CHEM237 Lecture Notes - Lecture 4: Coiled Coil, Keratin, Triosephosphate Isomerase

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This peptide bond can be in the cis or trans configuration remember the cardboard demonstration. The plan of each peptide bond shares one alpha carbon with the next peptide bond plane. The rotation angles of the two planes from the alpha carbon are referred to as theta and si. The rotation of these angles changes the relative position of the amide planes, but only some configurations are possible. Steric hindrance results in some configurations not being possible. Ramachandran plots were plots created to show all possible configurations of the two angles. The shaded areas are allowed (thus there is no steric hindrance). Most known protein structures fit into the allowed regions but peptide bonds to glycine or proline residues are sometimes found in un-allowed regions. This may be due to the small size of the glycine side chain and the ring.

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