Myxoxanthophyll in Synechocystis sp. PCC 6803 is Myxol 2′-Dimethyl-Fucoside, (3R,2′S)-Myxol 2′-(2,4-di-O-Methyl-α-l-Fucoside), not Rhamnoside (original) (raw)

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1_Biological Laboratory, Nippon Medical School, Kawasaki, 211-0063 Japan_

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2_Kyoto Pharmaceutical University, Kyoto, 607-8414 Japan_

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3_Biological Laboratory, Faculty of Education, Kumamoto University, Kumamoto, 860-8555 Japan_

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Shinichi Takaichi, Takashi Maoka, Kazumori Masamoto, Myxoxanthophyll in Synechocystis sp. PCC 6803 is Myxol 2′-Dimethyl-Fucoside, (3_R_,2′S)-Myxol 2′-(2,4-di-_O_-Methyl-α-l-Fucoside), not Rhamnoside, Plant and Cell Physiology, Volume 42, Issue 7, 15 July 2001, Pages 756–762, https://doi.org/10.1093/pcp/pce098
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Abstract

We identified the molecular structures of the carotenoids in Synechocystis sp. PCC 6803. Myxoxanthophyll in this cyanobacterium was myxol 2′-dimethyl-fucoside, (3_R_,2′S)-myxol 2′-(2,4-di-O_-methyl-α-l-fucoside). The sugar moiety of the pigment was not rhamnose but dimethylated fucose, which has not been reported in carotenoid glycosides. The other carotenoids were β-carotene, (3_R,3′R)-zeaxanthin, echinenone, (3′R)-3′-hydroxyechinenone and deoxymyxol 2′-dimethyl-fucoside, (2′S)-deoxymyxol 2′-(2,4-di-_O_-methyl-α-l-fucoside). Generally, the group of polar carotenoids in cyanobacteria is referred to as myxoxanthophyll, and the structure is considered to be myxol 2′-rhamnoside. Since the name myxoxanthophyll can not specify the sugar moiety and the identification of the sugar moiety is unfeasible in many cyanobacteria, we propose the following naming convention: when the sugar moiety is unknown, the name is myxol glycoside, when known, as in the case of rhamnose and α-l-fucose, they should be named myxol 2′-rhamnoside and myxol 2′-α-l-fucoside, respectively.

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Myxoxanthophyll in Synechocystis sp. PCC 6803 is Myxol 2′-Dimethyl-Fucoside, (3_R_,2′S)-Myxol 2′-(2,4-di-_O_-Methyl-α-l-Fucoside), not Rhamnoside - 24 Hours access

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