Journal Article

Myxoxanthophyll in <i>Synechocystis</i> sp. PCC 6803 is Myxol 2′-Dimethyl-Fucoside, (3<i>R</i>,2′<i>S</i>)-Myxol 2′-(2,4-di-<i>O</i>-Methyl-α-<span class="smallCaps">l</span>-Fucoside), not Rhamnoside

Shinichi Takaichi, Takashi Maoka and Kazumori Masamoto

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 42, issue 7, pages 756-762
Published in print July 2001 | ISSN: 0032-0781
Published online July 2001 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pce098
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

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We identified the molecular structures of the carotenoids in Synechocystis sp. PCC 6803. Myxoxanthophyll in this cyanobacterium was myxol 2′-dimethyl-fucoside, (3R,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, (3R,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.

Keywords: Key words: Carotenoid — α-l-Fucose — Myxol — Myxol dimethyl-fucoside — Myxoxanthophyll — Synechocystis sp. PCC 6803.; Abbreviations: CD, circular dichroism; NMR, nuclear magnetic resonance.

Journal Article.  4150 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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