2KY6 image
Deposition Date 2010-05-14
Release Date 2011-03-09
Last Version Date 2024-05-01
Entry Detail
PDB ID:
2KY6
Title:
Structure of ARC92VBD/MED25ACID
Biological Source:
Source Organism:
Homo sapiens (Taxon ID: 9606)
Host Organism:
Method Details:
Experimental Method:
Conformers Calculated:
50
Conformers Submitted:
25
Selection Criteria:
structures with the lowest energy
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Mediator of RNA polymerase II transcription subunit 25
Gene (Uniprot):MED25
Chain IDs:A
Chain Length:166
Number of Molecules:1
Biological Source:Homo sapiens
Ligand Molecules
Primary Citation
Structure of the VP16 transactivator target in the Mediator.
Nat.Struct.Mol.Biol. 18 410 415 (2011)
PMID: 21378963 DOI: 10.1038/nsmb.1999

Abstact

The human Mediator coactivator complex interacts with many transcriptional activators and facilitates recruitment of RNA polymerase II to promote target gene transcription. The MED25 subunit is a critical target of the potent herpes simplex 1 viral transcriptional activator VP16. Here we determine the solution structure of the MED25 VP16-binding domain (VBD) and define its binding site for the N-terminal portion of the VP16 transactivation domain (TADn). A hydrophobic furrow, formed by a β-barrel and two α-helices in MED25 VBD, interacts tightly with VP16 TADn. Mutations in this furrow prevent binding of VP16 TAD to MED25 VBD and interfere with the ability of overexpressed MED25 VBD to inhibit VP16-dependent transcriptional activation in vivo. This detailed molecular understanding of transactivation by the benchmark activator VP16 could provide important insights into viral and cellular gene activation mechanisms.

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Primary Citation of related structures