Phosphorylation switches protein disulfide isomerase activity to maintain proteostasis and attenuate ER stress
Autor: | Jizhong Lou, Yu Liu, Jiaojiao Yu, Jianchao Zhang, Likun Wang, Tao Li, Xi Wang, Chih-chen Wang, Lei Wang, Guizhi Shi, Xi'e Wang |
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Jazyk: | angličtina |
Rok vydání: | 2020 |
Předmět: |
Male
Models Molecular inorganic chemicals Protein Conformation Procollagen-Proline Dioxygenase Protein Disulfide-Isomerases Biology Protein Serine-Threonine Kinases General Biochemistry Genetics and Molecular Biology 03 medical and health sciences Mice 0302 clinical medicine Endoribonucleases Animals Humans News & Views Phosphorylation Protein disulfide-isomerase Molecular Biology Secretory pathway 030304 developmental biology 0303 health sciences Extracellular Matrix Proteins General Immunology and Microbiology Casein Kinase I General Neuroscience Endoplasmic reticulum Hep G2 Cells Articles Endoplasmic Reticulum Stress Cell biology Proteostasis Foldase Unfolded protein response Unfolded Protein Response Protein folding Female 030217 neurology & neurosurgery HeLa Cells |
Zdroj: | EMBO J |
Popis: | Accumulated unfolded proteins in the endoplasmic reticulum (ER) trigger the unfolded protein response (UPR) to increase ER protein folding capacity. ER proteostasis and UPR signaling need to be regulated in a precise and timely manner. Here, we identify phosphorylation of protein disulfide isomerase (PDI), one of the most abundant and critical folding catalysts in the ER, as an early event during ER stress. The secretory pathway kinase Fam20C phosphorylates Ser357 of PDI and responds rapidly to various ER stressors. Phosphorylation of Ser357 induces an open conformation of PDI and turns it from a "foldase" into a "holdase", which is critical for preventing protein misfolding in the ER. Phosphorylated PDI also binds to the lumenal domain of IRE1α, a major UPR signal transducer, and attenuates excessive IRE1α activity. Importantly, PDI-S359A knock-in mice display enhanced IRE1α activation and liver damage under acute ER stress. We conclude that the Fam20C-PDI axis constitutes a post-translational response to maintain ER proteostasis and plays a vital role in protecting against ER stress-induced cell death. |
Databáze: | OpenAIRE |
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