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Microbiology 147 (2001), 599-610
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Microbiology (2001), 147, 599-610.
© 2001 Society for General Microbiology

Systematics and Evolution

Molecular evolution of the GDP-mannose pathway genes (manB and manC) in Salmonella enterica

Slade O. Jensen1 and Peter R. Reeves1

Department of Microbiology (G08), University of Sydney, New South Wales 2006, Australia1

Author for correspondence: Peter R. Reeves. Tel: +61 2 9351 2536. Fax: +61 2 9351 4571. e-mail: reeves{at}angis.usyd.edu.au

The evolutionary history of the GDP-mannose pathway in Salmonella enterica was studied via sequencing manB and manC genes from 13 representative strains for O antigens containing mannose and/or sugar derivatives of GDP-D-mannose. In addition, colanic acid (CA) manB and manC genes were sequenced from selected strains, as the basis for a detailed comparison. Interestingly, including the eight previously characterized O antigen gene clusters, 12 of the 21 S. enterica strains studied in total (each representing a different O antigen structure) possess a manB gene which displays DNA identity, ranging from 93 to 99%, to the CA manB gene of S. enterica LT2. Furthermore, the CA-like manB genes (as well as the CA manB and manC genes) display subspecies specificity, and the CA and CA-like manB genes (for individual strains) appear to be evolving in concert via gene conversion events. In comparison, the manC genes were generally not CA-like, a situation also apparent in Escherichia coli,and therefore most strongly reflected the evolutionary history of the S. enterica Oantigen GDP-mannose pathway. It appears that, in relatively recent times, gene capture from a distant source has occurred infrequently, and that groups of manB and manC genes have been maintained and are continuing to evolve within S. enterica and more closely related species.

Keywords: concerted evolution, GDP-D-mannose pathway, gene conversion, lateral transfer, Salmonella enterica

Abbreviations: CA, colanic acid

The GenBank accession numbers for the sequences reported in this paper are AY012160–AY012201.




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