APY29 is considered as a type I kinase inhibitor of inositol requiring kinase enzyme 1 α (IRE1α).[1]
Biochem/physiol Actions
APY29 has the ability to enhance inositol requiring kinase enzyme 1 α (IRE1α) (P830L)′s oligomeric state to rescue RNase activity.[1]
APY29 is a small molecule that inhibits the kinase activity of IRE1α (in vitro autophosphorylation IC50 = 280 nM) by targeting its active site ATP-binding pocket, while simultaneously acting as an allosteric activator of IRE1α RNase activity (EC50 = 460 nM) by keeping the active site in an open conformation. When applied 1 hr prior to stress induction by 4-hr 6 nM thapsigargin treatment, APY29 significantly potentiates stress-induced unfolded protein response (UPR) in rat insulinoma INS-1 cultures (XBP1 mRNA processing induction = 54% without vs. 78% with 1-hr 3 μM APY29 pretreatment).
ATP-competitive IRE1α kinase activity inhibitor and allosteric IRE1α RNase activity activator that enhances stress-induced unfolded protein response (UPR).
Ire1 is a signal transduction protein in the endoplasmic reticulum (ER) membrane that serves to adjust the protein-folding capacity of the ER according to the needs of the cell. Ire1 signals, in a transcriptional program, the unfolded protein response (UPR)
In response to the endoplasmic reticulum (ER) stress induced by herpes simplex virus type 1 (HSV-1) infection, host cells activate the unfolded protein response (UPR) to reduce the protein-folding burden in the ER. The regulation of UPR upon HSV-1 infection
Diets rich in saturated fatty acids (SFAs) produce a form of tissue inflammation driven by "metabolically activated" macrophages. We show that SFAs, when in excess, induce a unique transcriptional signature in both mouse and human macrophages that is enriched by
Nature chemical biology, 8(12), 982-989 (2012-10-23)
Under endoplasmic reticulum stress, unfolded protein accumulation leads to activation of the endoplasmic reticulum transmembrane kinase/endoRNase (RNase) IRE1α. IRE1α oligomerizes, autophosphorylates and initiates splicing of XBP1 mRNA, thus triggering the unfolded protein response (UPR). Here we show that IRE1α's kinase-controlled
Allosteric inhibition of the IRE1alpha RNase preserves cell viability and function during endoplasmic reticulum stress
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