Amino acid sequences of ferredoxins from Scopolia japonica and Lycium chinense: their similarities to that of Datura arborea.

The complete amino acid sequences of [2Fe-2S] ferredoxins from Scopolia japonica and Lycium chinense have been determined by automated Edman degradation of the entire Cm-proteins and of the peptides obtained by enzymatic digestions. These two ferredoxins exhibited only 2-7 differences in the amino acid sequence when compared to the Datura-ferredoxins (D. stramonium, D. metel, and D. arborea), and especially only 2 or 3 differences compared to D. arborea. On the contrary, 8-19 differences were observed among the other solanaceous ferredoxins. This suggests that S. japonica and L. chinense are closely related taxonomically to Datura plants, especially to D. arborea.