Abstract
A new type of auxotrophic mutant of Salmonella typhimurium has been isolated that is defective in the synthesis of the 3-deoxy-D-mannooctulosonate (ketodeoxyoctonate) region of the lipopolysaccharide and requires D-arabinose-5-phosphate for growth. Genetic and biochemical evidence indicated that the mutant defect was due to an altered ketodeoxyoctonate-8-phosphate synthetase with an apparent K(m) for D-arabinose-5-phosphate 35-fold higher than that of the parental enzyme. As a result of this enzymatic lesion, the mutant strain was dependent on exogenous D-arabinose-5-phosphate both for growth and for synthesis of a complete lipopolysaccharide.
MeSH Terms
Arabinose/metabolism
Carbon Isotopes
Galactose/metabolism
Ligases/metabolism
Lipopolysaccharides/biosynthesis
Mutation
Pentosephosphates
Phosphates/metabolism
Phosphoenolpyruvate
Polysaccharides, Bacterial/biosynthesis
Salmonella typhimurium/enzymology,isolation & purification,metabolism
Sugar Acids/biosynthesis
Chemicals
Carbon Isotopes
Lipopolysaccharides
Pentosephosphates
Phosphates
Polysaccharides, Bacterial
Sugar Acids
2-keto-3-deoxyoctonate
Phosphoenolpyruvate
Arabinose
Ligases
Galactose
Authors & Affiliations
2 authors, click to expand affiliations / ORCID
Rick P D
Osborn M J
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23 references, click to expand
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