Unphosphorylated STAT3B core protein binding to dsDNA

Experimental Data Snapshot

  • Resolution: 2.58 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.225 
  • R-Value Observed: 0.228 

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This is version 1.3 of the entry. See complete history


Observation of unphosphorylated STAT3 core protein binding to target dsDNA by PEMSA and X-ray crystallography.

Nkansah, E.Shah, R.Collie, G.W.Parkinson, G.N.Palmer, J.Rahman, K.M.Bui, T.T.Drake, A.F.Husby, J.Neidle, S.Zinzalla, G.Thurston, D.E.Wilderspin, A.F.

(2013) FEBS Lett 587: 833-839

  • DOI: https://doi.org/10.1016/j.febslet.2013.01.065
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The STAT3 transcription factor plays a central role in a wide range of cancer types where it is over-expressed. Previously, phosphorylation of this protein was thought to be a prerequisite for direct binding to DNA. However, we have now shown complete binding of a purified unphosphorylated STAT3 (uSTAT3) core directly to M67 DNA, the high affinity STAT3 target DNA sequence, by a protein electrophoretic mobility shift assay (PEMSA). Binding to M67 DNA was inhibited by addition of increasing concentrations of a phosphotyrosyl peptide. X-ray crystallography demonstrates one mode of binding that is similar to that known for the STAT3 core phosphorylated at Y705.

  • Organizational Affiliation

    Department of Pharmaceutical and Biological Chemistry, UCL School of Pharmacy, London, United Kingdom.


Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Signal transducer and activator of transcription 3B [auth A]596Mus musculusMutation(s): 0 
Gene Names: AprfStat3STAT3B
Find proteins for P42227 (Mus musculus)
Explore P42227 
Go to UniProtKB:  P42227
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP42227
Sequence Annotations
  • Reference Sequence

Find similar nucleic acids by:  Sequence   |   3D Structure  

Entity ID: 1
MoleculeChains LengthOrganismImage
DNA (5'-D(*TP*GP*CP*AP*TP*TP*TP*CP*CP*CP*GP*TP*AP*AP*AP*TP*CP*T)-3')A [auth B]18synthetic construct
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.58 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.225 
  • R-Value Observed: 0.228 
  • Space Group: I 41
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 174.14α = 90
b = 174.14β = 90
c = 79.29γ = 90
Software Package:
Software NamePurpose
DNAdata collection
xia2data reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-03-06
    Type: Initial release
  • Version 1.1: 2013-03-13
    Changes: Database references
  • Version 1.2: 2013-04-10
    Changes: Database references
  • Version 1.3: 2023-09-13
    Changes: Data collection, Database references, Refinement description