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Journal of Bacteriology, October 2006, p. 7321-7324, Vol. 188, No. 20
0021-9193/06/$08.00+0     doi:10.1128/JB.00649-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

A Plasmid-Borne Truncated luxI Homolog Controls Quorum-Sensing Systems and Extracellular Carbohydrate Production in Methylobacterium extorquens AM1

Carlos G. Nieto Penalver,1 Franck Cantet,1 Danièle Morin,2 Dominique Haras,2 and Julia A. Vorholt1*

Laboratoire des Interaction Plantes Micro-organismes, INRA/CNRS, BP52627, 31326 Castanet-Tolosan, France,1 Laboratoire de Biotechnologie et Chimie Marines, 56321 Lorient, France2

Received 6 May 2006/ Accepted 3 August 2006

A cryptic plasmid of Methylobacterium extorquens AM1 was found to encode tslI, a truncated luxI homolog. tslI was shown to be expressed and to control transcription of the acyl-homoserine lactone (HSL) synthase gene msaI and thus, indirectly, acyl-HSL production. In addition, tslI was found to positively regulate extracellular polysaccharide production.

* Corresponding author. Present address: Institute of Microbiology, Swiss Federal Institute of Technology Zurich, ETH Hönggerberg, Zurich, Switzerland. Phone: 41-44-632-5524. Fax: 41-44-663-1307. E-mail: vorholt{at}micro.biol.ethz.ch.

Journal of Bacteriology, October 2006, p. 7321-7324, Vol. 188, No. 20
0021-9193/06/$08.00+0     doi:10.1128/JB.00649-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.





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