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Ammonium sulfate

Ammonium sulfate

Company: Sigma-Aldrich
Catalog#: A2939
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A Protocol of Using White/Red Color Assay to Measure Amyloid-induced Oxidative Stress in Saccharomyces cerevisiae
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Date:
2017-08-05
[Abstract]  The yeast Saccharomyces cerevisiae (S. cerevisiae) harboring ade1 or ade2 mutations manifest red colony color phenotype on rich yeast medium YPD. In these mutants, intermediate metabolites of adenine biosynthesis pathway are accumulated. Accumulated intermediates, in the presence of reduced glutathione, are transported to the vacuoles, whereupon the development of the red color phenotype occurs. Here, we describe a method to score for presence of oxidative stress upon expression of amyloid-like proteins that would convert the red phenotype of ade1/ade2 mutant yeast to white. This assay could be a useful tool for screening for drugs with anti-amyloid aggregation or anti-oxidative stress potency. [摘要]  携带 ade1 或 ade2 突变体的酵母酿酒酵母( S。cerevisiae )在富酵母上显示红色菌落色表型 中等YPD。 在这些突变体中,积累了腺嘌呤生物合成途径的中间代谢物。 在还原型谷胱甘肽存在下,累积的中间体被转移到空泡中,由此发生红色表型的发生。 在这里,我们描述了一种通过淀粉样样蛋白的表达来评估氧化应激存在的方法,其将将ade1 / ade2突变体酵母的红色表型转化为白色。 该测定可能是用于筛选具有抗淀粉样蛋白聚集或抗氧化应激效力的药物的有用工具。
【背景】ADE1或ADE2基因的酵母(Saccharomyces cerevisiae)突变体(例如,,ade1Δ,ade2Δ ade1-14 ade2-),当在YPD(酵母蛋白胨葡萄糖)培养基上生长时,作为腺嘌呤生物合成途径的中间代谢物的液泡(Sharma等人,2003)。包含早熟终止密码子的可抑制等位基因ade1-14 已被广泛用于评价翻译的朊病毒状态终止因子Sup35蛋白。在[ psi - ]酵母中,Sup35p保持可溶性和功能性,因此翻译在有效地终止于ade1-14的早熟终止密码子>等位基因导致截短和非功能性Ade1蛋白的合成。因此,腺嘌呤生物合成级联保持不完整,导致中间体代谢产物的积累,产生酵母的红色表型。相比之下,在[PSI + ...

In vitro Histone H3 Cleavage Assay for Yeast and Chicken Liver H3 Protease
Author:
Date:
2017-01-05
[Abstract]  Histone proteins are subjected to a wide array of reversible and irreversible post-translational modifications (PTMs) (Bannister and Kouzarides, 2011; Azad and Tomar, 2014). The PTMs on histones are known to regulate chromatin structure and function. Histones are irreversibly modified by proteolytic clipping of their tail domains. The proteolytic clipping of histone tails is continuously attracting interest of researchers in the field of chromatin biology. We can recapitulate H3-clipping by performing in vitro H3 cleavage assay. Here, we are presenting the detailed protocol to perform in vitro H3 cleavage assay. [摘要]  组蛋白受到广泛的可逆和不可逆的翻译后修饰(PTM)(Bannister和Kouzarides,2011; Azad和Tomar,2014)。已知组蛋白上的PTM调节染色质结构和功能。组蛋白不可逆地修饰其尾部结构域的蛋白水解剪切。组蛋白尾巴的蛋白水解剪切不断吸引研究人员在染色质生物学领域的兴趣。我们可以通过在体外实施H3切割测定来概括H3-剪切。在这里,我们提供了详细的方案来进行体外实验。

背景 组蛋白H3剪切是染色质修饰和调节最不了解的机制。预期H3剪切将永久性消除可能影响染色质相关事件的核小体的PTM。此外,切割的组蛋白的命运仍在研究之中,并且已经表明,切割的组蛋白可能在染色质的特定区域被再循环,或者它们被靶向降解。有各种各样的报告描述了不同生物中组蛋白H3的体内剪切,而组蛋白H3特异性剪切的体外测定是有限的。我们需要一种有效和稳健的体外实验来鉴定组蛋白特异性蛋白酶。为此,我们提出了一个可用于检查酵母和鸡肝组织蛋白H3蛋白酶的体外组蛋白H3剪切活性的方案。我们已经优化了测定的温度和pH条件。在我们优化的条件下,发现蛋白酶在所有核心组蛋白中特异性切割组蛋白H3。我们在最近的出版物(Chauhan等人,2016年; Chauhan和Tomar,2016年; Azad和Tomar,2016; ...

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