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Flavobacterium psychrophilum is an important infectious Gram-negative bacterium causing cold-water disease (CWD) and rainbow trout fry syndrome. Outer-membrane proteins (OMPs) are key molecules with regard to the interface between the cell and its environment. Therefore, we sought to define the outer-membrane (OM) subproteome of F. psychrophilum in order to gain insight into the biology and pathogenesis of this bacterium and to identify the dominant antigens targeted by the rainbow trout (Oncorhynchus mykiss) immune system during infection. First, OMs were prepared from a cell-envelope suspension by differential Sarkosyl (sodium lauryl sarcosinate) solubility. We then isolated the OMPs and identified 36 proteins from 34 spots resolved by two-dimensional electrophoresis and LC-MS/MS. An immunoproteomic approach using antibodies from CWD-convalescent rainbow trout was then used to identify 25 immunoreactive F. psychrophilum antigens that may be relevant in pathogenesis and diagnosis. These included the previously characterized surface-exposed OMPs OmpA, OmpH/P18 and FspA, as well as newly described antigenic proteins. This study provides a number of novel candidate proteins for developing vaccine(s) against flavobacteriosis infection in aquaculture.

Analysis of the Flavobacterium psychrophilum outer-membrane subproteome and identification of new antigenic targets for vaccine by immunomics