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Checkpoint kinase 1, commonly referred to as Chk1, is a serine/threonine-specific protein kinase that, in humans, is encoded by the CHEK1 gene. [5] [6] Chk1 coordinates the DNA damage response (DDR) and cell cycle checkpoint response. [7]
Serine/threonine-protein kinase PLK1, also known as polo-like kinase 1 (PLK-1) or serine/threonine-protein kinase 13 (STPK13), is an enzyme that in humans is encoded by the PLK1 (polo-like kinase 1) gene.
Serine/threonine-protein kinase PAK 2 is an enzyme that in humans is encoded by the PAK2 gene. [5] [6] PAK2 is one of three members of Group I PAK family of serine/threonine kinases. [7] [8] The PAKs are evolutionary conserved. [9] PAK2 and its cleaved fragment localize in both the cytoplasmic or nuclear compartments.
Serine (symbol Ser or S) [3] [4] is an α-amino acid that is used in the biosynthesis of proteins. It contains an α- amino group (which is in the protonated − NH + 3 form under biological conditions), a carboxyl group (which is in the deprotonated − COO −
CHEK2 (Checkpoint kinase 2) is a tumor suppressor gene that encodes the protein CHK2, a serine-threonine kinase. CHK2 is involved in DNA repair, cell cycle arrest or apoptosis in response to DNA damage. Mutations to the CHEK2 gene have been linked to a wide range of cancers. [5]
Serine/threonine-protein kinase PAK 1 is an enzyme that in humans is encoded by the PAK1 gene. [5] [6] PAK1 is one of six members of the PAK family of serine/threonine kinases which are broadly divided into group I (PAK1, PAK2 and PAK3) and group II (PAK4, PAK6 and PAK5/7). [7] [8] The PAKs are evolutionarily conserved. [9]
ATM serine/threonine kinase or Ataxia-telangiectasia mutated, symbol ATM, is a serine/threonine protein kinase that is recruited and activated by DNA double-strand breaks (canonical pathway), oxidative stress, topoisomerase cleavage complexes, splicing intermediates, R-loops and in some cases by single-strand DNA breaks. [5]
Serine/threonine protein kinases (EC 2.7.11.1) phosphorylate the OH group of serine or threonine (which have similar side chains). Activity of these protein kinases can be regulated by specific events (e.g., DNA damage), as well as numerous chemical signals, including cAMP/cGMP, diacylglycerol, and Ca 2+ /calmodulin.