Chk2 (phospho T26), p-Chk2 (phospho T26), bA444G7, CHK2 checkpoint homolog, CHK2_HUMAN, Serine/threonine-protein kinase Chk2, CDS 1, CDS1, Checkpoint kinase 2, Checkpoint like protein CHK2, Chek 2, Chek2, Chk 2, CHK2 checkpoint homolog (S. pombe), CHK2 checkpoint homolog, HuCds 1, HuCds1, LFS 2, LFS2, PP1425, RAD 53, RAD53, Rad53 homolog, Serine/threonine protein kinase Chk2.
Regulates cell cycle checkpoints and apoptosis in response to DNA damage, particularly to DNA double-strand breaks. Inhibits CDC25C phosphatase by phosphorylation on Ser-216, preventing the entry into mitosis. May also play a role in meiosis. Regulates the TP53 tumor suppressor through phosphorylation at Thr-18 and Ser-20.