通过调整形态灵活性来演变蛋白相互作用域家族
Dustin S Whitney1, Brian F Volkman1, Kenneth E Prehoda2
1Department of Biochemistry, Medical College of Wisconsin , Milwaukee, Wisconsin 53226, United States.
Journal of the American Chemical Society
|August 10, 2016
概括
蛋白质的灵活性对于功能至关重要. 突变降低了酸酶 (GK) 到GK蛋白相互作用域 (GKPID) 的灵活性,通过限制非功能性结构来优化其新功能.
科学领域:
- 生物化学
- 进化生物学
- 结构生物学
背景情况:
- 蛋白质需要特定的结构来发挥作用,但灵活性会导致非功能状态.
- 酸酶 (GK) 演变为GK蛋白相互作用域 (GKPID),提供了一个研究灵活性在功能进化中的作用的机会.
研究的目的:
- 研究蛋白质结构灵活性如何影响新蛋白质功能的演变.
- 在GKPID转化过程中分析酸酶的动态行为.
主要方法:
- 对祖先酸酶和进化的GKPID的动态行为进行比较分析.
- 研究历史突变对蛋白质灵活性和构造状态的影响.
主要成果:
- 祖先的GK酶表现出高度的灵活性,采用开放式 (核酸结合) 和闭合式 (催化) 构造.
- 导致GKPID的突变通过限制脊柱旋转,显著降低了灵活性.
- 减少灵活性防止了非功能性构造,优化了蛋白质伙伴的结合.
结论:
- 蛋白质的结构灵活性是蛋白质功能的一个关键的进化调节器.
- 优化灵活性的突变对于蛋白质适应新角色至关重要,比如GK到GKPID的过渡.
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