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CSF, a Species-Specific Extracellular Signaling Peptide for Communication among Strains of Bacillus subtilis and Bacillus mojavensis

Mridula Pottathil, April Jung, and Beth A. Lazazzera^*

Department of Microbiology, Immunology, and Molecular Genetics, David Geffen School of Medicine, University of California, Los Angeles, 405 Hilgard Avenue, Los Angeles, California 90095

Received 6 February 2008/ Accepted 16 March 2008

ComX and CSF are Bacillus subtilis extracellular signaling peptides. Many different strains of B. subtilis do not communicate due to strain-specific variation of ComX. We demonstrate that CSF is a species-specific signaling molecule that partially compensates for the lack of ComX-mediated communication between different strains of B. subtilis.

Published ahead of print on 28 March 2008.

Present address: XLTech Group, 1901 S. Harbor City Blvd., Ste. 600, Melbourne, FL 32901.

Present address: St. Mary Medical Center, 1050 Linden Ave., Long Beach, CA 90813.