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Infect Immun. May 1995; 63(5): 2026–2032.
PMCID: PMC173260

Adherence properties of an mrkD-negative mutant of Klebsiella pneumoniae.

Abstract

The role of the mrkD gene in attachment by a type 3 fimbriate Klebsiella pneumoniae strain was further characterized. A clinical isolate, K. pneumoniae IA565, was found to contain two copies of the gene encoding the fimbrial subunit, mrkA, and one copy of the gene encoding the adhesin subunit, mrkD. One copy of mrkA was located on the bacterial chromosome, and the other copy was associated with mrkD and located on a plasmid. The plasmid-borne mrk gene cluster was lost when K. pneumoniae IA565 was subcultured serially in broth at 44 degrees C. The resulting mrkD-negative strain, designated K. pneumoniae IApc35, did not exhibit the following adherence characteristics associated with K. pneumoniae possessing MrkD-positive fimbriae: agglutination of tannic acid-treated human erythrocytes and attachment to trypsinized human buccal cells. However, K. pneumoniae IApc35 produced type 3 fimbriae that were composed of the characteristic 21.5-kDa major fimbrial subunit, were reactive with specific serum, and were visualized specifically by immunoelectron microscopy. K. pneumoniae IApc35 retained a copy of the mrkA gene on its chromosome. This mrkA-containing gene cluster could be complemented by a recombinant plasmid carrying only the mrkD gene, resulting in restoration of the K. pneumoniae IA565-like adhesive phenotype and demonstration of type 3 filament-associated MrkD subunits by using colloidal gold labeling and immunoelectron microscopy. These data indicate that K. pneumoniae may contain multiple copies of the mrk genes which may be present simultaneously on both plasmid and chromosomal DNAs and which may encode fimbriae with different binding specificities.

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Selected References

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