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(a) CD titration of Cy-AA-KK with [FeIII(coproporphyrinate I)]3- at 4°C. Aliquots of a metalloporphyrin solution (0.1 equivalent) were added until no change occurred in the negative signal at 222 nm. For clarity, only the spectra of the first seven aliquots are shown. Note that an isodichroic point occurs at ≈204 nm, again implying two-state solution behavior. (b) Binding isotherm showing saturation at 1 equivalent to bound porphyrin ([porphyrin] = 7 μM).
