Molecular cloning, characterization, and nucleotide sequence of the rfc gene, which encodes an O-antigen polymerase of Salmonella typhimurium.
AUTOR(ES)
Collins, L V
RESUMO
The rfc gene of Salmonella typhimurium was located in a 1.75-kb HindIII fragment and restored wild-type lipopolysaccharide synthesis ability to both an older rfc point mutant and new rfc::IS10 mutants. DNA sequencing of the HindIII fragment revealed an open reading frame which could encode a protein of 407 amino acids with an Mr of 47,472 and also revealed potential translation signals. Modulator codons accounted for 12.5% of the total codon content, providing a possible explanation for the nondetectability of the protein in subcellular systems. Secondary structure analysis suggested the presence of transmembrane beta-sheet structures, implying a possible role for the protein in translocation of hydrophilic O-antigen-containing materials. Salmonella strains of groups A, B, and D1 contained rfc-homologous DNA, but strains of groups C1, C2, C3, D2, and E2 did not.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=207816Documentos Relacionados
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