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. 1972 Sep;69(9):2566–2569. doi: 10.1073/pnas.69.9.2566

Method for Correlation of Proton Magnetic Resonance Assignments in Different Solvents: Conformational Transition of Oxytocin and Lysine Vasopressin from Dimethylsulfoxide to Water

J D Glickson *,‡, D W Urry *,‡, Roderich Walter *
PMCID: PMC426989  PMID: 4506776

Abstract

The peptide amide, primary carboxamide, and aromatic proton resonances were assigned to specific hydrogens of oxytocin and lysine vasopressin (Lys-VP) in water at 23° at pH 2.5 and 4.2, respectively. We started with the spectral assignments of oxytocin and Lys-VP determined in deuterated dimethylsulfoxide (Me2SO) and monitored the course of each of these resonances as the proportion of water to Me2SO was gradually increased. Changes in each of the two hormones in chemical shifts and in some coupling constants indicate that conformational alterations occur in both oxytocin and Lys-VP during the solvent transition from Me2SO to water. This study is a specific application of a general method for correlating spectral assignments in different solvents and for monitoring conformational changes accompanying solvent transitions. Application of this technique requires only that the solvent components be miscible over the entire transitional range, that spectral changes of the solute be simple enough to follow, and that the associated structural changes of the solute be “rapid on the proton magnetic resonance time-scale.”

Keywords: spectral assignments, neurohypophyseal hormones, solvent effects, amide proton resonances, three-dimensional structure

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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