ArticleLife science alliance2026
Metabolite import by SLC33A1 is required for ATF6 activation during endoplasmic reticulum stress.
Article in Life science alliance, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
The transcription factor ATF6α has a central role in adapting mammalian cells to ER stress via the unfolded protein response (UPR), prompting efforts to identify ATF6α modulators. Here, an unbiased genome-wide CRISPR-Cas9 screen performed in Chinese Hamster Ovary cells revealed that proteolytic processing of the ATF6α precursor to its active form was impaired in cells lacking the ER-resident solute carrier SLC33A1, a transporter previously implicated in acetyl-CoA import, sialylation, and Nε-lysine protein acetylation. Cells lacking SLC33A1 constitutively trafficked the ATF6α to the Golgi but exhibited impaired Golgi processing and activating proteolysis. IRE1α signalling was derepressed by SLC33A1 deficiency consistent with selective loss of ATF6α-mediated negative feedback in the UPR.
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