在prolyl结合异体化对prolyl结合异体化能量的诱导作用:对原折叠和稳定性的影响
Eric S Eberhardt1, Nicholas Panisik, Ronald T Raines
1Contribution from the Department of Biochemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706-1569.
Journal of the American Chemical Society
|April 1, 2011
概括
在原蛋白中氨酸残留物的氧化增强了稳定性. 氨酸的替代物会影响胺键特性和转异构体度,影响原蛋白的折叠和稳定性.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 频谱学是一种光谱学.
背景情况:
- 原三环螺旋的稳定性通过林氧化增强.
- 在烯残留物上提取电子的替代剂具有已知的结构后果.
研究的目的:
- 为了研究修改后的プロ林残留物的动力和热力学特性.
- 了解诱导效应对原体稳定性的影响.
主要方法:
- 核磁共振 (NMR) 光谱学 核磁共振 (NMR) 光谱学
- 福里埃转换红外光谱法 (FTIR)
- 对修改后的烯 Ester 的动力学和热力学分析.
主要成果:
- 修改过的普罗林中的pK (a) 值下降 (普罗林 > 氧普罗林 > 氧普罗林).
- 胺I的振动模式按以下顺序下降:烯 Ester > 氧 Ester > 烯 Ester.
- 增加了跨同位素平衡度,随着电子吸收强度的增加.
结论:
- 诱导效应显著影响胺结合性质和转异构体的形成.
- 这些影响可能在原蛋白折叠和稳定性中起着至关重要的作用.
- 这些发现支持基氨酸残留在原蛋白结构完整性中的重要性.
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