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High-field n.m.r. studies were undertaken upon a peptide fragment of the C-terminal region of human beta-calcitonin-gene-related peptide (beta-hCGRP). Studies on the antigenic [Bu(t)-Cys18]beta-hCGRP-(19-37)-fragment revealed that several elements of secondary structure were present when the peptide was dissolved in [2H6]dimethyl sulphoxide. In particular an unspecified turn in the region of Ser19-Gly20 and a type I beta-turn in the region of Asn31-Val32-Gly33 were identified. Through-space connections between the terminal Phe37 amide group and the beta-protons of Thr50 suggest that the peptide may be folded into a loop-type conformation. These structural elements appear to overlap with the epitopes of a number of monoclonal antibodies and provide a molecular basis for understanding the role of the terminal Phe37 amide residue in the immune recognition of beta-hCGRP.

Structural studies on the [But-Cys18](19-37)-fragment of human β-calcitonin-gene-related peptide