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The Heme Group. In hemoglobin, each subunit contains a heme group, which is displayed using the ball-and-stick representation in Figure 2. Each heme group contains an iron atom that is able to bind to one oxygen (O 2) molecule. Therefore, each hemoglobin protein can bind four oxygen molecules. One of the most important classes of chelating agents in nature are the porphyrins.
For one the protein has only one binding site for oxygen on the one heme group on the protein. While myoglobin can only hold one oxygen, the affinity for that oxygen is very high compared to hemoglobin.This is likely due to the fact that hemoglobin, transporting 4 oxygens to the tissues and muscles where myoglobin is mostly present.hile myoglobin can only hold one oxygen, the affinity for that oxygen is very high compared to hemoglobin. This is likely due to the fact that hemoglobin, transporting 4 oxygens to the tissues and muscles where myoglobin is mostly present.