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Volume 156, Issue 7

Regulation of the Kpc fimbriae by the site-specific recombinase KpcI Free

Abstract

In the genome of NTUH-K2044, nine fimbrial gene clusters were identified. Besides type 1 and type 3 fimbriae, the others are novel and were named Kpa, Kpb, Kpc, Kpd, Kpe, Kpf and Kpg fimbriae. Prevalence analysis among 105 clinical isolates revealed that the genes were highly associated with the K1 serotype isolates. Induced expression of the recombinant genes in resulted in Kpc fimbriation and increased biofilm formation. A putative site-specific recombinase encoding gene and a 302 bp intergenic DNA flanked by 11 bp inverted repeats, namely , were identified in the upstream region of the genes. Using LacZ as the reporter, a dramatic difference in promoter activity of in two different orientations was observed and accordingly assigned as ON and OFF phase. expression was found to be able to invert from phase ON to OFF and vice versa. Using the two-plasmid system, expression of , encoding the major component of the Kpc fimbriae, could be observed upon the induced expression of . These results indicate that KpcI is involved in the regulation of Kpc fimbriation in a phase-variable manner.

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  • Accepted:
  • Revised:
  • Published Online:
Keyword(s): KLA, Klebsiella liver abscess
SGM
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2010-07-01
2024-04-26
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Regulation of the Klebsiella pneumoniae Kpc fimbriae by the site-specific recombinase KpcI
Microbiology 156, 1983 (2010); https://doi.org/10.1099/mic.0.038158-0
/content/journal/micro/10.1099/mic.0.038158-0
/content/journal/micro/10.1099/mic.0.038158-0
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