Efficient production and characterization of Bacillus anthracis lethal factor and a novel inactive mutant rLFm-Y236F |
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Authors: | Cao Sha Liu Ziduo Guo Aizhen Li Yan Zhang Chengxian Gaobing Wu Chunfang Feng Tan Yadi Chen Huanchun |
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Institution: | Neutron Biology Research Center, Quantum Beam Science Directorate, Japan Atomic Energy Agency, 2-4 Shirakata-Shirane, Tokai, Ibaraki 319-1195, Japan. |
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Abstract: | The receptor binding to interleukin (IL)-13 is composed of the IL-13 receptor α1 chain (IL-13Rα1) and the IL-4 receptor α chain (IL-4Rα). In order to investigate the interaction of IL-13 with IL-13Rα1 and IL-4Rα, the DNA fragments coding the extracellular regions of human IL-13Rα1 and the IL-4Rα (containing a cytokine receptor homologous region) were fused with mouse Fc and expressed by a silkworm–baculovirus system. The expressed receptors were successfully purified by affinity chromatography using protein A, and the Fc region was removed by thrombin digestion. After further purification with anion-exchange chromatography, these receptors were used to investigate the ligand–receptor interaction. Size exclusion chromatography and SPR analysis revealed that mixture of IL-13 and IL-13Rα1 showed predominant affinity to IL-4Rα, although neither detectable affinity of IL-13 nor IL-13Rα1 was observed against IL-4Rα. Combining these data with the moderate affinity of IL-13 to IL-13Rα1, this indicates that IL-13 first binds to IL-13Rα1 and recruits consequently to IL-4R. |
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Keywords: | IL-13 IL-13 receptor α 1 chain IL-4 receptor α chain Silkworm Fc fusion |
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