Problem:
Question: Why is proline frequently encountered at the places in the myoglobin and hemoglobin molecules where the polypeptide chain turns a corner?
Pick all that apply
1. Proline fits well into a reverse turn between ?-strands.
2.Proline fits well into a reverse turn between ?-helix segments.
3.Proline, unlike the rest of the other amino acids, has a fixed angle between its ?-C-C bond and ?-C-N bonds.
4.Proline, due to its structure, cannot fit into the geometry of an ?-helix.
5.Proline, due to its structure, cannot fit into the geometry of a ?-sheet.
Any help would be greatly appreciated!