Circular dichroism spectra of N-DmI, R-DmI, and Biotin-N-DmI. A: Far-UV CD spectra. B: Near-UV CD spectra. CD spectra were recorded at a protein concentration of 20 and 140 μM in the far- and near-UV region, respectively. Inset: Far-UV CD spectra of the model compounds cysteine and Nα-acetyl-amide derivatives of Tyr, Phe, and Trp, as indicated. CD data for model compound solutions are expressed as molar ellipticity.