Crystal Structure of STAT3 N-terminal domain

Experimental Data Snapshot

  • Resolution: 2.70 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.236 

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Impact of the N-Terminal Domain of STAT3 in STAT3-Dependent Transcriptional Activity.

Hu, T.Yeh, J.E.Pinello, L.Jacob, J.Chakravarthy, S.Yuan, G.C.Chopra, R.Frank, D.A.

(2015) Mol Cell Biol 35: 3284-3300

  • DOI: https://doi.org/10.1128/MCB.00060-15
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The transcription factor STAT3 is constitutively active in many cancers, where it mediates important biological effects, including cell proliferation, differentiation, survival, and angiogenesis. The N-terminal domain (NTD) of STAT3 performs multiple functions, such as cooperative DNA binding, nuclear translocation, and protein-protein interactions. However, it is unclear which subsets of STAT3 target genes depend on the NTD for transcriptional regulation. To identify such genes, we compared gene expression in STAT3-null mouse embryonic fibroblasts (MEFs) stably expressing wild-type STAT3 or STAT3 from which NTD was deleted. NTD deletion reduced the cytokine-induced expression of specific STAT3 target genes by decreasing STAT3 binding to their regulatory regions. To better understand the potential mechanisms of this effect, we determined the crystal structure of the STAT3 NTD and identified a dimer interface responsible for cooperative DNA binding in vitro. We also observed an Ni(2+)-mediated oligomer with an as yet unknown biological function. Mutations on both dimer and Ni(2+)-mediated interfaces affected the cytokine induction of STAT3 target genes. These studies shed light on the role of the NTD in transcriptional regulation by STAT3 and provide a structural template with which to design STAT3 NTD inhibitors with potential therapeutic value.

  • Organizational Affiliation

    Center for Proteomic Chemistry, Novartis Institutes for BioMedical Research, Cambridge, Massachusetts, USA Postdoctoral Program, Novartis Institutes for BioMedical Research, Cambridge, Massachusetts, 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, C, D, E
129Mus 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: 2.70 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.236 
  • Space Group: P 41 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 109.012α = 90
b = 109.012β = 90
c = 154.3γ = 90
Software Package:
Software NamePurpose
XSCALEdata scaling
PDB_EXTRACTdata extraction
XDSdata reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-07-29
    Type: Initial release
  • Version 1.1: 2023-09-27
    Changes: Data collection, Database references, Derived calculations, Refinement description