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| Description: A sterically nonallowed conformation (a). The f = Oo and y = Oo conformation, is not allowed in any polypeptide chain because of the steric crowding between the carbonyl oxygen and amido proton. The atoms in a helix are closely packed as shown in the a-helix on the right from myoglobin. Picture Stats: Views: 319 Filesize: 185.67kB Height: 780 Width: 316 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=34088 |