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Goat anti-Mouse IgG (H+L) Secondary Antibody, HRP

山羊抗小鼠

Company: Thermo Fisher Scientific
Catalog#: 31430
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Biochemical Analysis of Dimethyl Suberimidate-crosslinked Yeast Nucleosomes
Author:
Date:
2018-03-20
[Abstract]  Nucleosomes are the fundamental unit of eukaryotic chromosome packaging, comprised of 147 bp of DNA wrapped around two molecules of each of the core histone proteins H2A, H2B, H3, and H4. Nucleosomes are symmetrical, with one axis of symmetry centered on the homodimeric interaction between the C-termini of the H3 molecules. To explore the functional consequences of nucleosome symmetry, we designed an obligate pair of H3 heterodimers, termed H3X and H3Y, allowing us to compare cells with single or double H3 alterations. Our biochemical validation of the heterodimeric X-Y interaction included intra-nucleosomal H3 crosslinking using dimethyl suberimidate (DMS). Here, we provide a detailed protocol for the use of DMS to analyze yeast nucleosomes. [摘要]  核小体是真核染色体包装的基本单元,由围绕核心组蛋白H2A,H2B,H3和H4中的每一个的两个分子包裹的147bp DNA组成。 核小体是对称的,一个对称轴以H3分子的C-末端之间的同源二聚体相互作用为中心。 为了探索核小体对称性的功能性后果,我们设计了一对特异性H3异二聚体,称为H3X和H3Y,使我们能够比较具有单一或双重H3改变的细胞。 我们对异二聚体X-Y相互作用的生物化学验证包括使用二甲基琥珀三酸酯(DMS)进行的核内H3交联。 在这里,我们提供了使用DMS来分析酵母核小体的详细方案。

【背景】组蛋白的翻译后修饰影响染色体生物学的各个方面,包括转录,复制,修复和重组。因为核小体包含每个核心组蛋白的两个拷贝,所以修饰可以是对称的(在两个H3尾部上的相同修饰,例如,在核小体内的两个H3尾部上的K27me(Voigt等人

对于单个核小体内H3X-H3Y相互作用的生化验证,我们生成了表达细菌生物素连接酶BirA,N-末端V5-标记的H3X和N-末端生物素接受表位标记的H3Y的酵母菌株(Beckett等人, 1999)。 ...

Hepatitis C virus Cell-to-cell Spread Assay
Author:
Date:
2014-12-20
[Abstract]  Hepatitis C virus (HCV) can infect naïve cells via entry of “cell-free” extracellular virus or direct “cell-to-cell” transmission. Here, we describe an assay for detecting HCV cell-to-cell transmission, using a non-growing cell culture system that avoids confounding effects of cell growth. The assay consists of infecting a small number of cells in a confluent monolayer and then blocking subsequent cell-free extracellular virions with a neutralizing antibody such that only cell-to-cell transmission may occur. Under these conditions, incubation at 37 °C results in the formation of infected cell foci. The extent of cell-to-cell spread can then be determined by counting the number of cells in each focus. The assay may be modified to assess the effects of inhibitors and/or specific cellular ... [摘要]  丙型肝炎病毒(HCV)可通过"无细胞"细胞外病毒的进入或直接的"细胞到细胞"传递而感染初始细胞。 在这里,我们描述检测HCV细胞到细胞传播,使用一个非增长的细胞培养系统,避免细胞生长的混杂效应的测定。 该测定法包括感染汇合单层中的少量细胞,然后用中和抗体阻断随后的无细胞的细胞外病毒粒子,使得仅可发生细胞与细胞的传递。 在这些条件下,在37℃下孵育导致感染的细胞病灶的形成。 然后可以通过计数每个焦点中的细胞数量来确定细胞与细胞扩散的程度。 可以修改测定以评估抑制剂和/或特异性细胞基因对HCV的细胞与细胞扩散的影响。

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