通过水桥的N-B相互作用:了解光蛋白基探头对氧酸盐的化学选择性
Zhi-jie Chen1, Ziqi Tian1, Karen Kallio2
1Department of Chemistry, University of California at Riverside , 501 Big Springs Road, Riverside, California 92521, United States.
Journal of the American Chemical Society
|March 29, 2016
概括
这项研究揭示了基因工程光传感器pnGFP如何实现对过氧化比过氧化的高选择性. 蛋白质支架中的胺残留物调节原子的原子.
科学领域:
- 生物化学 生物化学
- 化学生物学 化学生物学
- 蛋白质工程是指蛋白质工程.
背景情况:
- 酸和 Ester 是分子识别和化学传感的关键.
- 基因编码的光传感器可以精确检测特定的分析物.
- 过氧化 (ONOO(-)) 和过氧化 (H2O2) 是生物系统中的关键反应物种.
研究的目的:
- 阐明 pnGFP 传感器对过氧化和过氧化的化学选择性背后的机制.
- 了解蛋白质结构如何影响合并的酸部分的反应性.
- 探索设计基于工程蛋白质的新型,高度选择性的化学探针的潜力.
主要方法:
- 位点定向的突变发生改变特定的氨基酸残留物.
- 用X射线晶体学来确定高分辨率的蛋白质结构.
- -11核磁共振 (11B NMR) 光谱分析环境.
- 计算分析以建模分子相互作用和反应性.
主要成果:
- 与过氧化 (H2O2) 相比,pnGFP传感器对过氧化 (ONOO(-)) 具有异常的化学选择性.
- 在 pnGFP 支架内发现的一种胺残留物对传感器功能至关重要.
- 这种歇斯蒂丁残留物使水分子两极化,从而诱导染色体中原子的sp(3) 杂交.
- 这个结构特征调整了传感器对反应性氧和物种 (ROS/RNS) 的反应性.
结论:
- 这项研究提供了可调节的化学反应在折叠的非原生蛋白质中的第一个例子.
- 这些发现解释了 pnGFP 传感器中过氧酸盐选择性的机制.
- 这项工作对生物应用选择性光探针的合理设计具有重大意义.
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