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Microb Cell Fact. 2011 Aug 30;10 Suppl 1:S16. doi: 10.1186/1475-2859-10-S1-S16. Epub 2011 Aug 30.

Genetic analysis and morphological identification of pilus-like structures in members of the genus Bifidobacterium.

Author information

1
Laboratory of Probiogenomics, Department of Genetics, Biology of Microorganisms, Anthropology and Evolution, University of Parma, Italy.

Abstract

BACKGROUND:

Cell surface pili in Gram positive bacteria have been reported to orchestrate the colonization of host tissues, evasion of immunity and the development of biofilms. So far, little if any information is available on the presence of pilus-like structures in human gut commensals like bifidobacteria.

RESULTS AND DISCUSSION:

In this report, Atomic Force Microscopy (AFM) of various bifidobacterial strains belonging to Bifidobacterium bifidum, Bifidobacterium longum subsp. longum, Bifidobacterium dentium, Bifidobacterium adolescentis and Bifidobacterium animalis subsp. lactis revealed the existence of appendages resembling pilus-like structures. Interestingly, these microorganisms harbour two to six predicted pilus gene clusters in their genome, with each organized in an operon encompassing the major pilin subunit-encoding gene (designated fimA or fimP) together with one or two minor pilin subunit-encoding genes (designated as fimB and/or fimQ), and a gene encoding a sortase enzyme (strA). Quantitative Real Time (qRT)-PCR analysis and RT-PCR experiments revealed a polycistronic mRNA, encompassing the fimA/P and fimB/Q genes, which are differentially expressed upon cultivation of bifidobacteria on various glycans.

PMID:
21995649
PMCID:
PMC3231923
DOI:
10.1186/1475-2859-10-S1-S16
[Indexed for MEDLINE]
Free PMC Article

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