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Yeast extract

酵母抽提物

Company: BD
Catalog#: 212750
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A SsrA/NIa-based Strategy for Post-Translational Regulation of Protein Levels in Gram-negative Bacteria
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Date:
2020-07-20
[Abstract]  Strategies to control the levels of key enzymes of bacterial metabolism are commonly based on the manipulation of gene of interest within the target pathway. The development of new protocols towards the manipulation of biochemical processes is still a major challenge in the field of metabolic engineering. On this background, the FENIX (functional engineering of SsrA/NIa-based flux control) system allows for the post-translational regulation of protein levels, providing both independent control of the steady-state protein amounts and inducible accumulation of target proteins. This strategy enables an extra layer of control over metabolic fluxes in bacterial cell factories (see Graphical abstract below). The protocol detailed here describes the steps needed to design FENIX-tagged ... [摘要]  [摘要 ] 控制细菌代谢关键酶水平的策略通常基于目标途径内目标基因的操纵。朝着生化过程的操纵发展新协议仍然是代谢工程领域的主要挑战。在此背景下,FENIX(基于SsrA / NIa的流量控制功能工程)系统可进行蛋白质水平的翻译后调节,既提供对稳态蛋白质量的独立控制,又可诱导焦油获得蛋白质的积累。这一战略ENABL 上课了代谢流和细菌细胞工厂控制的一个额外层(见图形抽象下文)。此处详细介绍的协议描述了设计FENIX标签的蛋白质并使系统适应几乎所有代谢通量微调途径的步骤。



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[背景 ] 控制蛋白质生产已成为已被一个具有挑战性的问题主要是解决由操纵它的生产的不同层次的调节,如所产生的DNA水平或蛋白质的(一个或多个)的量(吴等人,2016 ; Avcilar- Kucukgoze 等人,2017)。在DNA方面,已经在几种微生物中广泛研究了转录和翻译,从而能够设计和开发大量合成电路以改善生物生产过程(Guzmán 等,1995 ; Lutz 和Bujard ,1997)。相比之下,对蛋白质水平的研究较少,主要基于RNA干扰,核糖调节剂和特定的转录调节子(Isaacs ...

Generation and in Planta Functional Analysis of Potato Virus Y mutants
Author:
Date:
2020-07-20
[Abstract]  Potato virus Y (PVY), the type member of the genus Potyvirus (family Potyviridae), is the most widespread virus affecting potato and is included in the top five most economically detrimental plant viruses. Recently, the structure of the PVY virion has been determined by cryo-electron microscopy, which has opened the doors to functional studies that explore the involvement of selected amino acids in different stages of the viral cycle. The only way to functionally challenge in planta the role of particular amino acids in the coat protein of PVY, or in other viral proteins, is by using cDNA clones. The use and manipulation of PVY cDNA clones, unlike those of other potyviruses, has been traditionally impaired by the toxicity that certain sequences within the PVY ... [摘要]   [摘要] 马铃薯Y病毒(PVY)是马铃薯Y病毒属(Potyvirus,Potyvirus,Potyvirus科)的模式成员,是危害马铃薯最广泛的病毒之一,被列为最具经济危害性的五大植物病毒之一。最近,低温电子显微镜技术已经确定了PVY病毒离子的结构,这为功能性研究打开了大门,可以探索在病毒周期的不同阶段中所选择的氨基酸的参与。唯一能在植物体内挑战PVY外壳蛋白或其它病毒蛋白中特定氨基酸的作用的方法是使用cDNA克隆。与其他马铃薯Y病毒不同,PVY cDNA克隆的使用和操作一直受到PVY基因组中某些序列对大肠杆菌的毒性的影响。在这里,我们描述了一个已发表的PVY cDNA克隆,它含有克服上述毒性的内含子,以探索不同外壳蛋白修饰对病毒感染的影响。该方案包括在大肠杆菌中操作cDNA克隆,用构建的克隆对植物进行生物接种,观察对植物的生物学效应,通过逆转录定量PCR对cDNA克隆进行定量,并通过透射电镜证实病毒离子的形成。未来的可能性包括使用荧光蛋白报告者标记的PVY cDNA克隆,以进一步深入了解外壳蛋白突变对PVY病毒离子细胞间运动的影响。

[背景] ...

Conjugation Protocol Optimised for Roseburia inulinivorans and Eubacterium rectale
Author:
Date:
2020-04-05
[Abstract]  Roseburia and Eubacterium species of the human gut microbiota play an important role in the maintaince of human health, partly by producing butyrate, the main energy source of our colonic epithelial cells. However, our knowledge of the biochemistry and physiology of these bacteria has been limited by a lack of genetic manipulation techniques. Conjugative transposons previously introduced into Roseburia species could not be easily modified, greatly limiting their applicability as genetic modification platforms. Modular plasmid shuttle vectors have previously been developed for Clostridium species, which share a taxonomic order with Roseburia and Eubacterium, raising the possibility that these vectors could be used in these organisms. ... [摘要]  [摘要 ] 人体肠道菌群中的玫瑰菌属和真细菌属在维持人类健康中起着重要作用,部分原因是产生丁酸盐,这是我们结肠上皮细胞的主要能源。但是,由于缺乏基因操作技术,我们对这些细菌的生物化学和生理学的认识受到限制。先前引入玫瑰花属物种的共轭转座子不容易被修饰,极大地限制了它们作为基因修饰平台的适用性。MOD ular质粒穿梭载体先前已经开发了用于梭菌物种,其与共享一个分类次序ř oseburia 和真杆菌,提高这些矢量可以在这些生物体中使用的可能性。在这里,我们描述了一种优化缀合协议使得能够自主复制的质粒的从转印大肠杆菌供体菌株为罗斯氏inulinivorans 和真杆菌rectale 。质粒的模块性质及其通过自主复制在受体细菌中得以维持的能力使其成为研究异源基因表达的理想之选,并成为其他遗传工具(包括反义RNA沉默或II 型移动子中断子基因破坏策略)的平台。

[背景 ] 玫瑰菌和真细菌属人类肠道菌群中含量最高的细菌(Zhernakova 等,2016),它们通过利用饮食和宿主衍生的多糖影响人类健康(Scott 等,2006和2011; Cockburn 等) 。,2015 ; 谢里登等人,2016 )并产生促进健康的代谢物丁酸作为发酵终产物(邓肯等人,2002和2006) 。另外,这些物种能够通过鞭毛调节宿主免疫(Neville ...

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