序列动机重复数对蜘蛛丝蛋白膜中的蛋白质折叠的影响
Mirjam Hofmaier1,2, Julian E Heger3, Sarah Lentz4
1Institute of Physical Chemistry and Polymer Physics, Leibniz Institute of Polymer Research Dresden (IPF), Dresden 01069, Germany.
Biomacromolecules
|November 7, 2023
概括
工程蜘蛛丝蛋白 (eADF4(Cx)) 中的重复单元数量会影响它们的折叠和膜性质. 较高分子量变体 (x=4,8,16) 与较低分子量变体 (x=1,2) 相比,显示出不同的结构和更好的膜完整性.
科学领域:
- 生物材料科学是生物材料的科学.
- 蛋白质工程是一种蛋白质工程.
- 聚合物科学 聚合物科学
背景情况:
- 蜘蛛丝蛋白与多块共聚物一样,具有重复的序列图案.
- 基于Araneus diadematus spidroin 4 (ADF4) 的工程蜘蛛丝蛋白 (eADF4(Cx)) 作为内在无序蛋白 (IDP) 的模型.
- 重复单位的数量 (x) 决定了eADF4的分子量和潜在特性.
研究的目的:
- 研究改变重复序列动机的数量 (x=1,2,4,8,16) 对eADF4(Cx) 蛋白膜折叠的影响.
- 了解分子重量与工程蜘蛛丝膜的结构和物理特性之间的关系.
- 阐明基于eADF4的IDP系统的折叠动力学和薄膜特性.
主要方法:
- 在基板上造eADF4 (((Cx) 薄膜从六烯醇溶液.
- 通过甲醇蒸汽处理诱导β片形成.
- 采用一套分析技术,包括FTIR,循环二元化,圆测量,AFM,GISAXS,GIWAXS和接触角度测量.
主要成果:
- 片最初呈现出螺旋或随机的线圈结构,在甲醇蒸汽处理后过渡到晶体β片.
- 在较低 (x=1,2) 和较高 (x=4,8,16) 的分子量eADF4 (Cx) 变体之间观察到β-sheet含量,反平行β-sheet比,薄膜完整性,表面电位和异电点的显著差异.
- GISAXS和动力学研究证实了β片晶体生长率与最终晶体大小之间的相关性,分子重量影响了晶体生长动态.
结论:
- 分子重量显著影响eADF4 ((Cx) 系统的结构形成和薄膜特性.
- 较高分子量eADF4(Cx) 变体显示出增强的薄膜完整性和独特的结构特征.
- 这项研究提供了关于分子重量,折叠和材料特性在工程蜘蛛丝蛋白中的复杂相互作用的见解.
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