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Company: Amaresco
Catalog#: 0497
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An Optimized CTAB Method for Genomic DNA Extraction from Freshly-picked Pinnae of Fern, Adiantum capillus-veneris L.
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Date:
2018-07-05
[Abstract]  As the sister clade of seed plants, ferns are significant materials for plant phylogeny research. However, the genomic DNA extraction protocol for fern samples like modified CTAB method still lacks robustness. Here, we found that the amount and condition of the pinnae samples are critical for gDNA extraction in fern, Adiantum capillus-veneris L. In 500 μl CTAB solution, the recommended amount of pinnae is about 10-20 mg (2-3 pieces). The condition of the pinnae must be instantly-picked from a plant cultivated in a suitable environment. With these factors under control, it is highly reproducible to get the high-quality gDNA with low degradation rate [摘要]  作为种子植物的姐妹分支,蕨类植物是植物系统发育研究的重要材料。 然而,像改良CTAB方法的蕨类样品的基因组DNA提取方案仍然缺乏稳健性。 在这里,我们发现羽片样品的数量和条件对于蕨类植物, Adiantum capillus-veneris L中的gDNA提取至关重要。在500μlCTAB溶液中,推荐的羽片量约为10-20 mg(2-3片)。 必须从在合适环境中栽培的植物中立即采摘羽片的状况。 在控制这些因素的情况下,获得具有低降解率的高质量gDNA具有高度可重复性

【背景】CTAB方法已应用于 Adiantum capillus-veneris L的gDNA提取(Han et al 。,2012; Li et al 。,2017年)。 然而,该方案在我们的实验中仍显示出不稳定性和高降解率。 蕨类植物的羽片积聚了大量的次级代谢产物,如多糖和多酚,这对DNA提取不利(Ponnusamy et al。,2015)。

为了提高gDNA提取的稳健性,我们基本上从两个方面对协议进行了优化:1)减少材料用量,仅使用2-3个羽片(约10-20毫克)。 2)必须从在适宜的培养环境(温度:25℃,湿度:65%,16小时白光/ 8小时黑暗处理)中培养的植物中新鲜采摘羽片,并立即用于DNA提取。 ...

RNA Cap Methyltransferase Activity Assay
Author:
Date:
2018-03-20
[Abstract]  Methyltransferases that methylate the guanine-N7 position of the mRNA 5’ cap structure are ubiquitous among eukaryotes and commonly encoded by viruses. Here we provide a detailed protocol for the biochemical analysis of RNA cap methyltransferase activity of biological samples. This assay involves incubation of cap-methyltransferase-containing samples with a [32P]G-capped RNA substrate and S-adenosylmethionine (SAM) to produce RNAs with N7-methylated caps. The extent of cap methylation is then determined by P1 nuclease digestion, thin-layer chromatography (TLC), and phosphorimaging. The protocol described here includes additional steps for generating the [32P]G-capped RNA substrate and for preparing nuclear and cytoplasmic extracts from mammalian cells. This assay is ... [摘要]  甲基化mRNA 5'帽结构的鸟嘌呤-N7位置的甲基转移酶在真核生物中普遍存在并且通常由病毒编码。这里我们提供生物样品的RNA帽甲基转移酶活性的生化分析的详细方案。该测定包括将含有帽 - 甲基转移酶的样品与[32 P] G-加帽的RNA底物和S-腺苷甲硫氨酸(SAM)温育以产生具有N7-甲基化帽的RNA。然后通过P1核酸酶消化,薄层色谱(TLC)和磷成像确定帽甲基化的程度。此处描述的方案包括用于产生[32 P] G-加帽的RNA底物和用于从哺乳动物细胞制备核和细胞质提取物的附加步骤。该分析也适用于分析其他生物样品(包括重组蛋白制剂和来自分析分离和免疫沉淀/下拉实验的级分)的帽甲基转移酶活性。

【背景】mRNA的5'端的N7-甲基鸟苷帽是适当的真核mRNA加工,定位和翻译所必需的修饰。 ...

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