Cell cycle events are regulated by the sequential activation and deactivation of cyclin dependent kinases (Cdks) and by proteolysis of cyclins. Chk1 and Chk2 are involved in these processes as regulators of Cdks. Chk1 and Chk2 both function as essential components in the G2-DNA damage checkpoint by phosphorylating CDC25C in response to DNA damage. CDC25A, CDC25B and CDC25C protein tyrosine phosphatases function as mitotic activators by dephosphorylating CDC2 p34 on regulatory tyrosine residues. Phosphorylation of CDC25C by Chk1 and 2 inhibits its phosphatase activity, thereby blocking mitosis. It has also been shown that Chk1 can phosphorylate Wee1 in vitro, providing evidence that the hyperphosphorylated form of Wee1, seen in cells delayed by Chk1 overexpression, is due to phosphorylation by Chk1.

Suitable for use in protein kinase assay. Other applications not tested.

Protein Kinase Assay: 100ng of CHK1, active to phosphorylate the biotinylated peptide.

Optimal dilutions to be determined by the researcher.

Lyophilized powder may be stored at 4°C for short-term only. Stable for 12 months at -20°C. Reconstitute to nominal volume (see reconstitution instructions for peptides) and store at -20°C. For maximum recovery of product, centrifuge the original vial prior to removing the cap. Further dilutions can be made in assay buffer.

Synthetic peptide

95+%, HPLC, Mass Spec

Supplied as a lyophilized powder.

This product as supplied is intended for research use only, not for use in human, therapeutic or diagnostic applications without the expressed written authorization of United States Biological.