弗吉尼亚氨酸跨转移酶聚基酸合成酶的分子体间通信的表征
Jonathan Dorival1, Thibault Annaval1, Fanny Risser1
1UMR 7365, Ingénierie Moléculaire et Physiopathologie Articulaire (IMoPA), CNRS-Université de Lorraine, Biopôle de l'Université de Lorraine , Campus Biologie Santé, 9 Avenue de la Forêt de Haye, CS 50184, 54505 Vandœuvre-lès-Nancy CEDEX, France.
Journal of the American Chemical Society
|March 17, 2016
概括
研究人员在模块化多基合成酶 (PKS) 中发现了一种新型的蛋白质对接域. 这些域对于生产有价值药物的细菌组装线至关重要,确保了链的准确生长.
科学领域:
- 生物化学
- 分子生物学
- 微生物学
背景情况:
- 模块化多基合成酶 (PKS) 是一个大型的酶复合体,负责细菌中合成多种二次代谢物.
- PKS的组装线性质依赖于连续的酶子单元之间的精确相互作用,以有效地延长链条.
- 这些子单元相互作用主要通过称为对接域 (DD) 的特定蛋白质-蛋白质相互作用模块进行介导.
研究的目的:
- 识别和描述跨转移酶PKS系统中的新型对接域家族.
- 阐明这些新发现的DD的结构和功能特性,特别是在维吉尼亚胺素 (Vir) 生物合成途径中.
- 模拟PKS组装线的子组接口,提供链增长忠实性的机制.
主要方法:
- 在跨转移酶PKS中发现一个新的对接域家族.
- 来自维吉尼胺系统的N端 (VirFG (N) DD) 和C端 (VirA (C) DD) 对接域的结构和生物物理特征.
- 使用定位突变来验证蛋白质-蛋白质复合结构.
- 使用小角度X射线散射 (SAXS) 来确定侧面域的相对位置.
主要成果:
- 在跨转移酶PKS中发现了一种新的对接域 (DD).
- N端对接域 (VirFG (N) DD) 单独表现出内在无序的特征,但在与其C端伴侣 (VirA (C) DD) 相互作用时形成稳定的折叠.
- 通过突变发生的数据确定了独特的蛋白质-蛋白质复合物拓.
- SAXS分析使相邻的乙载体蛋白和合成酶域的定位成为可能,从而促进了完整的子单元间接口的建模.
结论:
- 已识别的DD代表了PKS中的新类相互作用模块,扩大了我们对这些生物合成机制的理解.
- 在PKS组装线稳定和保证多基生物合成的可靠性方面,DDs之间的相互作用至关重要.
- 获得的结构洞察力为制造新型或改进的药物相关化合物的PKS提供了基础.
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