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Journal of Bacteriology, April 2006, p. 2706-2710, Vol. 188, No. 7
0021-9193/06/$08.00+0     doi:10.1128/JB.188.7.2706-2710.2006
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

Analysis of the PixA Inclusion Body Protein of Xenorhabdus nematophila

Department of Biological Sciences, University of Wisconsin, Milwaukee, Wisconsin 53201,¹ Monsanto Company, St. Louis, Missouri 63167²

Received 26 October 2005/ Accepted 10 January 2006

The symbiotic pathogenic bacterium Xenorhabdus nematophila produces two distinct intracellular inclusion bodies. The pixA gene, which encodes the 185-residue methionine-rich PixA inclusion body protein, was analyzed in the present study. The pixA gene was optimally expressed under stationary-phase conditions but its expression did not require RpoS. Analysis of a pixA mutant strain showed that PixA was not required for virulence towards the insect host or for colonization of or survival within the nematode host, and was not essential for nematode reproduction. The pixA gene was not present in the genome of Xenorhabdus bovienii, which also produces proteinaceous inclusions, indicating that PixA is specifically produced in X. nematophila.

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