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- W2137999917 abstract "A plasmid that included both an 8.9 kb chromosomal DNA insert containing genes from the rfb cluster of Shigella dysenteriae 1 and a smaller insert containing the rfp gene from a S. dysenteriae 1 multicopy plasmid resulted in efficient expression of O antigen in an rfb-deleted strain of Escherichia coli K-12. Eight genes were identified in the rfb fragment: the rfbB-CAD cluster which encodes dTDP-rhamnose synthesis, rfbX which encodes a hydrophobic protein involved in assembly of the O antigen, rfc which encodes the O antigen polymerase, and two sugar transferase genes. The production of an O antigen also required the E. coli K-12 rfe gene, which is known to encode a transferase which adds N-acetylglucosamine phosphate to the carrier lipid undecaprenol phosphate. Thus Rfe protein appears to function as an analogue of the Salmonella RfbP protein to provide the first sugar of the O unit. Functional analysis of the other genes was facilitated by the fact that partial O units of one, two or three sugars were efficiently transferred to the lipopolysaccharide core. This analysis indicated that the plasmid-encoded Rfp protein is the transferase that adds the second sugar of the O unit while the two rfb transferases add the distal sugars to make an O antigen whose structure is (Rha-Rha-Gal-GlcNAc)n. The use of the rfe gene product as the transferase that adds the first sugar of an O unit is a novel mechanism which may be used for the synthesis of other enteric O antigens." @default.
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- W2137999917 date "1993-07-01" @default.
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- W2137999917 title "Function of the rfb gene cluster and the rfe gene in the synthesis of O antigen by Shigella dysenteriae 1" @default.
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- W2137999917 doi "https://doi.org/10.1111/j.1365-2958.1993.tb01700.x" @default.
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