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Company: VWR
Catalog#: 945300
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In vitro Reconstitution Assays of Arabidopsis 20S Proteasome
Author:
Date:
2021-04-05
[Abstract]  

The majority of cellular proteins are degraded by the 26S proteasome in eukaryotes. However, intrinsically disordered proteins (IDPs), which contain large portions of unstructured regions and are inherently unstable, are degraded via the ubiquitin-independent 20S proteasome. Emerging evidence indicates that plant IDP homeostasis may also be controlled by the 20S proteasome. Relatively little is known about the specific functions of the 20S proteasome and the regulatory mechanisms of IDP degradation in plants compared to other species because there is a lack of systematic protocols for in vitro assembly of this complex to perform in vitro degradation assays. Here, we present a detailed protocol of in vitro reconstitution assay of the 20S proteasome in Arabidopsis by modifying previously

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[摘要]  [摘要]大多数细胞蛋白的s的降解通过26S在真核生物蛋白酶。但是,内在无序的蛋白质(IDPs)包含大量的非结构化区域,并且内在地不稳定,因此很容易通过不依赖泛素的20S蛋白酶体降解。越来越多的证据最近显示ň植物境内流离失所者的平衡也可以通过20S蛋白酶控制。但是,由于缺乏用于体外分离20S蛋白酶体和降解测定的系统协议,因此我们对植物中IDP和20S蛋白酶体降解的功能和调控机制的研究和理解一直处于婴儿期与其他生物。在这里,我们通过采用和修改先前公开的方法,对拟南芥中20S蛋白酶体进行体外重组测定的详细方案。在此获得20S核心蛋白酶体的主要策略是从26S蛋白酶体中去除19S调节亚基。该协议包括两个主要部分:1)的来自表达表位标记的PAG1稳定的转基因品系20S蛋白酶体亲和纯化,的20S蛋白酶(程序AD)的基本组成部分; 2 )体外20S蛋白酶体降解测定法(方法E)。我们预计该协议将提供一种简单有效的方法来研究体外20S蛋白酶体降解,并促进植物中蛋白质代谢的研究。

[背景]蛋白质的降解通常是通过真核生物中的蛋白酶体来实现的。整合的26S蛋白酶体由两个亚颗粒组成:一个或两个末端的19S调节颗粒(RP),用作蛋白酶体激活剂;和20S核心蛋白酶体(CP),执行降解过程。大多数真核蛋白被多聚泛素化并导入26S蛋白酶体进行降解。然而,含有固有蛋白质无序已发现的区域直接通过破坏一个由20S蛋白酶的泛素依赖性降解(本日产等人,2014) ...

An HPLC-based Method to Quantify Coronatine Production by Bacteria
Author:
Date:
2017-03-05
[Abstract]  Coronatine is a polyketide phytotoxin produced by several pathovars of the plant pathogenic bacterium Pseudomonas syringae. It is one of the most important virulence factors determining the success of bacterial pathogenesis in the plant at both epiphytic and endophytic stages of the disease cycle. This protocol describes an optimized procedure to culture bacterial cells for coronatine production and to quantify the amount of coronatine secreted in the culture medium using an HPLC-based method. [摘要]  冠心病是由植物病原菌的几种病原体产生的聚酮化合物植物毒素。它是在疾病周期的附生和内生期阶段确定植物细菌发病机制成功的最重要的毒力因素之一。该方案描述了用于培养用于冠状病毒产生的细菌细胞的优化方法,并且使用基于HPLC的方法定量培养基中分泌的冠状动脉的量。

背景 Coronatine(COR)是有效的细菌植物毒素,是植物激素茉莉酮酸-L异亮氨酸(JA-Ile)的分子模拟物。因此,COR激活茉莉酸(JA)信号传导,诱导JA响应基因,并拮抗免疫信号水杨酸的作用。 COR由两种成分组成:冠心病(CFA)和冠状氨酸(CMA)。编码CMA和CFA生物合成的基因在细菌中不是组成型表达的。相反,当细菌在诱导培养基中生长时,这些基因在植物叶片表面或植物体内或/或体外诱导(Palmer和Bender,1993; Panchal等等,2016)。本文介绍了从Panchal等人改编的方法。 (2016),以确定细菌产生冠心病的能力,可用作毒性指征。

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