通过分子利用激素受体复杂性的演变
Jamie T Bridgham1, Sean M Carroll, Joseph W Thornton
1Center for Ecology and Evolutionary Biology, University of Oregon, Eugene, OR 97403, USA.
Science (New York, N.Y.)
|April 8, 2006
概括
进化生物学通过自然选择来解释复杂的系统. 这项研究表明,矿物质皮质类受体的受体是如何作用的.
科学领域:
- 进化生物学 进化生物学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 达尔文理论认为,生物复杂性是通过渐进的适应和自然选择产生的.
- 高度集成的生物系统,其中的组件相互依赖,对理解逐步进化的起源构成挑战.
- 阿尔多斯特与矿物质皮质体受体之间的特定相互作用是这种紧密集成的系统的典范.
研究的目的:
- 为了研究阿尔多斯特-矿物甲基皮质受体相互作用的进化途径.
- 为了证明复杂的分子相互作用如何通过达尔文的逐步过程进化.
- 阐明分子利用在功能伙伴关系演变中的作用.
主要方法:
- 祖先基因复活技术被用来重建古代受体变异.
- 复活的祖先受体与阿尔多斯特和相关联体的结合亲和力被实验评估.
- 用于引入特定的氨基酸变化到祖先的受体序列.
主要成果:
- 祖先的矿物质皮质体受体表现出对阿尔多的固有亲和力,早于激素的进化.
- 这种亲和力是受体与化学上相似的祖先配体相互作用的副产品.
- 在祖先的受体中引入两种特定的氨基酸替代,重建了现代受体的特异性.
结论:
- 复杂的分子相互作用,如阿尔多素受体合作伙伴关系,可以通过一个渐进的达尔文过程进化.
- 分子利用,即现有的分子结构被重新用于新的功能,是进化集成系统的关键机制.
- 这项研究为了解激素受体特异性和复杂的生物机械的演变提供了分子基础.
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