Opening Image: Ribbon model of human myoglobin. Myoglobin contains eight α helices, designated by the letters A through H, counting from the N-terminus. These helices provide a rigid structural framework for the heme pocket.
The heme group is shown in CPK colors. Choose between the following models:
In this tutorial you will learn how myoglobin binds oxygen. However, the mechanism of oxygen binding is identical in all myoglobins and hemoglobins. After a brief description of the tertiary structure of myoglobin, we will look at how the protein provides a pocket into which the O2 can fit. Finally, we will discuss what happens when the heme group binds oxygen.