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Inositol‐requiring enzyme 1 (IRE1) is a conserved sensor of the unfolded protein response that has protein kinase and endoribonuclease (RNase) enzymatic activities and thereby initiates HAC1/XBP1 splicing. Previous studies demonstrated that human IRE1α (hIRE1α) does not cleave Saccharomyces cerevisiae HAC1 mRNA. Using an in vitro cleavage assay, we show that adenine to cytosine nucleotide substitution...
The unfolded protein response is a mechanism to cope with endoplasmic reticulum stress. In Saccharomyces cerevisiae, Ire1 senses the stress and mediates a signaling cascade to upregulate responsive genes through an unusual HAC1 mRNA splicing. The splicing requires interconnected activity (kinase and endoribonuclease (RNase)) of Ire1 to cleave HAC1 mRNA at the non-canonical splice sites before translation...
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