在一个高分辨率的绿色光蛋白结构中可视化质子天线
Ai Shinobu1, Gottfried J Palm, Abraham J Schierbeek
1The Fritz Haber Research Center, Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel.
Journal of the American Chemical Society
|August 12, 2010
概括
研究人员首次在绿色光蛋白 (GFP) 中可视化了质子收集装置. 这种碳酸盐和水分子网络有助于道质子,澄清GFP.
科学领域:
- 结构生物学 结构生物学
- 生物物理学的生物物理.
- 蛋白质科学 蛋白质科学
背景情况:
- 蛋白质中的质子收集天线,拟用于通过键 (HB) 网络促进质子转移,缺乏直接可视化.
- 了解质子动态对于酶机制和细胞过程至关重要.
研究的目的:
- 以前所未有的分辨率在绿色光蛋白 (GFP) 中可视化和描述质子采集装置和质子线网络.
- 为了研究蛋白质结构,水含量和质子线形成之间的相关性.
主要方法:
- 绿色光蛋白 (GFP) 的高分辨率X射线晶体学 (0.9 Å).
- 使用算法绘制蛋白质结构内的质子线的计算分析.
- 对100多种GFP突变物进行系统研究,以评估水含量和分辨率.
主要成果:
- 这项研究提供了迄今为止GFP的最高分辨率的X射线结构,可以识别关键的原子和质子化状态.
- 在GFP表面上发现了一种新型的质子收集装置,包括碳酸盐,氨酸和由HB网络与Glu5连接的水分子.
- 确认了将Glu222连接到Glu5的"活动现场线",以及通过Asn146和His148.8.6通过新发现的质子退出点.
- 在GFP结构中增加的水含量与更高分辨率和更大的质子线网络相关.
结论:
- 在GFP中对质子收集装置的直接可视化支持了提出的质子转移和收集机制.
- 研究结果表明,来自野生型GFP的光解离质子可以退出蛋白质,并通过确定的收集装置补充.
- 该研究强调了蛋白质水合的动态性质及其在促进质子转移通路的关键作用.
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