1. Elongin functions as a loading factor for Mediator at ATF6α-regulated ER stress response genes.
- Author
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He Y, Sato S, Tomomori-Sato C, Chen S, Goode ZH, Conaway JW, and Conaway RC
- Subjects
- Activating Transcription Factor 6 genetics, Animals, Elongin genetics, Endoplasmic Reticulum metabolism, Endoplasmic Reticulum pathology, HeLa Cells, Humans, Mediator Complex genetics, Promoter Regions, Genetic, RNA Polymerase II genetics, Rats, Signal Transduction, Transcriptional Activation, Activating Transcription Factor 6 metabolism, Elongin metabolism, Endoplasmic Reticulum Stress, Gene Expression Regulation, Mediator Complex metabolism, RNA Polymerase II metabolism
- Abstract
The bZIP transcription factor ATF6α is a master regulator of endoplasmic reticulum (ER) stress response genes. In this report, we identify the multifunctional RNA polymerase II transcription factor Elongin as a cofactor for ATF6α-dependent transcription activation. Biochemical studies reveal that Elongin functions at least in part by facilitating ATF6α-dependent loading of Mediator at the promoters and enhancers of ER stress response genes. Depletion of Elongin from cells leads to impaired transcription of ER stress response genes and to defects in the recruitment of Mediator and its CDK8 kinase subunit. Taken together, these findings bring to light a role for Elongin as a loading factor for Mediator during the ER stress response., Competing Interests: The authors declare no competing interest.
- Published
- 2021
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