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  • Biosynthesis  (3)
  • 1975-1979  (3)
  • 1
    Electronic Resource
    Electronic Resource
    The carotenoids of Flavobacterium strain R1560 (1977)
    Springer
    Archives of microbiology 113 (1977), S. 33-37 
    Details
    ISSN: 1432-072X
    Keywords: Flavobacterium R1560 ; Carotenoids ; Zeaxanthin ; cts-Phytoene ; Carotenes ; Biosynthesis ; Nicotine ; Taxonomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The main carotenoid of Flavobacterium strain R1560 has been identified as (3R,3′R)-zeaxanthin. Also present were small amounts of 15-cis-phytoene, phytofluene, “ζ-carotene” (7,8,7′,8′-tetrahydro-ψ, ψ-carotene plus 7,8,11,12-tetrahydro-ψ, ψ-carotene), neurosporene, lycopene, β-zeacarotene, γ-carotene, β-carotene, β-cryptoxanthin, rubixanthin, 3-hydroxy-β-zeacarotene and several apo-carotenals. Zeaxanthin production was inhibited by nicotine (10 mM), and lycopene and rubixanthin accumulated. The biosynthesis of zeaxanthin is discussed in terms of pathways and also of “half-molecule” reaction sequences. The presence of zeaxanthin may be a characteristic of a group of Flavobacterium species, and may thus be useful in the taxonomic classification of these organisms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00428576
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  • 2
    Electronic Resource
    Electronic Resource
    A series of mutant strains of Scenedesmus obliquus with abnormal carotenoid compositions (1977)
    Springer
    Archives of microbiology 113 (1977), S. 275-280 
    Details
    ISSN: 1432-072X
    Keywords: Scenedesmus obliquus ; Green alga ; Chlorophyta ; Mutants ; Carotenoid ; Phytoene ; ζ-Carotene ; Biosynthesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Several mutant strains of Scenedesmus obliquus (Chlorophyta) have been isolated which, when cultured heterotrophically, are pale green or yellow, in contrast to the dark green of the wild type. On the basis of their carotenoid compositions, four groups of pale-green strains have been delineated. These accumulate, respectively, no carotenoid, phytoene, mainly ζ-carotene and mainly ζ-carotene together with some neurosporene and lycopene. All these strains synthesized no chlorophyll b and only small amounts of chlorophyll a. A further group of yellow strains produced the normal Scenedesmus obliquus range of cyclic carotenes and xanthophylls, but no chlorophyll. Most of the pale-green strains were killed by exposure to light, but two strains, PG1 and 1E, which accumulated predominantly ζ-carotene when grown in the dark, survived exposure to the light and developed photosynthetically active chloroplasts containing the normal pigments. The possible biosynthetic implications of the carotenoid composition of these mutant strains, and the relationship between the carotenoid composition and protection of the cells from photooxidative destruction are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00492035
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  • 3
    Electronic Resource
    Electronic Resource
    The roles of isomers of phytoene, phytofluene and ζ-carotene in carotenoid biosynthesis by a mutant strain of Scenedesmus obliquus (1977)
    Springer
    Archives of microbiology 115 (1977), S. 175-179 
    Details
    ISSN: 1432-072X
    Keywords: Scenedesmus obliquus ; Chlorophyta ; Pigment mutant PG1 ; Phytoene ; Phytofluene ; ζ-Carotene ; Cis-isomer ; Biosynthesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Considerable changes in pigment composition accur during a period of 10 h when dark-grown cultures of PG1, a ζ-carotenic strain of Scenedesmus obliquus, are illuminated. These changes are consistent with a biosynthetic pathway in which 15-cis-phytoene is converted via 15-cis-phytofluene and 15-cis-ζ-carotene into all-trans-gz-carotene and trans-bicyclic carotenoids. The findings also support the view that the xanthophylls lutein and zeaxanthin are formed from the corresponding carotenes and are especially important in the development of a normal chloroplast structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00406372
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