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Sodium acetate

醋酸钠

公司名称: Sigma-Aldrich
产品编号: S8750
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Molecular Size Analysis of Recombinant Importin-histone Complexes Using Analytical Ultracentrifugation
Author:
Date:
2020-05-20
[Abstract]  Histones constitute the protein components of nucleosomes. Despite their small sizes, histones do not diffuse through the nuclear pore complex. Instead, they are transported to the nucleus by importins, either alone or in complex with histone chaperones. Determining the molecular size of the importin-histone complexes is key to understanding the mechanism of histone transport and also the potential roles of importins as histone chaperones and in the assembly of nucleosomes. Here we report a simple and reproducible sedimentation-velocity based method to determine the molecular sizes of ... [摘要]  [摘要] 组蛋白构成核小体的蛋白质成分。尽管其尺寸很小,但组蛋白不会通过核孔复合物扩散。取而代之的是,它们单独或与组蛋白分子伴侣复合地被重要蛋白转运至细胞核。确定importin-histone复合物的分子大小是理解组蛋白转运机制的关键,也是importins作为组蛋白伴侣和在核小体组装中的潜在作用的关键。在这里,我们报告了一种简单且可重现的沉降速度为基础的方法,该方法使用分析超速离心法来确定importin-histone配合物的分子大小。该方法不使用任何报告子标签或与色谱柱树脂的相互作用,从而分析了天然蛋白质的相互作用。

[背景] 核小体是真核染色质的最基本的结构和功能单元。组蛋白H2A,H2B,H3和H 4是核小体的蛋白质成分。每个核包括147个碱基的DNA wrapp的对编绕Ñ H3-H4四聚体和H2A-H2B二聚体的两个拷贝(Luger的等人,1997年一)。像细胞中的其他蛋白质一样,组蛋白在细胞质中合成。然而,核小体组装在核中。尽管它们的小尺寸(单体是10-15 kDa)的,组蛋白不通过核孔复合物扩散,而是可以单独使用或在复合物与由组蛋白importins伴侣输送要么(约翰逊-SAL IBA 等人,2000 ; Baake 等等人,2001;Mosammaparast 等人,2001,2002a和2002b;Muhlhausser ...

Atomic Force Microscopy (AFM) Analysis of Cell Wall Structural Glycoproteins in vitro
Author:
Date:
2015-07-20
[Abstract]  Hydroxyproline-rich glycoproteins (HRGPs) are major protein components in dicot primary cell walls and generally account for more than 10% of the wall dry weight. As essential members of the HRGP superfamily, extensins (EXTs) presumably function in the cell wall by assembling into positively charged protein scaffolds (Cannon et al., 2008) that direct the proper deposition of other wall polysaccharides, especially pectins, to ensure correct cell wall assembly (Hall and Cannon, 2002; Lamport et al., 2011a). Extensins are recalcitrant to purification as they are rapidly ... [摘要]  富含羟脯氨酸的糖蛋白(HRGP)是双子叶原代细胞壁中的主要蛋白质组分,通常占壁干重的10%以上。作为HRGP超家族的主要成员,通过装配到带正电荷的蛋白质支架(Cannon等人,2008)中,可以推测伸展蛋白(EXT)在细胞壁中起作用,其指导其他壁多糖的适当沉积,特别是果胶,以确保正确的细胞壁组装(Hall和Cannon,2002; Lamport等人,2011a)。延伸素难以纯化,因为它们在进入细胞壁后快速交联成共价网络,但是存在可以提取新合成的延伸蛋白单体的短时间窗(Smith等人, 1984; Smith等人,,1986)。用于提取延伸蛋白和其他壁结构蛋白的详细方案早已被描述(Lamport等人,2011b)。这里详述的方案提供了一种方法,用于使用AFM在体外研究延伸素和潜在地其他细胞壁组分的自组装。

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