Recent Advances in Small-Molecule Modulators Targeting IRE1α.

Area of Science:

• Biochemistry
• Molecular Biology
• Pharmacology

Background:

• Inositol-requiring enzyme 1 alpha (IRE1α) is a key endoplasmic reticulum (ER) stress sensor with dual kinase and ribonuclease functions.
• IRE1α is critical for maintaining ER proteostasis and its dysregulation is implicated in various human diseases.
• Targeting IRE1α represents a promising therapeutic strategy.

Purpose of the Study:

• To review recent advancements in small molecule modulators of IRE1α.
• To provide insights into the mechanisms of IRE1α modulation.
• To discuss the future development of chemical modalities targeting IRE1α.

Main Methods:

• Summary of recent literature on IRE1α inhibitors, activators, and bifunctional molecules.
• Analysis of small molecule binding sites (RNase and kinase domains).
• Review of proteolysis targeting chimeras (PROTACs) for IRE1α degradation.

Main Results:

• Small molecules can modulate IRE1α RNase activity by directly inhibiting the RNase domain or allosterically via the kinase domain.
• Various monovalent inhibitors and activators have been identified.
• PROTACs offer a strategy to degrade IRE1α via the ubiquitin-proteasome system.

Conclusions:

• Small molecule targeting of IRE1α is a rapidly advancing field with significant therapeutic potential.
• Diverse chemical modalities, including inhibitors, activators, and degraders, are being developed.
• Further research into these chemical strategies may lead to novel treatments for IRE1α-associated diseases.