The synthesis of proliferating cell nuclear antigen (PCNA) is strictly regulated during the cell cycle. To investigate the contribution of the promoter region to the up-regulation of human PCNA expression at the onset of S phase, we have examined 17 putative elements with reporter assays in quiescent L-O2 cells and following serum stimulation. The E2F-like sequence 5′-TTCCCCGCAA-3′ located at -84 to -75 is required for the serum-induced transactivation. In electrophoretic mobility shift assays, nuclear extracts from asynchronous L-O2 cells exhibit two binding activities toward the -75 E2F oligonucleotide, and the minor band, whose formation could be interfered with by E2F-1 antibody, represents an S phase-specific complex. This is the first demonstration of the E2F site in the human PCNA 5′ promoter as a serum-responsive element. © 2003 Published by Elsevier Science B.V. on behalf of the Federation of European Biochemical Societies.
Li, Y. Y., Wang, L., & Lu, C. D. (2003). An E2F site in the 5′-promoter region contributes to serum-dependent up-regulation of the human proliferating cell nuclear antigen gene. FEBS Letters, 544(1–3), 112–118. https://doi.org/10.1016/S0014-5793(03)00485-X