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Molecular cloning of a gene coding for a Vibrio cholerae haemagglutinin.

Recombinant plasmids encoding a Vibrio cholerae haemagglutinin were isolated from the highly virulent V. cholerae strain C5 by cosmid cloning. Both Escherichia coli HB101 containing the recombinant plasmids and V. cholerae C5 were able to agglutinate a variety of erythrocytes from human and animal origin; this haemagglutination was not inhibited by D-mannose or L-fucose. Subcloning of the recombinant cosmid DNA revealed that a 1.3 kb DNA fragment was sufficient for haemagglutinin production in E. coli HB101. Under direction of this 1.3 kb Vibrio DNA fragment, two proteins were made in E. coli minicells, of 27 and 10 kDa. Haemagglutinin-encoding sequences were not detected in every V. cholerae strain.