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一个门锁锁机制,用于通过酸受体传递激素信号
Karsten Melcher1, Ley-Moy Ng, X Edward Zhou
1Laboratory of Structural Sciences, Van Andel Research Institute, 333 Bostwick Avenue, N.E., Grand Rapids, Michigan 49503, USA.
Nature
|November 10, 2009
概括
酸 (ABA) 信号传递涉及PYR/PYL/RCAR受体与激素结合. 这种结合触发了门锁锁机制,抑制下游的PP2C酸酶并调节植物反应.
科学领域:
- 植物生物学 植物生物学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 酸 (ABA) 是一种关键的植物激素,调节生长,发育和应激反应.
- PYR/PYL/RCAR蛋白调解ABA作用,但激素结合和下游抑制的确切机制尚不清楚.
研究的目的:
- 阐明PYR/PYL/RCAR受体对ABA感知和信号的结构机制.
- 了解ABA与受体结合如何导致2C型蛋白酸酶 (PP2Cs) 的抑制.
主要方法:
- 使用X射线晶体学来确定apo和ABA结合的PYR/PYL/RCAR受体的结构.
- 确定了PYL2-ABA-PP2C的三元复杂结构,以可视化相互作用.
主要成果:
- 阿波受体具有一个开放的连接体结合口袋.
- 结合ABA会在保存的β循环中诱导构造变化,关闭一个门和锁机制.
- 这种由ABA诱导的闭合形成了PP2C结合的抑制接口,并通过保留的托进一步稳定.
结论:
- 一个保存的门锁锁机制控制了ABA的感知和信号.
- 这种机制解释了ABA与PYR/PYL/RCAR受体的结合如何导致PP2C抑制.
- 这些发现为了解ABA介导的植物反应提供了结构性基础.
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