PKA phosphorylates Myosin Binding Protein-C (MyBP-C) and troponin I (TnI) within the cardiac myofibril. TnI may be the inhibitory component of the trimeric troponin molecule which makes up the Ca2+-change from the contractile equipment. TnI binds to TnC when Ca2+ is sure to TnC, although inside the absence of Ca2+, the C-terminus of TnI is introduc… Read More