Abstract
Measurements of 1H and 13C spin-lattice relaxation and 13C nuclear Overhauser enhancement factors are reported for dimethyl sulfoxide solutions of tetragastrin, a pharmacologically active tetrapeptide. The use of the dipolar formalism for predicting 1H and quaternary 13C relaxation rates is discussed. Furthermore, the prospect is opened for the use of quaternary 13C and 1H relaxation times to obtain information on the peptide torsion angles phi, psi, and chi in a way supplementing NMR coupling constant methods presently in use.
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