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Rush Cancer, Institute Section of Myeloid Diseases and MDS Center, Rush-Presbyterian-St. Luke’s Medical Center, Rush University, Chicago, Illinois, USA
1Correspondence: Departments of Medicine and Biochemistry, Rush University, 2242 West Harrison St., Suite 108, Chicago, IL 60612, USA. E-mail: suneelmundle{at}hotmail.com
E2F transcription factors may play a pivotal role in the transcriptional regulation of several cellular processes far beyond the originally described cell cycle and proliferation. Among the six E2F family members, only E2F1 is noted for its role in apoptosis. The pocket protein family members Rb, p107, and p130 act as the main regulators of E2F activity. Nonetheless, in recent years other protein–protein interactions have been described for E2Fs. The post-translational modifications resulting from such protein interactions may have significant implications in the stability, half-life, and functional activity of E2Fs. In human diseases the significance of E2Fs is still under appreciated and is primarily recognized only as a consequence of the impairment in retinoblastoma gene product (Rb). However, with increasing knowledge of other protein interactions, the derailment of E2F activity could be anticipated to stem from an abnormality of any node in the complex network governing their availability and activity. The present review is intended to provide a perspective on the diversity of biochemical mechanisms underlying abnormal E2F expression and activity, understanding of which may have significant clinical implications.—Mundle, S. D., Saberwal, G. Evolving intricacies and implications of E2F1 regulation.
Key Words: E2F • post-translational modifications • pocket proteins
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