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BactoTM Agar

Company: BD Biosciences
Catalog#: 214030
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Dual sgRNA-based Targeted Deletion of Large Genomic Regions and Isolation of Heritable Cas9-free Mutants in Arabidopsis
Author:
Date:
2020-10-20
[Abstract]  CRISPR/Cas9 system directed by a gene-specific single guide RNA (sgRNA) is an effective tool for genome editing such as deletions of few bases in coding genes. However, targeted deletion of larger regions generate loss-of-function alleles that offer a straightforward starting point for functional dissections of genomic loci. We present an easy-to-use strategy including a fast cloning dual-sgRNA vector linked to efficient isolation of heritable Cas9-free genomic deletions to rapidly and cost-effectively generate a targeted heritable genome deletion. This step-by-step protocol includes gRNA design, cloning strategy and mutation detection for Arabidopsis and may be adapted for other plant species. [摘要]  [摘要] CRISPR/Cas9由基因特异性单导RNA(sgRNA)引导的系统是一种有效的基因组编辑工具,如编码基因中少部分碱基的删除。然而,大区域的靶向缺失产生功能缺失等位基因,这为基因组基因座的功能解剖提供了一个直接的起点。我们提出了一个简单易用的策略,包括一个快速克隆双sgRNA载体,有效分离可遗传的Cas9游离基因组缺失,以快速且经济有效地产生靶向遗传基因组缺失。该方法包括拟南芥的gRNA设计、克隆策略和突变检测,可适用于其他植物。

[背景] ...

Affinity Purification of GO-Matryoshka Biosensors from E. coli for Quantitative Ratiometric Fluorescence Analyses
Author:
Date:
2020-10-05
[Abstract]  Genetically encoded biosensors are powerful tools for quantitative visualization of ions and metabolites in vivo. Design and optimization of such biosensors typically require analyses of large numbers of variants. Sensor properties determined in vitro such as substrate specificity, affinity, response range, dynamic range, and signal-to-noise ratio are important for evaluating in vivo data. This protocol provides a robust methodology for in vitro binding assays of newly designed sensors. Here we present a detailed protocol for purification and in vitro characterization of genetically encoded sensors, exemplified for the His affinity-tagged GO-(Green-Orange) MatryoshCaMP6s calcium sensor. GO-Matryoshka sensors are based on single-step insertion ... [摘要]  [摘要]遗传编码的生物传感器是强大的工具为离子和代谢物的定量可视化在体内。设计和优化此类生物传感器通常需要分析大量变体。体外确定的传感器特性,例如底物特异性,亲和力,响应范围,动态范围和信噪比,对于评估体内数据很重要。该协议为新设计的传感器的体外结合测定提供了可靠的方法。这里我们提出了一个详细的协议用于纯化和体外表征的遗传编码的传感器,例示的His亲和标记的GO-(绿橙色)MatryoshCaMP6s钙传感器。GO-Matryoshka传感器基于在感兴趣的结合蛋白内一步插入一个包含两个嵌套荧光蛋白,圆形排列的荧光绿色FP(cpGFP )和Large Stoke Shift LSSmOrange的盒的方法,从而产生了利用被分析物触发的比例式传感器cpGFP的荧光变化。


[背景技术]将绿色荧光蛋白(GFP)在1962年被鉴定在水母水母维多利亚(下村等人,1962) 。30年后,描述了其首次用作报道基因(Chalfie等,1994)。自从发现以来,GFP变体和其他荧光蛋白为生物科学的主要进步做出了巨大贡献,并且现在已成为生物医学研究中的常用工具(Frommer等,2009)。

各种荧光蛋白(FP)和FP变异体已被用作报道分子或与所有生命王国的生物体中的蛋白融合(Chudakov等,2010 ;Valeur和Berberan- ...

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