Spirilloxanthin unusual

Spirilloxanthin pathway (normal spirilloxanthin, unusual spirilloxanthin, spheroidene, and carotenal pathways). 

Normal spirilloxanthin Unusual spirilloxanthin Spirilloxanthin Unusual-Spirillo Rhodospirillaceae, Chromatiaceae, Ectothiorhodospiraceae Rhodospirillaceae, Chromatiaceae, Ectothiorhodospiraceae 4... 

Unusual-Spirillo Unusual-Spirillo Spirilloxanthin, carotenal G Spirilloxanthin G Spirilloxanthin G Spirilloxanthin G Spirilloxanthin Unusual-Spirillo... 

The Chromatiaceae have either the spirilloxanthin pathway (normal spirilloxanthin, unusual spirilloxanthin and carotenal pathways) or okenone of the okenone pathway except for one species, Tea. halophila, which has both pathways (Tables 1 and4). Even in the same genus, some species have the spirilloxanthin pathway and others have the okenone pathway. Therefore, the carotenogenesis pathways are not well related to the bacteria s classification in the Chromatiaceae. 

Agalidis, I., T. Mattioli, and F. Reiss-Husson. 1999. Spirilloxanthin is released by detergent from Rubrivivax gelatinosus reaction center as an aggregate with unusual properties. Photosynth. Res. 62 314-2. 

The Rhodospirillaceae and Chromatiaceae have the spirilloxanthin or the okenone pathway depending on the genus or species. All of the Ectothiorhodospiraceae have the spirilloxanthin pathway. The isorenieratene, the y-and -carotene, and the diapocarotene pathways are found specifically in the Chlorobiaceae, Chloroflexaceae, and Heliobacteriaceae, respectively. Aerobic photosynthetic bacteria mostly have the spirilloxanthin pathway, further most of these species have unusual carotenoids including non-photosynthetic carotenoids, such as carotenoid sulfates and carotenoic acids, which have no photosynthetic functions. 

Most of the aerobic photosynthetic bacteria so far desaibed have the spirilloxanthin pathway, further some also have unusual carotenoids as described below. 

When one enzyme of the normal spirilloxanthin pathway is lacking or is present with reduced activity, the composition will be expected to change. Some species have indeed been reported to have such unusual compositions (Tables 3-5). Lycopene is... 

This spheroidene pathway is a variant of the unusual spirilloxanthin pathway as a result of the different properties of the phytoene desaturases (CrtI). 

Only the spirilloxanthin pathway is found (Tables 1 and 5). Some species have the unusual spirilloxanthin pathway. Hlr. halochloris and Hlr. abdel-malekii contain in addition carotenoid glycosides and their esters as major components. 

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