As we’ve discussed, a peptide bond is made when amino group of one amino acid combines with the carboxylic acid group of another amino acid (releasing a water molecule in the process). The C-N bond formed in this process is called a peptide bond. Peptide bonds have a few properties that might be unexpected. b) Another observation is that although the N-H of the peptide bond is able to serve as a H-bond donor the N atom of the peptide bond does not serve as an effective H-bond acceptor. Provide an explanation for this observation, using Lewis structures, VSEPR theory and/or valence bond theory as appropriate. c) It is also fairly accepted that while proteins undergo dynamic motions and conformational changes, and while R groups can freely rotate about Cα, it is generally not possible to freely rotate around a peptide bond. Please explain this observation, using a picture showing relevant orbitals on relevant atoms (your answer for part (a) might provide a useful basis for your reasoning here).
As we’ve discussed, a peptide bond is made when amino group of one amino acid combines with the
b) Another observation is that although the N-H of the peptide bond is able to serve as a H-bond donor the N atom of the peptide bond does not serve as an effective H-bond acceptor. Provide an explanation for this observation, using Lewis structures, VSEPR theory and/or
c) It is also fairly accepted that while proteins undergo dynamic motions and conformational changes, and while R groups can freely rotate about Cα, it is generally not possible to freely rotate around a peptide bond. Please explain this observation, using a picture showing relevant orbitals on relevant atoms (your answer for part (a) might provide a useful basis for your reasoning here).
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