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The Structure of Precursor Proteins during Import into Mitochondria

Precursor proteins must be at least partially unfolded during import into mitochondria, but their actual conformation during translocation is not known. Are proteins fully unfolded and threaded through the import machinery amino acid by amino acid, or do they retain some partial structure? The foldi...

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Bibliographic Details
Published in:The Journal of biological chemistry 1999-04, Vol.274 (18), p.12759-12764
Main Authors: Schwartz, M P, Huang, S, Matouschek, A
Format: Article
Language:English
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Summary:Precursor proteins must be at least partially unfolded during import into mitochondria, but their actual conformation during translocation is not known. Are proteins fully unfolded and threaded through the import machinery amino acid by amino acid, or do they retain some partial structure? The folding pathway of most proteins in vitro contains a partially folded intermediate known as the molten globule state, and it has been suggested that proteins are in the molten globule state during translocation across membranes. Here we show that precursors are normally fully unfolded during import into mitochondria. However, precursors containing residual structure can be imported, if less efficiently.
ISSN:0021-9258
1083-351X
DOI:10.1074/jbc.274.18.12759