Letter | Published:

CHIP-mediated stress recovery by sequential ubiquitination of substrates and Hsp70

Nature volume 440, pages 551555 (23 March 2006) | Download Citation

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Abstract

Exposure of cells to various stresses often leads to the induction of a group of proteins called heat shock proteins (HSPs, molecular chaperones)1,2. Hsp70 is one of the most highly inducible molecular chaperones, but its expression must be maintained at low levels under physiological conditions to permit constitutive cellular activities to proceed3,4. Heat shock transcription factor 1 (HSF1) is the transcriptional regulator of HSP gene expression5, but it remains poorly understood how newly synthesized HSPs return to basal levels when HSF1 activity is attenuated. CHIP (carboxy terminus of Hsp70-binding protein), a dual-function co-chaperone/ubiquitin ligase, targets a broad range of chaperone substrates for proteasomal degradation6,7,8,9,10,11. Here we show that CHIP not only enhances Hsp70 induction during acute stress but also mediates its turnover during the stress recovery process. Central to this dual-phase regulation is its substrate dependence: CHIP preferentially ubiquitinates chaperone-bound substrates, whereas degradation of Hsp70 by CHIP-dependent targeting to the ubiquitin–proteasome system occurs when misfolded substrates have been depleted. The sequential catalysis of the CHIP-associated chaperone adaptor and its bound substrate provides an elegant mechanism for maintaining homeostasis by tuning chaperone levels appropriately to reflect the status of protein folding within the cytoplasm.

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Acknowledgements

We thank D. Thiele for critical reading of the manuscript. This work was supported by grants from the National Institutes of Health, the American Heart Association and the Burroughs Wellcome Fund.

Author information

Affiliations

  1. Carolina Cardiovascular Biology Center and

    • Shu-Bing Qian
    • , Holly McDonough
    • , Frank Boellmann
    •  & Cam Patterson
  2. Department of Cell and Developmental Biology, School of Medicine, University of North Carolina, Chapel Hill, North Carolina 27599, USA

    • Douglas M. Cyr

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Reprints and permissions information is available at npg.nature.com/reprintsandpermissions. The authors declare no competing financial interests.

Corresponding author

Correspondence to Cam Patterson.

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DOI

https://doi.org/10.1038/nature04600

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