Cosmid cloning and transposon mutagenesis in Salmonella typhimurium using phage λ vehicles

Abstract
We have constructed a strain of Salmonella typhimurium which contains the malB region from Escherichia coli and carries the bacteriophage λ receptor protein in its outer membrane. Phage λ adsorbs to this strain but cannot grow, thus providing a very useful system for transposon mutagenesis of S. typhimurium using λ vehicles carrying transposons. This system can also be used for cosmid cloning.