Glycosylated F4 (K88) fimbrial adhesin FaeG expressed in barley endosperm induces ETEC-neutralizing antibodies in mice

Jussi Joensuu, Mirkka Kotiaho, Teemu Teeri, Leena Valmu, Anna Maria Nuutila, Kirsi-Marja Oksman-Caldentey, Viola Niklander-Teeri

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

Sammanfattning

The F4-positive enterotoxigenic Escherichia coli (ETEC) strains are a frequent cause of porcine post-weaning diarrhea. Orally administered F4 fimbriae or FaeG, the major subunit and adhesin of F4, induce a protective mucosal immune response in F4 receptor-positive piglets. Feed plants carrying immunogenic subunit proteins can offer great advantages for oral vaccination of domestic animals. Here, we describe high-level endosperm-specific production (1% of total soluble proteins) of FaeG in the crop plant barley. The endoplasmic reticulum-targeted recombinant endospermic FaeG (erFaeG) was shown to be heterogeneously glycosylated. The erFaeG showed resistance at digestive conditions simulating piglet gastric fluid. Glycosylation did not abolish the immunogenic character of the FaeG protein, since erFaeG was able to induce F4 fimbria-specific antibodies in mice. Biological activity of these anti-F4 antibodies was demonstrated in vitro by blocking the attachment of the F4(+) ETEC to the F4 receptors present on porcine intestinal enterocytes.
Originalspråkengelska
TidskriftTransgenic Research
Volym15
Nummer3
Sidor (från-till)359-373
Antal sidor15
ISSN0962-8819
DOI
StatusPublicerad - 2006
MoE-publikationstypA1 Tidskriftsartikel-refererad

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  • 414 Jordbruksbioteknologi
  • 411 Jordbruks- och skogsvetenskaper

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