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1 Molecular Infectious Diseases Group, University of Oxford Department of Paediatrics, Weatherall Institute of Molecular Medicine, John Radcliffe Hospital, Headington, Oxford OX3 9DS, UK
2 Institute for Biological Sciences, National Research Council of Canada, Ottawa, Ontario, Canada K1A 0R6
Correspondence
Derek W. Hood
dhood{at}molbiol.ox.ac.uk
The locus lex2, comprising lex2A and lex2B, contributes to the phase-variable expression of lipopolysaccharide (LPS) of Haemophilus influenzae and was found to be present in 74 % of strains investigated. lex2A contains 5'-GCAA repeats which vary in number from 4 to 46 copies between strains. The locus was cloned from the serotype b strains RM7004 and RM153 and showed >99 % nucleotide sequence identity between these strains and the published lex2 sequence. Disruption of the lex2B gene in strain RM7004 resulted in truncation of some LPS glycoforms, shown by gel fractionation, with only one glycoform reacting with a digalactoside-specific monoclonal antibody, 4C4, compared with four LPS glycoforms in the more elongated LPS of the parent strain. Mass spectrometry and NMR analyses of LPS from the lex2B mutant revealed loss of the terminal digalactoside as well as the second 
-glucose extending from the first heptose of the inner core. The authors conclude that Lex2B is the -(1-4)-glucosyltransferase that adds the second -glucose to the first -glucose as part of the oligosaccharide extension from the first heptose of the LPS of strain RM7004. Investigation of the expression of the lex2 locus indicated that the genes are co-transcribed and that both reading frames are required for addition of this second -glucose in a phase-variable manner.
The GenBank/EMBL/DDBJ accession number for the sequence reported in this paper is AF503507.
Present address: National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 1AA, UK.
This article has been cited by other articles:
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A. Harrison, D. W. Dyer, A. Gillaspy, W. C. Ray, R. Mungur, M. B. Carson, H. Zhong, J. Gipson, M. Gipson, L. S. Johnson, et al. Genomic Sequence of an Otitis Media Isolate of Nontypeable Haemophilus influenzae: Comparative Study with H. influenzae Serotype d, Strain KW20 J. Bacteriol., July 1, 2005; 187(13): 4627 - 4636. [Abstract] [Full Text] [PDF]
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