1UUR

Structure of an activated Dictyostelium STAT in its DNA-unbound form

• PDB DOI: https://doi.org/10.2210/pdb1UUR/pdb

• Classification: TRANSCRIPTION ACTIVATOR
• Organism(s): Dictyostelium discoideum
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2004-01-09 Released: 2004-03-26 
• Deposition Author(s): Soler-Lopez, M., Petosa, C., Fukuzawa, M., Ravelli, R., Williams, J.G., Muller, C.W.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.70 Å
• R-Value Free: 0.270 
• R-Value Work: 0.210 
• R-Value Observed: 0.210 

Literature

Structure of an Activated Dictyostelium Stat in its DNA-Unbound Form

Soler-Lopez, M., Petosa, C., Fukuzawa, M., Ravelli, R., Williams, J.G., Muller, C.W.

(2004) Mol Cell 13: 791

• PubMed: 15053873 
• DOI: https://doi.org/10.1016/s1097-2765(04)00130-3
• Primary Citation of Related Structures:  
  1UUR, 1UUS


• PubMed Abstract: 
  

  Dd-STATa is a STAT protein which transcriptionally regulates cellular differentiation in Dictyostelium discoideum, the only non-metazoan known to employ SH2 domain signaling. The 2.7 A crystal structure of a tyrosine phosphorylated Dd-STATa homodimer reveals a four-domain architecture similar to that of mammalian STATs 1 and 3, but with an inverted orientation for the coiled-coil domain. Dimerization is mediated by SH2 domain:phosphopeptide interactions and by a direct interaction between SH2 domains. The unliganded Dd-STATa dimer adopts a fully extended conformation remarkably different from that of the DNA-bound mammalian STATs, implying a large conformational change upon target site recognition. Buried hydrophilic residues predicted to destabilize the coiled-coil domain suggest how hydrophobic residues may become exposed and mediate nuclear export. Functional and evolutionary implications for metazoan STAT proteins are discussed.

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Organizational Affiliation: 

European Molecular Biology Laboratory, Grenoble Outstation, B.P. 181, 38042 Grenoble Cedex 9, France.

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 53.38 kDa 
• Atom Count: 3,677 
• Modelled Residue Count: 461 
• Deposited Residue Count: 473 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
STATA PROTEIN	A	473	Dictyostelium discoideum	Mutation(s): 0
UniProt
Find proteins for O00910 (Dictyostelium discoideum) Explore O00910  Go to UniProtKB:  O00910

Small Molecules

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
PTR	A	L-PEPTIDE LINKING	C9 H12 N O6 P		TYR

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.70 Å
• R-Value Free: 0.270 
• R-Value Work: 0.210 
• R-Value Observed: 0.210 
• Space Group: C 2 2 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 121.6	α = 90
b = 144	β = 90
c = 67.1	γ = 90

Software Package:

Software Name	Purpose
CNS	refinement
DENZO	data reduction
SCALEPACK	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 2004-03-26 
Deposition Author(s): Soler-Lopez, M., Petosa, C., Fukuzawa, M., Ravelli, R., Williams, J.G., Muller, C.W.

Revision History  

• Version 1.0: 2004-03-26
  Type: Initial release
  
• Version 1.1: 2011-05-08
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2024-11-20
  Changes: Data collection, Database references, Derived calculations, Structure summary