Chk2, active, Recombinant, Human (Checkpoint Kinase 2, Rad 53)

Chk2 is rapidly phosphorylated and activated in response to replication blocks and DNA damage, the response to DNA damage occurs in an ataxia telangiectasia mutated (ATM)-dependent manner (1). Expression of wild-type Chk2 leads to increased p53 stabilization after DNA damage, whereas expression of a dominant-negative Chk2 mutant abrogated both phosphorylation of p53 on Serine 20 and p53 stabilization (2). Source: Recombinant full-length human Chk2 was expressed by baculovirus in Sf 9 insect cells using an N-terminal GST tag. The gene accession number is NM_007194. Molecular Mass: The approximate molecular weight is 88kD. Activity: The specific activity of Chk2 was determined to be 729 nmol/min/mg using a synthetic peptide substrate (KKKVSRSGLYRSPSMPENLNRPR). Storage: This product is stable at -70°C for at least 6 months from the date of receipt. For optimal storage, aliquot into smaller quantities after centrifugation and store at recommended temperature. Avoid repeated freeze-thaw cycles.