Dynamic ubiquitination determines transcriptional activity of the plant immune coactivator NPR1

Dynamic ubiquitination determines transcriptional activity of the plant immune coactivator NPR1
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动态泛素化决定植物免疫辅激活因子 NPR1 的转录活性

DOI:
10.1101/582296
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发表时间:
2019
期刊:
--
影响因子:
--
通讯作者:
Skelly M
Skelly M
中科院分区:
--
文献类型:
--
作者:
Skelly M

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植物系统获得性抗性的激活与不稳定共激活因子NPR 1诱导的转录组重编程有关。免疫诱导的泛素化和蛋白酶体降解的NPR 1被认为是促进连续交付的活性NPR 1的目标启动子,从而最大限度地提高基因表达。由于这种潜在的昂贵的牺牲过程,我们研究了NPR 1的泛素化是否在其蛋白酶体周转之前发挥转录作用。在这里,我们表明NPR 1的泛素化是一个渐进的事件,其中Cullin-RING E3连接酶的初始修饰促进其染色质缔合和靶基因的表达。只有当NPR 1的多聚泛素化被E4连接酶UBE 4增强时,它才被蛋白酶体降解。相反,泛素连接酶活性与UBP 6/7相反,这两种蛋白酶体相关的去泛素化酶增强NPR 1的寿命。因此,免疫诱导的转录组重编程需要E3和E4连接酶的顺序作用,通过相反的去泛素化酶来平衡,所述去泛素化酶微调NPR 1的活性,而不严格要求其牺牲性周转。
Activation of systemic acquired resistance in plants is associated with transcriptome reprogramming induced by the unstable coactivator NPR1. Immune-induced ubiquitination and proteasomal degradation of NPR1 are thought to facilitate continuous delivery of active NPR1 to target promoters, thereby maximising gene expression. Because of this potentially costly sacrificial process, we investigated if ubiquitination of NPR1 plays transcriptional roles prior to its proteasomal turnover. Here we show ubiquitination of NPR1 is a progressive event in which initial modification by a Cullin-RING E3 ligase promotes its chromatin association and expression of target genes. Only when polyubiquitination of NPR1 is enhanced by the E4 ligase, UBE4, it is targeted for proteasomal degradation. Conversely, ubiquitin ligase activities are opposed by UBP6/7, two proteasome-associated deubiquitinases that enhance NPR1 longevity. Thus, immune-induced transcriptome reprogramming requires sequential actions of E3 and E4 ligases balanced by opposing deubiquitinases that fine-tune activity of NPR1 without strict requirement for its sacrificial turnover.
DOI: 10.1016/s1097-2765(02)00638-x
发表时间: 2002-09-01
期刊: MOLECULAR CELL
影响因子: 16
作者:
Leggett, DS;Hanna, J;Finley, D
通讯作者: Finley, D
DOI: 10.1111/j.1365-313x.2005.02617.x
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Earley, KW;Haag, JR;Pikaard, CS
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Spyracopoulos, L., Leng, R. P.:UBE4B 促进 Hdm2 介导的肿瘤抑制因子 p53 降解
DOI: --
发表时间: 2011
期刊: Nature Med.
影响因子: --
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Wu;H.;Pomeroy;S. L.;Ferreira;M.;Teider;N.;Mariani;J.;Nakayama;K. I.;Hatakeyama;S.
通讯作者: S.
[泛素和蛋白酶体]。
DOI: --
发表时间: 1994
期刊: Tanpakushitsu kakusan koso. Protein, nucleic acid, enzyme
影响因子: --
作者:
T. Tamura;K. Tanaka
通讯作者: K. Tanaka
DOI: 10.1016/j.chembiol.2003.08.010
发表时间: 2003-09-01
影响因子: --
作者:
Liu, YC;Lashuel, HA;Lansbury, PT
通讯作者: Lansbury, PT