Molecular cloning of a gene involved in lipooligosaccharide biosynthesis and virulence expression by Haemophilus influenzae type B

L. D. Cope, R. Yogev, J. Mertsola, J. L. Latimer, M. S. Hanson, G. H. McCracken, E. J. Hansen

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

A wild-type Haemophilus influenzae type b (Hib) genomic DNA library was constructed in the plasmid shuttle vector pGJE103. A virulence-deficient lipooligosaccharide (LOS) mutant of Hib was used as a recipient for genetic transformation to screen this Hib genomic DNA library for genes involved in LOS expression. A recombinant plasmid containing a 7.8 kb PstI fragment of Hib DNA was shown to transform this LOS mutant to reactivity with a monoclonal antibody (mAb) specific for a wild-type LOS epitope. Transformation of two different virulence-deficient LOS mutants with a 4.4 kb BglII fragment of this recombinant plasmid yielded transformants which expressed LOS that bound the wild-type LOS-specific mAb and yielded profiles in sodium dodecyl sulphate/polyacrylamide gradient gel electrophoresis different from those of the original LOS mutants. These transformants with structurally altered LOS molecules also exhibited increased virulence in an animal model for invasive Hib disease. The virulence-transforming ability was further localized to a 1.8 kb BglII-AlwNI fragment of the Hib DNA insert. Nucleotide sequence analysis indicated the presence of a single large open reading frame within this fragment. This open reading frame contained 19 consecutive repeats of the tetramer CAAT near the 5' end. Linker insertion mutagenesis was used to demonstrate directly the involvement of this open reading frame in both LOS biosynthesis and virulence expression by Hib.

Original languageEnglish (US)
Pages (from-to)1113-1124
Number of pages12
JournalMolecular Microbiology
Volume5
Issue number5
StatePublished - 1991

Fingerprint

Haemophilus influenzae
Molecular Cloning
Haemophilus influenzae type b
Virulence
Genes
Open Reading Frames
Plasmids
Genomic Library
Gene Library
Monoclonal Antibodies
lipid-linked oligosaccharides
Genetic Transformation
Genetic Vectors
Insertional Mutagenesis
DNA
Sodium Dodecyl Sulfate
Sequence Analysis
Epitopes
Polyacrylamide Gel Electrophoresis
Animal Models

ASJC Scopus subject areas

  • Molecular Biology
  • Microbiology

Cite this

Cope, L. D., Yogev, R., Mertsola, J., Latimer, J. L., Hanson, M. S., McCracken, G. H., & Hansen, E. J. (1991). Molecular cloning of a gene involved in lipooligosaccharide biosynthesis and virulence expression by Haemophilus influenzae type B. Molecular Microbiology, 5(5), 1113-1124.

Molecular cloning of a gene involved in lipooligosaccharide biosynthesis and virulence expression by Haemophilus influenzae type B. / Cope, L. D.; Yogev, R.; Mertsola, J.; Latimer, J. L.; Hanson, M. S.; McCracken, G. H.; Hansen, E. J.

In: Molecular Microbiology, Vol. 5, No. 5, 1991, p. 1113-1124.

Research output: Contribution to journalArticle

Cope, L. D. ; Yogev, R. ; Mertsola, J. ; Latimer, J. L. ; Hanson, M. S. ; McCracken, G. H. ; Hansen, E. J. / Molecular cloning of a gene involved in lipooligosaccharide biosynthesis and virulence expression by Haemophilus influenzae type B. In: Molecular Microbiology. 1991 ; Vol. 5, No. 5. pp. 1113-1124.
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