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A detailed analysis of polypeptide-chain backbone conformations was carried out for polypeptide-chain segments adjacent to β-turn regions, including the sites of disallowed conformations. A cross comparison of conformations was performed for disallowed regions of the Ramachandran plot and main types of β-turns and adjacent secondary structures. Based on the results, disallowed region 2 (II, II') in...
A comprehensive conformational analysis has been performed of β-turns containing an amino acid with a disallowed conformation of the polypeptide chain backbone. The first residue of the β-turn (Asn47) of the distal β-hairpin in the α-spectrin SH3 domain is characterized by a sterically disallowed back-bone conformation, with values of dihedral angles Φ and ψ being in the right bottom quadrant of the...
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