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Carotenoid biosynthesis in Rhodopseudomonas spheroides. S-adenosylmethionine as the methylating agent in the biosynthesis of spheroidene and spheroidenone.

Abstract
[methyl-(14)C]Methionine and S-adenosyl[methyl-(14)C]methionine were incorporated into the methoxycarotenoids spheroidene and spheroidenone by Rhodopseudomonas spheroides. The incorporation was greatly enhanced in the presence of lysozyme. On degradation of labelled spheroidene by hydriodic acid, the (14)C label was recovered in methyl iodide. Degradation of spheroidenone by reduction and allylic dehydration and demethylation of the reduction product gave a mixture of unlabelled carotenoid hydrocarbons, including 3,4-didehydrolycopene and 3,4-didehydro-7',8'-dihydrolycopene. The label from [methyl-(14)C]methionine and S-adenosyl[methyl-(14)C]methionine was located specifically in the methoxy group of spheroidene and spheroidenone. The biosynthesis of methoxycarotenoids in Rps. spheroides involves methylation of the tertiary hydroxyl groups of intermediates with S-adenosylmethionine.
AuthorsR K Singh, G Britton, T W Goodwin
JournalThe Biochemical journal (Biochem J) Vol. 136 Issue 2 Pg. 413-9 (Oct 1973) ISSN: 0264-6021 [Print] England
PMID4544066 (Publication Type: Journal Article)
Chemical References
  • Carbon Radioisotopes
  • Carotenoids
  • S-Adenosylmethionine
  • Methionine
  • Muramidase
Topics
  • Carbon Radioisotopes
  • Carotenoids (biosynthesis, isolation & purification)
  • Chromatography, Thin Layer
  • Methionine (metabolism)
  • Muramidase (pharmacology)
  • Rhodobacter sphaeroides (metabolism)
  • S-Adenosylmethionine (metabolism)

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