2HJD: Crystal Structure Of A Second Quorum Sensing Antiactivator Tram2 From A. Tumefaciens Strain A6

Quorum sensing is a community behavior that bacteria utilize to coordinate a variety of population density-dependent biological functions. In Agrobacterium tumefaciens, quorum sensing regulates the replication and conjugative transfer of the tumor-inducing (Ti) plasmid from pathogenic strains to nonpathogenic derivatives. Most of the quorum-sensing regulatory proteins are encoded within the Ti plasmid. Among these, TraR is a LuxR-type transcription factor playing a key role as the quorum-sensing signal receptor, and TraM is an antiactivator that antagonizes TraR through the formation of a stable oligomeric complex. Recently, a second TraM homologue called TraM2, not encoded on the Ti plasmid of A. tumefaciens A6, was identified, in addition to a copy on the Ti plasmid. In this report, we have characterized TraM2 and its interaction with TraR and solved its crystal structure to 2.1 A. Like TraM, TraM2 folds into a helical bundle and exists as homodimer. TraM2 forms a stable complex (K(d) = 8.6 nM) with TraR in a 1:1 binding ratio, a weaker affinity than that of TraM for TraR. Structural analysis and biochemical studies suggest that protein stability may account for the difference between TraM2 and TraM in their binding affinities to TraR and provide a structural basis for L54 in promoting structural stability of TraM.
PDB ID: 2HJDDownload
MMDB ID: 42261
PDB Deposition Date: 2006/6/30
Updated in MMDB: 2006/12
Experimental Method:
x-ray diffraction
Resolution: 2.1  Å
Source Organism:
Similar Structures:
Biological Unit for 2HJD: dimeric; determined by author and by software (PISA)
Molecular Components in 2HJD
Label Count Molecule
Proteins (2 molecules)
Quorum-sensing Antiactivator
Molecule annotation
* Click molecule labels to explore molecular sequence information.

Citing MMDB