Molecular chaperones Hsp90 and Hsp70 deliver preproteins to the mitochondrial import receptor Tom70
Open accessAbstract
The role of cytosolic factors in protein targeting to mitochondria is poorly understood. Here, we show that in mammals, the cytosolic chaperones Hsp90 and Hsp70 dock onto a specialized TPR domain in the import receptor Tom70 at the outer mitochondrial membrane. This interaction serves to deliver a set of preproteins to the receptor for subsequent membrane translocation dependent on the Hsp90 ATPase. Disruption of the chaperone/Tom70 recognition inhibits the import of these preproteins into mitochondria. In yeast, Hsp70 rather than Hsp90 is used in import, and Hsp70 docking is required for the formation of a productive preprotein/Tom70 complex. We outline a novel mechanism in which chaperones are recruited for a specific targeting event by a membrane-bound receptor.
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HSP70 and HSP90 are chaperones that interact with the outer mitochondrial membrane, stabilizing the unfolded state of nascent proteins and preventing aggregation, and are required for transport of proteins into mitochondria through Tom70.
“Heat shock protein 70 (HSP70) and heat shock protein 90 (HSP90) are chaperones that interact with the outer mitochondrial membrane, stabilizing the unfolded state of the nascent proteins and thereby preventing aggregation, and they are required for transport of the protein into mitochondria through the translocase Tom70 [80].”
From Mitochondrial Oxidative and Nitrosative Stress and Alzheimer Disease (2020) · cites this paper as [80]
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“stabilizing the unfolded state of the nascent proteins and thereby preventing aggregation, and they are required for transport of the protein into mitochondria through the translocase Tom70 [80].”
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- Authors
- Young, J. C., Hoogenraad, N. J., & Hartl, F. U.
- Affiliations
- Max Planck Institute of Biochemistry (DE)
- La Trobe University (AU)
- Corresponding author
- Hartl, F.Ulrich
- Venue
- Cell
- Publisher
- Elsevier BV
- Published
- 2003-01
- Volume
- 112
- Issue
- 1
- Pages
- 41-50
- ISSN
- 0092-8674 (ISSN-L)
- OpenAlex
- W2067511286
- Cited by
- 915
- References
- 40
- Citations by year
- 2026: 34 · 2025: 51 · 2024: 37 · 2023: 37 · 2022: 39 · 2021: 41 · 2020: 41 · 2019: 31 · 2018: 32 · 2017: 30 · 2016: 33 · 2015: 34 · 2014: 32 · 2013: 46 · 2012: 57
- FWCI
- 13.90
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Cell (publishedVersion, cc-by-nc-nd)
- PubMed (publishedVersion)
- Max Planck Institute for Plasma Physics (submittedVersion)
- MPG.PuRe (Max Planck Society) (submittedVersion)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Heat shock proteins research
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › ATP Synthase and ATPases Research
- Keywords
- HSP90, HSP70, Tom70, mitochondrial protein import, TPR domain, molecular chaperones, mitochondrial outer membrane, cytosolic chaperones, yeast mitochondria
- MeSH terms
- Mitochondrial Precursor Protein Import Complex Proteins, Adenosine Triphosphatases, Animals, Biological Transport, Active, Cytosol, Fungal Proteins, Humans, Membrane Proteins, Mitochondria, Models, Biological, Protein Binding, Protein Precursors, Receptors, Cell Surface, Saccharomyces cerevisiae, HSP70 Heat-Shock Proteins, HSP90 Heat-Shock Proteins, COS Cells, Amino Acid Substitution, Saccharomyces cerevisiae Proteins, Mitochondrial Membrane Transport Proteins, Rats
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