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Infection and Immunity, June 2002, p. 3271-3276, Vol. 70, No. 6
0019-9567/02/$04.00+0     DOI: 10.1128/IAI.70.6.3271-3276.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Relationship of Yersinia pseudotuberculosis O Antigens IA, IIA, and IVB: the IIA Gene Cluster Was Derived from That of IVB

Department of Microbiology, The University of Sydney, Sydney, New South Wales 2006, Australia

Received 20 September 2001/ Returned for modification 6 November 2001/ Accepted 15 February 2002

O antigen is part of the lipopolysaccharide present in the outer membrane of gram-negative bacteria and is highly polymorphic. In this study, we obtained sequences of the O-antigen gene clusters for the Yersinia pseudotuberculosis antigens IA, IIA, and IVB. We propose that the IIA gene cluster was derived from the IVB cluster, one of the very few cases in which a parent gene cluster is identified, and that the IA gene cluster could be a hybrid of the IVB and IB gene clusters. All three O antigens contain 6-deoxy-D-mannoheptose, and we identified six genes for the biosynthetic pathway for the precursor of this sugar, GDP-6-deoxy-D-mannoheptose.

Editor: D. L. Burns

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