VCD Robustness of the Amide-I and Amide-II Vibrational Modes of Small Peptide Models

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Abstract

The rotational strengths and the robustness values of amide-I and amide-II vibrational modes of For(AA)nNHMe (where AA is Val, Asn, Asp, or Cys, n=1-5 for Val and Asn; n=1 for Asp and Cys) model peptides with α-helix and β-sheet backbone conformations were computed by density functional methods. The robustness results verify empirical rules drawn from experiments and from computed rotational strengths linking amide-I and amide-II patterns in the vibrational circular dichroism (VCD) spectra of peptides with their backbone structures. For peptides with at least three residues (n≥3) these characteristic patterns from coupled amide vibrational modes have robust signatures. For shorter peptide models many vibrational modes are nonrobust, and the robust modes can be dependent on the residues or on their side chain conformations in addition to backbone conformations. These robust VCD bands, however, provide information for the detailed structural analysis of these smaller systems. Chirality 27:625-634, 2015

Original languageEnglish
Pages (from-to)625-634
Number of pages10
JournalChirality
Volume27
Issue number9
DOIs
Publication statusPublished - Sep 1 2015

Keywords

  • VCD robustness
  • VCD spectroscopy
  • amide-I and amide-II vibrational modes of peptides
  • chiroptical spectroscopy
  • model peptides
  • peptide structure

ASJC Scopus subject areas

  • Analytical Chemistry
  • Catalysis
  • Pharmacology
  • Drug Discovery
  • Spectroscopy
  • Organic Chemistry

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