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Applied and Environmental Microbiology, August 2005, p. 4906-4909, Vol. 71, No. 8
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.8.4906-4909.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

SHORT REPORT

Identification of Acyl-Homoserine Lactone Signal Molecules Produced by Nitrosomonas europaea Strain Schmidt{dagger}

E. O. Burton,1 H. W. Read,2 M. C. Pellitteri,2 and W. J. Hickey1,2*

Molecular and Environmental Toxicology Center,1 Department of Soil Science, University of Wisconsin—Madison, Madison, Wisconsin2

Received 15 November 2004/ Accepted 16 March 2005

Nitrosomonas europaea strain Schmidt produces at least three acyl homoserine lactone (AHL) signal molecules: C6-homoserine lactone (HSL), C8-HSL, and C10-HSL. These compounds were identified in extracts of chemostat culture effluent by three independent methods. The concentrations of AHL in effluent were low (0.4 to 2.2 nM) but within the range known to induce AHL-responsive systems. The absence of LuxI and LuxM homologs from the genome of N. europaea strain Schmidt suggested that AHL synthesis occurs by an alternate pathway, possibly mediated by an HdtS homolog. To the best of our knowledge, the present report is the first to document the types and levels of AHLs produced by N. europaea.

* Corresponding author. Mailing address: Department of Soil Science, University of Wisconsin—Madison, Madison, WI 53706-1299. Phone: (608) 262-9018. Fax: (608) 265-2595. E-mail: wjhickey{at}wisc.edu.

{dagger} Contribution 364 from the University of Wisconsin—Madison Molecular and Environmental Toxicology Center

Applied and Environmental Microbiology, August 2005, p. 4906-4909, Vol. 71, No. 8
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.8.4906-4909.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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