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Chromosomal DNA was extracted from toxigenic Clostridium butyricum strain BL6340 isolated from a case of infant botulism. After digestion by EcoRI, a DNA fragment of about 1 kbp was cloned into Escherichia coli using lambda gt11, and was subcloned into pUC118. The E. coli cells transformed with this cloned fragment produced a 33 kDa protein which reacted with monoclonal antibodies recognizing the light chain (Lc) component of botulinum type E toxin. The nucleotide sequence of the cloned fragment was determined. The sequence was similar to that from botulinum type E toxin gene fragments previously determined by our laboratory (strains Mashike, Otaru and Iwanai). Several highly homologous sequences among the botulinum type A, C, E, butyricum and tetanus toxin genes were found in both translated and untranslated regions. These results suggest that the toxin gene of C. butyricum may have evolved by transfer from C. botulinum.

Cloning of a DNA fragment encoding the 5'-terminus of the botulinum type E toxin gene from Clostridium butyricum strain BL6340