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Applied and Environmental Microbiology, August 2003, p. 4989-4993, Vol. 69, No. 8
0099-2240/03/$08.00+0     DOI: 10.1128/AEM.69.8.4989-4993.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

The Ti Plasmid of Agrobacterium tumefaciens Harbors an attM-Paralogous Gene, aiiB, Also Encoding N-Acyl Homoserine Lactonase Activity

A. Carlier,1 S. Uroz,1 B. Smadja,2 R. Fray,3 X. Latour,2 Y. Dessaux,1 and D. Faure1*

Institut des Sciences du Végétal, Centre National de la Recherche Scientifique, Gif-sur-Yvette,1 Laboratoire de Microbiologie du Froid, Université de Rouen, Evreux, France,2 School of Biosciences, Nottingham University, Loughborough, United Kingdom3

Received 10 January 2003/ Accepted 9 June 2003

The Agrobacterium tumefaciens C58 genome contains three putative N-acyl homoserine lactone (acyl-HSL) hydrolases, which are closely related to the lactonase AiiA of Bacillus. When expressed in Escherichia coli, two of the putative acyl-HSL hydrolases, AttM and AiiB, conferred the ability to degrade acyl-HSLs on the host. In Erwinia strain 6276, the lactonases reduced the endogenous acyl-HSL level and the bacterial virulence in planta.

* Corresponding author. Mailing address: Institut des Sciences du Végétal, UPR2355, Centre National de la Recherche Scientifique, Av. de la Terrasse, 91 198 Gif-sur-Yvette Cedex, France. Phone: (33) 1 69 82 35 77. Fax: (33) 1 69 82 36 95. E-mail: faure{at}isv.cnrs-gif.fr.

Applied and Environmental Microbiology, August 2003, p. 4989-4993, Vol. 69, No. 8
0099-2240/03/$08.00+0     DOI: 10.1128/AEM.69.8.4989-4993.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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