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Thermal Cycler

Company: Eppendorf
Catalog#: 950040025
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A Method for User-defined Mutagenesis by Integrating Oligo Pool Synthesis Technology with Nicking Mutagenesis
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2020-08-05
[Abstract]  Saturation mutagenesis is a fundamental enabling technology for protein engineering and epitope mapping. Nicking mutagenesis (NM) allows the user to rapidly construct libraries of all possible single mutations in a target protein sequence from plasmid DNA in a one-pot procedure. Briefly, one strand of the plasmid DNA is degraded using a nicking restriction endonuclease and exonuclease treatment. Mutagenic primers encoding the desired mutations are annealed to the resulting circular single-stranded DNA, extended with high-fidelity polymerase, and ligated into covalently closed circular DNA by Taq DNA ligase. The heteroduplex DNA is resolved by selective degradation of the template strand. The complementary strand is synthesized and ligated, resulting in a library of mutated ... [摘要]  [摘要] 饱和突变是蛋白质工程和表位定位的基础技术。缺口突变(NM)允许用户在一锅程序中快速构建目标蛋白序列中所有可能的单一突变的文库。简言之,质粒DNA的一条链被切痕限制性内切酶和核酸外切酶处理降解。编码所需突变的突变引物退火成环状单链DNA,用高保真聚合酶延伸,并通过taqdna连接酶连接成共价闭合的环状DNA。通过选择性降解模板链来分解异源双链DNA。合成并连接互补链,形成一个共价闭合的环状质粒库。后来的研究表明,由于该过程中使用的引物很少,因此通常在使用前需要扩增的再悬浮寡聚物池可以直接用于诱变过程。因为寡聚体可以包含数以万计的独特寡聚体,这使得在一个单罐突变反应中能够构建数以万计用户定义突变的库,这显著提高了NM的效用,如下所述。

寡聚物的使用为诱变实验提供了一种经济上有利的方法。首先,寡核苷酸池合成比传统合成便宜得多。第二,可以产生一个混合池,用于多个不同基因的诱变。为了使用同一个寡聚体进行多种基因的诱变,使用者只需量化特定于其诱变实验的寡聚体部分,并调整寡聚体的体积和有效浓度,以用于缺口突变。

[背景] 蛋白质功能序列相关性的评价对于蛋白质科学的应用和基础研究具有重要意义。近年来,深度突变扫描(DMS)已经上升到基于蛋白质的研究的前沿(Fowler and ...

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