Site-specific DNA Mapping of Protein Binding Orientation Using Azidophenacyl Bromide (APB)
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Author:
Date:
2020-06-20
[Abstract] The orientation of a DNA-binding protein bound on DNA is determinative in directing the assembly of other associated proteins in the complex for enzymatic action. As an example, in a replisome, the orientation of the DNA helicase at the replication fork directs the assembly of the other associated replisome proteins. We have recently determined the orientation of Saccharalobus solfataricus (Sso) Minichromosome maintenance (MCM) helicase at a DNA fork utilizing a site-specific DNA cleavage and mapping assay. Here, we describe a detailed protocol for site-specific DNA footprinting using 4-azidophenacyl bromide (APB). This method provides a straightforward, biochemical method to reveal the DNA binding orientation of SsoMCM helicase and can be applied to other DNA binding ...
[摘要] [摘要 ] 结合在DNA上的DNA结合蛋白的方向决定了复合物中其他相关蛋白的组装,以进行有意的作用。例如,在复制体中,复制叉处的DNA解旋酶的方向指导我们最近通过定点DNA切割和作图分析确定了DNA叉处的Saccharalobus solfataricus (Sso )微型染色体维持(MCM)解旋酶的方向。 使用4-叠氮苯甲酰溴(APB)进行位点特异性DNA足迹的详细协议。此方法提供了一种直接的生化方法来揭示Sso MCM解旋酶的DNA结合方向,并可应用于其他DNA结合蛋白。
[背景 ] DNA复制是其中基因组双链体链分离成两个模板链中,超前和滞后strands.This功能是通过在生命。如同其他环状六聚体的解旋酶结构域的所有的环状六聚体解旋酶的处理,从理论上讲,这些结构域中的任何一个都可以在易位期间朝向复制叉,并且与已知的3'-5 MCM包含两个结构域; N端结构域(NTD)和C端结构域(CTD)。' 易位directionality.T 他MCM解旋酶负载到DNA起源作为具有面向易位期间解旋酶的每个other.The取向管畸形双六聚体确定两个六聚体是否彼此或旁路彼此活性unwinding.Our最近的一篇论文中离解远表明Saccharolobus solfataricus (Sso MCM )通过NTD引导DNA解链(Perera和Trakselis ...
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In vitro Analysis of Ubiquitin-like Protein Modification in Archaea
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Author:
Date:
2018-05-20
[Abstract] The ubiquitin-like (Ubl) protein is widely distributed in Archaea and involved in many cellular pathways. A well-established method to reconstitute archaeal Ubl protein conjugation in vitro is important to better understand the process of archaeal Ubl protein modification. This protocol describes the in vitro reconstitution of Ubl protein modification and following analysis of this modification in Haloferax volcanii, a halophilic archaeon serving as the model organism.
[摘要] 泛素样(Ubl)蛋白广泛分布于古细菌中并参与许多细胞途径。 为了更好地理解古细菌Ub1蛋白质修饰的过程,重建体外古细菌Ubl蛋白质缀合物的完善方法是很重要的。 该协议描述了Ubl蛋白质修饰的体外重建以及在作为模型生物的嗜盐古细菌Haloferax volcanii 中对这种修饰进行分析。
【背景】泛素(Ub)与靶蛋白共价连接的过程被称为泛素化,其控制真核细胞中大量的细胞过程(Glickman和Ciechanover,2002; Komander和Rape,2012)。遍在蛋白化由一系列酶(包括Ub激活酶(E1),Ub结合酶(E2s)和Ub连接酶(E3s))催化。泛素化的体外重建是确定酶之间或E3与蛋白质底物之间特异性的有用测定法(Zhao等人,2012)。在古细菌中,Ubl蛋白SAMP采用Ub折叠,并且与E1样酶UbaA催化的蛋白靶标异肽连接[Maupin-Furlow,(2014)综述]。尽管E1同系物在古细菌中广泛存在,但基于一级序列比较,在大多数古细菌中未预测经典E2或E3酶。我们最近对Haloferax volcanii的研究表明甲硫氨酸亚砜还原酶A(MsrA)是Ubl蛋白质修饰(sampylation)与UbaA一起在体内温和的氧化条件下和< (体外)(fu="">
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