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NaH2PO4

Sodium phosphate monobasic

Company: Sigma-Aldrich
Catalog#: S3139
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Preparation of Yeast tRNA Sample for NMR Spectroscopy
Author:
Date:
2020-06-20
[Abstract]  Transfer RNAs (tRNAs) are heavily decorated with post-transcriptional modifications during their biosynthesis. To fulfil their functions within cells, tRNAs undergo a tightly controlled biogenesis process leading to the formation of mature tRNAs. In addition, functions of tRNAs are often modulated by their modifications. Although the biological importance of post-transcriptional RNA modifications is widely appreciated, methods to directly detect their introduction during RNA biosynthesis are rare and do not easily provide information on the temporal nature of events. To obtain information on the tRNA maturation process, we have developed a methodology, using NMR as a tool to monitor tRNA maturation in a non-disruptive and continuous fashion in cellular extracts. By following the ... [摘要]  [摘要 ] 转移RNA(tRNA )在其生物合成过程中大量修饰有转录后修饰。为了在细胞内履行其功能,tRNA 经历了严格控制的生物生成过程,导致了成熟的tRNA 的形成。此外,tRNA的功能通常是虽然转录后修饰RNA的生物学重要性被广泛理解,方法直接检测它们的RNA生物合成过程中引入是罕见的,并且不容易提供上events.To的时间特性信息获取的信息的tRNA 成熟 在此过程中,我们开发了一种方法,使用NMR作为监测细胞提取物中tRNA 成熟的无中断和连续方式。通过模型酵母tRNA 的时间分辨NMR 成熟,我们发现修饰是该方法的实施需要对具有不同修饰状态的tRNA 样品进行NMR光谱学分析,以鉴定各个修饰的NMR特征。此处将介绍用于NMR光谱分析修饰途径的tRNA 样品的生产,并在酵母tRNA Phe 上进行例证,但可以通过更改构建体的序列扩展到其他tRNA 。该方案描述了未修饰的生产通过体外转录获得tRNA 样品,并通过在大肠杆菌中重组表达tRNA 产生修饰的tRNA 样品。大肠杆菌。

[背景 ] 在生活的各个领域,合成和RNA的成熟包括在特定地点的核苷酸的转录后的化学修饰。在不同的RNA家族,tRNA基因不仅显示最高多种化学修饰,而且密度最高每转录修饰(〜中经修饰的核苷酸8-25%的tRNA 各种生物体的)(Boccaletto ...

Manganese Superoxide Dismutase Activity Assay in the Yeast Saccharomyces cerevisiae
Author:
Date:
2020-03-05
[Abstract]  Superoxide dismutases (SODs) act as a primary defence against reactive oxygen species (ROS) by converting superoxide anion radicals (O2-) into molecular oxygen (O2) and hydrogen peroxide (H2O2). Members of this enzyme family include CuZnSODs, MnSODs, FeSODs, and NiSODs, depending on the nature of the cofactor that is required for proper activity. Most eukaryotes, including yeast, possess CuZnSOD and MnSOD. This protocol aims at assessing the activity of the yeast Saccharomyces cerevisiae MnSOD Sod2p from cellular extracts using nitroblue tetrazolium staining. This method can be used to estimate the cellular bioavailability of Mn2+ as well as to evaluate the redox state of the cell. [摘要]  [摘要 ] 超氧化物歧化酶(SOD能)充当主防御针对反应性氧物质(ROS)通过转换的超氧阴离子自由基(O 2 - )为分子氧(O 2 )和过氧化氢(H 2 ? 2 )。这种酶的家庭成员包括CuZnSODs ,MnSODs ,FeSODs 和NiSODs ,这取决于是需要适当的活动辅助因子的性质。大多数真核生物,包括酵母,都具有CuZnSOD 和MnSOD 。该协议旨在评估酵母的活性 使用硝基蓝四唑染色法从细胞提取物中提取酿酒酵母MnSOD Sod2p 。该方法可用于估计Mn 2+ 的细胞生物利用度以及评估细胞的氧化还原状态。

[背景 ] 的SODs被定义为减少正常有氧代谢为氧气和过氧化氢期间形成的氧的有害自由基含金属的抗氧化剂酶。:这些酶是基于需要作为辅因子进行适当的酶活性的金属分类CuZnSODs ,MnSODs ,FeSODs ,和NiSODs 。在酿酒酵母中,有两个S OD :CuZn-Sod1p和Mn-Sod2p(Abreu和Cabelli ...

Identifying Protein Interactions with Histone Peptides Using Bio-layer Interferometry
Author:
Date:
2018-09-20
[Abstract]  Histone post-translational modifications (PTMs) regulate numerous cellular processes, including gene transcription, cell division, and DNA damage repair. Most histone PTMs affect the recruitment or exclusion of reader proteins from chromatin. Here, we present a protocol to measure affinity and interaction kinetics between histone peptides and the recombinant protein using Bio-layer interferometry. [摘要]  组蛋白翻译后修饰(PTM)调节许多细胞过程,包括基因转录,细胞分裂和DNA损伤修复。 大多数组蛋白PTM影响从染色质中募集或排除读取蛋白。 在这里,我们提出了一个协议,使用生物层干涉测量法测量组蛋白肽和重组蛋白之间的亲和力和相互作用动力学。

【背景】真核染色质结构大致分为常染色质和异染色质(Cheung和Lau,2005),异染色质结构根据组蛋白翻译后修饰(PTM)的组合进一步细分。这些PTM不仅改变染色质构象,还在基因表达和蛋白质募集中建立直接调节作用(Felsenfeld和Groudine,2003; Allshire和Madhani,2017)。组蛋白PTM的无数组合 - 包括乙酰化,磷酸化,甲基化,泛素化,生物素化,SUMO化和脯氨酸异构化,统称为“组蛋白标记” - 可以被发现,特别是在从核小体核心突出的非结构化N末端尾部( Guetg和Santoro,2012)。这些PTM通过不同“读者”或效应蛋白的活动调节许多细胞过程,包括基因转录,细胞分裂和DNA损伤修复(Suganuma和Workman,2011)(Musselman et al。, 2012)。因此,已经做出很大努力来识别读者的组蛋白修饰。

使用常规方法(例如,表面等离子体共振[SPR]和SPR成像[SPRi]生物传感器)研究读取蛋白与其靶蛋白PTM之间的相互作用通常需要大量底物或复杂的多步实验方法并且由于各种方法特定的限制而变得复杂。这些问题排除了量化相互作用强度的简便性和准确性(Phizicky和Fields,1995; ...

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