稳定协同相互作用的静电起源在一个三元卷轴卷轴中的b-,c-和f-残留物之间
Nicholas A Dalley1, Kimberlee L Stern1, Richard R Kitchen1
1Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT 84602.
Peptide science (Hoboken, N.J.)
|June 17, 2024
概括
蛋白质卷卷中的溶剂暴露位置上的相互作用显著影响稳定性. 由Lys7和Tyr14影响的Glu10和Lys18之间的特定相互作用主要是静电的.
科学领域:
- 蛋白质结构和生物物理学
- 分子相互作用和稳定性
背景情况:
- 卷曲线圈是常见的蛋白质结构,对于正规的七角形位置 (a,d,e,g) 有着很好的理解作用.
- 暴露于溶剂的位置 (b,c,f) 通常被认为对稳定性不那么重要.
- 新出现的证据强调了b,c和f残留物之间的相互作用对卷轴稳定性的重要性.
研究的目的:
- 调查溶剂暴露残留物在卷轴-卷轴形状稳定性中的作用.
- 为了表征一个特定的长距离协同作用的特征,在一个三元卷线圈.
主要方法:
- 在卷轴内特定残留物的位点定向突变发生.
- 使用盐和变质剂梯度分析蛋白质稳定性的分析.
- 对稳定性突变影响的热力学分析 (ΔΔΔG).
主要成果:
- 在b位置Glu10和c位置Lys18 (ΔΔΔG = -0.65 ± 0.02 kcal/mol) 之间确定了稳定性的长距离协同相互作用.
- 这种相互作用的稳定性取决于f位置残留物Lys7和Tyr14的存在.
- 突变分析表明,这种相互作用主要是静电的,其中Tyr14的结能力有所贡献.
结论:
- 涉及暴露于溶剂的残留物 (b,c,f) 的相互作用对于卷轴稳定性至关重要.
- 远程静电相互作用,由特定的残留物定位和特性调节,起着重要的作用.
- 这些发现挑战了传统的假设,即溶剂暴露的位置具有广泛的变异性.
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