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1999•FEMS Microbiology LettersRequires access

Expression of type I pili is abolished in verotoxin-producing Escherichia coli O157

Masatoshi Enami

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Abstract

Verotoxin-producing Escherichia coli (VTEC) were examined for production of type I pili. None of 34 strains of VTEC serogroup O157 examined expressed any pili, whereas 26 strains of 27 VTEC serogroup O26 and seven strains of nine non-VTEC O157 produced type I pili. These VTEC strains were collected from sporadic human cases and cattle in Okinawa in 1997. The genes encoding the major structural component (FimA) and the adhesin (FimH) of type I pili were detected in all 70 strains examined. The inability to express type I pili could be a unique character of VTEC O157 and this trait could be a new candidate to identify the organisms.

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What this paper is about

Verotoxin-producing Escherichia coli (VTEC) were examined for production of type I pili. None of 34 strains of VTEC serogroup O157 examined expressed any pili, whereas 26 strains of 27 VTEC serogroup O26 and seven strains of nine non-VTEC O157 produced type I pili. These VTEC strains were collected from sporadic human cases and cattle in Okinawa in 1997. The genes encoding the major structural component (FimA) and the adhesin (FimH) of type I pili were detected in all 70 strains examined. The inability to express type I pili could be a unique character of VTEC O157 and this trait could be a new candidate to identify the organisms.

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Available abstract

Verotoxin-producing Escherichia coli (VTEC) were examined for production of type I pili. None of 34 strains of VTEC serogroup O157 examined expressed any pili, whereas 26 strains of 27 VTEC serogroup O26 and seven strains of nine non-VTEC O157 produced type I pili. These VTEC strains were collected from sporadic human cases and cattle in Okinawa in 1997. The genes encoding the major structural component (FimA) and the adhesin (FimH) of type I pili were detected in all 70 strains examined. The inability to express type I pili could be a unique character of VTEC O157 and this trait could be a new candidate to identify the organisms.

Key concepts: VTEC, Pilus, Escherichia coli, Microbiology, Biology, Bacterial adhesin, Enterobacteriaceae, Fimbriae Proteins

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