Method of isolating restriction fragment deletions in vibrio cholerae and products thereof

摘要

This invention relates to a method of isolating deletion mutants of Vibrio cholerae, wherein the deletion is predetermined by digestion with restriction endonucleases of known specificity. The deletions are inserted into the Vibrio cholerae chromosome by in vivo recombination betweem a plasmid carrying the desired deletion, with adjacent flanking sequences, and the Vibrio cholerae chromosome. The invention includes the isolation and characterization of a new Vibrio cholerae strain having a deletion in the tox gene, as defined by Acc I restriction endonuclease sites.