人类神经球蛋白和H64A远端变异:突变和pH如何影响血红囊袋
Mirco Meglioli1, Laura Cesati2, Gianantonio Battistuzzi1
1Department of Chemical and Geological Sciences, University of Modena and Reggio Emilia, via Campi 103, 41125 Modena, Italy.
概括
pH影响神经球蛋白 (Ngbs) 的结构和功能. 在H64A变体中,远端His64位移允许Lys67在性pH下结合血,改变蛋白质的动态和稳定性.
科学领域:
- 生物化学 生物化学
- 蛋白质结构 蛋白质结构
- 血红蛋白是一种血红蛋白.
背景情况:
- 神经球蛋白 (Ngbs) 是对氧气运输和储存至关重要的血红蛋白.
- 在Ngbs中,远端的His64残留物调节了铁可用于连接器的可访问性.
- 了解pH依赖的结构变化对于Ngb的功能至关重要.
研究的目的:
- 研究pH对野生类型 (WT) 和H64A人类神经球蛋白的影响.
- 阐明在ngb活性位点中pH诱导的结构重组的分子机制.
- 确定远端残留物在调节Ngb构造和稳定性中的作用.
主要方法:
- 紫外线-Vis电子吸收光谱学
- 磁性圆形二元化 (MCD) 是一种
- 响应式拉曼光谱法 响应式拉曼光谱法
- 解决状态分析 解决状态分析
主要成果:
- 由于稳定的双基协调,WT Ngb与pH发生了轻微的乙烯基替代剂变化.
- 在性pH值下,H64A变异呈现出显著的结构变化,Lys67与heme协调.
- 在H64A变体中,性pH诱导了结和乙烯替代剂构成的改变.
- 由Lys67去质子化驱动的E-螺旋修改,被建议用于WT和变种.
结论:
- 远端残留物在血红素结合和活性位点稳定性中起着基本作用.
- 在H64A变体中,Lys67的pH依赖协调突出显示了替代的联结路径.
- Ngb的结构可塑性受到E-螺旋和活性部位环境中pH介导的修改的影响.
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