Nitric Oxide-Reductase Homologue That Contains a Copper Atom and Has Cytochrome c-Oxidase Activity from an Aerobic Phototrophic Bacterium Roseobacter denitrificans.
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概要
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A cytochrome cb-type enzyme with cytochrome c-oxidase activity was purified from an aerobic phototrophic bacterium Roseobacter denitrificans. The enzyme was solubilized with sucrose monodecanoate from the membranes of R. denitrificans grown aerobically under light conditions, and purified to electrophoretic homogeneity. Absorption spectra of the purified enzyme showed peaks at 410nm and 530nm in the oxidized state, and peaks at 420, 522, and 551nm and a shoulder at around 560nm in the reduced state. The enzyme is composed of two subunits with apparent molecular weights on SDS-PAGE of 37, 000 and 18, 000, the latter positive to heme staining. The protein contains heme c, heme b, and copper in a 1:2:1 stoichiometry. The spectral properties indicated that the heme c and one heme b are in low-spin states, while the other heme b is in a high-spin state. The base sequences of the genes and the deduced amino acid sequences are similar to those of known NorB and NorC subunits of nitric oxide reductases from other bacterial species. The enzyme is similar to nitric oxide reductase, but differs in that it contains copper. Virtually no nitric oxide reductase activity was detected in the purified enzyme.
- 社団法人 日本生化学会の論文
著者
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Iba Koh
Department Of Biology Faculty Of Science Kyushu University
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Osaki Tsukasa
Department Of Molecular Bilology Graduate School Of Medical Science Kyusyu University
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Kawabata Shun-ichiro
Department Of Bilolgy Faculty Of Science Kyushu University
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WATANABE Azusa
Department of Biology, Graduate School of Sciences, Kyushu University
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ARATA Hiroyuki
Department of Biology, Graduate School of Sciences, Kyushu University
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Eguchi Akane
Department Of Biology Graduate School Of Sciences Kyushu University
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Inamori Kei-ichiro
Department Of Molecular Bilology Graduate School Of Medical Science Kyusyu University
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Watanabe Azusa
Department Of Biology Graduate School Of Sciences Kyushu University
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Matsuda Yuji
Department Of Applied Molecular Bioscience Graduate School Of Bioagricultural Sciences Nagoya University
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