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Article

Dual control of quorum sensing by two TraM-type antiactivators in Agrobacterium tumefaciens octopine strain A6.

Journal of bacteriology - 1 Apr 2006

Wang Chao, Zhang Hai-Bao, Chen Guozhou, Chen Lingling, Zhang Lian-Hui

Abstract excerpt

Agrobacterium tumefaciens wild-type strains have a unique quorum-sensing (QS)-dependent Ti plasmid conjugative transfer phenotype in which QS signaling is activated by corresponding conjugative opine inducers. Strain K588, with a nopaline-type chromosomal background harboring an octopine-type Ti plasmid, however, is a spontaneous mutant displaying a constitutive phenotype in QS. In this study, we show that a...

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Identifiers

PMID: 16547030
DOI: 10.1128/JB.188.7.2435-2445.2006
PMCID: PMC1428432

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PubMed metadata and Literature Corpus relationships. Corpus snapshot updated 7 Sept 2026. Manifest publication-graph-cohort-2026-09-07.1.

Source receipt: pubmed, retrieved 7 Sept 2026.

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Dual control of quorum sensing by two TraM-type antiactivators in Agrobacterium tumefaciens octopine strain A6.PMID 16547030Read ↗

Octopine-type Ti plasmids code for a mannopine-inducible dominant-negative allele of traR, the quorum-sensing activator that regulates Ti plasmid conjugal transfer.Semantic proximity Read ↗

A new regulatory element modulates homoserine lactone-mediated autoinduction of Ti plasmid conjugal transfer.Semantic proximity Read ↗

Quorum-quenching limits quorum-sensing exploitation by signal-negative invaders.Semantic proximity Read ↗

Quorum-sensing antiactivator TraM forms a dimer that dissociates to inhibit TraR.Semantic proximity Read ↗

The antiactivator TraM interferes with the autoinducer-dependent binding of TraR to DNA by interacting with the C-terminal region of the quorum-sensing activator.Semantic proximity Read ↗

The Agrobacterium tumefaciens rnd homolog is required for TraR-mediated quorum-dependent activation of Ti plasmid tra gene expression.Semantic proximity Read ↗

Induction and loss of Ti plasmid conjugative competence in response to the acyl-homoserine lactone quorum-sensing signal.Semantic proximity Read ↗

Crystal structure of the quorum-sensing protein TraM and its interaction with the transcriptional regulator TraR.Semantic proximity Read ↗

Identification of amino acid residues of the Agrobacterium tumefaciens quorum-sensing regulator TraR that are critical for positive control of transcription.Semantic proximity Read ↗

The quorum sensing transcriptional regulator TraR has separate binding sites for DNA and the anti-activator.Semantic proximity Read ↗

TraM of plasmid R1 controls transfer gene expression as an integrated control element in a complex regulatory network.Semantic proximity Read ↗

Mutational analysis of TraM correlates oligomerization and DNA binding with autoregulation and conjugative DNA transfer.Semantic proximity Read ↗

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