Hemoglobin has a quaternary structure. It consists of two pairs of different proteins, designated the α and β chains. There are 141 and 146 amino acids in the α and β chains of hemoglobin, respectively. As in myoglobin, each subunit is linked covalently to a molecule of heme.

What protein structure is hemoglobin?

Hemoglobin is a complex protein which has a quaternary structure and contains iron. There are four subunits in the hemoglobin molecule - two alpha subunits and two beta subunits.

What is the structure and function of hemoglobin?

Hemoglobin is a protein made up of four amino acid chains. Each of these chains contains heme, a compound that contains iron and transports oxygen in the bloodstream. The pigment in hemoglobin is responsible for the red color of blood.