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Author:
Date:
2021-02-20
[Abstract] Precise genome engineering has become a commonplace technique for metabolic engineering. Also, insertion, deletion and alteration of genes and other functional DNA sequences are essential for understanding and engineering cells. Several techniques have been developed to this end (e.g., CRISPR/Cas-assisted methods, homologous recombination, or λ Red recombineering), yet most of them rely on the use of auxiliary plasmids, which have to be cured after the editing procedure. Temperature-sensitive replicons, counter-selectable markers or repeated passaging of plasmid-bearing cells have been traditionally employed to circumvent this hurdle. While these protocols work reasonably well in some bacteria, they are not applicable for other species or are time consuming and laborious. Here, we present ...
[摘要] [摘要]精确的基因组工程已成为代谢工程的一种普遍技术。同样，基因和其他功能性DNA序列的插入，缺失和改变对于理解和改造细胞也是必不可少的。几种技术已经发展到该端部（例如，CRISPR / CAS-辅助方法，同源重组，或 λ 红色重组），但其中大多数依赖于辅助质粒的使用，必须在编辑程序后将其固化。传统上已采用对温度敏感的复制子，反向选择标记或带有质粒的细胞的重复传代来规避这一障碍。尽管这些协议在某些细菌中可以很好地发挥作用，但它们不适用于其他物种，或者既费时又费力。在这里，我们提出了快速和通用的荧光假单胞菌荧光标记辅助基因组编辑协议，然后通过用户控制的质粒复制干净固化辅助质粒。一种荧光标记有助于鉴定基因组编辑的菌落，而第二种报道分子能够检测无质粒的细菌克隆。该协议不仅是用于假单胞菌物种的最快方法，而且可以轻松地适应任何类型的基因组修饰，包括序列删除，插入和替换。
图形概要：
带有可治愈质粒的假单胞菌的快速基因组工程
[背景]靶向，精确的基因组操纵技术已经大大推进了微生物工程领域。这样的方法不仅允许评估基因型与表型的关系，而且使微生物细胞工厂的复杂工程化成为可能。近年来，CRISPR / Cas9方法为真核生物的精确基因组工程铺平了道路。在细菌中，CRISPR / ...
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Author:
Date:
2020-06-20
[Abstract] Transfer RNAs (tRNAs) are heavily decorated with post-transcriptional modifications during their biosynthesis. To fulfil their functions within cells, tRNAs undergo a tightly controlled biogenesis process leading to the formation of mature tRNAs. In addition, functions of tRNAs are often modulated by their modifications. Although the biological importance of post-transcriptional RNA modifications is widely appreciated, methods to directly detect their introduction during RNA biosynthesis are rare and do not easily provide information on the temporal nature of events. To obtain information on the tRNA maturation process, we have developed a methodology, using NMR as a tool to monitor tRNA maturation in a non-disruptive and continuous fashion in cellular extracts. By following the ...
[摘要] [摘要 ] 转移RNA（tRNA ）在其生物合成过程中大量修饰有转录后修饰。为了在细胞内履行其功能，tRNA 经历了严格控制的生物生成过程，导致了成熟的tRNA 的形成。此外，tRNA的功能通常是虽然转录后修饰RNA的生物学重要性被广泛理解，方法直接检测它们的RNA生物合成过程中引入是罕见的，并且不容易提供上events.To的时间特性信息获取的信息的tRNA 成熟 在此过程中，我们开发了一种方法，使用NMR作为监测细胞提取物中tRNA 成熟的无中断和连续方式。通过模型酵母tRNA 的时间分辨NMR 成熟，我们发现修饰是该方法的实施需要对具有不同修饰状态的tRNA 样品进行NMR光谱学分析，以鉴定各个修饰的NMR特征。此处将介绍用于NMR光谱分析修饰途径的tRNA 样品的生产，并在酵母tRNA Phe 上进行例证，但可以通过更改构建体的序列扩展到其他tRNA 。该方案描述了未修饰的生产通过体外转录获得tRNA 样品，并通过在大肠杆菌中重组表达tRNA 产生修饰的tRNA 样品。大肠杆菌。
[背景 ] 在生活的各个领域，合成和RNA的成熟包括在特定地点的核苷酸的转录后的化学修饰。在不同的RNA家族，tRNA基因不仅显示最高多种化学修饰，而且密度最高每转录修饰（〜中经修饰的核苷酸8-25％的tRNA 各种生物体的）（Boccaletto ...
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