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BioPhotometer plus, 230 V/50 – 60 Hz

BioPhotometer plus,230 V / 50-60 Hz

公司名称: Eppendorf
产品编号: BioPhotometerTM plus
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Substituted Cysteine Accessibility Method for Topology and Activity Studies of Membrane Enzymes Forming Thioester Acyl Intermediates in Bacteria
Author:
Date:
2015-11-05
[Abstract]  The topology of membrane proteins and enzymes can be determined using various methods including reporter protein fusions and accessibility of cysteine residues to alkylating agents. Here we describe a variation of the substituted cysteine accessibility method to determine membrane topology and activity of enzymes containing an active site cysteine. Membrane topology of proteins can be predicted using different programs and the actual membrane topology can be determined by monitoring the accessibility of cysteine residues introduced in periplasmic (exposed) or cytoplasmic (not exposed) loops ... [摘要]  膜蛋白和酶的拓扑学可以使用各种方法确定,包括报告蛋白融合和半胱氨酸残基对烷化剂的可达性。在这里,我们描述了取代的半胱氨酸可接近性方法的变化,以确定膜拓扑和含有活性位点半胱氨酸的酶的活性。可以使用不同的程序预测蛋白质的膜拓扑,并且可以通过监测在周质(暴露的)或细胞质(未暴露的)环中引入的半胱氨酸残基对烷化剂的可及性来确定实际的膜拓扑。描述了两步方案,其中首先用或不用膜不可渗透的硫醇试剂(2-磺酸基乙基) - 甲烷硫代磺酸盐处理整个大肠杆菌(大肠杆菌)细胞(MTSES)并随后用烷基化试剂马来酰亚胺聚乙二醇(malPEG)标记。当半胱氨酸残基可接近MTSES并且因此暴露于周质(或可从周质接近)时,它们的游离硫醇基团与MTSES共价反应,并因此被malPEG封闭以进行烷基化。胞质或膜嵌入的半胱氨酸残基的硫醇基团不能到达MTSES,并且蛋白质可以用malPEG烷基化,导致5kDa的分子量增加。在方案的第二部分中,半胱氨酸残基的可及性用于解决形成稳定的硫酯酰基中间体的酶的酰化状态。硫酯可以被中性羟胺特异性切割,导致活性位点半胱氨酸的游离巯基,然后可以用malPEG烷基化。

A Protocol to Measure the Extent of Cell-to-cell Movement of RNA Viruses in Planta
Author:
Date:
2014-10-20
[Abstract]  Here, we present a simple and rapid protocol to measure the extent of cell-to-cell movement of RNA viruses in planta. To do that, the green fluorescent protein (GFP) gene was incorporated into the genome of Melon necrotic spot virus (MNSV) as a coat protein (CP) fusion protein using the Thosea asigna virus 2A catalytic peptide (TaV 2a) (Serra-Soriano et al., 2014). TaV 2a allows the co-translational cleavage of the fusion protein resulting in the independent expression of both proteins (Kim et al., 2011). Viral infection was initiated by ... [摘要]  在这里,我们提出一个简单和快速的协议,以测量RNA病毒在植物中的细胞到细胞运动的程度。 为此,将绿色荧光蛋白(GFP)基因作为外壳蛋白(CP)融合蛋白掺入到Melon坏死斑病毒(MNSV)的基因组中,使用Sucha asigna病毒/Ta> 2A催化肽(TaV 2a)(Serra-Soriano等人,2014)。 TaV 2a允许融合蛋白的共翻译切割,导致两种蛋白的独立表达(Kim等人,2011)。 病毒感染通过对黄瓜叶的农杆菌浸润来启动。 在浸润后6-7天,用荧光立体显微镜拍摄荧光感染灶图像,并使用FIJI软件测量感染面积。

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