WDR77 Controls Cell Growth Proliferation Through e2f Transcription Factors
Mahmood, Anber Altayyar, Clark Atlanta University
2022-12
2020-2029
WD repeat domain 77 protein (WDR77) is required for cellular proliferation of lung and prostate epithelial cells during earlier stages of development and is reactivated during prostate and lung tumorigenesis. WDR77 also plays an essential role in prostate tumorigenesis mediated by growth regulatory factors. Here, we identified E2F1 and E2F3 mRNAs as translational targets of WDR77. We demonstrated that WDR77 regulated the translation of E2F1 and E2F3 mRNAs through the 5? untranslated regions (UTRs) of E2F1 and E2F3 (E2F1/3) mRNAs. WDR77 physically interacted with programmed cell death 4 (PDCD4) that suppresses the translation of mRNAs containing structured 5? UTRs by interacting with eukaryotic translation initiation factor 4A (eIF4A) and inhibiting its helicase activity. Further, we demonstrated that the interaction between WDR77 and PDCD4 prevented the binding of PDCD4 to eIF4A and relieved PDCD4?s inhibitory effect on eIF4A1. Overall, our work reveals for the first time that WDR77 is directly involved in the translational regulation of E2F1/3 mRNAs through their structured 5? UTRs, PDCD4, and eIF4A1 and provides novel insight into the cell growth controlled by WDR77.
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Atlanta University and Clark Atlanta University Theses and Dissertations
dissertation
Doctor of Philosophy (PhD)
Clark Atlanta University
Department of Biological Sciences
Wang, Zhengxin
Georgia--Atlanta
http://hdl.handle.net/20.500.12322/cau.td:2022_anber_altayyar_mahmood_n
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