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阶段分离胰岛素聚合物的拉曼光谱洞察力

Sandip Dolui¹, Anupam Roy¹, Uttam Pal¹

¹Structural Biology and Bioinformatics Division, Indian Institute of Chemical Biology, Council of Scientific and Industrial Research, 4, Raja S.C. Mullick Road, Kolkata 700032, India.

ACS physical chemistry Au

|May 27, 2024

概括

拉曼光谱揭示了牛胰岛素聚合物的结构变化. 纤维状胰岛素显示了胺I带的改变和螺旋信号的减弱,表明相位分离和聚合.

科学领域:

生物物理学的生物物理.
结构生物学结构生物学
蛋白质化学蛋白质化学

背景情况:

蛋白质聚合与各种人类疾病有关.
了解蛋白质聚合过程中的结构转变对于疾病病理学研究至关重要.
牛胰岛素是研究聚合机制的模型蛋白质.

研究的目的:

为了研究牛胰岛素聚合物的详细拉曼光谱特征.
阐明在现场形成的不同牛胰岛素聚合物物种的结构复杂性.
为了识别表明蛋白质相分离和聚合行为的拉曼标记物.

主要方法:

在高温 (60°C) 处在现场形成牛胰岛素聚合物.
拉曼光谱分析原生类,单质,寡质和纤维状胰岛素.
对胺I波段转移和低频骨干信号的分析.

主要成果:

原生类胰岛素的胺I带在1655厘米−1显示,这表明高α-螺旋含量.
混乱的结构 (转,卷轴) 存在于单质和寡质状态 (~1680 cm-1).
纤维状聚合物表现出胺I带偏移到~1671 cm−1,螺旋信号减弱 (~935 cm−1).
在纤维细胞形成过程中,氨酸残留物进入了更为疏水的环境.
纤维状胰岛素中的二硫化键变得紧张,采用单一的形状.

结论:

拉曼光谱有效地追踪牛胰岛素的相分离和聚合.
特定的光谱特征,如胺I带转移和螺旋信号强度,可以作为可靠的标记.
对胰岛素聚合的结构洞察力可以为了解相关蛋白质病变的理解提供信息.

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