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Colloidal Blue staining kit

胶体蓝染色试剂盒

Company: Thermo Fisher Scientific
Catalog#: LC6025
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Separation and Detection of Phosphorylated and Nonphosphorylated BvgA, a Bordetella pertussis Response Regulator, in vivo and in vitro
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Date:
2013-11-20
[Abstract]  Protein phosphorylation plays a central role in signal transduction in bacteria. However, separation and detection of the phosphorylated protein from its nonphosphorylated form remain challenging. Here we describe a method to detect phosphorylation of the Bordetella pertussis response regulator BvgA, which is phosphorylated at an aspartate residue (Boulanger et al., 2013). This method is based on the proprietary adduct, Phos-tagTM, a dinuclear metal complex, which together with Zn2+ or Mn2+, forms a complex with a phosphomonoesterdianion, such as the phosphorylated aspartate of a response regulator (Barbieri and Stock, 2008; Kinoshita and Kinoshita-Kikuta, 2011). For in vivo detection, B. pertussis cells are lysed in ... [摘要]  蛋白质磷酸化在细菌的信号转导中起着中心作用。然而,从其非磷酸化形式分离和检测磷酸化蛋白仍然是挑战性的。在这里我们描述了检测百日咳博德特氏菌响应调节剂BvgA的磷酸化的方法,其在天冬氨酸残基被磷酸化(Boulanger等人,2013)。该方法基于专有的加合物Phos-tag TM sup/TM,其是双核金属络​​合物,其与Zn 2+或Mn 2+反应, ,与磷酸二酯酶形成复合物,例如应答调节剂的磷酸化天冬氨酸(Barbieri和Stock,2008; Kinoshita和Kinoshita-Kikuta,2011)。对于体内检测,在4℃下在轻度甲酸中裂解百日咳细胞以使磷酸 - 天冬氨酸键的破坏最小化,并且通过包含Phos标签的电泳(SDS-PAGE)将磷酸化的BvgA从其非磷酸化形式分离> TM 。随后通过蛋白质印迹分析检测两种形式的BvgA。还容易实现在体外用乙酰磷酸盐处理后形成的磷酸化BvgA的水平的量化。因此,该技术允许容易地评估B中BvgA磷酸化的水平。百日咳和 。大肠杆菌在不同实验室条件下在体内或在不同反应条件下在体外磷酸化后(本研究部分由NIH的Intramural Research Programme支持, NIDDK)。

Tandem Affinity Purification in Drosophila Heads and Ovaries
Author:
Date:
2012-08-05
[Abstract]  Tandem affinity purification (TAP) (Pugi et al.,2001; Rigaut et al., 1999) is a method that uses a tagging approach of a target protein of interest for a two-step purification scheme in order to pull down protein complexes under native conditions and expression levels. The TAP tag consists of three components: a calmodulin-binding peptide, a Tobacco etch virus (TEV) protease cleavage site and Protein A which is an immunoglobulin G (IgG)-binding domain. This protocol was modified from the original methodology used in yeast cells(Pugi et al.,2001; Rigaut et al., 1999) for isolation of protein complexes from Drosophila heads and ovaries expressing a TAP tagged protein of interest. To determine in vivo binding partners of the Drosophila fragile X ... [摘要]  串联亲和纯化(TAP)(Pugi等人,2001; Rigaut等人,1999)是使用目标靶蛋白的标记方法的方法两步纯化方案以在天然条件和表达水平下下拉蛋白复合物。 TAP标签由三种组分组成:钙调素结合肽,烟草蚀纹病毒(TEV)蛋白酶切割位点和作为免疫球蛋白G(IgG)结合结构域的蛋白A.该方案从酵母细胞中使用的原始方法(Pugi等人,2001; Rigaut等人,1999)修饰,用于从果蝇头分离蛋白质复合物,以及卵巢表达感兴趣的TAP标记的蛋白质。为了确定果蝇脆弱X蛋白(dFMR1)的体内结合伴侣,我们开发了表达重组形式的具有羧基末端TAP标签的dFMR1的苍蝇的转基因菌株(Tsai和Carstens,2006)。为了确保构建体在野生型水平表达,我们在救援突变不育表型的基因组拯救构建体的上下文中工程化这种形式的标记蛋白质。使用温和条件进行纯化过程以维持天然蛋白质相互作用。对于在果蝇S2细胞培养物中的TAP方法,我们成功地使用了由Tsai和Carstens先前公布的方案(Tsai和Carstens,2006; Bhogal等人,2011)。

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