CST, 2665S, Phospho-Chk2 (Ser33/35) Antibody

Polyclonal Antibody for studying Chk2 (Ser33/Ser35) phosphate. Validated for Western Blotting. Available in 2 sizes. Highly specific and rigorously validated in-house, Phospho-Chk2 (Ser33/35) Antibody (CST #2665) is ready to ship. Product Usage Information Western Blotting: 1:1000 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. Protocol Available protocols: Western Blotting Specificity / Sensitivity Phospho-Chk2 (Ser33/35) Antibody detects endogenous levels of Chk2 only when phosphorylated at serine 33/35. This antibody does not cross-react with Chk2 phosphorylated at other sites. Species Reactivity: Human, Monkey Source / Purification Polyclonal antibodies are produced by immunizing animals with a synthetic phosphopeptide corresponding to residues surrounding Ser33/35 of human Chk2. Antibodies are purified by protein A and peptide affinity chromatography. Background Chk2 is the mammalian orthologue of the budding yeast Rad53 and fission yeast Cds1 checkpoint kinases (1-3). The amino-terminal domain of Chk2 contains a series of seven serine or threonine residues (Ser19, Thr26, Ser28, Ser33, Ser35, Ser50, and Thr68) each followed by glutamine (SQ or TQ motif). These are known to be preferred sites for phosphorylation by ATM/ATR kinases (4,5). After DNA damage by ionizing radiation (IR), UV irradiation, or hydroxyurea treatment, Thr68 and other sites in this region become phosphorylated by ATM/ATR (5-7). The SQ/TQ cluster domain, therefore, seems to have a regulatory function. Phosphorylation at Thr68 is a prerequisite for the subsequent activation step, which is attributable to autophosphorylation of Chk2 at residues Thr383 and Thr387 in the activation loop of the kinase domain (8). Alternate Names Cds1; Cds1 homolog; Checkpoint kinase 2; checkpoint-like protein CHK2; CHEK2; CHK2; CHK2 checkpoint homolog; CHK2 checkpoint homolog (S. pombe); hCds1; HuCds1; LFS2; PP1425; protein kinase CHK2; RAD53; Serine/threonine-protein kinase Chk2 Specification REACTIVITY: H Mk SENSITIVITY: Endogenous MW (kDa): 62 SOURCE: Rabbit