1. AMP-activated protein kinase phosphorylates CtBP1 and down-regulates its activity
- Author
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Eun Jung Cho, Byung Hee Kang, Soon Min Lee, Gum Yong Kang, Jae Hwan Kim, Soo Youn Choi, Hyung Soon Park, Joo Young Bang, and Hong Duk Youn
- Subjects
Programmed cell death ,Transcription, Genetic ,Biophysics ,AMP-Activated Protein Kinases ,Biochemistry ,CTBP1 ,AMP-activated protein kinase ,Serine ,Humans ,Phosphorylation ,Protein kinase A ,Molecular Biology ,bcl-2-Associated X Protein ,Regulation of gene expression ,biology ,Cell growth ,Ubiquitination ,AMPK ,Cell Biology ,Cell biology ,DNA-Binding Proteins ,Enzyme Activation ,Alcohol Oxidoreductases ,HEK293 Cells ,Gene Expression Regulation ,biology.protein ,Cancer research - Abstract
CtBP is a transcriptional repressor which plays a significant role in the regulation of cell proliferation and tumor progression. It was reported that glucose withdrawal causes induction of Bax due to the dissociation of CtBP from the Bax promoter. However, the precise mechanism involved in the regulation of CtBP still remains unclear. In this study, we found that an activated AMP-activated protein kinase (AMPK) phosphorylates CtBP1 on Ser-158 upon metabolic stresses. Moreover, AMPK-mediated phosphorylation of CtBP1 (S158) attenuates the repressive function of CtBP1. We also confirmed that triggering activation of AMPK by various factors resulted in an increase of Bax gene expression. These findings provide connections of AMPK with CtBP1-mediated regulation of Bax expression for cell death under metabolic stresses.
- Published
- 2013
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