locus on the chromosome of Escherichia coli. This locus contains genes whose products are
involved in the assembly of the core region of the lipopolysaccharide molecule. In the R1
core prototype strain, E. coli F470, there are nine genes in this operon, and all butwaaY,
waaQ, and waaP have been assigned function. In this study, the waaY, waaQ, and waaP
genes were independently mutated by insertion of a non-polar antibiotic resistance cassette …