Crossref journal-article
Springer Science and Business Media LLC
EMBO reports (297)
Abstract

The ubiquitin–proteasome system catalyses the immediate destruction of misfolded or impaired proteins generated in cells, but how this proteolytic machinery recognizes abnormality of cellular proteins for selective elimination remains elusive. Here, we report that the C‐terminus of Hsc70‐interacting protein (CHIP) with a U‐box domain is an E3 ubiquitin‐ligase collaborating with molecular chaperones Hsp90 and Hsc70. Thermally denatured firefly luciferase was multiubiquitylated by CHIP in the presence of E1 and E2 (Ubc4 or UbcH5c) in vitro, only when the unfolded substrate was captured by Hsp90 or Hsc70 and Hsp40. No ubiquitylating activity was detected in CHIP lacking the U‐box region. CHIP efficiently ubiquitylated denatured luciferase trapped by the C‐terminal region of Hsp90, which contains a CHIP binding site. CHIP also showed self‐ubiquitylating activity independent of target ubiquitylation. Our results indicate that CHIP can be regarded as ‘a quality‐control E3’ that selectively ubiquitylates unfolded protein(s) by collaborating with molecular chaperones.

Bibliography

Murata, S., Minami, Y., Minami, M., Chiba, T., & Tanaka, K. (2001). CHIP is a chaperone‐dependent E3 ligase that ubiquitylates unfolded protein. EMBO Reports, 2(12), 1133–1138. Portico.

Authors 5
  1. Shigeo Murata (first)
  2. Yasufumi Minami (additional)
  3. Michiko Minami (additional)
  4. Tomoki Chiba (additional)
  5. Keiji Tanaka (additional)
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Dates
Type When
Created 23 years, 1 month ago (July 26, 2002, 6:19 p.m.)
Deposited 1 year, 8 months ago (Dec. 18, 2023, 3:55 p.m.)
Indexed 4 days, 19 hours ago (Aug. 27, 2025, 12:08 p.m.)
Issued 23 years, 9 months ago (Dec. 1, 2001)
Published 23 years, 9 months ago (Dec. 1, 2001)
Published Online 23 years, 9 months ago (Dec. 1, 2001)
Published Print 23 years, 9 months ago (Dec. 1, 2001)
Funders 0

None

@article{Murata_2001, title={CHIP is a chaperone‐dependent E3 ligase that ubiquitylates unfolded protein}, volume={2}, ISSN={1469-3178}, url={http://dx.doi.org/10.1093/embo-reports/kve246}, DOI={10.1093/embo-reports/kve246}, number={12}, journal={EMBO reports}, publisher={Springer Science and Business Media LLC}, author={Murata, Shigeo and Minami, Yasufumi and Minami, Michiko and Chiba, Tomoki and Tanaka, Keiji}, year={2001}, month=dec, pages={1133–1138} }