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Applied and Environmental Microbiology, April 2002, p. 1624-1630, Vol. 68, No. 4
0099-2240/02/$04.00+0     DOI: 10.1128/AEM.68.4.1624-1630.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

The ybiT Gene of Erwinia chrysanthemi Codes for a Putative ABC Transporter and Is Involved in Competitiveness against Endophytic Bacteria during Infection

Arancha Llama-Palacios, Emilia López-Solanilla, and Pablo Rodríguez-Palenzuela*

Departamento de Biotecnología-UPM, E.T.S. Ingenieros Agrónomos, E-28040 Madrid, Spain

Received 9 August 2001/ Accepted 22 December 2001

We investigated the role in bacterial infection of a putative ABC transporter, designated ybiT, of Erwinia chrysanthemi AC4150. The deduced sequence of this gene showed amino acid sequence similarity with other putative ABC transporters of gram-negative bacteria, such as Escherichia coli and Pseudomonas aeruginosa, as well as structural similarity with proteins of Streptomyces spp. involved in resistance to macrolide antibiotics. The gene contiguous to ybiT, designated as pab (putative antibiotic biosynthesis) showed sequence similarity with Pseudomonas and Streptomyces genes involved in the biosynthesis of antibiotics. A ybiT mutant (BT117) was constructed by marker exchange. It retained full virulence in potato tubers and chicory leaves, but it showed reduced ability to compete in planta against the wild-type strain or against selected saprophytic bacteria. These results indicate that the ybiT gene plays a role in the in planta fitness of the bacteria.

* Corresponding author. Mailing address: ETS Ingenieros Agrónomos, E-28040 Madrid, Spain. Phone: 34-91-3365705. Fax: 34-91-3365757. E-mail: pablo{at}bit.etsia.upm.es.

Applied and Environmental Microbiology, April 2002, p. 1624-1630, Vol. 68, No. 4
0099-2240/02/$04.00+0     DOI: 10.1128/AEM.68.4.1624-1630.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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