期刊
MOLECULAR AND CELLULAR BIOLOGY
卷 20, 期 16, 页码 5797-5807出版社
AMER SOC MICROBIOLOGY
DOI: 10.1128/MCB.20.16.5797-5807.2000
关键词
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资金
- NCI NIH HHS [T32 CA009135, R01 CA045240, CA09681, CA09135, T32 CA009681, CA45240] Funding Source: Medline
E2F-mediated transcription is thought to involve binding of an E2F-pocket protein complex to promoters in the G(0) phase of the cell cycle and release of the pocket protein in late G(1), followed by release of E2F in S phase. We have tested this model by monitoring protein-DNA interactions in living cells using a formaldehyde cross-linking and immunoprecipitation assay. We find that E2F target genes are bound by distinct E2F-pocket protein complexes which change as cells progress through the cell cycle. We also find that certain E2F target gene promoters are bound by pocket proteins when such promoters are transcriptionally active. Our data indicate that the current model applies only to certain E2F target genes and suggest that Rb family members may regulate transcription in both G(0) and S phases. Finally, we find that a given promoter can be bound by one of several different E2F-pocket protein complexes at a given time in the cell cycle, suggesting that cell cycle-regulated transcription is a stochastic, not a predetermined, process.
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