同进化信息捕获了催化功能,并揭示了合成酶的不同作用,域间连接
Charisse M Nartey1, Hyun Jo Koo2, Caroline Laurendon3
1Department of Biological Sciences, The University of Texas at Dallas, Richardson, Texas 75080, United States.
Biochemistry
|January 11, 2024
概括
了解蛋白质多样性需要绘制序列功能景观. 这项研究揭示了突变如何影响烟草5-epi-aristolochene synthase (TEAS) 和premnaspirodiene synthase (HPS) 酶的产品特异性,突出了它们进化强度的关键差异.
科学领域:
- 生物化学和分子生物学
- 蛋白质工程是指蛋白质工程.
- 进化生物学 进化生物学
背景情况:
- 蛋白质的功能多样性源于进化适应,通常在复杂的序列功能格局上可视化.
- 了解突变如何影响酶产品的特异性对于破译蛋白质进化至关重要.
研究的目的:
- 为了研究烟草5-epi-aristolochene合成酶 (TEAS) 和埃及汉麻 premnaspirodiene合成酶 (HPS) 产品特异性的控制机制.
- 为了比较TEAS和HPS中域相互作用的突变稳定性和催化作用.
主要方法:
- 为TEAS和HPS构建和生物化学分析两个大型组合突变库 (512个突变库).
- 应用一个序列波茨哈密尔顿模型和直接合分析来量化突变适应性和确定关键残留相互作用.
- 对HPS进行X射线晶体学,以阐明功能差异的结构基础.
主要成果:
- 与TEAS相比,HPS表现出明显更高的突变强度,TEAS显示出广泛的乱交.
- 哈密尔顿模型成功地预测了产品输出,根据基质特异性对酶进行聚类,并揭示了域间合的不同作用.
- 对于TEAS产品特异性而言,域间连接性更为关键,而对于HPS而言,触媒内域连接性更为重要.
结论:
- 酶产品的特异性是由残留物网络相互作用的独特模式所塑造的,在像TEAS和HPS这样的密切相关的酶之间存在显著差异.
- 基于结构和序列的分析揭示了这些酶如何实现催化精度和进化特异性的根本差异.
- 该研究提供了对蛋白质适应和多样性的生物物理基础的见解.
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