Cited by 915Heat shock proteins researchMitochondrial Function and PathologyATP Synthase and ATPases Research

Molecular chaperones Hsp90 and Hsp70 deliver preproteins to the mitochondrial import receptor Tom70

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Young, Jason C., Hoogenraad, Nicholas J., Hartl, F.Ulrich·2003·Cell

Abstract

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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Crossref · 10.1016/s0092-8674(02)01250-3

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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].”

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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
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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