含有循环α,α-异位氨基酸的螺旋模板:环尺寸对形状和siRNA传递的影响
Takahito Ito1, Takuma Kato2, Nobumichi Ohoka1
1National Institute of Health Sciences, 3-25-26 Tonomachi, Kawasaki-ku, Kawasaki-shi, Kanagawa 210-9501, Japan.
The Journal of organic chemistry
|January 8, 2026
概括
循环α,α-非替代氨基酸 (dAAs) 稳定了螺旋,环的大小显著影响了螺旋结构和功能. 与较大的环相比,像Ac3c这样的较小环可以引入应变,减少螺旋体的稳定性和生物活性.
科学领域:
- 药用化学 医学化学
- 结构生物学 结构生物学
- 生物技术是生物技术.
背景情况:
- 循环α,α-非替代氨基酸 (dAAs) 对于稳定二次结构,特别是螺旋至关重要.
- 循环dAAs环大小对螺旋形状和稳定性的影响尚未完全理解.
- 了解这些影响对于设计新的基于的治疗方法和输送系统至关重要.
研究的目的:
- 研究不同循环DAA (Ac3c,Ac4c,Ac5c) 对螺旋稳定性的影响.
- 阐明酸中环大小依赖的螺旋稳定结构的基础.
- 评估将这些循环dAAs纳入用于siRNA输送的细胞透联的功能后果.
主要方法:
- 设计和合成含有1-aminocyclopropane-1-carboxylic 酸 (Ac3c),1-aminocyclobutane-1-carboxylic 酸 (Ac4c) 和1-aminocyclopentane-1-carboxylic 酸 (Ac5c) 的模板.
- 循环二重化 (CD) 和红外 (IR) 光谱法用于分析溶液中的螺旋结构.
- 用X射线晶体学来确定含有Ac3c和Ac4c的固态结构.
- 用于功能测定,将修改后的合物纳入细胞透的合物 (Block3衍生物) 中.
主要成果:
- 含有Ac3c,Ac4c和Ac5c残留的寡合体通过CD和IR光谱学在溶液中显示出稳定的螺旋结构.
- X射线晶体学揭示了在含有Ac3c和Ac4c的中由特定的键 (i → i+3和i → i+4) 稳定起来的精确的右螺旋.
- 与Ac4c和Ac5c相比,Ac3c中的环应变降低了其直升效应,影响了脊柱扭转角度和键.
- 经Ac4c和Ac5c修改的Block3衍生物保持了螺旋性,并促进了siRNA内部化,而Ac3c模拟物失去了螺旋结构和活性.
结论:
- 循环dAAs是诱导和稳定螺旋的有效模块,环的大小是关键决定因素.
- 这项研究提供了新的结构洞察力,了解环形大小如何影响骨形状和螺旋稳定性.
- 这些发现为创建折膜和优化基于的药物递送系统提供了设计原则,特别突出了与环应变相关的功能性权衡.
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