Pathway isorenieratene

The Chlorobiaceae have the isorenieratene pathway only and can be divided the isorenieratene and the chlorobactene pathways (Tables 1 and 6). The species which mainly contain isorenieratene always have BChl c or 4 as major component, and those which chlorobactene always have BChl e (Imhoff, 1995). Chi. tepidum contains additional carotenoid glucoside esters. Mostly the carotenes are located in chloro-somes, accompanied by BChl c, while carotenoid glucoside esters are mainly located in the membranes... 

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. 

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