The novel type 1 fimbriae fimH receptor calreticulin plays a role in salmonella host specifically
Krzysztof Grzymajło , Maciej Ugorski , Jarosław Suchański , Anna Ewa Kędzierska , Rafał Kolenda , Anna Jarząb , Agnieszka Biernatowska , Peter Schierack
AbstractIt was suggested that minor differences in the structure of FimH are most likely associated with differences in its adhesion specificities and may determine the tropism of various Salmonella serovars to different species and tissues. We have recently shown that FimH adhesins from host-adapted serovars, e.g., Salmonella Choleraesuis (SCh), bind to other glycoprotein receptors compared to FimH from host-unrestricted Salmonella Enteritidis (SE). Here we identify porcine calreticulin expressed by swine intestinal cells as a host-specific receptor for SCh FimH adhesin, suggesting that such an interaction may contribute to SCh host specificity. Calreticulin was identified by 2D electrophoresis and mass spectrometry as a glycoprotein that was bound specifically by recombinant SCh FimH protein, but not by FimH from SE. The functionality of calreticulin as a specific receptor of SCh FimH adhesin was further confirmed by adhesion and invasion of mutated strains of SCh carrying different variants of FimH proteins to IPEC-J2 cells with overexpression and silenced expression of calreticulin. It was found that SCh carrying the active variant of FimH adhered and invaded IPEC-J2 cells with calreticulin overexpression at significantly higher numbers than those of SCh expressing the non-active variant or SE variant of FimH. Moreover, binding of SCh carrying the active variant of FimH to IPEC-J2 with silenced calreticulin expression was significantly weaker. Furthermore, we observed that SCh infection induces translocation of calreticulin to cell membrane. All of the aforementioned results lead to the general conclusion that Salmonella host specificity requires not only special mechanisms and proteins expressed by the pathogen but also specifically recognized receptors expressed by a specific host.
|Journal series||Frontiers in Cellular and Infection Microbiology, ISSN 2235-2988, (A 40 pkt)|
|Publication size in sheets||0.7|
|Keywords in English||Salmonella; host specificity; type 1 fimbriae; FimH; adhesion; calreticulin; receptor|
|ASJC Classification||; ; ;|
|Internal identifier||63618; PX-5a3b87ead5de6c4778eac725|
|License||Journal (articles only); published final; ; after publication|
|Score||= 40.0, 14-07-2020, ArticleFromJournal|
|Publication indicators||= 2; = 2; : 2017 = 1.133; : 2017 = 3.52 (2) - 2017=4.855 (5)|
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