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• W2149741978 endingPage "2385" @default.
• W2149741978 startingPage "2379" @default.
• W2149741978 abstract "We report the analysis of three open reading frames of Salmonella typhimurium LT2 which we identified as rfaF, the structural gene for ADP-heptose:LPS heptosyltransferase II; rfaD, the structural gene for ADP-L-glycero-D-manno-heptose-6-epimerase; and part of kbl, the structural gene for 2-amino-3-ketobutyrate CoA ligase. A plasmid carrying rfaF complements an rfaF mutant of S. typhimurium; rfaD and kbl are homologous to and in the same location as the equivalent genes in Escherichia coli K-12. The RfaF (heptosyl transferase II) protein shares regions of amino acid homology with RfaC (heptosyltransferase I), RfaQ (postulated to be heptosyltransferase III), and KdtA (ketodeoxyoctonate transferase), suggesting that these regions function in heptose binding. E. coli contains a block of DNA of about 1,200 bp between kbl and rfaD which is missing from S. typhimurium. This DNA includes yibB, which is an open reading frame of unknown function, and two promoters upstream of rfaD (P3, a heat-shock promoter, and P2). Both S. typhimurium and E. coli rfaD genes share a normal consensus promoter (P1). We postulate that the yibB segment is an insertion into the line leading to E. coli from the common ancestor of the two genera, though it could be a deletion from the line leading to S. typhimurium. The G+C content of the rfaLKZYJI genes of both S. typhimurium LT2 and E. coli K-12 is about 35%, much lower than the average of enteric bacteria; if this low G+C content is due to lateral transfer from a source of low G+C content, it must have occurred prior to evolutionary divergence of the two genera." @default.
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• W2149741978 date "1994-04-01" @default.
• W2149741978 modified "2023-09-23" @default.
• W2149741978 title "Molecular analysis of the rfaD gene, for heptose synthesis, and the rfaF gene, for heptose transfer, in lipopolysaccharide synthesis in Salmonella typhimurium" @default.
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• W2149741978 doi "https://doi.org/10.1128/jb.176.8.2379-2385.1994" @default.
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