ZnCl2与氧化胰岛素B链结合位点和切割位点的质谱指认(英文) |
Site-specific Hydrolytic Cleavage of Oxidized Insulin B Chain with Zn(II) Ion Studied by Electrospray Ionization Mass Spectrometry and MS/MS Mass Spectrometry |
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摘要: 采用电喷雾质谱和串联质谱研究了氧化胰岛素B链与ZnCl2的键合作用并成功地确定了切割位点。质谱研究显示在pH值2.5及40 ℃条件下,Zn2+通过与氧化胰岛素B链的氨基酸侧链His5,His10和Arg22结合,选择性地水解了肽键Asn3-Gln4, His5-Leu6, Gly8-Ser9和Glu21-Arg22。 |
关键词: 氧化胰岛素B链 质谱 ZnCl2 水解切割 |
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Abstract: The bonding interaction and hydrolytic cleavage of oxidized insulin B chain with ZnCl2 in molar ratios of 1∶1 1∶2 and 1∶3 at pH value of 2.5 and 40 ℃ were investigated by electrospray ionization mass spectrometry and tandem mass spectrometry. The results show that the binding sites of Zn2+ with oxidized insulin B chain are Arg22 and imidazole groups of His5, His10, which leads to the selective cleavages of the peptide bonds at Asn3-Gln4, His5-Leu6, Gly8-Ser9 and Glu21-Arg22 of oxidized insulin B chain. |
Keywords: oxidized insulin B mass spectrometry ZnCl2 hydrolytic cleavage |
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蒋疆,梅毓华,王文继,吴琼洁,朱龙根.ZnCl2与氧化胰岛素B链结合位点和切割位点的质谱指认(英文)[J].无机化学学报,2007,23(6):948-956. |
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