4E68 image
Deposition Date 2012-03-15
Release Date 2013-03-06
Last Version Date 2023-09-13
Entry Detail
PDB ID:
4E68
Title:
Unphosphorylated STAT3B core protein binding to dsDNA
Biological Source:
Source Organism:
Mus musculus (Taxon ID: 10090)
Synthetic (Taxon ID: 32630)
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.59 Å
R-Value Free:
0.27
R-Value Work:
0.22
R-Value Observed:
0.22
Space Group:
I 41
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Signal transducer and activator of transcription 3
Gene (Uniprot):Stat3
Chain IDs:B (auth: A)
Chain Length:596
Number of Molecules:1
Biological Source:Mus musculus
Polymer Type:polydeoxyribonucleotide
Molecule:DNA (5'-D(*TP*GP*CP*AP*TP*TP*TP*CP*CP*CP*GP*TP*AP*AP*AP*TP*CP*T)-3')
Chain IDs:A (auth: B)
Chain Length:18
Number of Molecules:1
Biological Source:Synthetic
Primary Citation
Observation of unphosphorylated STAT3 core protein binding to target dsDNA by PEMSA and X-ray crystallography.
Febs Lett. 587 833 839 (2013)
PMID: 23434585 DOI: 10.1016/j.febslet.2013.01.065

Abstact

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.

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Primary Citation of related structures