4E68

Unphosphorylated STAT3B core protein binding to dsDNA

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • 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 1.2 of the entry. See complete history. 


Literature

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:  
    4E68

  • 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) ...

    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.



Macromolecules

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(by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Signal transducer and activator of transcription 3B [auth A]596Mus musculusMutation(s): 0 
Gene Names: Aprf, Stat3, STAT3B
UniProt
Find proteins for P42227 (Mus musculus)
Explore P42227 
Go to UniProtKB:  P42227
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP42227
Protein Feature View
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  • Reference Sequence

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Entity ID: 1
MoleculeChainsLengthOrganismImage
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
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • 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
PHASERphasing
REFMACrefinement
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