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Explain in brief the primary, secondary & tertiary structures of proteins with special reference to the bonds involved? |
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Answer» Primary structure: The linear sequence of amino acids in a polypeptide chain is the primary structure of protein. The first amino acid is called N-terminus and last amino acid is called C-terminus. Secondary structure: The polypeptide chains are coiled or folded in the form of helix. The structure is maintained by a series of regularly spaced intra or inter molecular hydrogen bonds formed between the amino acids of the same or different polypeptide chains. Such a conformation is termed as secondary structure. There are β types of secondary structure, α-helix, β-pleated and collagen helix. Tertiary structure: The helical polypeptide molecules further coiled to assume a complex but specific form is called tertiary structure. They are so arranged as to hide non-polar amino acid. |
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