6QHD

Lysine acetylated and tyrosine phosphorylated STAT3 in a complex with DNA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.85 Å
  • R-Value Free: 0.343 
  • R-Value Work: 0.294 
  • R-Value Observed: 0.297 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Unexpected implications of STAT3 acetylation revealed by genetic encoding of acetyl-lysine.

Belo, Y.Mielko, Z.Nudelman, H.Afek, A.Ben-David, O.Shahar, A.Zarivach, R.Gordan, R.Arbely, E.

(2019) Biochim Biophys Acta Gen Subj 1863: 1343-1350

  • DOI: 10.1016/j.bbagen.2019.05.019
  • Primary Citation of Related Structures:  
    6QHD

  • PubMed Abstract: 
  • The signal transducer and activator of transcription 3 (STAT3) protein is activated by phosphorylation of a specific tyrosine residue (Tyr705) in response to various extracellular signals. STAT3 activity was also found to be regulated by acetylation of Lys685 ...

    The signal transducer and activator of transcription 3 (STAT3) protein is activated by phosphorylation of a specific tyrosine residue (Tyr705) in response to various extracellular signals. STAT3 activity was also found to be regulated by acetylation of Lys685. However, the molecular mechanism by which Lys685 acetylation affects the transcriptional activity of STAT3 remains elusive. By genetically encoding the co-translational incorporation of acetyl-lysine into position Lys685 and co-expression of STAT3 with the Elk receptor tyrosine kinase, we were able to characterize site-specifically acetylated, and simultaneously acetylated and phosphorylated STAT3. We measured the effect of acetylation on the crystal structure, and DNA binding affinity and specificity of Tyr705-phosphorylated and non-phosphorylated STAT3. In addition, we monitored the deacetylation of acetylated Lys685 by reconstituting the mammalian enzymatic deacetylation reaction in live bacteria. Surprisingly, we found that acetylation, per se, had no effect on the crystal structure, and DNA binding affinity or specificity of STAT3, implying that the previously observed acetylation-dependent transcriptional activity of STAT3 involves an additional cellular component. In addition, we discovered that Tyr705-phosphorylation protects Lys685 from deacetylation in bacteria, providing a new possible explanation for the observed correlation between STAT3 activity and Lys685 acetylation.


    Organizational Affiliation

    Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel; The National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel; Department of Life Sciences, Ben-Gurion University of the Negev, Beer-Sheva, 8410501, Israel. Electronic address: arbely@bgu.ac.il.



Macromolecules

Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Signal transducer and activator of transcription 3A, B596Homo sapiensMutation(s): 0 
Gene Names: STAT3APRF
UniProt & NIH Common Fund Data Resources
Find proteins for P40763 (Homo sapiens)
Explore P40763 
Go to UniProtKB:  P40763
PHAROS:  P40763
Protein Feature View
Expand
  • Reference Sequence
  • Find similar nucleic acids by:  Sequence   |   Structure
  • Entity ID: 2
    MoleculeChainsLengthOrganismImage
    DNA (5'-D(*AP*AP*GP*AP*TP*TP*TP*AP*CP*GP*GP*GP*AP*AP*AP*TP*GP*C)-3')C18Murine adenovirus 1
    Protein Feature View
    Expand
    • Reference Sequence
    • Find similar nucleic acids by:  Sequence   |   Structure
    • Entity ID: 3
      MoleculeChainsLengthOrganismImage
      DNA (5'-D(*TP*GP*CP*AP*TP*TP*TP*CP*CP*CP*GP*TP*AP*AP*AP*TP*CP*T)-3')D18Murine adenovirus 1
      Protein Feature View
      Expand
      • Reference Sequence
      Small Molecules
      Modified Residues  2 Unique
      IDChainsTypeFormula2D DiagramParent
      ALY
      Query on ALY
      A, BL-PEPTIDE LINKINGC8 H16 N2 O3LYS
      PTR
      Query on PTR
      A, BL-PEPTIDE LINKINGC9 H12 N O6 PTYR
      Experimental Data & Validation

      Experimental Data

      • Method: X-RAY DIFFRACTION
      • Resolution: 2.85 Å
      • R-Value Free: 0.343 
      • R-Value Work: 0.294 
      • R-Value Observed: 0.297 
      • Space Group: P 41
      Unit Cell:
      Length ( Å )Angle ( ˚ )
      a = 175.491α = 90
      b = 175.491β = 90
      c = 79.078γ = 90
      Software Package:
      Software NamePurpose
      REFMACrefinement
      XDSdata reduction
      XDSdata scaling
      PHASERphasing

      Structure Validation

      View Full Validation Report



      Entry History & Funding Information

      Deposition Data


      Funding OrganizationLocationGrant Number
      Israel Science FoundationIsrael807/15

      Revision History  (Full details and data files)

      • Version 1.0: 2019-06-19
        Type: Initial release
      • Version 1.1: 2019-06-26
        Changes: Data collection, Database references