The conformation of angiotensin II. II. The rates of peptide NH exchange with solvent for [Asn1, Val5]angiotensin II, angiotensin III and saralasin

Robert E. Lenkinski, Richard L. Stephens, N. Rama Krishna

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

The amide hydrogen exchange rates in H2O of two angiotensin agonists (angiotensinamide and angiotensin III) and one angiotensin antagonist (saralasin) have been measured at room temperature by the transfer of solvent saturation method. The NH of His6 is observed to exchange more slowly than predicted for all three peptides, suggesting that it is a participant in an intramolecular hydrogen bond. The NH-CαH 1H-NMR coupling constants are measured and found to be constant over the pH range of 5.0 to 6.5. The results are compared with those previously obtained for human angiotensin II and interpreted in terms of a dominant three-dimensional structure common to all four molecules. Two models for this structure are evaluated using the observed NH-CαH coupling constants and the reported activity of conformationally restrained derivatives.

Original languageEnglish (US)
Pages (from-to)157-167
Number of pages11
JournalBBA - Protein Structure
Volume667
Issue number1
DOIs
StatePublished - Jan 30 1981

Keywords

  • Amide hydrogen exchange rate
  • Angiotensin
  • NMR
  • Saralasin

ASJC Scopus subject areas

  • Medicine(all)

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