Journal
INTERNATIONAL REVIEWS OF IMMUNOLOGY
Volume 36, Issue 5, Pages 300-312Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/08830185.2017.1309528
Keywords
Ubiquitination; CHIP; chaperone; substrate; immune system
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Funding
- CAMS Innovation Fund for Medical Sciences [2016-I2M-1-003]
- National Science Foundation of China [81572625]
- Beijing Municipal Administration of Hospital' Youth Program [QML20161103]
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The carboxyl terminal of Hsp70-interacting protein (CHIP) is an E3 ubiquitin ligase that plays a pivotal role in the protein quality control system by shifting the balance of the folding-refolding machinery toward the degradative pathway. However, the precise mechanisms by which nonnative proteins are selected for degradation by CHIP either directly or indirectly via chaperone Hsp70 or Hsp90 are still not clear. In this review, we aim to provide a comprehensive model of the mechanism by which CHIP degrades its substrate in a chaperone-dependent or direct manner. In addition, through tight regulation of the protein level of its substrates, CHIP plays important roles in many physiological and pathological conditions, including cancers, neurological disorders, cardiac diseases, bone metabolism, immunity, and so on. Nonetheless, the precise mechanisms underlying the regulation of the immune system by CHIP are still poorly understood despite accumulating developments in our understanding of the regulatory roles of CHIP in both innate and adaptive immune responses. In this review, we also aim to provide a view of CHIP-mediated regulation of immune responses and the signaling pathways involved in the model described. Finally, we discuss the roles of CHIP in immune-related diseases.
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