2XNF image
Entry Detail
PDB ID:
2XNF
Keywords:
TRANSCRIPTION
Title:
The Mediator Med25 activator interaction domain: Structure and cooperative binding of VP16 subdomains
Biological Source:
Source Organism:
HOMO SAPIENS
Host Organism:
ESCHERICHIA COLI
PDB Version:
Deposition Date:
2010-08-02
Release Date:
2011-03-09
Method Details:
Experimental Method:
SOLUTION NMR
Conformers Calculated:
100
Conformers Submitted:
10
Selection Criteria:
ENERGY
2XNF validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Description:MEDIATOR OF RNA POLYMERASE II TRANSCRIPTION SUBUNIT 25
Chain IDs:A
Chain Length:159
Number of Molecules:1
Biological Source:HOMO SAPIENS
UniProt ID:Q71SY5 Pfam ID:PF11232
Ligand Molecules
NA
Primary Citation
Structure and Vp16 Binding of the Mediator Med25 Activator Interaction Domain.
Nat.Struct.Mol.Biol. 18 404 ? (2011)
PMID: 21378965 DOI: 10.1038/NSMB.1997

Abstact

Eukaryotic transcription is regulated by interactions between gene-specific activators and the coactivator complex Mediator. Here we report the NMR structure of the Mediator subunit Med25 (also called Arc92) activator interaction domain (ACID) and analyze the structural and functional interaction of ACID with the archetypical acidic transcription activator VP16. Unlike other known activator targets, ACID forms a seven-stranded β-barrel framed by three helices. The VP16 subdomains H1 and H2 bind to opposite faces of ACID and cooperate during promoter-dependent activated transcription in a in vitro system. The activator-binding ACID faces are functionally required and conserved among higher eukaryotes. Comparison with published activator structures reveals that the VP16 activation domain uses distinct interaction modes to adapt to unrelated target surfaces and folds that evolved for activator binding.

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Primary Citation of related structures
2XNF