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Molecular Pathogenesis

Functional Characterization of Two Type III Secretion Systems of Vibrio parahaemolyticus

Kwon-Sam Park, Takahiro Ono, Mitsuhiro Rokuda, Myoung-Ho Jang, Kazuhisa Okada, Tetsuya Iida, Takeshi Honda
Kwon-Sam Park
1Department of Bacterial Infections
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Takahiro Ono
1Department of Bacterial Infections
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Mitsuhiro Rokuda
1Department of Bacterial Infections
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Myoung-Ho Jang
2Department of Mucosal Immunology, Research Institute for Microbial Diseases, Osaka University, Suita, Osaka, Japan
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Kazuhisa Okada
1Department of Bacterial Infections
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Tetsuya Iida
1Department of Bacterial Infections
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  • For correspondence: iida@biken.osaka-u.ac.jp
Takeshi Honda
1Department of Bacterial Infections
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DOI: 10.1128/IAI.72.11.6659-6665.2004
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ABSTRACT

Vibrio parahaemolyticus, a gram-negative marine bacterium, is a worldwide cause of food-borne gastroenteritis. Recent genome sequencing of the clinical V. parahaemolyticus strain RIMD2210633 identified two sets of genes for the type III secretion system (TTSS), TTSS1 and TTSS2. Here, we constructed a series of mutant strains from RIMD2210633 to determine whether the two putative TTSS apparatus are functional. The cytotoxic activity of mutant strains having a deletion in one of the TTSS1 genes was significantly decreased compared with that of the parent and TTSS2-related mutant strains. In an enterotoxicity assay with the rabbit ileal loop test, intestinal fluid accumulation was diminished by deletion of the TTSS2-related genes while TTSS1-related mutants caused a level of fluid accumulation similar to that of the parent. VopD, a protein encoded in the proximity of the TTSS1 region and a homologue of the Yersinia YopD, was secreted in a TTSS1-dependent manner. In contrast, VopP, which is encoded by a pathogenicity island on chromosome 2 and is homologous to the Yersinia YopP, was secreted via the TTSS2 pathway. These results provide evidence that V. parahaemolyticus TTSSs function as secretion systems and may have a role in the pathogenicity of the organism. This is the first report of functional TTSSs in Vibrio species. The presence of TTSS apparatus gene homologues was demonstrated in other vibrios, such as Vibrio alginolyticus, Vibrio harveyi, and Vibrio tubiashii, suggesting that some other vibrios also contain TTSS and that the TTSS has a role in protein secretion in those organisms during interaction with eukaryotic cells.

  • Copyright © 2004 American Society for Microbiology
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Functional Characterization of Two Type III Secretion Systems of Vibrio parahaemolyticus
Kwon-Sam Park, Takahiro Ono, Mitsuhiro Rokuda, Myoung-Ho Jang, Kazuhisa Okada, Tetsuya Iida, Takeshi Honda
Infection and Immunity Oct 2004, 72 (11) 6659-6665; DOI: 10.1128/IAI.72.11.6659-6665.2004

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Functional Characterization of Two Type III Secretion Systems of Vibrio parahaemolyticus
Kwon-Sam Park, Takahiro Ono, Mitsuhiro Rokuda, Myoung-Ho Jang, Kazuhisa Okada, Tetsuya Iida, Takeshi Honda
Infection and Immunity Oct 2004, 72 (11) 6659-6665; DOI: 10.1128/IAI.72.11.6659-6665.2004
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KEYWORDS

Bacterial Proteins
Gene Expression Regulation, Bacterial
Vibrio Infections
Vibrio parahaemolyticus

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