3QOD image
Entry Detail
PDB ID:
3QOD
Keywords:
DNA BINDING PROTEIN
Title:
Crystal Structure of Heterocyst Differentiation Protein, HetR from Fischerella mv11
Biological Source:
Source Organism:
Fischerella thermalis
Host Organism:
Escherichia coli
PDB Version:
Deposition Date:
2011-02-09
Release Date:
2011-04-20
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
3.38 Å
R-Value Free:
0.26
R-Value Work:
0.20
R-Value Observed:
0.20
Space Group:
P 65
3QOD validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Description:Heterocyst differentiation protein
Chain IDs:A, B
Chain Length:302
Number of Molecules:2
Biological Source:Fischerella thermalis
UniProt ID:Q2ACK9 Pfam ID:PF03574, PF18460
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
MSE A MET SELENOMETHIONINE
Primary Citation
Structure of transcription factor HetR required for heterocyst differentiation in cyanobacteria.
Proc.Natl.Acad.Sci.USA 108 10109 10114 (2011)
PMID: 21628585 DOI: 10.1073/pnas.1106840108

Abstact

HetR is an essential regulator of heterocyst development in cyanobacteria. HetR binds to a DNA palindrome upstream of the hetP gene. We report the crystal structure of HetR from Fischerella at 3.0 Å. The protein is a dimer comprised of a central DNA-binding unit containing the N-terminal regions of the two subunits organized with two helix-turn-helix motifs; two globular flaps extending in opposite directions; and a hood over the central core formed from the C-terminal subdomains. The flaps and hood have no structural precedent in the protein database, therefore representing new folds. The structural assignments are supported by site-directed mutagenesis and DNA-binding studies. We suggest that HetR serves as a scaffold for assembly of transcription components critical for heterocyst development.

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Primary Citation of related structures
3QOE