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Intimin ist ein Protein, das von pathogene … Intimin ist ein Protein, das von pathogenen Escherichia coli-Stämmen und Bakterien der Art Citrobacter durch Sekretion ausgeschieden wird. Es ist notwendig für das Kleben (Adhärenz) des Bakteriums an der Darmmucosa, so dass es zu den Adhäsinen zählt. Außerdem fungiert es als Membrankanal in Darmzellen, mit dessen Hilfe das Bakterium weitere Proteine einschleusen kann. Intimin gelangt mit Hilfe des Typ-III-Sekretionssystems an die Oberfläche der Bakterienzelle. Für den zu Läsionen führenden Gesamtvorgang sind weitere Proteine des Bakteriums erforderlich. Intimin gehört zu einer Familie von Transportproteinen, zu der auch das Invasin von Yersinia-Bakterien gezählt wird.vasin von Yersinia-Bakterien gezählt wird.
, Intimin is a virulence factor (adhesin) of … Intimin is a virulence factor (adhesin) of EPEC (e.g. E. coli ) and EHEC (e.g. E. coli O157:H7) E. coli strains. It is an attaching and effacing (A/E) protein, which with other virulence factors is necessary and responsible for enteropathogenic and enterohaemorrhagic diarrhoea. Intimin is expressed on the bacterial cell surface where it can bind to its receptor Tir (Translocated intimin receptor). Tir, along with over 25 other bacterial proteins, is secreted from attaching and effacing E. coli directly into the cytoplasm of intestinal epithelial cells by a Type three secretion system. Once within the cytoplasm of the host cell, Tir is inserted into the plasma membrane, allowing surface exposure and intimin binding. Tir-intimin interaction mediates tight binding of enteropathogenic and enterohaemorrhagic E.coli to the intestinal epithelia, resulting in the formation of effacing lesions on intestinal epithelia. The structure of the C-terminal domain has been solved and shown to have a C-lectin type of structure. It is the C-terminal domain that mediates attachment to Tir. It is a 94 kDa outer membrane protein encoded by eaeA gene in the locus of enterocyte effacement (LEE), a 35-Kb pathogenicity island. Mutations in the eaeA gene result in loss of ability to cause A/E lesions, and is required for full virulence in infected volunteers and animal models. The N-terminal domains of intimin from A/E lesion forming pathogens have high homology with each other and to invasin from Yersinia pseudotuberculosis and Yersinia enterocolitica, whereas the C-terminal domains show less homology. Antibodies to intimin are present in: 1.
* Immune colostrum from mothers in EPEC endemic areas 2.
* The serum of EPEC/EHEC infected children and EPEC infected volunteers 3.
* Secretions of Citrobacter rodentium infected mice.ns of Citrobacter rodentium infected mice.
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nmr representative structure of intimin-190 from enteropathogenic e. coli
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IPR013117
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| rdfs:comment |
Intimin is a virulence factor (adhesin) of … Intimin is a virulence factor (adhesin) of EPEC (e.g. E. coli ) and EHEC (e.g. E. coli O157:H7) E. coli strains. It is an attaching and effacing (A/E) protein, which with other virulence factors is necessary and responsible for enteropathogenic and enterohaemorrhagic diarrhoea. The structure of the C-terminal domain has been solved and shown to have a C-lectin type of structure. It is the C-terminal domain that mediates attachment to Tir. Antibodies to intimin are present in:Tir. Antibodies to intimin are present in:
, Intimin ist ein Protein, das von pathogene … Intimin ist ein Protein, das von pathogenen Escherichia coli-Stämmen und Bakterien der Art Citrobacter durch Sekretion ausgeschieden wird. Es ist notwendig für das Kleben (Adhärenz) des Bakteriums an der Darmmucosa, so dass es zu den Adhäsinen zählt. Außerdem fungiert es als Membrankanal in Darmzellen, mit dessen Hilfe das Bakterium weitere Proteine einschleusen kann. Intimin gelangt mit Hilfe des Typ-III-Sekretionssystems an die Oberfläche der Bakterienzelle. Für den zu Läsionen führenden Gesamtvorgang sind weitere Proteine des Bakteriums erforderlich.tere Proteine des Bakteriums erforderlich.
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Intimin
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