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Eduncle posted an MCQ
December 27, 2019 • 21:46 pm 0 points
  • CSIR NET
  • Life Sciences

Which one of the following peptides can coexist in both cis- and trans- conformation ?

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    Eduncle Best Answer

    The peptide bond nearly always has the trans configuration since it is more favourable than cis, which is sometimes found to occur with proline residues. For proline residues, the cyclic nature of the side chain means that both cis and trans configurations have more equivalent energies. Thus proline is found in the cis configuration more frequently than other amino acids. The omega torsion angle of proline will be close to zero degrees for the cis configuration, or most often, 180 degrees for the trans configuration.

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