Calcium-calmodulin-dependent protein kinase II subunit alpha (CaMKIIα)

Calcium-calmodulin-dependent protein kinase II subunit alpha (CaMKIIα) is a serine/threonine protein kinase highly enriched in the brain, especially at glutamatergic synapses, where it plays a central role in calcium signal decoding, synaptic plasticity, and memory formation. It is activated by calcium/calmodulin and can become autonomously active through autophosphorylation, acting as a molecular memory switch. CaMKIIα forms large multimeric complexes, interacts with scaffolding proteins, and regulates neurotransmitter release, excitatory synaptic transmission, and dendritic spine morphology. It also has roles in regulating transcription factors (e.g., FOXO3, ETS1), the JAK-STAT pathway, and cell proliferation in non-neuronal tissues. Mutations in the CAMK2A gene are associated with intellectual developmental disorders and neurodevelopmental phenotypes. Its versatile functions and essential roles in the nervous system make it a challenging but potentially important therapeutic target for neurological and psychiatric disorders, though no drugs directly targeting CaMKIIα are currently approved for clinical use.

Other names

CaMK-II alpha subunitCaM-kinase II alpha chainCaMKIIaCAMK2AKIAA0968calcium/calmodulin-dependent protein kinase type II alpha chainalpha-CaMKIICaMKIINalphacalcium/calmodulin-dependent protein kinase II alpha-B subunit

Inhibits autonomous kinase activity (currently, no clinically approved drugs; research compounds target inhibition of autophosphorylation or calmodulin binding)