1H0M image
Deposition Date 2002-06-25
Release Date 2002-08-29
Last Version Date 2024-11-13
Entry Detail
PDB ID:
1H0M
Title:
Three-dimensional structure of the quorum sensing protein TraR bound to its autoinducer and to its target DNA
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
3.00 Å
R-Value Free:
0.28
R-Value Work:
0.23
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Transcriptional activator protein TraR
Gene (Uniprot):traR
Chain IDs:A, B, C, D
Chain Length:234
Number of Molecules:4
Biological Source:Rhizobium radiobacter
Polymer Type:polydeoxyribonucleotide
Molecule:5'-D(*AP*TP*GP*TP*GP*CP*AP*GP*AP*TP *CP*TP*GP*CP*AP*CP*AP*T)-3'
Chain IDs:E, F, G, H
Chain Length:18
Number of Molecules:4
Biological Source:synthetic construct
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
MSE A MET modified residue
Ligand Molecules
Primary Citation
The Crystal Structure of the Quorum Sensing Protein Trar Bound to its Autoinducer and Target DNA
Embo J. 21 4393 ? (2002)
PMID: 12198141 DOI: 10.1093/EMBOJ/CDF459

Abstact

The quorum sensing system allows bacteria to sense their cell density and initiate an altered pattern of gene expression after a sufficient quorum of cells has accumulated. In Agrobacterium tumefaciens, quorum sensing controls conjugal transfer of the tumour- inducing plasmid, responsible for plant crown gall disease. The core components of this system are the transcriptional regulator TraR and its inducing ligand N-(3-oxo-octanoyl)-L-homoserine lactone. This complex binds DNA and activates gene expression. We have determined the crystal structure of TraR in complex with its autoinducer and target DNA (PDB code 1h0m). The protein is dimeric, with each monomer composed of an N-terminal domain, which binds the ligand in an enclosed cavity far from the dimerization region, and a C-terminal domain, which binds DNA via a helix-turn-helix motif. The structure reveals an asymmetric homodimer, with one monomer longer than the other. The N-terminal domain resembles GAF/PAS domains, normally fused to catalytic signalling domains. In TraR, the gene fusion is between a GAF/PAS domain and a DNA-binding domain, resulting in a specific transcriptional regulator involved in quorum sensing.

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Primary Citation of related structures