Hi, little Einstein! My name is Actin I am a binding site for myosin heads Thats why I have so many arms and legs!
That is really cool! But why are you at an amusement park?
Well, i do you see that Ferris Wheel? That is really called The Myosin Ride. Those seats are are for me. My binding sites attach to the seats called myosin heads!
Well on all my filaments I have troponin, which is a protein that binds to the Calcium ions. This causes my complex to reconfigure and allows the myosin heads to be exposed. The The myosin head seats form cross bridges with my filaments! This results in a power stroke, allowing the Ferris Wheel to move, causing a contraction! Thanks for talking to me, I have to go on my ride now!
Oh WOW! How do you just bind to the myosin like that?