6GYR image
Entry Detail
PDB ID:
6GYR
Keywords:
Title:
Transcription factor dimerization activates the p300 acetyltransferase
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2018-07-01
Release Date:
2018-10-17
Method Details:
Experimental Method:
Resolution:
3.10 Å
R-Value Free:
0.26
R-Value Work:
0.20
R-Value Observed:
0.21
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Histone acetyltransferase p300
Mutations:Y1467F
Chain IDs:A, B, C, D
Chain Length:588
Number of Molecules:4
Biological Source:Homo sapiens
Primary Citation
Transcription factor dimerization activates the p300 acetyltransferase.
Nature 562 538 544 (2018)
PMID: 30323286 DOI: 10.1038/s41586-018-0621-1

Abstact

The transcriptional co-activator p300 is a histone acetyltransferase (HAT) that is typically recruited to transcriptional enhancers and regulates gene expression by acetylating chromatin. Here we show that the activation of p300 directly depends on the activation and oligomerization status of transcription factor ligands. Using two model transcription factors, IRF3 and STAT1, we demonstrate that transcription factor dimerization enables the trans-autoacetylation of p300 in a highly conserved and intrinsically disordered autoinhibitory lysine-rich loop, resulting in p300 activation. We describe a crystal structure of p300 in which the autoinhibitory loop invades the active site of a neighbouring HAT domain, revealing a snapshot of a trans-autoacetylation reaction intermediate. Substrate access to the active site involves the rearrangement of an autoinhibitory RING domain. Our data explain how cellular signalling and the activation and dimerization of transcription factors control the activation of p300, and therefore explain why gene transcription is associated with chromatin acetylation.

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