Di-Methyl-Histone H3 (Lys27) (D18C8) XP??Rabbit mAb?(Alexa Fluor??647 Conjugate)

• 产品编号：CST-12244S      品牌：CST       原厂货号：12244S
• 产品分类：抗体 > 一抗 > 染料标记抗体
• 应用分类：

描述：

Di-Methyl-Histone H3 (Lys27) (D18C8) XP® Rabbit mAb 兔单抗(Alexa Fluor® 647 Conjugate)能够检测内源性的Lys27位点二甲基化的组蛋白H3。该抗体会与Lys27位点单甲基化的组蛋白H3产生一些交叉反应，但不会与Lys27位点非甲基化或三甲基化的发生交叉反应。此外，也不会与Lys4，Lys9，Lys36 位点单甲基化，二甲基化或三甲基化的组蛋白H3或Lys20位点单、二或三甲基化的组蛋白 H4发生交叉反应。该CST抗体偶联了Alexa Fluor® 647荧光染料，通过直标法流式细胞术和免疫荧光分析在人细胞内进行内部检测。它与未偶联的Di-Methyl-Histone H3 (Lys27) (D18C8) XP® Rabbit mAb #9728兔单抗具有相同的种属交叉反应性。核小体是构成染色质的基本结构单位，由四种核心组蛋白（H2A、H2B、H3和H4）组成。最初认为组蛋白的功能是作为DNA包装的静态骨架，但现在研究表明，组蛋白是一个动态的蛋白，参与了多种类型的翻译后修饰，包括乙酰化，磷酸化，甲基化以及泛素化（1）。组蛋白甲基化是基因组活动和非活动区域形成的一个重要决定因素，同时对发育过程中基因组的正确编程也是至关重要的（2,3）。位于组蛋白H3（Arg2，17，26）和H4 (Arg3)的精氨酸甲基化能够促进转录激活，该甲基化作用是由蛋白精氨酸甲基转移酶 （PRMTs）家族催化的，其中包括共激活因子 PRMT1 和 CARM1 （PRMT4）（4）。与之不同的是，组蛋白赖氨酸甲基转移酶家族更多样化，除了其中一个，其它所有成员都包含一个保守的SET催化结构域，该SET域（Su(var)3-9, Enhancer of zeste以及Trithorax蛋白）最初是在果蝇中得到确认的。赖氨酸甲基化主要发生于组蛋白 H3 （Lys4，9、 27、 36、 79） 和 H4 (Lys20)， 与转录激活和沉默都直接相关 (4)。这些赖氨酸残基的甲基化能够协调染色质修饰酶的募集，这些染色质修饰酶都含有甲基化赖氨酸结合模块，比如染色质结构域(HP1, PRC1), PHD指纹 (BPTF, ING2), tudor 结构域 (53BP1)以及 WD-40 结构域(WDR5) (5-8)。经过研究，人们发现了如PADI4，LSD1，JMJD1，JMJD2, 以及 JHDM1等组蛋白去甲基化酶，这些都表明甲基化修饰是一个可逆的表观遗传学标志（9）。

1. Peterson, C.L. and Laniel, M.A. (2004) Curr Biol 14, R546-51.
2. Kubicek, S. et al. (2006) Ernst Schering Res Found Workshop , 1-27.
3. Lin, W. and Dent, S.Y. (2006) Curr Opin Genet Dev 16, 137-42.
4. Lee, D.Y. et al. (2005) Endocr Rev 26, 147-70.
5. Daniel, J.A. et al. (2005) Cell Cycle 4, 919-26.
6. Shi, X. et al. (2006) Nature 442, 96-9.
7. Wysocka, J. et al. (2006) Nature 442, 86-90.
8. Wysocka, J. et al. (2005) Cell 121, 859-72.
9. Trojer, P. and Reinberg, D. (2006) Cell 125, 213-7.

原厂资料：

Specificity / Sensitivity

Di-Methyl-Histone H3 (Lys27) (D18C8) XP® Rabbit mAb (Alexa Fluor® 647 Conjugate) recognizes endogenous levels of histone H3 when di-methylated at Lys27. The antibody shows some cross-reactivity with mono-methylated Lys27, but does not cross-react with non-methylated or tri-methylated Lys27. In addition, the antibody does not cross-react with mono-methylated, di-methylated or tri-methylated histone H3 Lys4, Lys9, Lys36, or histone H4 Lys20.

Source / Purification

Monoclonal antibody is produced by immunizing animals with a synthetic peptide corresponding to the amino terminus of histone H3 in which Lys27 is di-methylated.

Description

This Cell Signaling Technology antibody is conjugated to Alexa Fluor® 647 fluorescent dye and tested in-house for direct flow cytometric and immunofluorescent analysis in human cells. The antibody is expected to exhibit the same species cross-reactivity as the unconjugated Di-Methyl-Histone H3 (Lys27) (D18C8) XP® Rabbit mAb #9728.

Background

The nucleosome, made up of four core histone proteins (H2A, H2B, H3, and H4), is the primary building block of chromatin. Originally thought to function as a static scaffold for DNA packaging, histones have now been shown to be dynamic proteins, undergoing multiple types of post-translational modifications, including acetylation, phosphorylation, methylation, and ubiquitination (1). Histone methylation is a major determinant for the formation of active and inactive regions of the genome and is crucial for the proper programming of the genome during development (2,3). Arginine methylation of histones H3 (Arg2, 17, 26) and H4 (Arg3) promotes transcriptional activation and is mediated by a family of protein arginine methyltransferases (PRMTs), including the co-activators PRMT1 and CARM1 (PRMT4) (4). In contrast, a more diverse set of histone lysine methyltransferases has been identified, all but one of which contain a conserved catalytic SET domain originally identified in the Drosophila Su(var)3-9, Enhancer of zeste, and Trithorax proteins. Lysine methylation occurs primarily on histones H3 (Lys4, 9, 27, 36, 79) and H4 (Lys20) and has been implicated in both transcriptional activation and silencing (4). Methylation of these lysine residues coordinates the recruitment of chromatin modifying enzymes containing methyl-lysine binding modules such as chromodomains (HP1, PRC1), PHD fingers (BPTF, ING2), tudor domains (53BP1), and WD-40 domains (WDR5) (5-8). The discovery of histone demethylases such as PADI4, LSD1, JMJD1, JMJD2, and JHDM1 has shown that methylation is a reversible epigenetic marker (9).

1. Peterson, C.L. and Laniel, M.A. (2004) Curr Biol 14, R546-51.
2. Kubicek, S. et al. (2006) Ernst Schering Res Found Workshop , 1-27.
3. Lin, W. and Dent, S.Y. (2006) Curr Opin Genet Dev 16, 137-42.
4. Lee, D.Y. et al. (2005) Endocr Rev 26, 147-70.
5. Daniel, J.A. et al. (2005) Cell Cycle 4, 919-26.
6. Shi, X. et al. (2006) Nature 442, 96-9.
7. Wysocka, J. et al. (2006) Nature 442, 86-90.
8. Wysocka, J. et al. (2005) Cell 121, 859-72.
9. Trojer, P. and Reinberg, D. (2006) Cell 125, 213-7.

注意事项：

Storage: Supplied in PBS (pH 7.2), less than 0.1% sodium
azide and 2 mg/ml BSA. Store at 4°C. Do not aliquot the anti-
body. Protect from light. Do not freeze.