Jun 1, 1976

The pH dependence of the conformation of angiotensin peptides by nuclear magnetic resonance: cis-trans isomerism of proline 7

R E GalardyL C Craig


The pH dependence of the proton NMR spectrum of [Asn1, Val5] angiotensin II in aqueous solution shows the existence of one major and one minor conformation above pH 6.5, the minor conformation representing 12 +/- 2% of the total peptide. A similar observation has been made for (Asn1, Val5) angiotensin I and Val-Tyr-Val-His-Pro-Phe. This effect is not due to the presence of angiotensin-like impurities in the peptide samples. We have shown two expected impurities, [beta-Asp1, Val5] angiotensin II and [Asn1, 3-Bzl-Ty4, Val5] - angiotensin II, to be absent, and a third impurity [Asn1, Val5, D-His6] angiostensin II, to be present at less than or equal to 2.1 mol%, too little to account for the observed amount (12 +/- 2%) of minor conformation. The carbon-13 spectrum of the hexapeptide at high pH shows that the major conformation has Pro7 in the trans form and the minor conformation has Pro7 in the cis form.

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Mentioned in this Paper

Molecular Stereochemistry
In Vivo NMR Spectroscopy
Magnetic Resonance Imaging
Structure-Activity Relationship
Angiotensin I Assay
Peptide Fragments
Protein Conformation
Angiotensin II, Val(5)-

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