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Question

Write a brief remark on protein main structure.


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Solution

Biomolecules:

  • The organic molecules which are produced in or by the living organisms are termed biomolecules.
  • A protein is an exceedingly complex natural molecule made up of amino acid residues linked by peptide bonds.
  • Proteins are found in all living species and contain a variety of biologically important molecules such as enzymes, hormones, and antibodies.

Primary Structure of Protein:

  • Because of their partly double-bond character, peptide -C=N- bonds are unable to rotate freely. As a result, the six atoms of the peptide bond are in a single plane, with the carbonyl group's oxygen atom and the amide nitrogen's hydrogen atom trans to each other.
  • The structure of a peptide bond is stiff and flat.
  • The polypeptide chain is made up of a sequence of rigid planes, each of which has a common point of rotation at -C.
  • The bond angles resulting from rotations are labeled (phi) for the N-C bond and (psi) for the C-C bond, according to the convention.


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