Chk1 (fosfo Ser280) Antilichaam

Required for checkpoint mediated cell cycle arrest in response to DNA damage or the presence of unreplicated DNA. May also negatively regulate cell cycle progression during unperturbed cell cycles. Recognizes the substrate consensus sequence [R-X-X-S/T]. Binds to and phosphorylates CDC25A, CDC25B and CDC25C. Phosphorylation of CDC25A at 'Ser-178' and 'Thr-507' and phosphorylation of CDC25C at 'Ser-216' creates binding sites for 14-3-3 proteins which inhibit CDC25A and CDC25C. Phosphorylation of CDC25A at 'Ser-76', 'Ser-124', 'Ser-178', 'Ser-279' and 'Ser-293' promotes proteolysis of CDC25A. Inhibition of CDC25 activity leads to increased inhibitory tyrosine phosphorylation of CDK-cyclin complexes and blocks cell cycle progression. Binds to and phosphorylates RAD51 at 'Thr-309', which may enhance the association of RAD51 with chromatin and promote DNA repair by homologous recombination. Binds to and phosphorylates TLK1 at 'Ser-743', which prevents the TLK1-dependent phosphorylation of the chromatin assembly factor ASF1A. This may affect chromatin assembly during S phase or DNA repair. May also phosphorylate multiple sites within the C-terminus of TP53, which promotes activation of TP53 by acetylation and enhances suppression of cellular proliferation.

1111

O14757

NP_001107593.1

Human

Chk1 (Phospho-Ser280) antibody was raised against a peptide sequence around phosphorylation site of serine 280 (V-T-S (p) -G-G) derived from Human Chk1.

Unconjugated

Primary Antibodies

Phospho-Specific, Cell Cycle

Antibodies were purified by affinity-chromatography using epitope-specific phosphopeptide. Non-phospho specific antibodies were removed by chromatogramphy using non-phosphopeptide.

1 mg/mL

Antibody supplied in phosphate buffered saline (without Mg2+ and Ca2+), pH 7.4, 150mM NaCl, 0.02% sodium azide and 50% glycerol.

Phospho-Specific

Blue Ice

Store antibody at -20˚ C for up to one year.

56 kDa

This antibody detects endogenous level of Chk1 only when phosphorylated at serine 280.

Western Blot: 1:500~1:1000

CHEK1

Checkpoint kinase 1

Homo sapiens

Conn CW, et al. (2004) Dev Cell; 7 (2) : 275-81King FW, et al. (2004) Cell Cycle; 3 (5) : 634-7Shtivelman E, et al. (2002) Curr Biol; 12 (11) : 919-24

CHK1, HSTF1, CHEK1, Chk1

WB

166295194

Liquid