Human Insulin molecule — 360°
Insulin is the one of the most important hormones in the human body. This hormone is synthesized in the pancreatic β-cells within the islets of Langerhans and controls glucose uptake from the blood by cells of various organs and tissues.
Insulin is a small protein composed of two polypeptide chains. The A-chain (indicated by the dark shading) consists of 21 amino acid residues, and the B-chain (lighter shading) consists of 30 residues. The chains are connected by two disulfide bonds (the attached spheres on the model). One additional disulfide bond is located inside the A-chain. This model illustrates the structure of porcine insulin , which differs from human insulin  by one amino acid residue in the 30th position of the B-chain. Insulin is stored in the body as a hexamer, whereas the functional form of this hormone is monomeric [3, 4].
Date: Dec 10, 2011
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