| Delivery of the Cas9 or TevCas9 System into Phaeodactylum tricornutum via Conjugation of Plasmids from a Bacterial Donor
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Author:
Date:
2018-08-20
[Abstract] Diatoms are an ecologically important group of eukaryotic microalgae with properties that make them attractive for biotechnological applications such as biofuels, foods, cosmetics and pharmaceuticals. Phaeodactylum tricornutum is a model diatom with defined culture conditions, but routine genetic manipulations are hindered by a lack of simple and robust genetic tools. One obstacle to efficient engineering of P. tricornutum is that the current selection methods for P. tricornutum transformants depend on the use of a limited number of antibiotic resistance genes. An alternative and more cost-effective selection method would be to generate auxotrophic strains of P. tricornutum by knocking out key genes involved in amino acid biosynthesis, and using ...
[摘要] 硅藻是一种具有重要生态意义的真核微藻类，其特性使其对生物燃料，食品，化妆品和药品等生物技术应用具有吸引力。 Phaeodactylum tricornutum 是具有确定培养条件的模型硅藻，但缺乏简单而强大的遗传工具阻碍了常规遗传操作。有效设计 P的一个障碍。 tricornutum 是 P的当前选择方法。 tricornutum 转化体依赖于使用有限数量的抗生素抗性基因。另一种更具成本效益的选择方法是产生 P的营养缺陷型菌株。通过敲除参与氨基酸生物合成的关键基因，并使用基于质粒的生物合成基因拷贝作为选择标记，使三角酵母。以前关于 P基因敲除的研究。 tricornutum 使用biolistic转换将CRISPR-Cas9系统传递到 P.藻。非复制质粒的生物射弹转化可导致对 P的不期望的损伤。由于转化的DNA随机整合到基因组中，tricornutum 。随后固化编辑的细胞以防止Cas9的长期过表达是非常困难的，因为目前没有方法来切除整合的质粒。该协议采用新方法将Cas9或TevCas9系统传送到 P. tricornutum 通过来自细菌供体细胞的质粒的缀合。该过程涉及：1）设计和插入靶向 P的guideRNA。将tricornutum 尿素酶基因导入TevCas9表达质粒，该质粒也编码转移的接合起点，2）将该质粒安装在含有含有接合机制的质粒（pTA-Mob）的大肠杆菌中， ...
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| Expression and Purification of Cyanobacterial Circadian Clock Protein KaiC and Determination of Its Auto-phosphatase Activity
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Author:
Date:
2017-02-20
[Abstract] Circadian rhythms are biological processes displaying an endogenous oscillation with a period of ~24 h. They allow organisms to anticipate and get prepared for the environmental changes caused mainly by the rotation of Earth. Circadian rhythms are driven by circadian clocks that consist of proteins, DNA, and/or RNA. Circadian clocks of cyanobacteria are the simplest and one of the best studied models. They contain the three clock proteins KaiA, KaiB, and KaiC which can be used for in vitro reconstitution experiments and determination of the auto-phosphatase activity of KaiC as described in this protocol.
[摘要] 昼夜节律是显示内源性振荡的生物过程，周期为〜24小时。它们允许生物体预期并准备好主要由地球旋转引起的环境变化。昼夜节律由由蛋白质，DNA和/或RNA组成的昼夜节律钟驱动。蓝藻的昼夜节律时钟是最简单的研究模型之一。它们含有三种时钟蛋白质KaiA，KaiB和KaiC，其可用于体外重组实验和本方案所述的KaiC的自磷酸酶活性的测定。
背景 行星地球的旋转导致〜24小时的昼夜振荡。为了适应并有效地利用环境的这种节奏变化，大多数（如果不是全部）生物体具有约24小时的内源性活动节律，这被称为昼夜节律。昼夜节律为这些生物提供进化优势。昼夜节律的长期破坏是非常有害的（Ma et al。，2013）。在人类中，包括癌症，高血压和睡眠障碍在内的许多疾病与昼夜节律紊乱密切相关（Shi等人，2013; Roenneberg和Merrow，2016）。
＆nbsp;昼夜节律由称为昼夜节律钟的内生节律发生器控制。功能性昼夜节律钟具有三个功能：接受环境信息，将环境提示转变为振荡信号，并将这些信号转发到下游调制器（Pattanayak和Rust，2014）。蓝细菌是具有良好研究的昼夜节律钟的最简单的生物体，其中振荡发生器由三种蛋白质控制：KaiA，KaiB和KaiC（Mackey等人，2011; Johnson＆amp; et al。 ...
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| Immunoprecipitation of Proteins in Caenorhabditis elegans
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Author:
Date:
2015-04-05
[Abstract] Immunoprecipitation (IP) is a biochemical technique to precipitate a protein out of solution using an antigen that can specifically bind to that protein. IP can be performed to isolate and concentrate one particular protein from a sample of thousands of different proteins. IP is also readily performed to pull down interacting proteins of complexes out of solution. This protocol outlines the methods used to IP proteins in whole worm lysates and their preparation for detection on Western blots using denaturing conditions.
[摘要] 免疫沉淀（IP）是使用可以特异性结合该蛋白质的抗原将蛋白质从溶液中沉淀出来的生物化学技术。 IP可以从数千种不同蛋白质的样品中分离和浓缩一种特定蛋白质。 IP也容易进行以从溶液中取出复合物的相互作用蛋白。 该协议概述了用于IP蛋白在整个蠕虫裂解物中的方法及其用于使用变性条件在蛋白质印迹上检测的方法。
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