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Identification of two genes with prepilin-like leader sequences involved in type 4 fimbrial biogenesis in Pseudomonas aeruginosa.

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  • 1. Centre for Molecular and Cellular Biology, The University of Queensland, Australia.
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    • Alm RA 1
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Journal of Bacteriology, 01 Jul 1996, 178(13):3809-3817
https://doi.org/10.1128/jb.178.13.3809-3817.1996 PMID: 8682785 PMCID: PMC232641

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Abstract 

Type 4 fimbriae are surface filaments produced by a range of bacterial pathogens for colonization of host epithelial surfaces. In Pseudomonas aeruginosa, they are involved in adhesion as well as in a form of surface translocation called twitching motility, and sensitivity to infection by fimbria-specific bacteriophage. Analysis of the 2.5-kb intergenic region between the previously defined pilR and pilV genes on P. aeruginosa genomic SpeI fragment E has identified three new genes, fimT, fimU, and dadA*. The predicted 18.5-kDa products of the fimT and fimU genes contain prepilin-like leader sequences, whereas the third gene, dadA*, encodes a protein similar to the D-amino acid dehydrogenase of Escherichia coli. Isogenic mutants constructed by allelic exchange demonstrated that the fimU gene was required for fimbrial biogenesis and twitching motility, whereas the fimT and dada* mutants retained wild-type phenotypes. However, overexpression of the fimT gene was found to be able to functionally replace the lack of a fimU gene product, suggesting a subtle role in fimbrial biogenesis. The identification of these proteins increases the similarity between type 4 fimbrial biogenesis and the supersystems involved in macromolecular traffic, such as extracellular protein secretion and DNA uptake, all of which now possess multiple protein species that possess prepilin-like leader sequences.

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J Bacteriol. 1996 Jul; 178(13): 3809–3817.
PMCID: PMC232641
PMID: 8682785

Identification of two genes with prepilin-like leader sequences involved in type 4 fimbrial biogenesis in Pseudomonas aeruginosa.

R A Alm and J S Mattick
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Abstract

Type 4 fimbriae are surface filaments produced by a range of bacterial pathogens for colonization of host epithelial surfaces. In Pseudomonas aeruginosa, they are involved in adhesion as well as in a form of surface translocation called twitching motility, and sensitivity to infection by fimbria-specific bacteriophage. Analysis of the 2.5-kb intergenic region between the previously defined pilR and pilV genes on P. aeruginosa genomic SpeI fragment E has identified three new genes, fimT, fimU, and dadA*. The predicted 18.5-kDa products of the fimT and fimU genes contain prepilin-like leader sequences, whereas the third gene, dadA*, encodes a protein similar to the D-amino acid dehydrogenase of Escherichia coli. Isogenic mutants constructed by allelic exchange demonstrated that the fimU gene was required for fimbrial biogenesis and twitching motility, whereas the fimT and dada* mutants retained wild-type phenotypes. However, overexpression of the fimT gene was found to be able to functionally replace the lack of a fimU gene product, suggesting a subtle role in fimbrial biogenesis. The identification of these proteins increases the similarity between type 4 fimbrial biogenesis and the supersystems involved in macromolecular traffic, such as extracellular protein secretion and DNA uptake, all of which now possess multiple protein species that possess prepilin-like leader sequences.

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Selected References

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