在8M尿素中的非化蛋白质中保持与原生类型拓学的持久性
1Department of Biological Chemistry, The Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA. shortle@welchlink.welch.jhu.edu
Science (New York, N.Y.)
|July 21, 2001
概括
即使在变质时,蛋白质也保留了一些结构. 剩余的二极合揭示了葡萄球菌核酶在8M尿素中保持了与原生类似的拓,挑战了标准的蛋白质折叠模型.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 生物物理学的生物物理.
背景情况:
- 蛋白质展开是各种生物功能和疾病的关键过程.
- 标准模型表明在变质后结构完全丧失.
研究的目的:
- 为了研究化蛋白质中的残留结构.
- 测量蛋白质展开过程中拓信息的持久性.
主要方法:
- 利用剩余二极合 (RDC) 来研究蛋白质结构.
- 在应力聚烯胺凝中面向变质的葡萄球菌核酶.
- 应用高度的尿素 (高达8M) 来诱导变质.
主要成果:
- 观察到个人残留物RDC之间的高度显著的相关性.
- 证明了连锁段 (拓) 的持久的本地式空间定位和定向.
- 发现,在蛋白质达到紧的构造之前,存在长距离的排序.
结论:
- 蛋白质展开不会导致结构信息的完全丧失.
- 拓信息可以保留在变质状态下.
- 这些发现挑战了现有的蛋白质折叠模型,表明了压缩前排序.
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