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Brain Heart Infusion

Company: BD
Catalog#: 211060
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Expression and Purification of the Cas10-Csm Complex from Staphylococci
Author:
Date:
2017-06-05
[Abstract]  CRISPR-Cas (Clustered regularly interspaced short palindromic repeats-CRISPR-associated proteins) is a class of prokaryotic immune systems that degrade foreign nucleic acids in a sequence-specific manner. These systems rely upon ribonucleoprotein complexes composed of Cas nucleases and small CRISPR RNAs (crRNAs). Staphylococcus epidermidis and Staphylococcus aureus are bacterial residents on human skin that are also leading causes of antibiotic resistant infections (Lowy, 1998; National Nosocomial Infections Surveillance, 2004; Otto, 2009). Many staphylococci possess Type III-A CRISPR-Cas systems (Marraffini and Sontheimer, 2008; Cao et al., 2016), which have been shown to prevent plasmid transfer and protect against viral predators (Goldberg et al., ... [摘要]  CRISPR-Cas(聚集的定期间隔的短回文重复-CRISPR相关蛋白)是一类以序列特异性方式降解外来核酸的原核免疫系统。这些系统依赖于由Cas核酸酶和小型CRISPR RNA(crRNA)组成的核糖核蛋白复合物。表皮葡萄球菌和金黄色葡萄球菌是人皮肤上的细菌居民,也是抗生素抗性感染的主要原因(Lowy,1998; National Nosocomial Infection Surveillance,2004; Otto,2009) 。许多葡萄球菌具有III型A CRISPR-Cas系统(Marraffini和Sontheimer,2008; Cao等人,2016),已被证明可预防质粒转移并防止病毒性捕食者(Goldberg这些生物体中,等等,2014; Hatoum-Aslan等人,2014; Samai等人,2015)。因此,在天然葡萄球菌背景中获得对这些系统的机械理解可以导致对影响这些病原体的进化和存活的因素的重要见解。 III-A型CRISPR-Cas系统编码称为Cas10-Csm的五亚单位效应复合物(Hatoum-Aslan等人,2013)。在这里,我们描述了一种用于表达和纯化Cas10-Csm的方法。表皮样背景或异源性S。金黄色葡萄球菌背景。该方法由两步纯化方案组成,包括Ni 2 + - ...

Conjugation Assay for Testing CRISPR-Cas Anti-plasmid Immunity in Staphylococci
Author:
Date:
2017-05-05
[Abstract]  CRISPR-Cas is a prokaryotic adaptive immune system that prevents uptake of mobile genetic elements such as bacteriophages and plasmids. Plasmid transfer between bacteria is of particular clinical concern due to increasing amounts of antibiotic resistant pathogens found in humans as a result of transfer of resistance plasmids within and between species. Testing the ability of CRISPR-Cas systems to block plasmid transfer in various conditions or with CRISPR-Cas mutants provides key insights into the functionality and mechanisms of CRISPR-Cas as well as how antibiotic resistance spreads within bacterial communities. Here, we describe a method for quantifying the impact of CRISPR-Cas on the efficiency of plasmid transfer by conjugation. While this method is presented in Staphylococcus ... [摘要]  CRISPR-Cas是一种原核适应性免疫系统,可防止移植遗传因子如噬菌体和质粒的摄取。细菌之间的质粒转移是特别临床关注的,因为由于在物种内和物种之间转移抗性质粒而在人体中发现的抗生素抗性病原体的量增加。测试CRISPR-Cas系统在各种条件下或使用CRISPR-Cas突变体阻断质粒转移的能力,为CRISPR-Cas的功能和机制以及抗菌素抗性如何在细菌群落中传播提供了重要的见解。在这里,我们描述了一种量化CRISPR-Cas对通过共轭进行质粒转移效率的影响的方法。虽然这种方法在葡萄球菌属物种中呈现,但它可以更广泛地用于任何共轭原核生物。

背景 CRISPR-Cas(聚集的,定期间隔的,短的回文重复CRISPR相关联)是几乎90%的测序古菌和约40%的细菌中发现的原核适应性免疫系统(Makarova等人,2015) )。这些系统以序列特异性方式识别和破坏核酸侵入体(van der Oost等人,2014)。 CRISPR基因座通常包含短的DNA重复序列(长度为约35个核苷酸),其通过称为间隔区的等短的唯一序列分开,其通常来自移动遗传元件。重复序列和间隔区被转录并处理成小的CRISPR RNA(crRNA),每个指定单个靶标。 ...

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