| In situ Hybridization (ISH) in Preparasitic and Parasitic Stages of the Plant-parasitic Nematode Meloidogyne spp.
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Author:
Date:
2018-03-20
[Abstract] The spatio-temporal expression pattern of a gene provides important indications to better understand its biological function. In situ hybridization (ISH) uses a labeled complementary single-stranded RNA or DNA probe to localize gene transcripts in a whole organism, a whole organ or a section of tissue. We adapted the ISH technique to the plant parasite Meloidogyne spp. (root-knot nematode) to visualize RNAs both in free-living preparasitic juveniles and in parasitic stages settled in the plant tissues. We describe each step of the probe synthesis, digoxigenin (DIG) labeling, nematode extraction from plant tissue, and ISH procedure.
[摘要] 基因的时空表达模式为更好地理解其生物学功能提供了重要的指示。 原位杂交（ISH）使用标记的互补单链RNA或DNA探针来定位整个生物体，整个器官或一部分组织中的基因转录物。 我们将ISH技术应用于植物寄生虫
【背景】到目前为止，植物寄生性线虫的稳定转化尚未成功。 ISH能够在整个装载的Meloidogyne spp中分析体内时空基因表达。线虫。这些根结线虫在土壤中以微小蚓状幼虫（J2）形式孵化并感染宿主植物根部。 J2s穿透根部并迁移到根部维管柱状细胞。幼虫定居在根部，发育成J3和J4寄生幼鱼，诱导分化专化饲养细胞。线虫最终发育成梨形雌性，将在根表面释放数百个卵。在这里，我们报告了一个详细的协议来检测准备性整体安装J2s和寄生阶段中的单个RNA分子。寄生虫阶段的ISH需要在感染根部提取线虫前一天采取额外的程序。我们描述了在线虫整个组织中使用地高辛（DIG）标记的cDNA探针检测转录物。
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| RNA-protein UV-crosslinking Assay
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Author:
Date:
2017-03-20
[Abstract] RNA-protein interactions play a crucial role in every aspect of RNA metabolism, and also plays a major role in post-transcriptional gene regulation. RNA-binding proteins have been implicated in viral gene expression (Ray and Das, 2002) and microRNA-mediated gene regulation (Poria et al., 2016). Here we have described the protocol which (1) covalently links transiently interacting RNA-protein complexes by UV crosslinking, (2) removes the unprotected RNA by RNase digestion and (3) detects the RNA-protein complexes by SDS-PAGE analysis. This protocol provides a rapid and reliable means to directly assay RNA-protein interactions and their kinetics using purified proteins and also help in identifying novel RNA-protein interactions
[摘要] RNA-蛋白质的相互作用在RNA代谢的各个方面发挥着至关重要的作用，并且在转录后基因调控中起重要作用。 RNA结合蛋白涉及病毒基因表达（Ray和Das，2002）和微小RNA介导的基因调控（Poria等人，2016）。这里我们描述了（1）通过紫外线交联共价连接瞬时相互作用的RNA蛋白复合物的方案，（2）通过RNA酶消化去除未保护的RNA，（3）通过SDS-PAGE分析检测RNA-蛋白复合物。该方案提供了一种快速可靠的手段来直接测定RNA-蛋白质相互作用及其使用纯化蛋白质的动力学，也有助于鉴定新的RNA-蛋白质相互作用
背景 RNA-蛋白质相互作用由瞬时非共价相互作用介导，例如RNA和蛋白质分子中特异残基之间的静电相互作用和氢键。短波UV辐射可以诱导两个紧密放置的芳环之间的共价键形成。在蛋白质和核酸的含氮碱基中的几个氨基酸中发现芳环结构。因此，使用紫外线照射共价连接RNA和相互作用的蛋白质，从而可以通过SDS-聚丙烯酰胺凝胶电泳进一步分析RNA蛋白复合物。该协议描述了一种简单快速的测定系统，可以在体外测定RNA-蛋白质相互作用及其结合动力学。此外，通过该方法获得的荧光标记的RNA-蛋白复合物的质谱分析可以导致新型RNA-蛋白质相互作用的鉴定。
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| RNA-Affinity Chromatography
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Author:
Date:
2013-07-05
[Abstract] RNA-affinity chromatography assays are used to identify proteins binding specific RNA sequences. These proteins represent potential factors contributing to the function of RNA molecules. In our lab, we have used this protocol to identify proteins binding sequence motifs involved in replication and transcription of positive strand RNA viruses. The assay described in this protocol consists on the immobilization of 5’-biotinylated RNA oligonucleotides (30-40 nt) on a streptavidin-conjugated, paramagnetic solid matrix. Then, cytoplasmic protein extracts pre-cleared on the solid matrix to decrease nonspecific binding, were incubated with the immobilized RNA molecules in the presence of a nonspecific competitor. RNA-protein complexes immobilized on the paramagnetic solid matrix were isolated ...
[摘要] RNA亲和层析分析用于鉴定结合特异性RNA序列的蛋白质。 这些蛋白质代表有助于RNA分子功能的潜在因素。 在我们的实验室，我们使用这个方案来鉴定参与正链RNA病毒复制和转录的蛋白质结合序列基序。 该方案中描述的测定法包括将5'-生物素化的RNA寡核苷酸（30-40nt）固定在链霉抗生物素蛋白缀合的顺磁性固体基质上。 然后，在固体基质上预先清除的细胞质蛋白质提取物以降低非特异性结合，在非特异性竞争剂存在下与固定的RNA分子一起温育。 使用磁铁分离固定在顺磁性固体基质上的RNA-蛋白复合物，并通过聚丙烯酰胺凝胶电泳分离结合蛋白进行蛋白质组学分析。
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