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Overlay of 1H-15N HSQC spectra of pWTUb and UbL50E at pH 4 (upper panel). The extensive peak overlap indicates that the two proteins have similar conformations. At pH 7.8, UbL50E has sharp and well-dispersed peaks, although with fewer resonances than at pH 4 (lower panel). The four peaks (blue circles) observable at pH 4 but not pH 5, are attributed to the four unassigned residues on β5.
