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Science 3 July 1998:
Vol. 281. no. 5373, pp. 64 - 71
DOI: 10.1126/science.281.5373.64

Research Articles

Complete Structure of the 11-Subunit Bovine Mitochondrial Cytochrome bc1 Complex

So Iwata, * Joong W. Lee, Kengo Okada, dagger John Kyongwon Lee, Momi Iwata, Bjarne Rasmussen, Thomas A. Link, S. Ramaswamy, Bing K. Jap *

Mitochondrial cytochrome bc1 complex performs two functions: It is a respiratory multienzyme complex and it recognizes a mitochondrial targeting presequence. Refined crystal structures of the 11-subunit bc1 complex from bovine heart reveal full views of this bifunctional enzyme. The "Rieske" iron-sulfur protein subunit shows significant conformational changes in different crystal forms, suggesting a new electron transport mechanism of the enzyme. The mitochondrial targeting presequence of the "Rieske" protein (subunit 9) is lodged between the two "core" subunits at the matrix side of the complex. These "core" subunits are related to the matrix processing peptidase, and the structure unveils how mitochondrial targeting presequences are recognized.

J. W. Lee, J. K. Lee, and B. K. Jap are in the Life Sciences Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, CA 94720, USA. S. Iwata, K. Okada, and M. Iwata are in the Department of Biochemistry, Uppsala University, BMC, Box , Uppsala S-75123, Sweden. S. Ramaswamy is in the Department of Molecular Biology, Swedish Agricultural Science University, Box , Biomedical Center, Uppsala S-75124, Sweden. T. A. Link is at Uniklinikum Frankfurt, ZBC, Biochemie I, Molecular Bioenergetics, D-60590 Frankfurt/Main, Germany. B. Rasmussen is at the Grenoble Outstation, European Molecular Biology Laboratory, c/o Institut Laue-Langevin, Boîte Postale 156, F-38042 Grenoble Cedex 9, France.
*   To whom correspondence should be addressed. E-mail: BKJap{at}lbl.gov (B.K.J.) or iwata{at}xray.bmc.uu.se (S.I.)

dagger    Present address: Nara Institute of Science and Technology, Division of Structural Biology, Department of Molecular Biology, Graduate School of Biological Sciences, 8916-5 Takayama, Ikoma, Nara 630-0101, Japan.


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