ASF1B Antibody

2769:

Immunoprecipitation , Western Blotting

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

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.

Western Blotting

Western blot analysis of whole cell lysates from HeLa, Raji, HCT116 and COS cells using ASF1B Antibody.

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.

• Campeau, E. et al. (2009) PLoS One 4, e6529. Applications: Western Blotting

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For Research Use Only. Not For Use In Diagnostic Procedures.