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Non-Canonical, Strongly Selective Protein Disulfide Isomerases as Anticancer Therapeutic Targets
Mary E Law1, Zaafir M Dulloo2, Brian Hardy1
1Department of Pharmacology & Therapeutics, University of Florida, Gainesville, FL 32610, USA.
Non-canonical Protein Disulfide Isomerases (PDIs), including ERp44, AGR2, and AGR3, are crucial for cancer cell survival. Inhibitors targeting these non-canonical PDIs show promise as novel anticancer therapeutics.
Area of Science:
- Biochemistry
- Molecular Biology
- Cancer Research
Background:
- Protein Disulfide Isomerases (PDIs) are key to protein folding, with canonical PDIs (e.g., PDIA1) extensively studied.
- Non-canonical PDIs, featuring CXXS active sites, are less understood but vital for protein folding quality control in the secretory pathway.
Purpose of the Study:
- To review the literature on non-canonical PDIs ERp44, AGR2, and AGR3.
- To highlight their roles in cancer subtypes and potential as therapeutic targets.
Main Methods:
- Literature review focusing on ERp44, AGR2, and AGR3.
- Analysis of DepMap database for cancer dependencies.
- Discussion of biological and biochemical functions.
Main Results:
- ERp44 is implicated in two protein folding quality control mechanisms.
- AGR2 acts as a specific sensor for mucin misfolding.
- AGR3 has a unique function related to cilia.
Conclusions:
- Non-canonical PDIs ERp44, AGR2, and AGR3 are essential in specific cancers.
- Developing small molecule inhibitors for these PDIs represents a promising anticancer therapeutic strategy.
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