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NanoDropTM 2000 Spectrophotometer

Company: Thermo Fisher Scientific
Catalog#: NanoDropTM 2000
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High-throughput YO-PRO-1 Uptake Assay for P2X7 Receptors Expressed in HEK Cells
Author:
Date:
2018-07-20
[Abstract]  P2X7 receptors are extracellular ATP-gated ion channels that play broad physiological and pathological roles in animals (Sluyter, 2017). Activation of P2X7 receptors lead to the opening of membrane channels permeable for small cations like Na+ and Ca2+ as well as fluorescent dyes such as YO-PRO-1 (Alves et al., 2014). Taking advantage of this dye-permeability, YO-PRO-1 uptake assays have been widely used to probe P2X7 receptor activity (Surprenant et al., 1996; Rassendren et al., 1997; Karasawa et al., 2017). Here we describe a step by step protocol for a high-throughput YO-PRO-1 uptake assay using HEK293 cells expressing P2X7 receptors. This 3-day protocol is particularly suited for examining effects of small molecules and ... [摘要]  P2X7受体是细胞外ATP门控离子通道,在动物中发挥广泛的生理和病理作用(Sluyter,2017)。 P2X7受体的激活导致膜通道的开放可渗透小阳离子如Na + 和Ca 2 + 以及荧光染料如YO-PRO-1(Alves) et al。,2014)。 利用这种染料渗透性,YO-PRO-1摄取试验已被广泛用于探测P2X7受体活性(Surprenant et al。,1996; Rassendren et al。 ,1997; Karasawa et al。,2017)。 在这里,我们描述了使用表达P2X7受体的HEK293细胞进行高通量YO-PRO-1摄取测定的逐步方案。 这个为期3天的方案特别适用于检查小分子和突变对P2X7受体功能的影响。 该协议改编自我们之前发表的论文(Karasawa和Kawate,2016)。

【背景】P2X7受体打开可渗透阳离子的膜通道(Surprenant et al。,1996; Sluyter,2017)。虽然电生理学仍然是量化P2X7受体活性的金标准,但这种专门技术可能并不容易获得。此外,电生理学不适合高通量筛选,因为每次记录需要大量的时间和操作。因此,荧光分子的摄取是一种广泛使用的替代方法,特别是用于筛选多种条件/突变体(Cankurtaran-Sayar et al。,2009; Qu et al。 ...

Heterologous Expression and Purification of the CRISPR-Cas12a/Cpf1 Protein
Author:
Date:
2018-05-05
[Abstract]  This protocol provides step by step instructions (Figure 1) for heterologous expression of Francisella novicida Cas12a (previously known as Cpf1) in Escherichia coli. It additionally includes a protocol for high-purity purification and briefly describes how activity assays can be performed. These protocols can also be used for purification of other Cas12a homologs and the purified proteins can be used for subsequent genome editing experiments.


Figure 1. Timeline of activities for the heterologous expression and purification of Francisella novicida Cas12a (FnCas12a) from Escherichia coli
[摘要]  该协议提供了分步说明(图1),用于在大肠杆菌中异源表达新西兰弗朗西斯菌弗朗西丝菌Cas12a(以前称为Cpf1)。 它还包括一个高纯度纯化方案,并简要介绍如何进行活性测定。 这些方案也可以用于其他Cas12a同系物的纯化,并且纯化的蛋白质可以用于随后的基因组编辑实验。

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图1.从大肠杆菌 异源表达和纯化<弗朗西斯弗朗西丝菌 Cas12a(FnCas12a)的活动时间表

【背景】原核CRISPR-Cas免疫系统通过使用CRISPR RNA(crRNA)作为外源DNA或RNA的序列特异性靶向的指导来提供针对病毒和质粒的保护(van der Oost等人,2014; Marraffini ,2015)。 1类CRISPR-Cas系统(包含I型,III型和IV型)通常形成多亚基蛋白-cRNA效应复合物,而2类系统(包含II型,V型和VI型)依赖于单个crRNA-引导的效应物核酸酶用于目标干扰(Mohanraju et al。 2016年)。

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Immunoprecipitation of Tri-methylated Capped RNA
Author:
Date:
2018-02-05
[Abstract]  Cellular quiescence (also known as G0 arrest) is characterized by reduced DNA replication, increased autophagy, and increased expression of cyclin-dependent kinase p27Kip1. Quiescence is essential for wound healing, organ regeneration, and preventing neoplasia. Previous findings indicate that microRNAs (miRNAs) play an important role in regulating cellular quiescence. Our recent publication demonstrated the existence of an alternative miRNA biogenesis pathway in primary human foreskin fibroblast (HFF) cells during quiescence. Indeed, we have identified a group of pri-miRNAs (whose mature miRNAs were found induced during quiescence) modified with a 2,2,7-trimethylguanosine (TMG)-cap by the trimethylguanosine synthase 1 (TGS1) protein and transported to the cytoplasm ... [摘要]  蜂窝静止(因此已知为G <子> 0 骤停)是由降低的DNA复制,增加自噬表征,并且增加的细胞周期蛋白依赖性激酶p27蛋白上标kip1 表达。静止对伤口愈合,器官再生和瘤形成是必不可少的。先前的发现表明微小RNA(miRNA)在调节细胞静止过程中起重要作用。我们最近的出版物静止期间以实例阐述在原代人替代miRNA生物途径包皮成纤维(HFF)细胞的存在。实际上,我们已经发现了一组与由trimethylguanosine合酶1(TGS1)蛋白的2,2,7- trimethylguanosine(TMG)带肩改性PRI-的miRNA(其成熟miRNA发现静止期期间诱导的)的并运输到细胞质通过Exportin-1(XPO1)蛋白质。我们用来抗体针对(TMG)兴趣盖(不与第(m交叉反应 7 G)兴趣帽了大部分PRI-的miRNA或mRNA的含有[鲁曼等人的,1982]),以从增殖或静态HFFS的总RNA提取RNA进行免疫沉淀。该测定的新颖性是PRI-miRNA的以及含有一个TMG-帽修改以外的非编码RNA的特异性分离。


【背景】蜂窝静止,类型可逆生长停滞的,是在伤口愈合,器官再生,和预防瘤形成涉及一种重要的细胞状态(科勒,2011;瓦尔古等人 2012)。已发现小的非编码RNA如miRNA参与细胞静止的调节。 ...

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