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. 1973 Oct;136(2):361–369. doi: 10.1042/bj1360361

The formation of choline O-sulphate by Pseudomonas C12B and other Pseudomonas species

John W Fitzgerald 1
PMCID: PMC1165962  PMID: 4590202

Abstract

Pseudomonas C12B and other Pseudomonas species released larger amounts of a 35S-labelled metabolite into the medium when cultured on growth-limiting concentrations of Na2SO4 as opposed to growth in SO42−-sufficient media. The metabolite was found at all stages of the culture cycle of Pseudomonas C12B and maximum quantities occurred in stationary-phase culture supernatants. The metabolite was not detected when the bacterium was cultured on growth-limiting concentrations of potassium phosphate. The amount of the metabolite present in the medium greatly exceeded that which could be extracted from intact cells and, except for choline chloride, it was independent of the carbon source used for growth. If choline chloride was present in high concentration, then larger amounts of the metabolite were found in the culture medium. The metabolite was not detected extracellularly or intracellularly when the bacterium was grown in SO42−-deficient media containing 5mm-l-cysteine. The same metabolite was also synthesized in vitro only when Pseudomonas C12B extracts were incubated with choline chloride, ATP, MgCl2 and Na235SO4. The metabolite-forming system was not subject to repression by Na2SO4 and was completely inhibited by 0.5mm-l-cysteine and activated by Na2SO4 (up to 1.0mm). The metabolite was identified as choline O-sulphate by electrophoresis, chromatography and isotope-dilution analysis. Another 35S-labelled metabolite was also detected in culture supernatants, but was not identified.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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