Complete structure of the 11-subunit bovine mitochondrial cytochrome bc1 complex

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

Research output: Contribution to journalArticlepeer-review

1081 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)64-71
Number of pages8
Issue number5373
StatePublished - Jul 3 1998
Externally publishedYes


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