侧链对β3-氨基酸中的转和螺旋的影响

科学领域:

• 酸的化学结构
• 结构生物学是结构生物学.
• 有机化学 有机化学

背景情况:

• β-氨基酸是具有N-O键的β-氨基酸的类似物.
• 了解形状对于药物设计和生物材料至关重要.
• 之前的研究已经确定了β-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-β-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-β-α-α-α-β-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α

研究的目的:

• 为了研究β(3) -氨基酸的构造性质.
• 为了确定侧链对二次结构的影响.
• 为了比较形状特征与β-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-β-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-β-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-β-α-α-β-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α-α.

主要方法:

• 核磁共振 (NMR) 光谱学 核磁共振 (NMR) 光谱学
• 红外 (IR) 光谱法 红外 (IR) 光谱法
• 循环二元化 (CD) 光谱学 循环二元化 (CD) 光谱学
• 在X射线晶体学.
• 理论研究理论研究.

主要成果:

• β(3) -氨基酸形成β-N-O转子和螺旋,由分子内键稳定.
• 与C (α) -C (β) 键相对的N-O键的构造因侧链大小而有所不同 (反或左).
• 在溶液 (β N-O 转/螺旋) 和固态 (平行板) 之间,形状不同.

结论:

• β 3 - - 氨基酸采用稳定的二次结构,包括β N-O转和螺旋.
• 侧链工程可以调节形状.
• 在固体和溶液状态之间存在着符合性可塑性.