Calcium/calmodulin-dependent protein kinase I is expressed in many tissues and is a component of a calmodulin-dependent protein kinase cascade. Calcium/calmodulin directly activates calcium/calmodulin-dependent protein kinase I by binding to the enzyme and indirectly promotes the phosphorylation and synergistic activation of the enzyme by calcium/calmodulin-dependent protein kinase I kinase.,CAMK1,CAMKI,Signal Transduction,ErbB-HER Signaling Pathway,Immunology & Inflammation,B Cell Receptor Signaling Pathway,Neuroscience,Calcium Signaling,Cardiovascular,Heart,Hypertrophy,CAMK1