Decay of endoplasmic reticulum-localized mRNAs during the unfolded protein response.
The unfolded protein response (UPR) allows the endoplasmic reticulum (ER) to recover from the accumulation of misfolded proteins, in part by increasing its folding capacity. Inositol-requiring enzyme-1 (IRE1) promotes this remodeling by detecting misfolded ER proteins and activating a transcription factor, X-box-binding protein 1, through endonucleolytic cleavage of its messenger RNA (mRNA). Here, we report that IRE1 independently mediates the rapid degradation of a specific subset of mRNAs, based both on their localization to the ER membrane and on the amino acid sequence they encode. This response is well suited to complement other UPR mechanisms because it could selectively halt production of proteins that challenge the ER and clear the translocation and folding machinery for the subsequent remodeling process.
Hollien
Julie
J
Department of Cellular and Molecular Pharmacology, University of California San Francisco, Howard Hughes Medical Institute, San Francisco, CA 94143, USA.
Weissman
Jonathan S
JS
D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002460:Cell Line; D004268:DNA-Binding Proteins / Q000378:metabolism; D004229:Dithiothreitol / Q000494:pharmacology; D015536:Down-Regulation; D029721:Drosophila Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D004331:Drosophila melanogaster / Q000235:genetics / Q000378:metabolism; D004721:Endoplasmic Reticulum / Q000378:metabolism*; D004722:Endoribonucleases / Q000235:genetics / Q000378:metabolism*; D005095:Exoribonucleases / Q000235:genetics / Q000378:metabolism; D005786:Gene Expression Regulation; D017344:Genes, Insect; D008565:Membrane Proteins / Q000235:genetics / Q000378:metabolism*; D008969:Molecular Sequence Data; D009154:Mutation; D020411:Oligonucleotide Array Sequence Analysis; D014176:Protein Biosynthesis; D017510:Protein Folding; D021382:Protein Sorting Signals; D020871:RNA Stability; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism*; D000071701:Regulatory Factor X Transcription Factors; D014157:Transcription Factors / Q000378:metabolism; D014158:Transcription, Genetic
D004268:DNA-Binding Proteins; D029721:Drosophila Proteins; D008565:Membrane Proteins; D021382:Protein Sorting Signals; D012333:RNA, Messenger; D000071701:Regulatory Factor X Transcription Factors; D014157:Transcription Factors; D004722:Endoribonucleases; D005095:Exoribonucleases; C511918:inositol requiring enzyme-1, Drosophila; C487208:pcm protein, Drosophila; D004229:Dithiothreitol