ASF1B Antibody

• 产品编号：CST-2769S      品牌：CST       原厂货号：2769S
• 产品分类：抗体 > 一抗 > 蛋白特异性一抗
• 应用分类：

描述：

ASF1B Antibody检测内源性ASF1B总蛋白水平。该抗体不能与ASF1A蛋白发生相互作用。通过合成的人源ASF1B蛋白羧基末端相应的多肽片段去免疫动物从而制备出多克隆抗体。通过蛋白A和多肽亲和层析纯化获得。ASF1蛋白首先在酿酒酵母（S.cerevisiae）中被鉴定，其基于在过表达时它能够解除阻遏转录沉默作用(1)。当在酵母和果蝇中仅存在ASF1基因时，哺乳动物细胞中包含两个高度同源的ASF1A和ASF1B基因(2)。ASF1A和ASF1B蛋白作为组蛋白伴侣的功能，它是将组蛋白H3/H4二聚体传递到CAF-1或HIRA组蛋白沉积复合物上，从而有助于DNA复制耦联和复制独立的核小体组装(2-5)。ASF1A和ASF1B蛋白都能结合到CAF-1，但仅有ASF1A结合到HIRA(5)。除了在DNA复制和基因沉默中起着重要作用，ASF1蛋白具有在DNA损伤修复、基因组的稳定和细胞内衰老的功能。在酵母和果蝇中ASF1基因的敲除可传递信号到不同的DNA损伤因子和DNA复制抑制因子、也可增加基因组的不稳定性和姊妹染色单体的交换、以及激活DNA破坏检查点(6-8)。在哺乳细胞中ASF1A和ASF1B基因敲除导致在S期的细胞堆积，这增加了H2A.X的磷酸化、中心体的复制和细胞凋亡(9,10)。ASF1A蛋白对于senescence-associated heterochromatin foci (SAHF)的形成是需要的，这就使ASF1A蛋白的过表达能诱导原代细胞的衰老(4)。ASF1A和ASF1B蛋白在S期是通过Tousled-like kinases TLK1 and TLK2被磷酸化，而在复制应激下被去磷酸化是通过Chk1 kinase使TLK1和TLK2的失活(11,12)。ASF1蛋白磷酸化的功能尚不清楚。

1. Singer, M.S. et al. (1998) Genetics 150, 613-632.
2. Mousson, F. et al. (2007) Chromosoma 116, 79-93.
3. Tang, Y. et al. (2006) Nat. Struct. Mol. Biol. 13, 921-929.
4. Zhang, R. et al. (2005) Dev. Cell. 8, 19-30.
5. Daganzo, S.M. et al. (2003) Curr. Biol. 13, 2148-2158.
6. Ramey, C.J. et al. (2004) Mol. Cell. Biol. 24, 10313-10327.
7. Prado, F. et al. (2004) EMBO Rep. 5, 497-502.
8. Tyler, J.K. et al. (1999) Nature 402, 555-560.
9. Sanematsu, F. et al. (2006) J. Biol. Chem. 281, 13817-13827.
10. Groth, A. et al. (2005) Mol. Cell. 17, 301-311.
11. Silljé, H.H. and Nigg, E.A. (2001) Curr. Biol. 11, 1068-1073.
12. Carrera, P. et al. (2003) Genes Dev. 17, 2578-2590.

原厂资料：

Homology

Species predicted to react based on 100% sequence homology: Mouse

Specificity / Sensitivity

ASF1B Antibody detects endogenous levels of total ASF1B protein. The antibody does not cross-react with ASF1A protein.

Source / Purification

Polyclonal antibodies are produced by immunizing animals with a synthetic peptide corresponding to the carboxy terminus of the human ASF1B protein. Antibodies are purified by protein A and peptide affinity chromatography.

Background

ASF1 was first identified in S. cerevisiae based on its ability to de-repress transcriptional silencing when overexpressed (1). While only one gene exists in yeast and Drosophila, mammalian cells contain the two highly homologous ASF1A and ASF1B genes (2). ASF1A and ASF1B function as histone chaperones, delivering histone H3/H4 dimers to CAF-1 or HIRA histone deposition complexes to facilitate replication-coupled and replication-independent nucleosome assembly on DNA (2-5). Both ASF1A and ASF1B bind to CAF-1, but only ASF1A binds to HIRA (5). In addition to playing a role in DNA replication and gene silencing, ASF1 functions in DNA damage repair, genome stability and cellular senescence. Deletion of ASF1 in yeast and Drosophila confers sensitivity to various DNA damaging agents and inhibitors of DNA replication, increases genomic instability and sister chromatid exchange, and activates the DNA damage checkpoint (6-8). Depletion of both ASF1A and ASF1B in mammalian cells results in the accumulation of cells in S phase, increased phosphorylation of H2A.X, centrosome amplification and apoptosis (9,10). ASF1A is required for the formation of senescence-associated heterochromatin foci (SAHF), with overexpression of ASF1A inducing senescence in primary cells (4). Both ASF1A and ASF1B are phosphorylated in S phase by the Tousled-like kinases TLK1 and TLK2, and are dephosphorylated when TLK1 and TLK2 are inactivated by Chk1 kinase in response to replicative stress (11,12). The function of ASF1 phosphorylation is not yet understood.

1. Singer, M.S. et al. (1998) Genetics 150, 613-632.
2. Mousson, F. et al. (2007) Chromosoma 116, 79-93.
3. Tang, Y. et al. (2006) Nat. Struct. Mol. Biol. 13, 921-929.
4. Zhang, R. et al. (2005) Dev. Cell. 8, 19-30.
5. Daganzo, S.M. et al. (2003) Curr. Biol. 13, 2148-2158.
6. Ramey, C.J. et al. (2004) Mol. Cell. Biol. 24, 10313-10327.
7. Prado, F. et al. (2004) EMBO Rep. 5, 497-502.
8. Tyler, J.K. et al. (1999) Nature 402, 555-560.
9. Sanematsu, F. et al. (2006) J. Biol. Chem. 281, 13817-13827.
10. Groth, A. et al. (2005) Mol. Cell. 17, 301-311.
11. Silljé, H.H. and Nigg, E.A. (2001) Curr. Biol. 11, 1068-1073.
12. Carrera, P. et al. (2003) Genes Dev. 17, 2578-2590.

注意事项：

Storage: Supplied in 10 mM sodium HEPES (pH 7.5), 150 mM
NaCl, 100 µg/ml BSA and 50% glycerol. Store at –20°C.
Do not aliquot the antibody.