(A) CD spectra of 42 μM DD K in 100 mM NaCl, 20 mM phosphate buffer, pH 7 (dash, dot-dot), and after addition of 200 μM SDS (dash, dot) or 1 mM SDS (solid line). (B) CD spectra of 42 μM DD K in the presence of 200 μM DPC (dash, dot-dot), 400 μM DPC (solid line), 1 mM DPC (dash-dash), or 3 mM DPC (dash, dot). (C) CD spectra of 55 μM DD K in water (solid light line), 10% TFE (dash, dot-dot), 20% TFE (dash, dot), 30% TFE (dash, dot-dot-dot), and 60% TFE (solid black line). (D) CD spectra of 40 μM DD K in from (top to bottom) 10 μM POPG in the form of small unilamellar vesicles (dash, dot-dot), 20 μM POPG (solid line), 50 μM POPG (dash, dot), 100 μM POPG (dash-dash), and 200 μM POPG (dash, dot-dot).