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The secondary electron acceptor of photosystem I in Gloeobacter violaceus PCC 7421 is menaquinone-4 that is synthesized by a unique but unknown pathway |
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| Authors: | Mimuro Mamoru Tsuchiya Tohru Inoue Hidetoshi Sakuragi Yumiko Itoh Yuka Gotoh Takanori Miyashita Hideaki Bryant Donald A Kobayashi Masami |
| Institution: | Department of Technology and Ecology, Hall of Global Environmental Research, Kyoto University, Kyoto 606-8501, Japan. mamo-mi@mm1.mbox.media.kyoto-u.ac.jp |
| Abstract: | The secondary electron acceptor of photosystem (PS) I in the cyanobacterium Gloeobacter violaceus PCC 7421 was identified as menaquinone-4 (MQ-4) by comparing high performance liquid chromatograms and absorption spectra with an authentic compound. The MQ-4 content was estimated to be two molecules per one molecule of chlorophyll (Chl) a', a constituent of P700. Comparative genomic analyses showed that six of eight men genes, encoding phylloquinone/MQ biosynthetic enzymes, are missing from the G. violaceus genome. Since G. violaceus clearly synthesizes MQ-4, the combined results indicate that this cyanobacterium must have a novel pathway for the synthesis of 1,4-dihydroxy-2-naphthoic acid. |
| Keywords: | Chl chlorophyll DHNA 1 4-dihydroxy-2-naphthoic acid HPLC high performance liquid chromatography MQ menaquinone P700 the primary electron donor of photosystem I PhQ phylloquinone PQ plastoquinone PS photosystem |
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