CaMKII is a member of calcium/calmodulin-activated kinase, functioning in neural synaptic stimulation and T-cell receptor signaling. CaMKII has catalytic and regulatory domains. The binding of Ca++/calmodulin to its regulatory domain releases its autoinhibitory effect and activates the kinase. The activated CaMKII further autophosphorylates itself at Thr286 to render the kinase constitutively active.