13 C n.m.r. study of l‐alanine peptides

ALOK K. MITRA, IOSIF OSTASHEVSKY, CURTIS F. BREWER

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

The di‐, tri, and tetrapeptides of l‐alanine have been studied in aqueous solution by 13C n.m.r. spectroscopy at 25 and 50 MHz. By using selectively 13C enriched analogs containing either 90% 13C methyl or carbonyl carbons and measurements as a function of pH, assignment of the chemical shifts of the peptides has been made. T1 and NOE measurements of the peptides in their cationic, anionic, and zwitterionic states have been recorded as a function of concentration. The results show considerable segmental motion along the backbone carbons of the peptides, with only small changes occurring in the dynamic motions of the peptides as their charge states are altered. The lack of concentration dependence of the chemical shift and T1 values, as well as the similarity of T1 values for individual peptides in the three charge states, indicate that the peptides do not self‐associate in aqueous solution.

Original languageEnglish (US)
Pages (from-to)502-508
Number of pages7
JournalInternational Journal of Peptide and Protein Research
Volume22
Issue number4
DOIs
StatePublished - Oct 1983

Keywords

  • 13C chemical shifts
  • L‐alanine oligopeptides
  • T 1 measurements

ASJC Scopus subject areas

  • Biochemistry

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