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Saberianfar, Reza; Chin-Fatt, Adam; Scott, Andrew; Henry, Kevin A; Topp, Edward; Menassa, Rima
Frontiers in plant science, 03/2019, Letnik: 10Journal Article
Enterohemorrhagic (EHEC) has consistently been one of the foremost foodborne pathogen threats worldwide based on the past 30 years of surveillance. EHEC primarily colonizes the bovine gastrointestinal (GI) tract from which it can be transmitted to nearby farm environments and remain viable for months. There is an urgent need for effective and easily implemented pre-harvest interventions to curtail EHEC contamination of the food and water supply. In an effort to address this problem, we isolated single-domain antibodies (V Hs) specific for intimin, an EHEC adhesin required for colonization, and designed chimeric V H fusions with secretory IgA functionality intended for passive immunotherapy at the mucosal GI surface. The antibodies were produced in leaves of with production levels ranging between 1 and 3% of total soluble protein. assembly of all subunits into a hetero-multimeric complex was verified by co-immunoprecipitation. Analysis of multivalent protection across the most prevalent EHEC strains identified one candidate antibody, V H10-IgA, that binds O145:Hnm, O111:Hnm, O26:H11, and O157:H7. Fluorometric and microscopic analysis also indicated that V H10-IgA completely neutralizes the capacity of the latter three strains to adhere to epithelial cells . This study provides proof of concept that a plant-produced chimeric secretory IgA can confer cross-serotype inhibition of bacterial adhesion to epithelial cells.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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