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Quaternary structure results from the aggregation of two or more polypeptide subunits

Quaternary structure results from the aggregation of two or more polypeptide subunits

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Quaternary structure  results from the aggregation of two or more polypeptide subunits. Collagen is a fibrous protein of three polypeptides that are supercoiled like a rope. This provides structural strength for collagen’s role in connective tissue. Hemoglobin is a globular protein with quaternary structure. It consists of four polypeptide subunits: two alpha and two beta chains. Both types of subunits consist primarily of alpha-helical secondary structure. Each subunit has a nonpeptide heme component with an iron atom that binds oxygen. What are the key factors determining protein conformation? A polypeptide chain of a given amino acid sequence can spontaneously arrange itself into a  3D shape determined and maintained by the interactions responsible for secondary and  tertiary structure.
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Quaternary structure results from the aggregation of two or more polypeptide subunits

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