Expression of the puf Operon in an Aerobic Photosynthetic Bacterium, Roseobacter denitrificans
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概要
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The effects of oxygen and light on the expression of the puf operon were investigated in Roseobacter denitrificans in a comparison with those in Rhodobacter sphaeroides. In darkness, the levels of the total puf mRNA in Ros. denitrificans were about 1.3 times those in Rb. sphae-roides at low concentrations of oxygen, reflecting the ac-cumulation of bacteriochlorophyll and carotenoids. The oxygen tension, up to 94% Saturation of dissolved oxygen, did not affect the levels of the total puf transcripts in Ros. denitrificans, whereas those in Rb. sphaeroides were reduced to 55% of the maximum level even at 50% saturation. Four puf-specific transcripts were detected: a 0.5-kb transcript was the most abundant; 1.2-kb and 1.9-kb transcripts accumulated at low levels; and a 3.5-kb transcript accumulated at very low levels under all conditions tested. The levels of the individual transcripts were barely affected by molecular oxygen. An S-1 nuclease protection assay revealed that the 0.5-kb transcript encoded the LHI-a and LHI-β subunits (pufBA), the 1.2-kb transcript encoded pufBA and part of pufL, and the 1.9-kb transcript encoded pufBAL and part of pufM. It was not clear whether the 3.5-kb transcript encoded the entire pufBALM and the gene for the polypeptide moiety of cytochrome c. The difference in levels between the 0.5-kb transcript and the other transcripts (1.2 kb, 1.9 kb, and 3.5 kb) was presumed to be due to the presence of several stem-loop structures at the 3' terminus of the 0.5-kb transcript which acted as terminators of transcription and, possibly, as protection against nucleolytic digestion. Light inhibited the expression of the puf operon in Ros. denitrificans more effectively than that in Rb. sphaeroides. The insensitivity to oxygen, as well as the sensitivity to light, of the expression of the puf operon in Ros. denitrificans, which was different from that in Rb. sphaeroides, seemed to represent a mode of adaptation that allowed the former cells to avoid photodynamic damage by light under highly aerobic conditions.
- 日本植物生理学会の論文
著者
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SHIMADA Hiroshi
Department of Cardiology, Yokohama-Minami Kyosai Hospital
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Shimada Hiroshi
Third Department Of Internal Medicine
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SHIRANO Yumiko
Mitsui Plant Biotechnology Research Institute
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Shioi Y
Mitsui Plant Biotechnology Research Institute
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Shioi Yuzo
Department Of Biological Sciences Faculty Of Bioscience And Biotechnology Tokyo Institute Of Technol
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Ohta Hiroyuki
Dept. Biol. Sci. Tokyo Inst. Technol.
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OHTA HIROYUKI
Department of Bioresource Science, College of Agriculture, Ibaraki University
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Nishimura Kohji
Department of Biological Sciences, Faculty of Bioscience and Biotechnology, Tokyo Institute of Techn
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Masuda Tatsuru
Department of Biological Sciences, Faculty of Bioscience and Biotechnology, Tokyo Institute of Techn
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Takamiya Ken-ichiro
Department of Biological Sciences, Faculty of Bioscience and Biotechnology, Tokyo Institute of Techn
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Nishimura Kohji
Dept. Biol. Sci. Tokyo Inst. Technol.
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Shimada Hiroshi
Department Of Biological Sciences Graduate School Of Bioscience And Biotechnology Tokyo Institute Of
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Takamiya Ken-ichiro
Department Of Biological Sciences Faculty Of Bioscience And Biotechnology Tokyo Institute Of Technol
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Masuda Tatsuru
Department Of Biological Sciences Graduate School Of Bioscience And Biotechnology Tokyo Institute Of
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Ohta Hiroyuki
Department Of Biological Sciences Graduate School Of Bioscience And Biotechnology Tokyo Institute Of
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Sekido Hitoshi
Department Of Gastroenterological Surgery Yokohama City University Graduate School Of Medicine
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Shimada Hiroshi
Department Of Biological Sciences Tokyo Institute Of Technology
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Shimada H
Department Of Gastroenterological Surgery Yokohama City University Postgraduate School Of Medicine
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Takamiya Ken-ichiro
Department Of Biological Sciences Faculty Of Bioscience And Biotechnology
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Shioi Yuzo
Department Of Biological Science Faculty Of Science Shizuoka University
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Shimada Hiroshi
Department of Applied Physics and Chemistry, The University of Electro-Communications, Chofu, Tokyo 182-8585, Japan
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