| In vitro Reconstitution Assays of Arabidopsis 20S Proteasome
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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 ...
[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） ...
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| Measurement of TACE Activity in Extracts from Cultured Cells
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Author:
Date:
2014-10-20
[Abstract] In cigarette smoke–induced and inflammation-associated lung cancer development, cigarette smoke extract (CSE) activates tumor necrosis factor-alpha (TNF-α) secretion from macrophages. TNF-α converting enzyme (TACE), also known as α-Secretase or ADAM17 (A Disintegrin and Metalloprotease), is a member of the ADAM family of metalloproteases. TACE mediated ectodomain shedding leads to the conversion of the inactive TNF-α precursor into the active mature pro-inflammatory cytokine. The SensoLyte 520 TACE (α-Secretase) Activity Assay Kit was used to detect TACE activity in CSE-activated macrophages. This assay is reliable, reproducible and easy to carry out in 96 well plate format.
[摘要] 在香烟烟雾诱导和炎症相关的肺癌发展中，香烟烟雾提取物（CSE）激活巨噬细胞的肿瘤坏死因子-α（TNF-α）分泌。 TNF-α转化酶（TACE），也称为α-分泌酶或ADAM17（解聚素和金属蛋白酶），是金属蛋白酶的ADAM家族的成员。 TACE介导的胞外结构域脱落导致无活性的TNF-α前体转化为活性成熟促炎细胞因子。 SensoLyte 520 TACE（α-分泌酶）活性测定试剂盒用于检测CSE活化的巨噬细胞中的TACE活性。 该测定法是可靠的，可重复的并且容易在96孔板形式中进行。
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