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Logo of bmcgenoBioMed Centralsearchsubmit a manuscriptregisterthis articleBMC Genomics
 
BMC Genomics. 2009; 10: 71.
Published online Feb 9, 2009. doi:  10.1186/1471-2164-10-71
PMCID: PMC2645431
Escherichia coli genes affecting recipient ability in plasmid conjugation: Are there any?
Daniel Pérez-Mendoza1,2 and Fernando de la Cruzcorresponding author1
1Departamento de Biología Molecular (Universidad de Cantabria) and Instituto de Biomedicina y Biotecnología de Cantabria (CSIC-UC-IDICAN), C/Herrera Oria s/n, 39011 Santander, Spain
2Department of Biochemistry, University of Cambridge, Cambridge, CB2 1QW, UK
corresponding authorCorresponding author.
Daniel Pérez-Mendoza: dp364/at/mole.bio.cam.ac.uk; Fernando de la Cruz: delacruz/at/unican.es
Received August 28, 2008; Accepted February 9, 2009.
Abstract
Background
How does the recipient cell contribute to bacterial conjugation? To answer this question we systematically analyzed the individual contribution of each Escherichia coli gene in matings using plasmid R388 as a conjugative plasmid. We used an automated conjugation assay and two sets of E. coli mutant collections: the Keio collection (3,908 E. coli single-gene deletion mutants) and a collection of 20,000 random mini-Tn10::Km insertion mutants in E. coli strain DH5α. The combined use of both collections assured that we screened > 99% of the E. coli non-essential genes in our survey.
Results
Results indicate that no non-essential recipient E. coli genes exist that play an essential role in conjugation. Mutations in the lipopolysaccharide (LPS) synthesis pathway had a modest effect on R388 plasmid transfer (6 – 32% of wild type). The same mutations showed a drastic inhibition effect on F-plasmid transfer, but only in liquid matings, suggesting that previously isolated conjugation-defective mutants do in fact impair mating pair formation in liquid mating, but not conjugative DNA processing or transport per se.
Conclusion
We conclude from our genome-wide screen that recipient bacterial cells cannot avoid being used as recipients in bacterial conjugation. This is relevant as an indication of the problems in curbing the dissemination of antibiotic resistance and suggests that conjugation acts as a pure drilling machine, with little regard to the constitution of the recipient cell.
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