Structure of unphosphorylated STAT5a

Experimental Data Snapshot

  • Resolution: 3.21 Å
  • R-Value Free: 0.299 
  • R-Value Work: 0.266 
  • R-Value Observed: 0.269 

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This is version 1.4 of the entry. See complete history


Structure of the unphosphorylated STAT5a dimer

Neculai, D.Neculai, A.M.Verrier, S.Straub, K.Klumpp, K.Pfitzner, E.Becker, S.

(2005) J Biol Chem 280: 40782-40787

  • DOI: https://doi.org/10.1074/jbc.M507682200
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    STAT proteins have the function of signaling from the cell membrane into the nucleus, where they regulate gene transcription. Latent mammalian STAT proteins can form dimers in the cytoplasm even before receptor-mediated activation by specific tyrosine phosphorylation. Here we describe the 3.21-A crystal structure of an unphosphorylated STAT5a homodimer lacking the N-terminal domain as well as the C-terminal transactivation domain. The overall structure of this fragment is very similar to phosphorylated STATs. However, important differences exist in the dimerization mode. Although the interface between phosphorylated STATs is mediated by their Src-homology 2 domains, the unphosphorylated STAT5a fragment dimerizes in a completely different manner via interactions between their beta-barrel and four-helix bundle domains. The STAT4 N-terminal domain dimer can be docked onto this STAT5a core fragment dimer based on shape and charge complementarities. The separation of the dimeric arrangement, taking place upon activation and nuclear translocation of STAT5a, is demonstrated by fluorescence resonance energy transfer experiments in living cells.

  • Organizational Affiliation

    Department for NMR-based Structural Biology, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Signal transducer and activator of transcription 5A
A, B, C
585Mus musculusMutation(s): 0 
Find proteins for P42230 (Mus musculus)
Explore P42230 
Go to UniProtKB:  P42230
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP42230
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.21 Å
  • R-Value Free: 0.299 
  • R-Value Work: 0.266 
  • R-Value Observed: 0.269 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 143.02α = 90
b = 235.43β = 108.76
c = 111.42γ = 90
Software Package:
Software NamePurpose
MAR345data collection
XDSdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-10-04
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.3: 2017-10-11
    Changes: Refinement description
  • Version 1.4: 2023-10-25
    Changes: Data collection, Database references, Refinement description