Publication Date:
1998-07-04
Description:
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.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Iwata, S -- Lee, J W -- Okada, K -- Lee, J K -- Iwata, M -- Rasmussen, B -- Link, T A -- Ramaswamy, S -- Jap, B K -- New York, N.Y. -- Science. 1998 Jul 3;281(5373):64-71.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Life Sciences Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, CA 94720, USA. iwata@xray.bmc.uu.se〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9651245" target="_blank"〉PubMed〈/a〉
Keywords:
Amino Acid Sequence
;
Animals
;
Binding Sites
;
Cattle
;
Crystallization
;
Crystallography, X-Ray
;
Cytochrome b Group/chemistry/metabolism
;
Cytochromes c1/chemistry/metabolism
;
Electron Transport
;
Electron Transport Complex III/*chemistry/metabolism
;
Enzyme Inhibitors/metabolism
;
Hydrogen Bonding
;
Hydroquinones/metabolism
;
Intracellular Membranes/enzymology
;
Iron-Sulfur Proteins/chemistry/metabolism
;
Methacrylates
;
Mitochondria, Heart/*enzymology
;
Models, Molecular
;
Molecular Sequence Data
;
Oxidation-Reduction
;
*Protein Conformation
;
Protein Structure, Secondary
;
Thiazoles/metabolism
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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