Nat Commun:基于半胱氨酸的分子编码胶原C-前肽

2018-10-18 MedSci MedSci原创

关于胶原蛋白生物合成的基本问题,特别是同源三聚体与异三聚体组装的分子起源,仍然尚未清楚。 本研究中,我们证明了I型胶原蛋白C-前肽结构域中单个半胱氨酸的存在或不存在是控制给定胶原多肽稳定同源三聚体的能力的关键因素。此外,我们还确定了Ca2 +在非共价胶原蛋白C-前肽三聚化中的关键作用,从而引发蛋白质用于二硫键介导的共价永恒化。所得到的用于稳定组装的基于半胱氨酸的代码提供了分子模型,该分子模型

关于胶原蛋白生物合成的基本问题,特别是同源三聚体与异三聚体组装的分子起源,仍然尚未清楚。

本研究中,我们证明了I型胶原蛋白C-前肽结构域中单个半胱氨酸的存在或不存在是控制给定胶原多肽稳定同源三聚体的能力的关键因素。此外,我们还确定了Ca2 +在非共价胶原蛋白C-前肽三聚化中的关键作用,从而引发蛋白质用于二硫键介导的共价永恒化。所得到的用于稳定组装的基于半胱氨酸的代码提供了分子模型,该分子模型可以用于预测胶原同源三聚体的身份,以及天然存在的2:1和1:1:1异源三聚体的身份。此外,该代码适用于所有序列不同的纤维状胶原蛋白。

这些结果为如何利用二硫键网络微调蛋白质组装提供了新的见解,并将为组装成特定寡聚体形式的设计蛋白质的持续发展提供研究基础。

原始出处:

Andrew S. DiChiara, Rasia C. Li, et al,. A cysteine-based molecular code informs collagen C-propeptide assembly. Nat Commun. 2018; 9: 4206.

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    2019-07-10 liuli5079
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    2018-10-25 liye789132251
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