Abstract
The K88 antigen, a plasmid-specified virulence factor of E. coli involved in porcine neonatal diarrhoea, is often found to be associated with the ability to metabolize raffinose (Raf). Plasmid pRI8801 (51 megadalton) was used to clone the determinants of K88 and Raf with the vector pBR322. K88 was found to be encoded by a 7.7 megadalton HindIII fragment. The expression was highly dependent on the orientation of the HindIII fragment within pBR322. By in vitro generation of deletions, the HindIII fragment was reduced in size to 4.3 megadalton. The expression of K88 by pRI8801 and the recombinant plasmids was studied using an enzyme-linked immunosorbent assay. Raf was found to be located on a 4.0 megadalton SalI fragment. A physical map of pRI8801 was constructed. The K88 antigen and Raf genes are not closely linked but separated by a stretch of DNA of about 20 megadalton.
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