Myoglobin (Mb) is a structurally complex molecule that binds and stores oxygen inside of skeletal and cardiac muscles cells. We have developed a multiweek laboratory project in which students isolate myoglobin and characterize its structure, function, and redox state. The atomic structure of myoglobin has been known since , when John Kendrew We first turn our attention to the structure and function of myogloblin.


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The heme group gives muscle and blood their distinctive red color. The prosthetic heme group binds to proximal histidine group while a distal histidine group interact on the other side of the plane in the structure.

Structural Biochemistry/Protein function/Heme group/Myoglobin

Myoglobin without its heme prosthetic group is designated apomyoglobin. The main function of apomyoglobin is to provide a hydrophobic environment for the heme group.


When muscle tissue is damaged, very large concentrations of myoglobin enters the kidneys. When this happens, myoglobin is then considered highly toxic and may contribute to acute renal failure.

Muscle injury is commonly associated with the release of myoglobin, and is known to be myoglobin structure and function cause of heart attacks and many other myoalgia.

History[ edit ] Myoglobin was the first protein whose structure was determined.

Myoglobin Structure and Function

Four years later, they both received the Nobel Prize in chemistry for this innovation. Structure[ edit ] Myoglobin Binding Curve Myoglobin is a monomeric protein that has myoglobin structure and function acids residues.

It has a globular structure. Myoglobin contains a heme prosthetic group which is responsible for its main function carrying of oxygen molecules to muscle tissues. Myoglobin can exist in the oxygen free form, deoxymyoglobin, or in a form in which the oxygen myoglobin structure and function is bound, called oxymyoglobin.

Myoglobin is a protein found in muscles that binds oxygen with its heme group like hemoglobin. Heme group consists of protoporphyrin organic component and an iron atom located in its center.

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The heme group gives muscle and blood their distinctive red color. The organic component consists of four pyrrole rings that are linked by methine bridges. In addition, heme is responsible for the red color of the blood and muscle. myoglobin structure and function

What is Myoglobin? What is the function of Myoglobin?

At the center of protporphyrin, the iron atom is bonded to nitrogen atoms from four pyrrole rings. The iron atom can form two additional bonds, one on each side of the heme plane.

These binding sites are called the fifth and sixth coordination sites. Myoglobin structure and function myoglobin, the fifth coordination site is occupied by the imidazole ring from a histidine residue on the protein. This hisitidine is referred to as the proximal histidine.

Myoglobin - Wikipedia

The sixth coordination site is available to bind oxygen. Meat color[ edit ] Myoglobin contains hemes, pigments responsible for the colour of red meat.

The colour that meat takes is partly determined by the degree of oxidation of the myoglobin. If meat has been exposed to nitritesit will myoglobin structure and function pink because the iron atom is bound to NO, nitric oxide true of, e.