beside a direct trigger of sarcomeric muscle contraction through binding of troponin c , calcium ions trigger or modulate contractility through calcium-calmodulin-dependent myosin light chain kinases , and increase the rate of relaxation through the calmodulin-dependent phosphorylation of phospholamban , the activator of the cardiac sarcoplasmic reticulum calcium pump .
C0027120
myosin light chain kinases
C0031715
phosphorylation