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Journal of Bacteriology, February 2003, p. 1470-1474, Vol. 185, No. 4
0021-9193/03/$08.00+0     DOI: 10.1128/JB.185.4.1470-1474.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Overrepresentation of a Gene Family Encoding Extracytoplasmic Solute Receptors in Bordetella

INSERM U447,¹ CNRS UMR 8525, Institut de Biologie de Lille, Institut Pasteur de Lille, 59019 Lille Cedex, France²

Received 16 September 2002/ Accepted 12 November 2002

A family of genes that are likely to encode extracytoplasmic solute receptors is strongly overrepresented in several ß-proteobacteria, including Bordetella pertussis. This gene family, of which members have been called bug genes, contains some examples that are contained within polycistronic operons coding for tripartite uptake transporters of the TTT family, while the vast majority are "orphan" genes. Proteomic and functional analyses demonstrated that several of these genes are expressed in B. pertussis, and one is involved in citrate uptake. The bug genes probably form an ancient family that has been subjected to a large expansion in a restricted phylogenic group.

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