植物JAZ蛋白的功能概述

Comprehensive Overview of JAZ Proteins in Plants

茉莉酸作为重要的植物激素,在植物生长、繁殖和抗逆等诸多方面起重要的作用。茉莉酸途径的抑制因子JAZ(Jasmonate ZIM-domain,JAZ)蛋白(JAZs)是调节茉莉酸(JA)激素应答的关键因子,在没有JA存在时,JAZs抑制DNA-结合转录因子活性,从而调控JA应答基因转录;当有JA存在时,JAZs和冠菌素不敏感1(Coronatine insensitive 1,COI1)依赖JA分子发生互作,复合体被SCFCOI1识别并进入26S蛋白酶解途径降解,释放的转录因子启动JA应答基因转录。随着研究的深入,发现JAZs可以与许多转录因子互作,不仅调控了JA信号响应,还参与了其他激素信号通路。对JAZs的互作机制进行描述,阐述JAZs在植物激素调控网络中的作用。

Jasmonates（JA）as an important phytohormone regulates many aspects of plant development, reproduction, and defence. Within the JA signaling cascades, jasmonate zim-domain（JAZ）proteins that are triggered by jasmonates play a central role. JAZ proteins regulate JA-responsive gene transcription by inhibiting DNA-binding transcription factors（TFs）in the absence of JA. However, in the presence of JA, JAZ proteins interact in a hormone-dependent manner with Coronatine Insensitive 1（COI1）. After recognition component of the E3 ubiquitin ligase SCFCOI1, as a result, JAZ proteins are ubiquitinated and subsequently degraded in the 26S proteasome, releasing TFs from inhibition and activating JA-responsive gene transcription. This conclusion indicate that JAZ proteins, which function as transcriptional repressors of the JA signaling response, are not merely regulators of the JA signaling pathway, but, through interaction with other proteins, also serve as signaling hubs in the wider hormone regulatory network, plays important roles in plants..