PKA phosphorylates Myosin Binding Protein-C (MyBP-C) and troponin I (TnI) in the cardiac myofibril. TnI would be the inhibitory component from the trimeric troponin molecule which makes up the Ca2+-switch with the contractile apparatus. TnI binds to TnC when Ca2+ is certain to TnC, while in the absence of Ca2+, https://johnf443rcm6.blogaritma.com/profile