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Mutagenesis Services> | The pCMV-3HA-E2F1 mutants (K89R, K137R, K161/164R, K181/183R, K266R, K287/289R, K310R) were obtained by site-directed mutagenesis from pCMV-3HA-E2F1 (GenScript, Piscataway, NJ, USA) | Get A Quote |
The E2F transcription factor 1 is subtly regulated along the cell cycle progression and in response to DNA damage by post-translational modifications. Here, we demonstrated that the E3-ubiquitin ligase cellular inhibitor of apoptosis 1 (cIAP1) increases E2F1 K63-poly-ubiquitination on the lysine residue 161/164 cluster, which is associated with the transcriptional factor stability and activity. Mutation of these lysine residues completely abrogates the binding of E2F1 to CCNE, TP73 and APAF1 promoters, thus inhibiting transcriptional activation of these genes and E2F1-mediated cell proliferation control. Importantly, E2F1 stabilization in response to etoposide-induced DNA damage or during the S phase of cell cy... More