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• W2034705156 abstract "Mammalian transcription factor ATF6 is constitutively synthesized as a type II transmembrane protein embedded in the endoplasmic reticulum (ER). Upon ER stress ATF6 is transported to the Golgi apparatus where it is cleaved to release its cytoplasmic domain. This is then translocated into the nucleus where it activates transcription of ER-localized molecular chaperones and folding enzymes to maintain the homeostasis of the ER. We recently found that, owing to the presence of intra- and intermolecular disulfide bridges, ATF6 occurs in unstressed ER in monomer, dimer and oligomer forms. Disulfide-bonded ATF6 is reduced on treatment of cells with various chemical ER stress inducers, and only the reduced monomer ATF6 reaches the Golgi apparatus. In this study, we evoked ER stress under more physiological conditions, namely, glucose starvation, and analyzed its consequence for ATF6 activation. Glucose starvation activated ATF6 and induced the ER chaperone BiP, albeit weakly. ATF6 was thus dissociated from BiP, transported to the Golgi apparatus, and cleaved. Glucose starvation enhanced the synthesis of ATF6 approximately two-fold, probably via transcriptional induction. Importantly, reduction of disulfide bridges and transport of reduced monomer occurred in response to glucose starvation. We conclude that ER stress-induced reduction of ATF6 represents a general feature of the ATF6 activation process." @default.
• W2034705156 created "2016-06-24" @default.
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• W2034705156 date "2006-01-01" @default.
• W2034705156 modified "2023-09-25" @default.
• W2034705156 title "Reduction of Disulfide Bridges in the Lumenal Domain of ATF6 in Response to Glucose Starvation" @default.
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• W2034705156 doi "https://doi.org/10.1247/csf.06024" @default.
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