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Differences in the Ramachandran propensities of the N-terminal hairpin in Protein G and NuG2b. The dihedral angles of N8 and G9 in Protein G have high propensities for the nonnative type I′ turn, whereas K10 and T11 yield low propensities for the native type I turn. NuG2b eliminates the competition by removing the K10-T11 turn and allowing the N8-G9 pair to take advantage of their high propensity for a type I′ turn, which becomes the native turn in this designed protein.
