Abstract
Ectopic expression of the CDK inhibitors (CKIs) p16INK4a and p27Kip1 in Rat1 fibroblasts induces dephosphorylation and activation of Retinoblastoma-family proteins (pRb, p107 and p130), their association with E2F proteins, and cell cycle arrest in G1. The growth-inhibitory action of p16, in particular, is believed to be mediated essentially via pRb activation. The 12S E1A protein of human Adenovirus 5 associates with pRb-family proteins via residues in its Conserved Regions (CR) 1 and 2, in particular through the motif LXCXE in CR2. These interactions are required for E1A to prevent G1 arrest upon co-expression of CKIs. We show here that mutating either of two conserved motifs adjacent to LXCXE in CR2, GFP and SDDEDEE, also impairs the ability of E1A to overcome G1 arrest by p16 or p27. Strikingly, however, these mutations affect neither the association of E1A with pRb, p07 and p130, nor its ability to derepress E2F-1 transcriptional activity in transient transfection assays. One of the E1A mutants, however, is defective in derepressing several endogenous E2F target genes in the presence of p16 or p27. Thus, CR2 possesses an essential function besides pRb-binding. We speculate that this function might be required for the full derepression of E2F-regulated genes in their natural chromatin context.
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Acknowledgements
We thank all the members of our group for precious discussions and feedback during the course of this work. We also thank Ed Harlow and Ken Raj for the kind gift of E1A and MCM antibodies respectively, Willy Krek and Kristian Helin for E2F and DP plasmids, James DeGregori for the cyclin E-Luciferase plasmid and Michele Brunori and Richard Iggo for the E2/E3-Luciferase plasmid. K Alevizopoulos was supported by a post-doctoral fellowship from the Swiss Cancer League. B Amati was a recipient of a START fellowship and of a research grant from the Swiss National Science Foundation.
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Alevizopoulos, K., Sanchez, B. & Amati, B. Conserved region 2 of adenovirus E1A has a function distinct from pRb binding required to prevent cell cycle arrest by p16INK4a or p27Kip1. Oncogene 19, 2067–2074 (2000). https://doi.org/10.1038/sj.onc.1203534
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DOI: https://doi.org/10.1038/sj.onc.1203534