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Mutation of Glu residues to Ala extends the N-terminal α-helix of p6. Chemical shift differences (ppm) of the α-protons between the experimental values and those for residues in a random coil for p6 wt [50] compared with the E0A mutant in 50% aqueous TFE-D2 at pH 3 at 300 K. All positive values for N-terminal residues adjacent to proline residues arise from an inherent effect of proline and not out of a structural perturbation, as described in ref. [62].
