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The Exciton Model and the Circular Dichroism of Polypeptides
Authors:Robert W Woody
Institution:(1) Department of Biochemistry and Molecular Biology, Colorado State University, CO 80525 Fort Collins, USA
Abstract:Summary. Exciton coupling of the 190thinspnm pgrpgr* transition is an important factor in the CD spectrum of peptides and proteins. The CD spectrum of the agr-helix is dominated by the exciton effect. The spectrum is sensitive to the direction of the pgrpgr* transition dipole moment, especially for short helices. Exciton theory is much less successful in accounting for the CD spectrum of the poly(proline)II (PPII) conformation, an important conformer in collagen and in unordered peptides. Mixing of the pgrpgr* transition with high-energy transitions in the peptide backbone and in side chains must be considered to explain the strong negative CD band near 200thinspnm of PPII.
Keywords:, Circular dichroism, Helical structures, Peptides, Excitons, Transition moments,
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