Oxygen- and carbon monoxide-binding affinity of the liposomal heme under semiphysiological conditions.
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概要
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Oxygen- and carbon monoxide-binding affinity (<I>P</I><SUB>1⁄2</SUB>) of the [α,α,α,α-<I>meso</I>-tetrakis(<I>o</I>-pivalamidophenyl)porphinato]iron(II)-mono(1-dodecyl-2-methylimidazole) complex incorporated in liposome of phosphatidylcholine (abbreviated as liposomal heme) were measured in pH 7.0 aqueous solution at 15–37 °C. The <I>P</I><SUB>1⁄2</SUB>(O<SUB>2</SUB>) and <I>P</I><SUB>1⁄2</SUB>(CO) values at 37 °C were 49 and 0.02 mmHg, respectively. Enthalpy and entropy changes for the reversible bindings were similar to those of hemoglobin. The relationship between temperature and <I>P</I><SUB>1⁄2</SUB> for the dimyristoylphosphatidylcholine-liposomal heme had a breaking point at <I>ca</I>. 24 °C, which agreed with the phase transition temperature of the liposomal heme.
- 公益社団法人 日本化学会の論文
著者
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Nishide Hiroyuki
Department Of Applied Chemistry Waseda University
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Tsuchida Eishun
Department Of Applied Chemistry Waseda University
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YUASA MAKOTO
Department of Polymer Chemistry, Waseda University
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YUASA Makoto
Department of Industrial Chemistry, Faculty of Science and Technology, Science University of Tokyo
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Sekine Mikiya
Department of Polymer Chemistry, Waseda University
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