Function
- Serine/threonine protein kinase 1 (Chk1) phosphorylates cdc25A, cdc25B and cdc25C. Upon phosphorylation, cdc25 binds adaptor protein and the cell is prevented from entering mitosis[1].
- Cyclin-dependent kinases
- Chk2 (Checkpoint kinase 2) phosphorylates cdc25C at Ser-216.
- Chk6 called also Aurora A is critical for the formation of mitotic spindles during cellular mitosis. Chk6 is phosphorylated at residues Thr287 and Thr288[2].
- Chk13 (Polo-like kinase 1 or Plk1) functions during the M phase of the cell cycle including the regulation of centrosome maturation and spindle assembly. Chk13 binds and phosphorylates proteins which are already phosphorylated on a motif recognized by its POLO-box domain (Pbd) at the C terminal. Human Chk13 contains catalytic domain (residues 13-345) and POLO-box domain (residues 345-603)[3].
- Glycogen synthase kinase 3 (GSK-3) is a serine/threonine protein kinase. GSK-3 is active in a number of intracellular signaling pathways. GSK-3 regulates glycogen synthase as well as other proteins. GSK-3 inhibition is studied as a therapeutic target in diseases like Alzheimer, diabetes, bipolar disorder and some cancers[5].
- B-Raf is related to retroviral oncogenes and participates in cellular signal transduction. B-Raf domains include the kinase domain - residues 444-721 and Ras-binding domain - residues 153-237. Mutated B-Raf was found in some human cancers[6].
See more in B-RAF with PLX4032; Mitogen-activated protein kinase cascade.
- Gcn2 (Generl Control Nonderepressible 2) senses amino acid deficiency by binding to uncharged tRNA[9].
- Protein kinase B (PKB), also known as Akt, is the collective name of a set of three serine/threonine-specific protein kinases that play key roles in multiple cellular processes such as glucose metabolism, apoptosis, cell proliferation, transcription, and cell migration. For example of ATK1 see 3mv5.
For details on Snf1-related kinase see
Structure of Anticancer Ruthenium Half-Sandwich Complex Bound to Glycogen Synthase Kinase 3ß [10]
A crystal structure of an bound to the protein kinase glycogen synthase kinase 3ß (GSK-3ß) has been determined and reveals that the inhibitor binds to the via an induced fit mechanism utlizing several and . Importantly, the metal is not involved in any direct interaction with the protein kinase but fulfills a purely structural role. The unique, bulky molecular structure of the half-sandwich complex with the CO-ligand oriented perpendicular to the pyridocarbazole heterocycle allows the complex to stretch the whole distance and to interact tightly with . Although this complex is a conventional ATP-competitive binder, the unique shape of the complex allows novel interactions with the glycine-rich loop which are crucial for binding potency and selectivity. It can be hypothesized that coordination spheres which present other ligands towards the glycine-rich loop might display completely different protein kinase selectivities.
3D structures of serine/threonine protein kinase
Serine/threonine protein kinase 3D structures