Abstract
Chancroid is a sexually transmitted genital ulcer disease caused by Haemophilus ducreyi. Previously, we developed diagnostic DNA probes for H. ducreyi (L. M. Parsons, M. Shayegani, A. L. Waring, and L. H. Bopp, J. Clin. Microbiol. 27:1441-1445, 1989). In the present study, DNA sequencing of one of the diagnostic probes revealed two adjacent open reading frames (ORFs). These H. ducreyi ORFs and the encoded proteins show significant homology with the groE genes and GroES and GroEL heat shock proteins from several bacterial pathogens and with conserved eukaryotic 60-kDa heat shock proteins. The first H. ducreyi ORF (groES) is preceded by sequences similar to those of the Escherichia coli consensus heat shock promoters and is 288 nucleotides long and is capable of encoding a protein of 10.3 kDa. The second ORF (groEL) is 1,641 nucleotides long and is capable of encoding a protein of 57.8 kDa. Northern (RNA blot) analysis demonstrated the presence of a high level of groE mRNA in exponential-phase H. ducreyi grown in hemin broth at the organism's optimal growth temperature (33 degrees C), with increased levels seen following heat shock. Heat shock also increased the thermostability of the organisms, since stressed cells were more resistant to the lethal effects of rapid chilling. Electrophoretic analysis and immunoblots demonstrated that the predominant protein produced by exponential-phase H. ducreyi was a heat-inducible, immunoreactive protein of approximately 60 kDa (GroEL). Also, H. ducreyi groE mRNA and GroEL were expressed and inducible by heat in E. coli. This is the first report describing the cloning, sequencing, and expression of H. ducreyi protein-encoding genes.
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Selected References
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