Secretion of virulence proteins from Campylobacter jejuni is dependent on a functional flagellar export apparatus

被引:248
作者
Konkel, ME [1 ]
Klena, JD [1 ]
Rivera-Amill, V [1 ]
Monteville, MR [1 ]
Biswas, D [1 ]
Raphael, B [1 ]
Mickelson, J [1 ]
机构
[1] Washington State Univ, Sch Mol Biosci, Pullman, WA 99164 USA
关键词
D O I
10.1128/JB.186.11.3296-3303.2004
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
Campylobacter jejuni, a gram-negative motile bacterium, secretes a set of proteins termed the Campylobacter invasion antigens (Cia proteins). The purpose of this study was to determine whether the flagellar apparatus serves as the export apparatus for the Cia proteins. Mutations were generated in five genes encoding three structural components of the flagella, the flagellar basal body (flgB and flgC), hook (flgE2), and filament (flaA and flaB) genes, as well as in genes whose products are essential for flagellar protein export (flhB and fliI). While mutations that affected filament assembly were found to be nonmotile (Mot(-)) and did not secrete Cia proteins (S-), a flaA (flaB(+)) filament mutant was found to be nonmotile but Cia protein secretion competent (Mot-, S'). Complementation of a flaA flaB double mutant with a shuttle plasmid harboring either the flaA or flaB gene restored Cia protein secretion, suggesting that Cia export requires at least one of the two filament proteins. Infection of INT 407 human intestinal cells with the C. jejuni mutants revealed that maximal invasion of the epithelial cells required motile bacteria that are secretion competent. Collectively, these data suggest that the C. jejuni Cia proteins are secreted from the flagellar export apparatus.
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页码:3296 / 3303
页数:8
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