在高分辨率蛋白质晶体结构中的自接触Cys,Ser和Thr残留物:三级约束或键?
Prathvi Singh1, Venkatnarayanan Ramanathan2, Ramasubbu Sankararamakrishnan1,3
1Department of Biological Sciences and Bioengineering, Indian Institute of Technology Kanpur, Kanpur, India.
Protein science : a publication of the Protein Society
|November 16, 2024
概括
在Cys,Ser和Thr残留物中的残留物内部的键稳定蛋白质结构. 这些自我接触,特别是在Ser和Thr中,被证实是键,影响蛋白质构成和稳定性.
科学领域:
- 结构生物学 结构生物学
- 生物化学 生物化学
- 计算化学计算化学
背景情况:
- 蛋白质中的三级相互作用主要涉及氨基酸侧链.
- 在蛋白质结构和功能中,残留物内部相互作用,特别是自我接触的作用被低估了.
研究的目的:
- 为了研究和描述Cys,Ser和Thr残留中的残留内部键.
- 确定这些自我接触在蛋白质构造中的结构和功能意义.
主要方法:
- 分析了约5800个非冗余的高分辨率蛋白质结构,以识别自我接触.
- 在模型化合物上进行量子化学计算和自然键轨道 (NBO) 分析.
- 评估相互作用能量和扰动能量.
主要成果:
- 在Cys,Ser和Thr中确定了侧链S-H/O-H和骨干C=O组之间的1166个自我接触.
- 在Ser和Thr残留中的自我接触显示电荷转移和显著的扰动能量,与键一致.
- 自接触的Cys残留物被埋葬,靠近的方法由三级约束和分散力解释.
结论:
- 在Ser和Thr残留物中,残留物内部的键有助于循环/线圈形状的稳定性.
- 在Cys残留物中的自我接触主要是由三级结构约束驱动的.
- 建议进行进一步的突变研究,以验证这些自我接触残留物的结构和功能作用.
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