| Exit from Pluripotency Assay of Mouse Embryonic Stem Cells
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Author:
Date:
2017-08-20
[Abstract] A novel method to assess the dissolution of the core pluripotency transcription-factor circuit of mouse Embryonic Stem Cells (mESCs) has been developed (Ying et al., 2003; Betschinger et al., 2013). In order to efficiently identify genes essential for the break-down of the pluripotency network in mutant mESCs with proliferation defects, we adapted this ‘exit from pluripotency assay’ (Bodak et al., 2017; Cirera-Salinas et al., 2017). The protocol described here has been successfully applied to several mESC lines and is easily transposable from one laboratory to another.
[摘要] 已经开发了评估小鼠胚胎干细胞（mESCs）的核心多能转录因子电路溶解的新方法（Ying等，2003; Betschinger等，2013）。 为了有效识别具有增殖缺陷的突变体mESCs中多能网络分解所必需的基因，我们调整了这种“多能性测定法”（Bodak等，2017; Cirera-Salinas等，2017）。 这里描述的方案已经成功应用于几个mESC系列，并且可以容易地从一个实验室转座到另一个实验室。
【背景】几十年来，科学家已经尝试确定基因与一般（例如胚胎体）或定向（例如，神经元前体细胞）分化方案的mESCs的分化潜能的机制。最近，发现2i培养基允许在体外俘获天真的干细胞（Ying et al。，2008）。 ...
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| Isolation of Ribosomal Particles from the Unicellular Cyanobacterium Synechocystis sp. PCC 6803
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Author:
Date:
2017-03-20
[Abstract] Isolation of ribosomal particles is an essential step in the study of ribosomal components as well as in the analysis of trans-acting factors that interact with the ribosome to regulate protein synthesis and modulate the expression profile of the cell in response to different environmental conditions. In this protocol, we describe a procedure for the isolation of 70S ribosomes from the unicellular cyanobacterium Synechocystis sp. PCC 6803 (hereafter Synechocystis). We have successfully used this protocol in our study of the cyanobacterial ribosomal-associated protein LrtA, which is a homologue of bacterial HPF (hibernation promoting factor) (Galmozzi et al., 2016).
[摘要] 核糖体颗粒的分离是研究核糖体组分以及与核糖体相互作用以调节蛋白质合成并调节细胞表达谱的反式因子的分析中必不可少的步骤响应不同的环境条件。在本协议中，我们描述了从单细胞蓝细菌集胞藻分离70S核糖体的过程。 PCC 6803（以下简称集胞藻）。我们已经成功地使用这个方案来研究蓝细菌核糖体相关蛋白LrtA，它是细菌HPF（冬眠促进因子）的同系物（Galmozzi等人，2016）。
背景 据报道蓝藻核糖体几乎没有生物化学研究。已经通过差速离心分离70S核糖体颗粒，然后通过二维电泳分析核糖体蛋白质（Sato et al。，et al。 ，1998）。核糖体也已经从聚球藻（Spechococcus）进行制备。 PCC 6301细胞使用组合差速离心和蔗糖步骤梯度的方案（Sugita等人，2000）。通过差速离心分离细胞提取物也被用于制备核糖体样品用于在不同的聚球藻菌株中开发体外翻译系统（Mutsuda和Sugiura，2006 ）。基于针对聚球藻（Sugita等人，2000）所述的方法，本文所述的针对集胞藻的方法允许使用以下方式纯化核糖体颗粒线性蔗糖梯度的超速离心。
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| Extraction and Analysis of Carotenoids from Escherichia coli in Color Complementation Assays
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Author:
Date:
2017-03-20
[Abstract] A common method to investigate the function of genes putatively involved in carotenoid biosynthesis is the so called color complementation assay in Escherichia coli (see, e.g., Cunningham and Gantt, 2007). In this assay, the gene under investigation is expressed in E. coli strains genetically engineered to synthesize potential carotenoid substrates, followed by analysis of the pigment changes in the carotenogenic bacteria via high-performance liquid chromatography (HPLC). Two crucial steps in this method are (i) the quantitative extraction of the carotenoids out of E. coli and (ii) the reproducible and complete separation of the pigments by HPLC.
Here, we present a protocol for the extraction and analysis of carotenoids with a broad range of ...
[摘要] 调查涉及类胡萝卜素生物合成的基因的功能的常见方法是在大肠杆菌中所谓的颜色互补测定（参见，例如，Cunningham和Gantt，2007） 。在该测定中，所研究的基因在E中表达。基因工程改造以合成潜在的类胡萝卜素底物，然后通过高效液相色谱（HPLC）分析色素变性细菌。该方法的两个关键步骤是（i）从E中定量提取类胡萝卜素。大肠杆菌和（ii）通过HPLC重现和完全分离颜料。
＆nbsp;在这里，我们提出了一种从胡萝卜素E提取和分析具有广泛极性的类胡萝卜素的方案。大肠杆菌。用于提取的溶剂混合物在溶液中保持亲脂性胡萝卜素和更极性的叶黄素，并且与随后的HPLC分析的洗脱液梯度相容。所用的C30柱特别适于分离类胡萝卜素的各种顺式异构体，而且用于分离立体异构体如α-和β-胡萝卜素或叶黄素和玉米黄质。
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