The major outer membrane protein of Haemophilus ducreyi consists of two OmpA homologs

Julia Klesney-Tait, Thomas J. Hiltke, Isobel Maciver, Stanley Spinola, Justin D. Radolf, Eric J. Hansen

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

The major outer membrane protein (MOMP) of Haemophilus ducreyi is an OmpA homolog that migrates on sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) gels as three species with apparent molecular weights ranging from 37,000 to 43,000. Monoclonal antibodies directed against this macromolecule were used to identify recombinant clones containing fragments of the gene encoding this protein. Nucleotide sequence analysis of these fragments confirmed that the MOMP encoded by the intact gene (momp) was a member of the OmpA family of outer membrane proteins. Construction of an isogenic H. ducreyi mutant unable to express the MOMP led to the discovery of a second outer membrane protein which migrated at the same rote on SDS-PAGE gels as the MOMP. N-terminal amino acid sequence analysis of this second protein revealed that its N terminus was nearly identical to that of the MOMP and also had homology with members of the OmpA family. Nucleotide sequence analysis of the region downstream from the momp gene revealed the presence of a partial open reading frame encoding a predicted OmpA-like protein. A modification of anchored PCR technology was used to obtain the nucleotide sequence of this downstream gene which was shown to encode a second OmpA homolog (OmpA2). The N-terminal amino acid sequence of OmpA2 was identical to that of the OmpA-like protein detected in the momp mutant. The H. ducreyi MOMP and OmpA2 proteins, which comigrated on SDS-PAGE gels and which were encoded by the tandem arranged momp and ompA2 genes, were 72% identical.

Original languageEnglish
Pages (from-to)1764-1773
Number of pages10
JournalJournal of Bacteriology
Volume179
Issue number5
StatePublished - 1997

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Haemophilus ducreyi
Membrane Proteins
Sodium Dodecyl Sulfate
Polyacrylamide Gel Electrophoresis
Gels
Genes
Sequence Analysis
Proteins
Protein Sequence Analysis
Open Reading Frames
Amino Acid Sequence
Clone Cells
Molecular Weight
Monoclonal Antibodies
Technology
Polymerase Chain Reaction

ASJC Scopus subject areas

  • Applied Microbiology and Biotechnology
  • Immunology

Cite this

Klesney-Tait, J., Hiltke, T. J., Maciver, I., Spinola, S., Radolf, J. D., & Hansen, E. J. (1997). The major outer membrane protein of Haemophilus ducreyi consists of two OmpA homologs. Journal of Bacteriology, 179(5), 1764-1773.

The major outer membrane protein of Haemophilus ducreyi consists of two OmpA homologs. / Klesney-Tait, Julia; Hiltke, Thomas J.; Maciver, Isobel; Spinola, Stanley; Radolf, Justin D.; Hansen, Eric J.

In: Journal of Bacteriology, Vol. 179, No. 5, 1997, p. 1764-1773.

Research output: Contribution to journalArticle

Klesney-Tait, J, Hiltke, TJ, Maciver, I, Spinola, S, Radolf, JD & Hansen, EJ 1997, 'The major outer membrane protein of Haemophilus ducreyi consists of two OmpA homologs', Journal of Bacteriology, vol. 179, no. 5, pp. 1764-1773.
Klesney-Tait J, Hiltke TJ, Maciver I, Spinola S, Radolf JD, Hansen EJ. The major outer membrane protein of Haemophilus ducreyi consists of two OmpA homologs. Journal of Bacteriology. 1997;179(5):1764-1773.
Klesney-Tait, Julia ; Hiltke, Thomas J. ; Maciver, Isobel ; Spinola, Stanley ; Radolf, Justin D. ; Hansen, Eric J. / The major outer membrane protein of Haemophilus ducreyi consists of two OmpA homologs. In: Journal of Bacteriology. 1997 ; Vol. 179, No. 5. pp. 1764-1773.
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