一个保存的ARF-DNA接口是辅酶触发的转录反应的基础
Juriaan Rienstra1, Vanessa Polet Carrillo-Carrasco1, Martijn de Roij1
1Laboratory of Biochemistry, Wageningen University, Wageningen 6708WE, The Netherlands.
概括
辅酶响应因子 (ARF) 转录因子调节植物生长. 在ARF中保存的DNA结合残留物确保了稳定的辅酶信号传递,而C类ARF在进化早期会分离.
科学领域:
- 植物分子生物学 植物分子生物学
- 进化遗传学的进化遗传学
- 植物的信号传输.
背景情况:
- 辅酶响应因子 (ARF) 转录因子对于植物中的辅酶信号传递至关重要.
- ARF通过其B3域将DNA与辅酶反应元件 (AuxREs) 结合.
- 有三个ARF类 (A,B,C) 存在着不同的DNA结合特性,但这种分歧的进化基础尚不清楚.
研究的目的:
- 为了研究ARFDNA结合分歧的分子决定因素.
- 了解ARFDNA结合特异性的进化历史.
- 探索ARF B3域的功能性保护和可互换性.
主要方法:
- 在陆地植物中对ARF B3域序列进行比较分析.
- 使用模型肝草 (Marchantia polymorpha) 的功能性测试.
- 在不同的ARF类之间进行跨物种域交换.
主要成果:
- 在陆地植物中,ARF B3域中的关键DNA结合残留物高度保存.
- 这些残留物的可变性仅限于气管细胞,与ARF家族扩张相关.
- *Marchantia polymorpha*实验证实了保存残留的重要作用,并显示了ARF B3-AuxRE接口对突变的耐受性较低.
- A/B 类 ARF B3 域非常可互换,甚至跨越古老的血统.
- C类ARF的DNA结合特异性可能在菌体进化的早期出现分歧.
结论:
- ARF B3-DNA相互作用的保存性表明了强大的进化约束.
- C类ARF的早期分歧和随后的A/B类ARF的选择塑造了当前的ARF曲目.
- 了解ARF进化提供了关于植物发育和信号通路的见解.
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