What is quaternary structure of a protein, Biology

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Q. What is quaternary structure of a protein? Do all proteins have quaternary structure?

The quaternary protein structure is the spatial conformation due to interactions among polypeptide chains that form the protein.

Only those proteins made of two or more polypeptide chains have quaternary structure. hemoglobin (four chains), Insulin (two chains) and the immunoglobulins (four chains, antibodies) are some examples of protein having quaternary structure.


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