Catalytic activity:ATP + a protein = ADP + a phosphoprotein. ,Domain:The autoinhibitory domain overlaps with the calmodulin binding region and may be involved in intrasteric autoinhibition. ,Domain:The RP domain (arginine/proline-rich) is involved in the recognition of CAMKI and CAMK4 as substrates. ,enzyme regulation:Activated by Ca (2+) /calmodulin. Binding of calmodulin may releave intrasteric autoinhibition. Autophosphorylation does not alter activity or regulation by Ca (2+) /calmodulin. In part , activity is independent on Ca (2+) /calmodulin. ,Function:Calcium/calmodulin-dependent protein kinase belonging to a proposed calcium-triggered signaling cascade involved in a number of cellular processes. Isoform 1 , isoform 2 and isoform 3 phosphorylate CAMK1 and CAMK4. Isoform 3 phosphorylates CAMK1D. Isoform 4 , isoform 5 and isoform 6 lacking part of the calmodulin-binding domain are inactive. Seems to be involved in hippocampal activation of CREB1. ,PTM:Autophosphorylated. ,sequence Caution:Intron retention. ,similarity:Belongs to the protein kinase superfamily. Ser/Thr protein kinase family. ,similarity:Contains 1 protein kinase domain. ,subunit:Interacts with calmodulin. ,tissue specificity:Ubiquitously expressed with higher levels in the brain. Intermediate levels are detected in spleen , prostate , thyroid and leukocytes. The lowest level is in lung. ,
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