Alternative pathways of spirilloxanthin biosynthesis in Rhodospirillum rubrum.
نویسنده
چکیده
Detailed studies of the properties of carotenoids isolated from diphenylamine-inhibited cultures of Rhodospirillum rubrum have revealed a number of novel structures that indicate new features of carotenoid biosynthesis in the photosynthetic bacteria. Both neurosporene and 7,8,11,12-tetrahydrolycopene undergo hydration, methylation and dehydrogenation to yield spheroidene and 11',12'-dihydrospheroidene respectively; all the intermediates in these pathways have been identified. These pathways represent alternative routes of anhydrorhodovibrin and spirilloxanthin biosynthesis.
منابع مشابه
Polarization angle dependence of stark absorption spectra of spirilloxanthin bound to the reconstituted LH1 complexes using LH1-subunits isolated from the purple photosynthetic bacterium Rhodospirillum rubrum.
Reconstituted LH1 complexes were prepared using the LH1 subunit-type complexes, isolated from the purple photosynthetic bacterium Rhodospirillum (Rs.) rubrum, and purified all-trans spirilloxanthin. Stark absorption spectra of spirilloxanthin bound to both the native and reconstituted LH1 complexes were compared in different polarization angles (χ) against the external electric field. From the ...
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4. BENEDICT, C. R. AND L. D. BECKMAN. 1964. Biosynthesis of the methoxylated carotenoids in Rhodospirillumn rubrum. Plant Physiol. 39: 726-30. 5. BRAITHWAITE, G. D. AND T. W. GOODWIN. 1958. Origin of the methoxyl groups in spirilloxanthin. Nature (London) 182: 1304-05. 6. COHEN-BAZIRE, G., XV. R. SISTROM, AND R. Y. STANIER. 1957. Studies on the pigment synthesis by nonsulfur purple bacteria. J....
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Isolated photosynthetic reaction center from the bacterium Rhodospirillum rubrum was extracted with acetone-methanol. Its main pigments were identified as bacteriochlorophyll, bacteriopheophytin, and spirilloxanthin. The extinction coefficients of these pigments in acetone-methanol were determined. Quantitative spectroscopic analysis of the dry acetone-methanol extracts indicated a bacteriochlo...
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The biosynthesis of the major carotenoid spirilloxanthin by the purple nonsulfur bacterium Rhodospirillum rubrum is thought to occur via a linear pathway proceeding through phytoene and, later, lycopene as intermediates. This assumption is based solely on early chemical evidence (B. H. Davies, Biochem. J. 116:93-99, 1970). In most purple bacteria, the desaturation of phytoene, catalyzed by the ...
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عنوان ژورنال:
- The Biochemical journal
دوره 116 1 شماره
صفحات -
تاریخ انتشار 1970