Abstract
MYC is an oncogenic transcription factor with a novel role in enhancing global transcription when overexpressed. However, how MYC promotes global transcription remains controversial. Here, we used a series of MYC mutants to dissect the molecular basis for MYC-driven global transcription. We found that MYC mutants deficient in DNA binding or known transcriptional activation activities can still promote global transcription and enhance serine 2 phosphorylation (Ser2P) of the RNA polymerase (Pol) II C-terminal domain (CTD), a hallmark of active elongating RNA Pol II. Two distinct regions within MYC can promote global transcription and Ser2P of Pol II CTD. The ability of various MYC mutants to promote global transcription and Ser2P correlates with their ability to suppress CDK9 SUMOylation and enhance positive transcription elongation factor b (P-TEFb) complex formation. We showed that MYC suppresses CDK9 SUMOylation by inhibiting the interaction between CDK9 and SUMO enzymes including UBC9 and PIAS1. Furthermore, MYC’s activity in enhancing global transcription positively contributes to its activity in promoting cell proliferation and transformation. Together, our study demonstrates that MYC promotes global transcription, at least in part, by promoting the formation of the active P-TEFb complex via a sequence-specific DNA-binding activity-independent manner.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (32070643, 32130051, 31961133009), Science and Technology Commission of Shanghai Municipality (20JC1411500), the ECNU Public Platform for Innovation (011) and the Instruments Sharing Platform of the School of Life Sciences, East China Normal University. C.-M.C.’s research is currently supported by the US National Institutes of Health (NIH) grant 1RO1CA251698-01 and Cancer Prevention and Research Institute of Texas (CPRIT) grant RP190077. We thank Professor Bing Li (Shanghai Jiao Tong University School of Medicine) for providing FLAG-CDK9 stable HEK293T cell line. We thank all the other members of Wong’s laboratory for their valuable discussions and technical supports.
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Guan, Q., Chen, Z., Yu, F. et al. MYC promotes global transcription in part by controlling P-TEFb complex formation via DNA-binding independent inhibition of CDK9 SUMOylation. Sci. China Life Sci. 66, 2167–2184 (2023). https://doi.org/10.1007/s11427-022-2281-6
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DOI: https://doi.org/10.1007/s11427-022-2281-6