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Circular dichroism spectra have been obtained for cationic poly(L‐arginine) and poly(L‐histidine) in aqueous solutions containing varying amounts of sodium dodecyl sulfate. The detergent induces a disorder‐order transition in both polypeptides. In each case the transition is cooperative and occurs when the ratio of detergent to amino acid residue is near unity. The ordered structure formed by poly(L‐arginine) is readily identifiable as an α helix. Poly(L‐histidine) appears to form a β structure in which the 211‐nm electronic absorption band of the imidazole group exhibits significant rotatory strength.
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McCord et al. (1977) studied this question.
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