Light-induced changes of carotenoid pigments in anaerobic cells of the aerobic photosynthetic bacterium,Roseobacter denitrificans (Erythrobacter species OCh 114): reduction of spheroidenone to 3,4-dihydrospheroidenone |
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Authors: | Shinichi Takaichi Kazuo Furihata Keiji Harashima |
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Institution: | (1) Biological Laboratory, Nippon Medical School, Kosugi-cho 2, 211 Nakahara-ku, Kawasaki, Japan;(2) Institute of Applied Microbiology, The University of Tokyo, Yayoi-cho 1, 113 Bunkyo-ku, Tokyo, Japan;(3) Yachiyo International University, Gakuen-cho, 276 Yachiyo, Chiba, Japan |
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Abstract: | Roseobacter denitrificans, previously named Erythrobacter species OCh 114, synthesized spheroidenone as a major carotenoid under aerobic dark conditions. When the dark-grown cells
were subjected to illumination under anacrobic conditions, many unknown yellow pigments appeared and a considerable amount
of spheroidenone disappeared. Absorption maxima of these pigments were blue-shifted from those of spheroidenone. The most
abundant of the pigments was isolated, and its chemical structure was determined as 3,4-dihydrospheroidenone on spectroscopic
and chemical evidence. Presumably, over-reduction of the photosynthetic apparatus interfered with normal photosynthetic electron
transfer and resulted in photoreduction of C=C double bond at the 3,4-position of spheroidenone. |
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Keywords: | Roseobacter denitrificans Erythrobacter species OCh 114 3 4-Dihydrospheroidenone Spheroidenone Carotenoid Photoreduction Proton nuclear magnetic resonance (1H-NMR) |
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