ESCRT-I Component VPS23A Affects ABA Signaling by Recognizing ABA Receptors for Endosomal Degradation.

ESCRT-I Component VPS23A Affects ABA Signaling by Recognizing ABA Receptors for Endosomal Degradation.
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ESCRT-I 组分 VPS23A 通过识别 ABA 受体的内体降解来影响 ABA 信号传导。

DOI:
10.1016/j.molp.2016.11.002
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发表时间:
2016-12
期刊:
Mol Plant
影响因子:
--
通讯作者:
Xie Qi
Xie Qi
中科院分区:
其他
文献类型:
--
作者:
Yu Feifei;Lou Lijuan;Tian Miaomiao;Li Qingliang;Ding Yanglin;Cao Xiaoqiang;Wu Yaorong;Belda-Palazon Borja;Rodriguez Pedro L;Yang Shuhua;Xie Qi

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PYR/PYL/RCAR型脱落酸(阿坝)受体的发现是近十年来植物科学的重大进展之一。在哺乳动物中,内体分选作为下调不同类型受体的重要途径,但其在植物激素信号传导中的作用知之甚少。本研究发现,ESCRT-I中的一个关键组分--泛素E2样蛋白VPS 23 A对阿坝信号通路具有负调控作用,VPS 23 A与PYR/PYL/RCAR型阿坝受体之间存在上位性关系,VPS 23 A的阻断可增强阿坝信号通路中关键激酶OST 1的活性。此外,VPS 23 A与PYR 1/PYL和K63连接的双泛素相互作用,并且PYL 4在体内具有K63连接的泛素化修饰。进一步分析表明,VPS 23 A影响PYR 1的亚细胞定位和PYL 4的稳定性。总而言之,我们的结果表明VPS 23 A通过液泡介导的降解影响PYR 1/PYL 4,从而为植物激素信号传导中阿坝受体和ESCRT的转换提供了深入的了解。
Recent discovery of PYR/PYL/RCAR-type abscisic acid (ABA) receptors has become one of most significant advances in plant science in the past decade. In mammals, endosomal sorting acts as an important pathway to downregulate different types of receptors, but its role in plant hormone signaling is poorly understood. Here, we report that an ubiquitin E2-like protein, VPS23A, which is a key component of ESCRT-I, negatively regulates ABA signaling.VPS23Ahas epistatic relationship withPYR/PYL/RCAR-type ABA receptors and disruption ofVPS23Aenhanced the activity of key kinase OST1 in the ABA signaling pathway under ABA treatment. Moreover, VPS23A interacts with PYR1/PYLs and K63-linked diubiquitin, and PYL4 possesses K63-linked ubiquitinated modificationin vivo. Further analysis revealed that VPS23A affects the subcellular localization of PYR1 and the stability of PYL4. Taken together, our results suggest that VPS23A affects PYR1/PYL4 via vacuole-mediated degradation, providing an advanced understanding of both the turnover of ABA receptors and ESCRTs in plant hormone signaling.
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