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Expression of the pilin gene from Bacteroides nodosus in Escherichia coli

Bacterial plasmids that direct the expression in Escherichia coli of the pilin of Bacteroides nodosus were constructed. The quantity of pilin produced was greater than that of the pilin synthesized by B. nodosus, but no surface structural pili were present; pilin was found associated with the inner membrane of E. coli. Vaccination of sheep with E. coli containing pilin elicited increases in agglutinating and enzyme-linked immunosorbent assay antibody titers, which in turn were lower than the titers in sheep immunized with pilin from B. nodosus. The E. coli-produced pilin vaccine initially appeared to delay the progression of infection in immunized sheep after a challenge with virulent homologous B. nodosus, but at a later time the severity of foot rot was similar to that in sheep vaccinated with a placebo.