Abstract
By mutational analysis it was found that a 3.9-kb SmaI-XhoII DNA fragment of Xanthomonas campestris pv. campestris is involved in lipopolysaccharide (LPS) biosynthesis. LPS samples isolated from different mutants carrying mutations in the 3.9-kb SmaI-XhoII DNA fragment exhibited banding patterns in silver-stained sodium dodecyl sulfate-polyacrylamide gels markedly different from that of the wild-type LPS. Moreover, comparison of the monosaccharide composition obtained by high-performance anion-exchange chromatography with pulsed amperometric detection of LPS purified from wild-type Xanthomonas campestris pv. campestris B100 and from mutants with mutations in the 3.9-kb SmaI-XhoII DNA fragment revealed a lack of rhamnose moieties in the mutant LPS. Sequence analysis of this DNA fragment revealed four open reading frames (ORFs), designated ORF302, ORF183, ORF295, and ORF351. The deduced amino acid sequences of these ORFs showed a high degree of homology to the deduced amino acid sequences of the rfbC, rfbD, rfbA, and rfbB genes of Salmonella typhimurium LT2, which have been shown to encode a set of enzymes responsible for conversion of glucose 1-phosphate to dTDP-rhamnose.
MeSH Terms
Amino Acid Sequence
Chromatography, High Pressure Liquid
Chromatography, Ion Exchange
Cloning, Molecular
DNA Mutational Analysis
DNA, Bacterial/genetics,metabolism
Genes, Bacterial
Lipopolysaccharides/chemistry,metabolism
Molecular Sequence Data
Monosaccharides/isolation & purification
Nucleoside Diphosphate Sugars/biosynthesis
Open Reading Frames
Restriction Mapping
Salmonella typhimurium/enzymology,genetics
Sequence Homology, Amino Acid
Thymine Nucleotides/biosynthesis
Xanthomonas campestris/enzymology,genetics,metabolism
Chemicals
DNA, Bacterial
Lipopolysaccharides
Monosaccharides
Nucleoside Diphosphate Sugars
Thymine Nucleotides
thymidine diphosphate rhamnose
Authors & Affiliations
5 authors, click to expand affiliations / ORCID
Köplin R
Lehrstuhl für Genetik, Universität Bielefeld, Germany.
Wang G
Hötte B
Priefer U B
Pühler A
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