Unphosphorylated mouse STAT3 core fragment

Experimental Data Snapshot

  • Resolution: 3.05 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.250 

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This is version 1.2 of the entry. See complete history


Crystal structure of unphosphorylated STAT3 core fragment.

Ren, Z.Mao, X.Mertens, C.Krishnaraj, R.Qin, J.Mandal, P.K.Romanowski, M.J.McMurray, J.S.Chen, X.

(2008) Biochem Biophys Res Commun 374: 1-5

  • DOI: https://doi.org/10.1016/j.bbrc.2008.04.049
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Signal transducers and activators of transcription (STATs) are latent cytoplasmic transcriptional factors that play an important role in cytokine and growth factor signaling. Here we report a 3.05 A-resolution crystal structure of an unphosphorylated STAT3 core fragment. The overall monomeric structure is very similar to that of the phosphorylated STAT3 core fragment. However, the dimer interface observed in the unphosphorylated STAT1 core fragment structure is absent in the STAT3 structure. Solution studies further demonstrate that the core fragment of STAT3 is primarily monomeric. Mutations corresponding to those in STAT1, which lead to disruption of the core fragment interface and prolonged tyrosine phosphorylation, show little or no effect on the tyrosine phosphorylation kinetics of STAT3. These results highlight the structural and biochemical differences between STAT3 and STAT1, and suggest different regulation mechanisms of these two proteins.

  • Organizational Affiliation

    Department of Biochemistry and Molecular Biology, University of Texas MD Anderson Cancer Center, 1515 Holcombe Blvd., Unit 1000, Houston, TX 77030, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Signal transducer and activator of transcription 3
A, B
562Mus musculusMutation(s): 0 
Gene Names: Stat3Aprf
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
Experimental Data & Validation

Experimental Data

  • Resolution: 3.05 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.250 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 254.779α = 90
b = 254.779β = 90
c = 123.781γ = 120
Software Package:
Software NamePurpose
HKL-2000data collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-07-01
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2023-08-30
    Changes: Data collection, Database references, Refinement description