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Product Includes Quantity Applications Reactivity MW(kDa) Isotype
Phospho-Chk2 (Thr68) (C13C1) Rabbit mAb 2197 100 µl
Western Blotting Immunoprecipitation Immunohistochemistry Flow Cytometry
H 62 Rabbit IgG
Chk2 (D9C6) XP® Rabbit mAb 6334 100 µl
Western Blotting Immunoprecipitation Immunohistochemistry Immunofluorescence
H 62 Rabbit IgG

Product Description

PhosphoPlus® Duets from Cell Signaling Technology (CST) provide a means to assess protein activation status. Each Duet contains an activation-state and total protein antibody to your target of interest. These antibodies have been selected from CST's product offering based upon superior performance in specified applications.


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).


1.  Allen, J.B. et al. (1994) Genes Dev. 8, 2401-2415.

2.  Kastan, M.B. and Lim, D.S. (2000) Nat Rev Mol Cell Biol 1, 179-86.

3.  Weinert, T.A. et al. (1994) Genes Dev. 8, 652-665.

4.  Murakami, H. and Okayama, H. (1995) Nature 374, 817-819.

5.  Melchionna, R. et al. (2000) Nat. Cell Biol. 2, 762-765.

6.  Ahn, J.Y. et al. (2000) Cancer Res. 60, 5934-5936.

7.  Lee, C.H. and Chung, J.H. (2001) J. Biol. Chem. 276, 30537-30541.

8.  Matsuoka, S. et al. (2000) Proc Natl Acad Sci USA 97, 10389-94.


Entrez-Gene Id 11200
Swiss-Prot Acc. O96017


For Research Use Only. Not For Use In Diagnostic Procedures.
Cell Signaling Technology is a trademark of Cell Signaling Technology, Inc.
PhosphoPlus is a trademark of Cell Signaling Technology, Inc.
U.S. Patent No. 5,675,063.