A carboxyl-terminal hydrophobic region of yeast cytochrome c1 is necessary for functional assembly into complex III of the respiratory chain.

A carboxyl-terminal hydrophobic region of yeast cytochrome c1 is necessary for functional assembly into complex III of the respiratory chain. Research Abstract Details 

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A carboxyl-terminal hydrophobic region of yeast cytochrome c1 is necessary for functional assembly into complex III of the respiratory chain. Abstract Text:

T Hase,M Harabayashi,K Kawai,H Matsubara,

Cytochrome c1 is an amphiphilic protein which binds to the mitochondrial inner membrane, presumably through a hydrophobic region near the carboxyl (C)-terminus. In the preceding study (Hase, T., et al. (1987) J. Biochem. 102, 401-410), two cytochrome c1 mutations were constructed: delta 1 and delta 2 cytochromes c1, in which the C-terminal segments of 17 and 71 residues were replaced by foreign sequences of 20 and 15 residues, respectively. delta 2 cytochrome c1 had lost the putative membrane anchor. The two cytochrome c1 mutants were localized in mitochondria, but succinate-cytochrome c1 reductase activity was detected only in the mitochondria containing delta 1 cytochrome c1. The membrane association of the two mutant molecules as well as that of authentic cytochrome c1 was investigated. These three molecules were firmly attached to mitochondrial membranes and not solubilized on either sonication or sodium carbonate (pH 11) treatment. However, when the membranes were solubilized with Triton X-100, both the delta 1 and authentic cytochromes c1 were extracted from the membranes more easily than delta 2 cytochrome c1. By fractionating cholate extracts of mitochondrial membranes with ammonium sulfate, delta 1 cytochrome c1 was cofractionated with the enzymatic activity of complex III, but delta 2 cytochrome c1 was clearly separated from the complex III fraction. Trypsin treatment of mitochondria and mitoplasts showed that delta 2 cytochrome c1 was exposed to the intermembrane space, with such a topology that its trypsin susceptibility became much higher than that of the authentic molecule.(ABSTRACT TRUNCATED AT 250 WORDS)

A carboxyl-terminal hydrophobic region of yeast cytochrome c1 is necessary for functional assembly into complex III of the respiratory chain. Publishing Authors By Initials

T Hase,M Harabayashi,K Kawai,H Matsubara,

For similar cells: cellular structures: intracellular space: cytoplasm: cytoplasmic structures: organelles: mitochondria: submitochondrial particles research abstracts see: cells: cellular structures: intracellular space: cytoplasm: cytoplasmic structures: organelles: mitochondria: submitochondrial particles research

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A carboxyl-terminal hydrophobic region of yeast cytochrome c1 is necessary for functional assembly into complex III of the respiratory chain. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Journal of biochemistry

VOLUME: 102

Page Numbers: 411-9

Journal Abbreviation: J. Biochem.

ISSN: 0021-924X

DAY: 19

MONTH: Aug

YEAR: 1987

A carboxyl-terminal hydrophobic region of yeast cytochrome c1 is necessary for functional assembly into complex III of the respiratory chain. Information

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LANGUAGE: eng

NlmUniqueID: 376600

A carboxyl-terminal hydrophobic region of yeast cytochrome c1 is necessary for functional assembly into complex III of the respiratory chain. Keywords Mesh Terms:

KEYWORDS: Submitochondrial Particles

MESH TERMS: metabolism

Chemical & Substance for Abstract: A carboxyl-terminal hydrophobic region of yeast cytochrome c1 is necessary for functional assembly into complex III of the respiratory chain. Information

Substance Name: Electron Transport Complex III

Registry Number: EC 1.10.2.2

Grant and Affiliation Information for A carboxyl-terminal hydrophobic region of yeast cytochrome c1 is necessary for functional assembly into complex III of the respiratory chain.

AFFILIATION: Department of Biology, Faculty of Science, Osaka University.

Country: JAPAN

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MEDLINETA: J Biochem

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