Inositol Requiring Enzyme (IRE), a multiplayer in sensing endoplasmic reticulum stress
Zhou, Zhixin | Wang, Qian | Michalak, Marek
The endoplasmic reticulum (ER) can sense a wide variety of external and internal perturbations and responds by mounting stress coping responses, such as the unfolded protein response (UPR). The UPR is composed of three stress sensors, namely IRE1α, PERK, and ATF6 that are activated to re-establish ER homeostasis. IRE1α represents the most ancient branch of the UPR affecting many cellular processes in plant and animal cells. IRE1α is a type I transmembrane protein with kinase/nuclease activities in response to ER stress. Both the ER luminal and cytosolic IRE1α interactomes have been identified revealing a multifunctional role of the ER stress sensor. IRE1α is also associated with organellar membrane contacts to promote rapid communication between intracellular organelles under stress conditions.
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