The arrangement of the peptide bonds in a polypeptide can havve a strong effect on the...

The arrangement of the peptide bonds in a polypeptide can havve a strong effect on the dipole moment in the secindary structure.

a. since the peptide bonds are the main contributors in the alpha helix, what is the direction of the dipole?

b. would Glu or Asp amino acid at the N terminus matter for the stability of an alpha helix segment? why or why not? (hint: think about electrostatic stabilization)

c. are there any amino acids that would stabilize an alpha helix if they were placed at the C terminus? what are they and why would they matter?

d. H bonds also have a dipole moment, but they have a lesser contribution to the alpha helix dipole moment than do the peptide bonds. why would that be?

e. draw the arrangement of the backbone atoms for an anti-parallel beta sheet-two strands of 4 amino acids long each and indicate the dipole moments of the peptide binds. will an anti-parallel beta sheet have a dipole moment: why or why not?

f. draw the arrangement of the backbone atoms for a parallel beta sheet-two strands of 4 amino acids long each and indicate the dipole moments of the peptide bonds. will an parallel beta sheet have a dipole moment: why or why not?

g. will H-bonds contribute to a dipole moment in an anti-parallel or parallel beta sheets? why or why not?

Expert Solution

gladiator answered 2 years ago

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