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拟南芥五肽重复序列蛋白SOAR1在脱落酸信号传导中起关键作用。

Arabidopsis pentatricopeptide repeat protein SOAR1 plays a critical role in abscisic acid signalling.

作者信息

Mei Chao, Jiang Shang-Chuan, Lu Yan-Fen, Wu Fu-Qing, Yu Yong-Tao, Liang Shan, Feng Xiu-Jing, Portoles Comeras Sergi, Lu Kai, Wu Zhen, Wang Xiao-Fang, Zhang Da-Peng

机构信息

MOE Systems Biology and Bioinformatics Laboratory, Center for Plant Biology, School of Life Sciences, Tsinghua University, Beijing 100084, China.

MOE Systems Biology and Bioinformatics Laboratory, Center for Plant Biology, School of Life Sciences, Tsinghua University, Beijing 100084, China

出版信息

J Exp Bot. 2014 Oct;65(18):5317-30. doi: 10.1093/jxb/eru293. Epub 2014 Jul 8.

DOI:10.1093/jxb/eru293
PMID:25005137
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4157714/
Abstract

A dominant suppressor of the ABAR overexpressor, soar1-1D, from CHLH/ABAR [coding for Mg-chelatase H subunit/putative abscisic acid (ABA) receptor (ABAR)] overexpression lines was screened to explore the mechanism of the ABAR-mediated ABA signalling. The SOAR1 gene encodes a pentatricopeptide repeat (PPR) protein which localizes to both the cytosol and nucleus. Down-regulation of SOAR1 strongly enhances, but up-regulation of SOAR1 almost completely impairs, ABA responses, revealing that SOAR1 is a critical, negative, regulator of ABA signalling. Further genetic evidence supports that SOAR1 functions downstream of ABAR and probably upstream of an ABA-responsive transcription factor ABI5. Changes in the SOAR1 expression alter expression of a subset of ABA-responsive genes including ABI5. These findings provide important information to elucidate further the functional mechanism of PPR proteins and the complicated ABA signalling network.

摘要

为了探究ABAR介导的脱落酸（ABA）信号传导机制，我们从CHLH/ABAR[编码镁螯合酶H亚基/假定的脱落酸（ABA）受体（ABAR）]过表达系中筛选出了ABAR过表达体soar1-1D的显性抑制子。SOAR1基因编码一种定位于细胞质和细胞核的五肽重复（PPR）蛋白。SOAR1的下调强烈增强了ABA反应，但SOAR1的上调几乎完全损害了ABA反应，这表明SOAR1是ABA信号传导的关键负调节因子。进一步的遗传学证据支持SOAR1在ABAR下游起作用，可能在ABA响应转录因子ABI5的上游起作用。SOAR1表达的变化改变了包括ABI5在内的一部分ABA响应基因的表达。这些发现为进一步阐明PPR蛋白的功能机制和复杂的ABA信号网络提供了重要信息。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9896/4157714/002e11940e10/exbotj_eru293_f0005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9896/4157714/0534b56579ef/exbotj_eru293_f0001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9896/4157714/736e15bb2990/exbotj_eru293_f0002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9896/4157714/d36c0f35cb88/exbotj_eru293_f0003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9896/4157714/649a737542c8/exbotj_eru293_f0004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9896/4157714/002e11940e10/exbotj_eru293_f0005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9896/4157714/0534b56579ef/exbotj_eru293_f0001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9896/4157714/736e15bb2990/exbotj_eru293_f0002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9896/4157714/d36c0f35cb88/exbotj_eru293_f0003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9896/4157714/649a737542c8/exbotj_eru293_f0004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9896/4157714/002e11940e10/exbotj_eru293_f0005.jpg

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