Chaperone-assisted E3 ligase CHIP: A double agent in cancer

Area of Science:

• Cellular Biology
• Biochemistry
• Oncology

Background:

• The carboxy-terminus of Hsp70-interacting protein (CHIP) functions as a ubiquitin ligase and co-chaperone.
• CHIP links molecular chaperones (HSC70, HSP70, HSP90) to the ubiquitin-proteasome system (UPS), maintaining cellular homeostasis.
• It plays a role in protein degradation pathways, cellular differentiation, proliferation, metastasis, and tumorigenesis.

Purpose of the Study:

• To review established CHIP substrates and classify them according to cancer hallmarks.
• To discuss CHIP's structure, expression, localization, and physiological roles.
• To explore CHIP's involvement in disease, tumor biology, and its potential as a therapeutic target in cancer therapy.

Main Methods:

• Literature review of established CHIP substrates.
• Classification of substrates based on cancer hallmarks.
• Discussion of CHIP's molecular mechanisms, roles in disease, and therapeutic potential.

Main Results:

• Compilation and classification of known CHIP substrates.
• Detailed discussion of CHIP's structural domains (TPR and Ubox) and their functions.
• Exploration of CHIP's dual role as a tumor suppressor and oncogene in various malignancies.

Conclusions:

• CHIP is a critical regulator of cellular homeostasis and protein degradation.
• CHIP's multifaceted roles in cancer highlight its significance in tumor biology.
• CHIP represents a promising drug target for pharmaceutical development in cancer therapy.