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. 2020 Apr 20;12(5):e11845. doi: 10.15252/emmm.201911845

Figure 1. The three arms of the UPR pathways.

Figure 1

Accumulation of misfolded or unfolded proteins in the ER lumen activates the three UPR pathways initiated by PERK, IRE1α, and ATF6α. This leads to either the recovery of ER homeostasis by blocking protein translation and enhancing protein‐folding capacity and clearance of misfolded proteins, or apoptosis upon unresolved ER stress.