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Infection and Immunity, July 2001, p. 4458-4464, Vol. 69, No. 7
0019-9567/01/$04.00+0   DOI: 10.1128/IAI.69.7.4458-4464.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Analysis of the Capsule Biosynthetic Locus of Mannheimia (Pasteurella) haemolytica A1 and Proposal of a Nomenclature System

Reggie Y. C. Lo,* Linda J. McKerral, Tanya L. Hills, and Magdalena Kostrzynska

Department of Microbiology, University of Guelph, Guelph, Ontario N1G 2W1, Canada

Received 18 August 2000/Returned for modification 4 October 2000/Accepted 11 April 2001

A 16-kbp DNA region that contains genes involved in the biosynthesis of the capsule of Mannheimia (Pasteurella) haemolytica A1 has been characterized. The gene cluster can be divided into three regions like those of the typical group II capsule biosynthetic clusters in gram-negative bacteria. Region 1 contains four genes (wzt, wzm, wzf, and wza) which code for an ATP-binding cassette transport apparatus for the secretion of the capsule materials across the membranes. The M. haemolytica A1 wzt and wzm genes were able to complement Escherichia coli kpsT and kpsM mutants, respectively. Further, the ATP binding activity of Wzt was demonstrated by its affinity for ATP-agarose, and the lipoprotein nature of Wza was supported by [3H]palmitate labeling. Region 2 contains six genes; four genes (orf1/2/3/4) code for unique functions for which no homologues have been identified to date. The remaining two genes (nmaA and nmaB) code for homologues of UDP-N-acetylglucosamine-2-epimerase and UDP-N-acetylmannosamine dehydrogenase, respectively. These two proteins are highly homologous to the E. coli WecB and WecC proteins (formerly known as RffE and RffD), which are involved in the biosynthesis of enterobacterial common antigen (ECA). Complementation of an E. coli rffE/D mutant with the M. haemolytica A1 nmaA/B genes resulted in the restoration of ECA biosynthesis. Region 3 contains two genes (wbrA and wbrB) which are suggested to be involved in the phospholipid modification of capsular materials.

* Corresponding author. Mailing address: Department of Microbiology, University of Guelph, Guelph, Ontario N1G 2W1, Canada. Phone: (519) 824-4120, ext. 3363. Fax: (519) 837-1802. E-mail: RLO{at}micro.uoguelph.ca.

Infection and Immunity, July 2001, p. 4458-4464, Vol. 69, No. 7
0019-9567/01/$04.00+0   DOI: 10.1128/IAI.69.7.4458-4464.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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