CaM-kinase II (CAMK2) is a prominent kinase in the central nervous system. ATP + L-seryl-[protein] = ADP + H(+) + O-phospho-L-seryl-[protein] ATP + L-threonyl-[protein] = ADP + H(+) + O-phospho-L-threonyl-[protein] Autophosphorylation of CAMK2 plays an important role in the regulation of the kinase activity. CAMK2 is composed of four different chains: alpha, beta, gamma, and delta. The different isoforms assemble into homo- or heteromultimeric holoenzymes composed of 8 to 12 subunits (By similarity). First detected at 18 hpf. At 24 hpf, expressed in discrete anterior locations and along either side of the midline. At 48 hpf, expression is predominantly in the forebrain, and then accumulates in the forebrain, hindbrain, and retinal epithelium at 72 hpf. Belongs to the protein kinase superfamily. CAMK Ser/Thr protein kinase family. CaMK subfamily.