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Loci termed rfa, determining biosynthesis of somatic lipopolysaccharide core, have been mapped in Salmonella typhimurium LT2. The smooth-specific phage P22 co-transduced two leaky rfa alleles with cysE and with pyrE; one of the leaky alleles is perhaps rfaG, and the other is an unidentified gene concerned with synthesis of the heptose-containing part of the core. The lipopolysaccharide-indifferent phage ES18 (or its variant ES18.h1) co-transduced rfaF, rfaG, rfaL, rfa(R-res-1), and rfa(R-res-2) alleles with cysE and with pyrE, at rates indicating the order cysE-rfaF-(rfa[R-res-1], rfa[r-res-2], rfaL)-rfaG-pyrE. One proven (and two suspected) rfaE alleles and five proven rfaH alleles were not co-transduced with cysE or pyrE. Hfr crosses indicated that the proven rfaE allele mapped between serA and strA.

Mapping of rfa Genes in Salmonella typhimurium by ES18 and P22 Transduction and by Conjugation