Comments on the use of a dichromophoric circular dichroism assay for the identification of β-turns in peptides

J. E. Baldwin, T. D W Claridge, Christopher Hulme, A. Rodger, C. J. Schofield

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Use of the dichromophoric CD assay for β-turn formation in peptide sequences has been investigated. The assay involves the observation of Cotton effects in CD spectra, originating from the approach of N- and C-terminal aromatic chromophores in tetrapeptides. The approach of the chromophores was believed to be brought about by a β-turn in the peptide structure. Our investigations were paralleled by NMR studies which revealed the presence of a previously unreported hydrogen bond in the β-turn conformers, which appears to play a role in the generation of the observed Cotton effects. This suggests caution in the use of the CD technique alone as an assay for β- turn conformers in peptides.

Original languageEnglish (US)
Pages (from-to)180-184
Number of pages5
JournalInternational Journal of Peptide and Protein Research
Issue number2
Publication statusPublished - 1994
Externally publishedYes


ASJC Scopus subject areas

  • Biochemistry

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