Synthetic decapeptide corresponding to ACTH-like sequence of the variable part of the heavy chain of immunoglobulin G1 Eu was studied by two-dimensional 1H-NMR spectroscopy (400 MHz). A complete assignment of signals in the peptide spectrum was made. The decapeptide was shown not to have any ordered spatial structure, and was characterized by a high extent of flexibility of the oligopeptide chain, except for the peptide bond with an N-terminal residue.
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