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Targeted and Interactome Proteomics Revealed the Role of PHD2 in Regulating BRD4 Proline Hydroxylation.

Mol Cell Proteomics. 2019 Sep;18(9):1772-1781. Epub 2019 Jun 25
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摘要


Proline hydroxylation is a critical cellular mechanism regulating energy homeostasis and development. Our previous study identified and validated Bromodomain-containing protein 4 (BRD4) as a proline hydroxylation substrate in cancer cells. Yet, the regulatory mechanism and the functional significance of the modification remain unknown. In this study, we developed targeted quantification assays using parallel-reaction monitoring and biochemical analysis to identify the major regulatory enzyme of BRD4 proline hydroxylation. We further performed quantitative interactome analysis to determine the functional significance of the modification pathway in BRD4-mediated protein-protein interactions and gene transcription. Our findings revealed that PHD2 is the key regulatory enzyme of BRD4 proline hydroxylation and the modification significantly affects BRD4 interactions with key transcription factors as well as BRD4-mediated transcriptional activation. Taken together, this study provided mechanistic insights into the oxygen-dependent modification of BRD4 and revealed new roles of the pathway in regulating BRD4-dependent gene expression.

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