Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 12240-12248 |
| Seitenumfang | 9 |
| Fachzeitschrift | Journal of Biological Chemistry |
| Jahrgang | 282 |
| Ausgabenummer | 16 |
| Publikationsstatus | Veröffentlicht - 23 Apr. 2007 |
Abstract
Mitochondrial respiratory chain complexes are arranged in supercomplexes within the inner membrane. Interaction of cytochrome c reductase (complex III) and cytochrome c oxidase (complex IV) was investigated in Saccharomyces cerevisiae. Projection maps at 15 Å resolution of supercomplexes III 2 + IV1 and III2 + IV2 were obtained by electron microscopy. Based on a comparison of our maps with atomic x-ray structures for complexes III and IV we present a pseudo-atomic model of their precise interaction. Two complex IV monomers are specifically attached to dimeric complex III with their convex sides. The opposite sides, which represent the complex IV dimer interface in the x-ray structure, are open for complex IV-complex IV interactions. This could lead to oligomerization of III 2 + IV2 supercomplexes, but this was not detected. Instead, binding of cytochrome c to the supercomplexes was revealed. It was calculated that cytochrome c has to move less than 40Å at the surface of the supercomplex for electron transport between complex III2 and complex IV. Hence, the prime function of the supercomplex III2 + IV2 is proposed to be a scaffold for effective electron transport between complexes III and IV.
ASJC Scopus Sachgebiete
- Biochemie, Genetik und Molekularbiologie (insg.)
- Biochemie
- Biochemie, Genetik und Molekularbiologie (insg.)
- Molekularbiologie
- Biochemie, Genetik und Molekularbiologie (insg.)
- Zellbiologie
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in: Journal of Biological Chemistry, Jahrgang 282, Nr. 16, 23.04.2007, S. 12240-12248.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - A Structural Model of the Cytochrome c Reductase/Oxidase Supercomplex from Yeast Mitochondria
AU - Heinemeyer, Jesco
AU - Braun, Hans Peter
AU - Boekema, Egbert J.
AU - Kouřil, Roman
PY - 2007/4/23
Y1 - 2007/4/23
N2 - Mitochondrial respiratory chain complexes are arranged in supercomplexes within the inner membrane. Interaction of cytochrome c reductase (complex III) and cytochrome c oxidase (complex IV) was investigated in Saccharomyces cerevisiae. Projection maps at 15 Å resolution of supercomplexes III 2 + IV1 and III2 + IV2 were obtained by electron microscopy. Based on a comparison of our maps with atomic x-ray structures for complexes III and IV we present a pseudo-atomic model of their precise interaction. Two complex IV monomers are specifically attached to dimeric complex III with their convex sides. The opposite sides, which represent the complex IV dimer interface in the x-ray structure, are open for complex IV-complex IV interactions. This could lead to oligomerization of III 2 + IV2 supercomplexes, but this was not detected. Instead, binding of cytochrome c to the supercomplexes was revealed. It was calculated that cytochrome c has to move less than 40Å at the surface of the supercomplex for electron transport between complex III2 and complex IV. Hence, the prime function of the supercomplex III2 + IV2 is proposed to be a scaffold for effective electron transport between complexes III and IV.
AB - Mitochondrial respiratory chain complexes are arranged in supercomplexes within the inner membrane. Interaction of cytochrome c reductase (complex III) and cytochrome c oxidase (complex IV) was investigated in Saccharomyces cerevisiae. Projection maps at 15 Å resolution of supercomplexes III 2 + IV1 and III2 + IV2 were obtained by electron microscopy. Based on a comparison of our maps with atomic x-ray structures for complexes III and IV we present a pseudo-atomic model of their precise interaction. Two complex IV monomers are specifically attached to dimeric complex III with their convex sides. The opposite sides, which represent the complex IV dimer interface in the x-ray structure, are open for complex IV-complex IV interactions. This could lead to oligomerization of III 2 + IV2 supercomplexes, but this was not detected. Instead, binding of cytochrome c to the supercomplexes was revealed. It was calculated that cytochrome c has to move less than 40Å at the surface of the supercomplex for electron transport between complex III2 and complex IV. Hence, the prime function of the supercomplex III2 + IV2 is proposed to be a scaffold for effective electron transport between complexes III and IV.
UR - http://www.scopus.com/inward/record.url?scp=34249688217&partnerID=8YFLogxK
U2 - 10.1074/jbc.M610545200
DO - 10.1074/jbc.M610545200
M3 - Article
C2 - 17322303
AN - SCOPUS:34249688217
VL - 282
SP - 12240
EP - 12248
JO - Journal of Biological Chemistry
JF - Journal of Biological Chemistry
SN - 0021-9258
IS - 16
ER -