Transport of proteins into mitochondria: translocational intermediates spanning contact sites between outer and inner membranes
Autor: | Manfred Schleyer, Walter Neupert |
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Rok vydání: | 1985 |
Předmět: |
Translocase of the outer membrane
Cytochrome c Group Models Biological General Biochemistry Genetics and Molecular Biology Antibodies Membrane Potentials Mitochondrial membrane transport protein Cytochrome C1 Endopeptidases Inner membrane Protein Precursors Enzyme Precursors biology Neurospora crassa Temperature Metalloendopeptidases Biological Transport Intracellular Membranes Membrane transport Transmembrane protein Mitochondria Proton-Translocating ATPases Membrane Biochemistry Translocase of the inner membrane biology.protein Biophysics Endopeptidase K Protein Processing Post-Translational |
Zdroj: | Cell. 43(1) |
ISSN: | 0092-8674 |
Popis: | Translocational intermediates of precursor proteins of ATPase F1 beta subunit and cytochrome c1 across mitochondrial membranes were analyzed using two different approaches, transport at low temperature and transport after binding of precursor proteins to antibodies. Under both conditions precursors were partially transported into mitochondria in an energy-dependent manner. They were processed by the metalloprotease in the matrix but a major proportion of the polypeptide chains was still present at the outer face of the outer mitochondrial membrane. We conclude that transfer of precursors into the inner membrane or matrix space occurs through "translocation contact sites"; precursor polypeptides to F1 beta and cytochrome c1 enter the matrix space with the amino terminus first; and a membrane potential is required for the transmembrane movement on an amino-terminal "domain-like" structure but not for completing translocation of the major part of the polypeptides. |
Databáze: | OpenAIRE |
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