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ALCOHOL, ETHYL FOR DNA AND RNA

Company: AmericanBio
Catalog#: AB00515
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Host-regulated Hepatitis B Virus Capsid Assembly in a Mammalian Cell-free System
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Date:
2018-04-20
[Abstract]  The hepatitis B virus (HBV) is an important global human pathogen and represents a major cause of hepatitis, liver cirrhosis and liver cancer. The HBV capsid is composed of multiple copies of a single viral protein, the capsid or core protein (HBc), plays multiple roles in the viral life cycle, and has emerged recently as a major target for developing antiviral therapies against HBV infection. Although several systems have been developed to study HBV capsid assembly, including heterologous overexpression systems like bacteria and insect cells, in vitro assembly using purified protein, and mammalian cell culture systems, the requirement for non-physiological concentrations of HBc and salts and the difficulty in manipulating host regulators of assembly presents major limitations ... [摘要]  乙型肝炎病毒(HBV)是一种重要的全球人类病原体,并且是肝炎,肝硬化和肝癌的主要原因。 HBV衣壳由单个病毒蛋白的多个拷贝组成,衣壳或核心蛋白(HBc)在病毒生命周期中起着多重作用,并且最近已经成为开发抗HBV病毒疗法的主要靶标。尽管已经开发了几种用于研究HBV衣壳组装的系统,包括异源过表达系统如细菌和昆虫细胞,使用纯化蛋白质和哺乳动物细胞培养系统进行体外组装,但对非生理浓度HBc和盐以及难以操纵装配的宿主调节物在生理相关条件下的衣壳装配的详细研究方面存在主要限制。我们最近开发了基于兔网织红细胞裂解物(RRL)的哺乳动物无细胞系统,其中HBc以生理浓度表达并在近生理条件下组装成衣壳。该系统已经揭示了HBc装配要求,这是以前装配系统所不能预料的。此外,该系统中的衣壳组装受可容易操作的内源宿主因子调控。在这里,我们提供了这种无细胞衣壳装配系统的详细协议,包括如何操纵调节装配的宿主因子的说明。

【背景】乙型肝炎病毒(HBV)是一种重要的全球人类病原体,其长期感染全世界数以亿计的人并且代表病毒性肝炎,肝硬化和肝癌的主要原因(Seeger等人, 2013; Trepo et。,2014)。 HBV通过逆转录RNA中间体(所谓的前基因组RNA(pgRNA))在核衣壳内(NC)复制其基因组DNA(一种宽松的环状部分双链DNA(RC ...

Dense sgRNA Library Construction Using a Molecular Chipper Approach
Author:
Date:
2017-06-20
[Abstract]  Genetic screens using single-guide-RNA (sgRNA) libraries and CRISPR technology have been powerful to identify genetic regulators for both coding and noncoding regions of the genome. Interrogating functional elements in noncoding regions requires sgRNA libraries that are densely covering, and ideally inexpensive, easy to implement and flexible for customization. We present a Molecular Chipper protocol for generating dense sgRNA libraries from genomic regions of interest. This approach utilizes a combination of random fragmentation and a Type III restriction enzyme to derive a dense coverage of sgRNA library from input DNA. [摘要]  使用单导向RNA(sgRNA)文库和CRISPR技术的遗传筛选功能强大可以识别基因组编码区和非编码区的遗传调控因子。 在非编码区域中询问功能元件需要密集覆盖的sgRNA文库,理想的便宜,易于实现和灵活定制。 我们提出了一个分子切片方案从感兴趣的基因组区域产生密集的sgRNA文库。 该方法利用随机断裂和III型限制酶的组合从输入DNA导出sgRNA文库的致密覆盖。
【背景】使用化脓性链球菌(sp)的基因组编辑Cas9和sgRNA文库是通过产生双重缺失功能序列改变来筛选哺乳动物细胞功能性遗传调节因子的有力工具(Wiedenheft et al。,2012; Mali et al。,2013; Koike-Yusa等,2014; Shalem等,2014; Wang等,2014; Zhou等,2014)。 Cas9结合sgRNA,其可被设计为将Cas9靶向基因组中定义的基因座。 Cas9的核酸酶活性切割靶DNA位点,导致双链DNA断裂,在通过非同源末端连接途径进行DNA修复时,经常导致感兴趣的基因座短缺失。
CRISPR-Cas9系统强大的基因组编辑能力导致使用sgRNA文库来询问蛋白质编码基因以及非编码区域。通过sgRNA富集功能筛选,报告了几种用于蛋白质编码基因和/或有限数量的非编码基因的sgRNA文库,以鉴定调控特定细胞功能的基因和网络(Koike-Yusa等,2014; ...

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