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Infection and Immunity, June 2000, p. 3352-3361, Vol. 68, No. 6
0019-9567/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Construction and Characterization of Haemophilus ducreyi Lipooligosaccharide (LOS) Mutants Defective in Expression of Heptosyltransferase III and beta 1,4-Glucosyltransferase: Identification of LOS Glycoforms Containing Lactosamine Repeats

Melanie J. Filiatrault,1,2 Bradford W. Gibson,3 Birgit Schilling,3 Shuhua Sun,4,5 Robert S. Munson Jr.,4,5 and Anthony A. Campagnari1,2,6,*

Department of Microbiology,1 Department of Medicine, Division of Infectious Diseases,6 and Center for Microbial Pathogenesis,2 University at Buffalo, Buffalo, New York 14214; Department of Pharmaceutical Chemistry, University of California, San Francisco, California 94143-04463; and Children's Research Institute4 and Department of Molecular Virology, Immunology, and Medical Genetics,5 Ohio State University, Columbus, Ohio 43205-2696

To begin to understand the role of the lipooligosaccharide (LOS) molecule in chancroid infections, we constructed mutants defective in expression of glycosyltransferase genes. Pyocin lysis and immunoscreening was used to identify a LOS mutant of Haemophilus ducreyi 35000. This mutant, HD35000R, produced a LOS molecule that lacked the monoclonal antibody 3F11 epitope and migrated with an increased mobility on sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE). Structural studies indicated that the principal LOS glycoform contains lipid A, Kdo, and two of the three core heptose residues. HD35000R was transformed with a plasmid library of H. ducreyi 35000 DNA, and a clone producing the wild-type LOS was identified. Sequence analysis of the plasmid insert revealed one open reading frame (ORF) that encodes a protein with homology to the WaaQ (heptosyltransferase III) of Escherichia coli. A second ORF had homology to the LgtF (glucosyltransferase) of Neisseria meningitidis. Individual isogenic mutants lacking expression of the putative H. ducreyi heptosyltransferase III, the putative glucosyltransferase, and both glycosyltransferases were constructed and characterized. Each mutant was complemented with the representative wild-type genes in trans to restore expression of parental LOS and confirm the function of each enzyme. Matrix-assisted laser desorption ionization mass spectrometry and SDS-PAGE analysis identified several unique LOS glycoforms containing di-, tri-, and poly-N-acetyllactosamine repeats added to the terminal region of the main LOS branch synthesized by the heptosyltransferase III mutant. These novel H. ducreyi mutants provide important tools for studying the regulation of LOS assembly and biosynthesis.

* Corresponding author. Mailing address: Department of Microbiology, University at Buffalo, Biomedical Research Bldg. Rm. 143, 3435 Main St., Buffalo, NY 14214. Phone: (716) 829-2673. Fax: (716) 829-3889. E-mail: AAC{at}acsu.buffalo.edu.

Infection and Immunity, June 2000, p. 3352-3361, Vol. 68, No. 6
0019-9567/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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