The Arabidopsis gene SIGMA FACTOR-BINDING PROTEIN 1 plays a role in the salicylate- and jasmonate-mediated defence responses.
The Arabidopsis gene SIGMA FACTOR-BINDING PROTEIN 1 plays a role in the salicylate- and jasmonate-mediated defence responses.
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拟南芥基因sigma因子结合蛋白1在水杨酸盐和贾斯酯介导的防御反应中起作用。
DOI：
10.1111/j.1365-3040.2009.02109.x
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发表时间：
2010-05
期刊：
影响因子：
--
通讯作者：
Xia Y
中科院分区：
文献类型：
--
作者：
Xie YD;Li W;Guo D;Dong J;Zhang Q;Fu Y;Ren D;Peng M;Xia Y
叶绿体定位的SIB1蛋白先前通过其与SIGMA FACTOR 1 （SIG1）的相互作用被鉴定，SIG1是负责质体基因转录的RNA聚合酶机制的一个组成部分。SIB1的生理功能尚不清楚。我们发现SIB1的表达可被丁香假单胞菌感染诱导，提示其可能参与防御反应。sib1功能缺失突变破坏了病原体感染和水杨酸（SA）和茉莉酸（JA）这两种防御反应中的关键信号分子所触发的一些防御相关基因的诱导。相反，SIB1的组成型过表达导致植物在病原体感染或SA和JA处理后过度激活防御相关基因，从而增强对丁香假单胞菌感染的抗性。SIB1是植物特异性VQ基序蛋白家族的一员，可能是连接防御信号与叶绿体功能的纽带。
The chloroplast-localized SIB1 protein was previously identified by its interaction with SIGMA FACTOR 1 (SIG1), a component of the RNA polymerase machinery responsible for transcription of plastid genes. The physiological function of SIB1 is little known. We found that expression of SIB1 is induced by infection with Pseudomonas syringae, suggesting its possible involvement in the defence response. The sib1 loss-of-function mutation compromises induction of some defence-related genes triggered by pathogen infection and the treatments with salicylic acid (SA) and jasmonic acid (JA), two key signalling molecules in the defence response. Conversely, constitutive over-expression of SIB1 causes the plants to hyper-activate defence-related genes following pathogen infection or the SA and JA treatments, leading to enhanced resistance to infection by P. syringae. SIB1 is a member of the large plant-specific VQ motif-containing protein family, and might act as a link to connect defence signalling with chloroplast function.
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