The dimensions of the protein import channels in the outer and inner mitochondrial membranes
Author(s) -
Michael P. Schwartz,
Andreas Matouschek
Publication year - 1999
Publication title -
proceedings of the national academy of sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.011
H-Index - 771
eISSN - 1091-6490
pISSN - 0027-8424
DOI - 10.1073/pnas.96.23.13086
Subject(s) - translocase of the inner membrane , inner membrane , translocase of the outer membrane , inner mitochondrial membrane , membrane , bacterial outer membrane , biophysics , mitochondrial carrier , transmembrane protein , mitochondrial membrane transport protein , mitochondrion , chemistry , membrane protein , microbiology and biotechnology , biology , biochemistry , receptor , escherichia coli , gene
Most mitochondrial proteins are imported into mitochondria through transmembrane channels composed largely, and perhaps exclusively, of proteins. We have determined the effective internal diameter of the protein import channel in the mitochondrial outer membrane to be between 20 A and 26 A during translocation. The diameter of the import channel in the inner membrane is smaller than the diameter of the outer membrane import channel. These results were obtained by measuring the effect of rigid steric bulk introduced into precursor proteins on import.
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