helix inside the channel; mutational analysis reveals its dual role in early and late steps in biogenesis of intermembrane-space proteins in cooperation with Tom5. Each Tom40 channel possesses two precursor exit sites: Tom22, Tom40 and Tom7 guide presequence-containing preproteins to the exit in the midst of the dimer, whereas Tom5 and the Tom40 N-extension guide presequence-less preproteins to the exit at the dimer periphery.
Institute for Protein Dynamics, Kyoto Sangyo University, Kamigamo-motoyama, Kita-ku, Kyoto, Japan. email@example.com.,Nano Life Science Institute (WPI-Nano LSI), Kanazawa University, Kakuma-machi, Kanazawa, Japan.,Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, Freiburg, Germany.,Department of Clinical Laboratory Science, Division of Health Sciences, Graduate School of Medical Science, Kanazawa University, 5-11-80 Kodatsuno, Kanazawa, Ishikawa, Japan.,Molecular Profiling Research Center for Drug Discovery (molprof), National Institute of Advanced Industrial Science and Technology (AIST), 2-4-7 Aomi, Koto-ku, Tokyo, Japan.,Institute for Protein Dynamics, Kyoto Sangyo University, Kamigamo-motoyama, Kita-ku, Kyoto, Japan.,Sanofi Deutschland GmbH, Frankfurt am Main, Germany.,Organization for Promotion of Tenure Track, University of Miyazaki, 1-1 Gakuenkibanadai-nishi, Miyazaki, Japan.,Faculty of Life Sciences, Kyoto Sangyo University, Kamigamo-motoyama, Kita-ku, Kyoto, Japan. firstname.lastname@example.org.,Institute of Molecular Precision Medicine and Hunan Key Laboratory of Molecular Precision Medicine, Xiangya Hospital, Central South University, Changsha, Hunan, China.,Faculty of Life Sciences, Kyoto Sangyo University, Kamigamo-motoyama, Kita-ku, Kyoto, Japan.,Spemann Graduate School of Biology and Medicine, University of Freiburg, Freiburg, Germany.,Infection and Immunity Program, Biomedicine Discovery Institute and Department of Microbiology, Monash University, Melbourne, Victoria, Australia.,Department of Cell Biology and Anatomy, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, Japan.,Swiss Federal Institute of Technology (EPFL), Lausanne, Switzerland.,Faculty of Biology, University of Freiburg, Freiburg, Germany.,CIBSS Centre for Integrative Biological Signalling Studies, University of Freiburg, Freiburg, Germany.