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  • Title: CBP/p300 histone acetyl-transferase activity is important for the G1/S transition.
    Author: Ait-Si-Ali S, Polesskaya A, Filleur S, Ferreira R, Duquet A, Robin P, Vervish A, Trouche D, Cabon F, Harel-Bellan A.
    Journal: Oncogene; 2000 May 11; 19(20):2430-7. PubMed ID: 10828885.
    Abstract:
    Transforming viral proteins such as E1A which force quiescent cells into S phase have two essential cellular target proteins, Rb and CBP/p300. Rb regulates the G1/S transition by controlling the transcription factor E2F. CBP/p300 is a transcriptional co-activator with intrinsic histone acetyl-transferase activity. This activity is regulated in a cell cycle dependent manner and shows a peak at the G1/S transition, suggesting a function for CBP/p300 in this crucial step of the cell cycle. Here, we have artificially modulated CBP/p300 levels in individual cells through microinjection of specific antibodies and expression vectors. We show that CBP/p300 is required for cell proliferation and has an essential function during the G1/S transition. Using the same microinjection system and GFP-reporter vectors, we demonstrate that CBP/p300 is essential for the activity of E2F, a transcription factor that controls the G1/S transition. In addition, our results suggest that CBP HAT activity is required both for the G1/S transition and for E2F activity. Thus CBP/p300 seems to be a versatile protein involved in opposing cellular processes, which raises the question of how its multiple activities are regulated.
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