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A Clostridium difficile gene encoding flagellin. | LitMetric

A Clostridium difficile gene encoding flagellin.

Microbiology (Reading)

PHLS Central Public Health Laboratory, 61 Colindale Ave, London NW9 5HT, UK3.

Published: April 2000

AI Article Synopsis

Article Abstract

Six strains of Clostridium difficile examined by electron microscopy were found to carry flagella. The flagella of these strains were extracted and the N-terminal sequences of the flagellin proteins were determined. Four of the strains carried the N-terminal sequence MRVNTNVSAL exhibiting up to 90% identity to numerous flagellins. Using degenerate primers based on the N-terminal sequence and the conserved C-terminal sequence of several flagellins, the gene encoding the flagellum subunit (fliC) was isolated and sequenced from two virulent strains. The two gene sequences exhibited 91% inter-strain identity. The gene consists of 870 nt encoding a protein of 290 amino acids with an estimated molecular mass of 31 kDa, while the extracted flagellin has an apparent molecular mass of 39 kDa on SDS-PAGE. The FliC protein displays a high degree of identity in the N- and C-terminal amino acids whereas the central region is variable. A second ORF is present downstream of fliC displaying homology to glycosyltransferases. The fliC gene was expressed in fusion with glutathione S-transferase, purified and a polyclonal monospecific antiserum was obtained. Flagella of C. difficile do not play a role in adherence, since the antiserum raised against the purified protein did not inhibit adherence to cultured cells. PCR-RFLP analysis of amplified flagellin gene products and Southern analysis revealed inter-strain heterogeneity; this could be useful for epidemiological and phylogenetic studies of this organism.

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http://dx.doi.org/10.1099/00221287-146-4-957DOI Listing

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