2AVU image
Deposition Date 2005-08-30
Release Date 2005-12-13
Last Version Date 2024-02-14
Entry Detail
PDB ID:
2AVU
Title:
Structure of the Escherichia coli FlhDC complex, a prokaryotic heteromeric regulator of transcription
Biological Source:
Source Organism:
Escherichia coli (Taxon ID: 562)
Method Details:
Experimental Method:
Resolution:
3.00 Å
R-Value Free:
0.25
R-Value Work:
0.21
R-Value Observed:
0.21
Space Group:
P 61
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Transcriptional activator flhD
Gene (Uniprot):flhD
Chain IDs:A, B, C, D
Chain Length:116
Number of Molecules:4
Biological Source:Escherichia coli
Polymer Type:polypeptide(L)
Molecule:Flagellar transcriptional activator flhC
Gene (Uniprot):flhC
Chain IDs:E, F
Chain Length:192
Number of Molecules:2
Biological Source:Escherichia coli
Ligand Molecules
Primary Citation
Structure of the Escherichia coli FlhDC Complex, a Prokaryotic Heteromeric Regulator of Transcription.
J.Mol.Biol. 355 798 808 (2006)
PMID: 16337229 DOI: 10.1016/j.jmb.2005.11.020

Abstact

The hetero-oligomeric complex of the FlhD and FlhC proteins (FlhDC) regulates transcription from several flagellar and non-flagellar operons in bacteria. The crystallographic structure of the Escherichia coli FlhDC complex has been solved to 3.0 A resolution, revealing a hexameric FlhD4FlhC2 assembly. In the complex, each FlhC protomer binds an FlhD2 dimer; the conformation of the dimer in the complex differs significantly from its conformation in the absence of FlhC. FlhC has a novel tertiary fold that includes a heretofore unrecognized zinc-binding site in which the ion is ligated by four cysteine residues. Gel shift experiments show that binding of the FlhDC complex to a cognate promoter bends the DNA by approximately 111 degrees . The structure of the FlhDC complex is compatible with models in which a fragment of operator DNA, at least 48 base-pairs in length, wraps around the complex and bends significantly when binding.

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