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Company: Thermo Fisher Scientific
Catalog#: BP359-212
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Quantification of Methylglyoxal Levels in Cowpea Leaves in Response to Cowpea Aphid Infestation
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Date:
2020-10-20
[Abstract]  Aphids are a serious pest of crops across the world. Aphids feed by inserting their flexible hypodermal needlelike mouthparts, or stylets, into their host plant tissues. They navigate their way to the phloem where they feed on its sap causing little mechanical damage to the plant. Additionally, while feeding, aphids secrete proteinaceous effectors in their saliva to alter plant metabolism and disrupt plant defenses to gain an advantage over the plant. Even with these arsenals to overcome plant responses, plants have evolved ways to detect and counter with defense responses to curtail aphid infestation. One of such response of cowpea to cowpea aphid infestation, is accumulation of the metabolite methylglyoxal. Methylglyoxal is an α,β-dicarbonyl ketoaldehyde that is toxic at high ... [摘要]  [摘要] 蚜虫是世界各地农作物的严重害虫。蚜虫通过将它们柔软的针状口器插入宿主植物组织中取食。它们会进入韧皮部,在那里吃韧皮部的汁液,对植物的机械损伤很小。此外,蚜虫在进食时,会在唾液中分泌蛋白质效应器来改变植物的新陈代谢,破坏植物的防御,从而获得对植物的优势。即使有了这些武器来克服植物的反应,植物也进化出了探测和反击的方式,以减少蚜虫的侵扰。豇豆蚜虫感染的这种反应之一是代谢物甲基乙二醛的积累。甲基乙二醛是一种对、对二羰基酮醛,在高浓度下有毒。在暴露于许多不同的非生物和生物胁迫后,甲基乙二醛水平略有上升,并已被证明在低水平上作为一种新兴的防御信号分子。在此,我们描述了一种在豇豆蚜虫感染后,利用高氯酸提取工艺在豇豆叶片中测量甲基乙二醛的方案。将提取的上清液用碳酸钾中和,丙酮醛与N-乙酰- l-半胱氨酸反应量化,生成N-乙酰- s -(1-羟基-2-oxo-prop-1-yl)半胱氨酸,并进行分光光度定量。

[背景] ...

Expression and Purification of Arabidopsis Transmembrane Protein BCM1 in Saccharomyces cerevisiae
Author:
Date:
2020-09-20
[Abstract]  Heterologous expression and purification of transmembrane proteins have remained a challenge for decades hampering detailed biochemical and structural characterization of key enzymes and their interacting regulators in multiple metabolic pathways. An in-depth study on the newly identified Arabidopsis thaliana integral membrane protein BALANCE OF CHLOROPHYLL METABOLISM 1 (BCM1) showed a stimulatory effect of the BCM1 on magnesium chelatase, the first enzyme of chlorophyll biosynthesis, through interaction with the GENOMES UNCOUPLED 4 (Wang et al., 2020). Here, we report a detailed and optimized method for heterologous expression and purification of His-tagged BCM1 in Saccharomyces cerevisiae. Following this method, we obtained native BCM1 used for in vitro ... [摘要]  [摘要 ] 异源表达和公顷跨膜蛋白的纯化VE 仍然几十年来阻碍了关键酶详述生物化学和结构表征一个挑战小号和它们的相互作用调节在多个代谢途径。上新鉴定进行了深入的研究拟南芥拟南芥叶绿素代谢1(BCM1)的整合膜蛋白BALANCE显示一个通过与相互作用对镁螯合,叶绿素生物合成的第一个酶,所述BCM1的刺激效应基因组中脱开4 (王等等人,2020)。这里 ,我们报告了酿酒酵母中His-tagged BCM1异源表达和纯化的详细和优化方法。˚F ollowing这种方法,我们获得用于本机BCM1 体外酶测定的镁螯合(王等人,2020) 。目前,BCM1的结晶研究正在进行中。这个协议可以适于纯化BCM 1一样从用于酶和结构研究真核生物的跨膜蛋白。

[背景 ] 鉴定翻译后单组的lators其指导LY 调制enzym 一个叶绿素合成的酶的抽动活动可以大大提高我们理解的分子机制,通过该植物保持高效叶绿素叶期间LL合成绿化(Brzezowski 等人,2015年)。然而,叶绿素合成酶及其相互作用蛋白的详细生化分析受到体外重组蛋白可用性的限制。我们最近发现一个叶绿素代谢1(BCM1)的翻译后调节平衡,同时刺激小号叶绿素合成和延迟叶绿素分解,日ERE 被授予叶发育过程中的叶绿素稳态(王等人,2020年)。为了检查BCM1对镁螯合酶(MgCh ...

In vitro Analysis of Ubiquitin-like Protein Modification in Archaea
Author:
Date:
2018-05-20
[Abstract]  The ubiquitin-like (Ubl) protein is widely distributed in Archaea and involved in many cellular pathways. A well-established method to reconstitute archaeal Ubl protein conjugation in vitro is important to better understand the process of archaeal Ubl protein modification. This protocol describes the in vitro reconstitution of Ubl protein modification and following analysis of this modification in Haloferax volcanii, a halophilic archaeon serving as the model organism. [摘要]  泛素样(Ubl)蛋白广泛分布于古细菌中并参与许多细胞途径。 为了更好地理解古细菌Ub1蛋白质修饰的过程,重建体外古细菌Ubl蛋白质缀合物的完善方法是很重要的。 该协议描述了Ubl蛋白质修饰的体外重建以及在作为模型生物的嗜盐古细菌Haloferax volcanii 中对这种修饰进行分析。

【背景】泛素(Ub)与靶蛋白共价连接的过程被称为泛素化,其控制真核细胞中大量的细胞过程(Glickman和Ciechanover,2002; Komander和Rape,2012)。遍在蛋白化由一系列酶(包括Ub激活酶(E1),Ub结合酶(E2s)和Ub连接酶(E3s))催化。泛素化的体外重建是确定酶之间或E3与蛋白质底物之间特异性的有用测定法(Zhao等人,2012)。在古细菌中,Ubl蛋白SAMP采用Ub折叠,并且与E1样酶UbaA催化的蛋白靶标异肽连接[Maupin-Furlow,(2014)综述]。尽管E1同系物在古细菌中广泛存在,但基于一级序列比较,在大多数古细菌中未预测经典E2或E3酶。我们最近对Haloferax volcanii的研究表明甲硫氨酸亚砜还原酶A(MsrA)是Ubl蛋白质修饰(sampylation)与UbaA一起在体内温和的氧化条件下和< (体外)(fu="">

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