The major part of polar carotenoids of the aerobic bacteria Roseococcus thiosulfatophilus RB3 and Erythromicrobium ramosum E5 is not bound to the bacteriochlorophyll a-complexes of the photosynthetic apparatus
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- Yurkov, V., Gad'on, N. & Drews, G. Arch. Microbiol. (1993) 160: 372. doi:10.1007/BF00252223
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The obligate aerobic bacteria Roseococcus thiosulfatophilus RB3 and Erythromicrobium ramosum E5 contain numerous polar carotenoids. The major carotenoid of the strain RB3 was the C30 carotene-dioate (4,4′-diapocarotene-4,4′-dioate) and the respective diglycosyl ester which have never been isolated before from a bacteriochlorophyll containing bacterium. Strain E5 contains the very polar erythroxanthin sulphate. The major carotenoid bound to reaction center and light-harvesting complexes is bacteriorubixanthinal. Most of the carotenoids of both strains are not bound to the pigment-protein complexes of the photosynthetic apparatus but to the envelope fraction (cytoplasmic membrane and cell wall).
Key wordsAerobic photosynthetic bacteria Carotenoids Carotene-dioate diglucosyl ester Erythroxanthin sulphate