unfolded protein response (upr)

How Does the UPR Work?

The UPR involves three primary signaling pathways, each initiated by a different sensor protein:
- PERK (Protein kinase RNA-like ER kinase)
- IRE1 (Inositol-requiring enzyme 1)
- ATF6 (Activating transcription factor 6)
Upon activation, these sensors trigger a cascade of events aimed at restoring normal function by:
1. Halting protein translation to reduce the load of new proteins entering the ER.
2. Upregulating the production of molecular chaperones that assist in protein folding.
3. Enhancing the degradation of misfolded proteins through the ER-associated degradation (ERAD) pathway.

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