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J. Bacteriol., 03 1995, 1383-1387, Vol 177, No. 5
Copyright © 1995, American Society for Microbiology

MudSacI, a transposon with strong selectable and counterselectable markers: use for rapid mapping of chromosomal mutations in Salmonella typhimurium

M Lawes and S Maloy
Department of Microbiology, University of Illinois, Urbana 61801.

The transposable bacteriophage Mu and its mini-Mu derivatives are useful tools for the genetic analysis of many bacteria. A variety of antibiotic-resistant Mu derivatives have been constructed, allowing direct selection for cells which contain the transposon. However, in many cases a counterselection against the transposon would greatly facilitate further genetic analysis. In this paper we report the construction of MudSacI, a mini-Mu derived transposon containing the sacB (secretory levansucrase) gene of Bacillus subtilis, which confers sucrose sensitivity upon gram-negative bacteria. We describe the use of this transposon as a tool for rapid genetic mapping of chromosomal genes in Salmonella typhimurium. Simple modifications of this approach should facilitate rapid mapping in many other bacteria as well.

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