设计模块化结蛋白与 Picomolar 亲缘关系的结构和能量贡献
Simon Hansen1, Dirk Tremmel1, Chaithanya Madhurantakam1
1Department of Biochemistry, University of Zürich , Winterthurerstrasse 190, 8057 Zürich, Switzerland.
Journal of the American Chemical Society
|February 16, 2016
概括
研究人员设计了设计重复蛋白 (dArmRP) 来实现真正的模块化结合. 这些dArmRP表现出可预测的,系统的结合 (KR) n,使定制的结合剂设计成为可能.
科学领域:
- 蛋白质工程
- 结构生物学
- 生物化学
背景情况:
- 天然重复蛋白 (nArmRP) 在结中表现出不完美的模块化,仅限于短序.
- 了解和改善蛋白质-相互作用对于设计新生物分子至关重要.
研究的目的:
- 开发和描述基于设计重复蛋白 (dArmRP) 的规范化,真正的模块化特异性结合蛋白.
- 研究dArmRP与交替的素和氨酸残留物 ((KR) n) 组成的的结合特性.
主要方法:
- 从自然重复蛋白 (nArmRP) 进行广泛的蛋白质工程,以创建统一设计的重复蛋白 (dArmRP).
- 对不同长度的dArmRP与 (KR) n的结合 afinities 的系统性表征.
- 在1.83 Å分辨率下确定dArmRP-复合物的晶体结构.
- 综合性突变性研究以确定关键侧链相互作用.
主要成果:
- 工程 dArmRP 显示与 (KR) n 的高度规律和模块化结合.
- 结合性表现出对的目标长度和内部重复次数有系统的指数依赖.
- 晶体结构证实了模块化结合模式,每个重复结合一个二单元.
- 突变性研究强调了单个侧链在识别方面的重要性.
结论:
- 该研究成功开发了dArmRP,在长时间内表现出真正的模块化识别.
- 这种模块化允许通过改变重复数和长度来预测结合亲和度.
- 这些发现为设计具有量身定制的特异性和亲属性的新型蛋白质结合剂提供了基础,通过组装二特异性模块.
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