Abstract
To identify yeast cytosolic proteins that mediate targeting of precursor proteins to mitochondria, we developed an in vitro import system consisting of purified yeast mitochondria and a radiolabeled mitochondrial precursor protein whose C terminus was still attached to the ribosome. In this system, the N terminus of the nascent chain was translocated across both mitochondrial membranes, generating a translocation intermediate spanning both membranes. The nascent chain could then be completely chased into the mitochondrial matrix after release from the ribosome. Generation of this import intermediate was dependent on a mitochondrial membrane potential, mitochondrial surface proteins, and was stimulated by proteins that could be released from the ribosomes by high salt. The major salt-released stimulatory factor was yeast nascent polypeptide–associated complex (NAC). Purified NAC fully restored import of salt-washed ribosome-bound nascent chains by enhancing productive binding of the chains to mitochondria. We propose that ribosome-associated NAC facilitates recognition of nascent precursor chains by the mitochondrial import machinery.
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Dates
Type | When |
---|---|
Created | 12 years, 1 month ago (July 2, 2013, 7:19 p.m.) |
Deposited | 3 years, 5 months ago (Feb. 26, 2022, 9:37 p.m.) |
Indexed | 2 weeks, 5 days ago (Aug. 6, 2025, 9:22 a.m.) |
Issued | 25 years, 10 months ago (Oct. 1, 1999) |
Published | 25 years, 10 months ago (Oct. 1, 1999) |
Published Print | 25 years, 10 months ago (Oct. 1, 1999) |
@article{F_nfschilling_1999, title={Nascent Polypeptide–associated Complex Stimulates Protein Import into Yeast Mitochondria}, volume={10}, ISSN={1939-4586}, url={http://dx.doi.org/10.1091/mbc.10.10.3289}, DOI={10.1091/mbc.10.10.3289}, number={10}, journal={Molecular Biology of the Cell}, publisher={American Society for Cell Biology (ASCB)}, author={Fünfschilling, Ursula and Rospert, Sabine}, editor={Walter, Peter}, year={1999}, month=oct, pages={3289–3299} }