Crystal structure of the Taz2:C/EBPepsilon-TAD chimera protein

Experimental Data Snapshot

  • Resolution: 1.50 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.180 

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This is version 1.3 of the entry. See complete history


Structural insights into interactions of C/EBP transcriptional activators with the Taz2 domain of p300.

Bhaumik, P.Davis, J.Tropea, J.E.Cherry, S.Johnson, P.F.Miller, M.

(2014) Acta Crystallogr D Biol Crystallogr 70: 1914-1921

  • DOI: https://doi.org/10.1107/S1399004714009262
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Members of the C/EBP family of transcription factors bind to the Taz2 domain of p300/CBP and mediate its phosphorylation through the recruitment of specific kinases. Short sequence motifs termed homology boxes A and B, which comprise their minimal transactivation domains (TADs), are conserved between C/EBP activators and are necessary for specific p300/CBP binding. A possible mode of interaction between C/EBP TADs and the p300 Taz2 domain was implied by the crystal structure of a chimeric protein composed of residues 1723-1818 of p300 Taz2 and residues 37-61 of C/EBPℇ. The segment corresponding to the C/EBPℇ TAD forms two orthogonally disposed helices connected by a short linker and interacts with the core structure of Taz2 from a symmetry-related molecule. It is proposed that other members of the C/EBP family interact with the Taz2 domain in the same manner. The position of the C/EBPℇ peptide on the Taz2 protein interaction surface suggests that the N-termini of C/EBP proteins are unbound in the C/EBP-p300 Taz2 complex. This observation is in agreement with the known location of the docking site of protein kinase HIPK2 in the C/EBPβ N-terminus, which associates with the C/EBPβ-p300 complex.

  • Organizational Affiliation

    Protein Structure Section, Macromolecular Crystallography Laboratory, National Cancer Institute at Frederick, Frederick, MD 21702, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Gene Names: EP300P300
EC: (PDB Primary Data), 2.3.1 (UniProt)
UniProt & NIH Common Fund Data Resources
Find proteins for Q15744 (Homo sapiens)
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Go to UniProtKB:  Q15744
PHAROS:  Q15744
Find proteins for Q09472 (Homo sapiens)
Explore Q09472 
Go to UniProtKB:  Q09472
PHAROS:  Q09472
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsQ15744Q09472
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.50 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.180 
  • Space Group: P 65
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 47.86α = 90
b = 47.86β = 90
c = 104.13γ = 120
Software Package:
Software NamePurpose
MAR345dtbdata collection
XDSdata reduction
XDSdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-08-08
    Type: Initial release
  • Version 1.1: 2014-07-16
    Changes: Database references
  • Version 1.2: 2017-08-09
    Changes: Refinement description, Source and taxonomy
  • Version 1.3: 2018-10-10
    Changes: Data collection, Database references, Structure summary