Chk2 (CHEK2) pSer516 Rabbit Polyclonal Antibody

Specifications

Product Data
Applications	WB
Recommend Dilution	Suitable for use in Western blot (1:500~1:1000).
Reactivity	Human
Host	Rabbit
Clonality	Polyclonal
Immunogen	The antiserum was produced against synthesized phosphopeptide derived from human Chk2 around the phosphorylation site of serine 516 (Q-P-SP-T-S).
Specificity	The antibody was affinity-purified from rabbit antiserum by affinity-chromatography using epitope-specific phosphopeptide. The antibody against non-phosphopeptide was removed by chromatogramphy using non-phosphopeptide corresponding to the phosphorylation site. Chk2 (phospho-Ser516) antibody detects endogenous levels of Chk2 only when phosphorylated at serine 516.
Formulation	PBS (without Mg2+ and Ca2+), pH 7.4, 150 mM NaCl, 0.02% Sodium Azide and 50% Glycerol. State: Aff - Purified State: Liquid purified Ig fraction.
Concentration	lot specific
Purification	Immunoaffinity chromatography.
Conjugation	Unconjugated
Storage Condition	Store the antibody (in aliquots) at -20°C. Avoid repeated freezing and thawing.
Gene Name	checkpoint kinase 2
Database Link	Entrez Gene 11200 Human UniProt ID O96017
Background	Chk2 is a serine/threonine kinase involved in the control of cell cycle checkpoints, and may also participate in transduction of the DNA damage and replicational stress signals. Chk2 is the mammalian ortholog of the budding yeast Rad53 and fission yeast Cds1 checkpoint kinases. The amino-terminal domain of Chk2 contains a series of seven serine and threonine residues (Ser19, Thr26, Ser28, Ser33, Ser35, Ser50 and Thr68) followed by glutamine (SQ or TQ motif). These are known to be preferred sites for phosphorylation by ATM/ATR kinases. Indeed, after DNA damage by ionizing radiation (IR), UV irradiation or hydroxyurea treatment, Thr68 and other sites in this region become phosphorylated by ATM/ATR. 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 on residues Thr383 and Thr387 in the activation loop of the kinase domain. Chk2 inhibits CDC25C phosphatase by phosphorylating it on Ser-216, preventing the entry into mitosis. This kinase may have a role in meiosis as well. Kinase activity is up regulated by autophosphorylation and the protein is rapidly phosphorylated in response to DNA damage and to replication block. Defects in Chk2 are associated with Li-Fraumeni syndrome (LFS); a highly penetrant familial cancer phenotype usually associated with inherited mutations in p53/TP53. Defects in Chk2 are also found in some patients with prostate cancer (CaP) or osteosarcoma (OSRC). Substantial amino acid variants exist in some cancer tissues. Numerous truncated splice variants exist for this protein.
Synonyms	CHEK2, CHEK-2, CHK-2, RAD53, Cds1
Reference Data

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