First-pass extracted concept

CBP/p300 transcriptional coactivators

Candidate: concept label1 source documents6 linked claims

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Aliases

CBP/p300, CREB-binding protein and p300

Extracted Explainers

What the tool is doing

CBP/p300 are described as transcriptional coactivators that interact with many transcription factors and components of the general transcriptional machinery. The review frames them as regulators that can couple activator binding to chromatin acetylation and transcriptional activation.

Source 1DOI PubMed

What problem it solves

They help explain how diverse transcription factor inputs are connected to chromatin modification and transcriptional output. The review also presents them as candidate integrators of synergistic or competitive signaling at promoters.

Source 1DOI PubMed

What it does not solve

The review emphasizes that it remains unresolved whether their main functional targets are histones or other proteins and exactly how phosphorylation regulates them.

Source 1DOI PubMed

Alternatives

The review contrasts CBP/p300-associated functions with mediator-dependent stages of transcription and with other HAT-associated cofactors such as P/CAF, SRC-1, and p/CIP.

Source 1DOI PubMed

Evidence Snippets

CREB1-binding protein (CBP) and p300 are believed to participate in the activities of hundreds of different transcription factors.

Evidence 1Source 1DOI PubMedprovenance

Supporting Sources

Source 1review2001Journal of Biological ChemistryDOI PubMed

1 evidence snippet 6 linked claims Claim 1 Claim 2 Claim 3

Linked Claims

Claim 1chromatin dependencesupports2001Source 1DOI PubMed

The review supports that intrinsic acetyltransferase activity of CBP/p300 is important for transcriptional activation in chromatin contexts.

Claim 2distinct vs overlapping functionmixed2001Source 1DOI PubMed

The review concludes that CBP and p300 share many properties but are not fully interchangeable, with evidence for both distinct and overlapping functions.

Claim 3functional role summarysupports2001Source 1DOI PubMed

CBP/p300 are broadly described as transcriptional coactivators that can position histone acetyltransferase activity near promoter nucleosomes and interact with general transcription machinery.

Claim 4integrator modelmixed2001Source 1DOI PubMed

CBP/p300 are proposed to contribute to transcriptional synergy and signal-induced repression through shared coactivator binding and competition, but the review states that the integrator model is not conclusively established.

Claim 5regulation uncertaintymixed2001Source 1DOI PubMed

Phosphorylation is proposed to regulate CBP/p300, but the review states that the mechanism remains unclear because specific phosphorylation sites had not been precisely identified.

Claim 6substrate scopesupports2001Source 1DOI PubMed

The review argues that CBP/p300 may regulate transcription through acetylation of both histones and non-histone proteins, including transcription factors and associated cofactors.