NMR and CD conformational studies of bradykinin and its agonists and antagonists: application to receptor binding
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Abstract
Most physiological processes are regulated by peptides that perform their functions by interacting with specific receptors on cells. Specific conformations of the peptides are required for correct interactions to take place, and a knowledge of the biologically important conformation is vital for the understanding of biological function. Over the last few years extensive studies using nuclear magnetic resonance and circular dichroism have been carried out on bradykinin (Arg 1 -Pro 2 -Pro 3 -Gly 4 -Phe 5 -Ser 6 -Pro 7 -Phe 8 -Arg 9 ) and its antagonists with the objective of developing new drugs to combat severe pathologies associated with its production. In the present review, these techniques for the determination of peptide conformation are reviewed and applied to the study of bradykinin and its antagonists. Modeling of these conformational data in the presence of the B 2 receptor or an antibody allows the biologically active conformations to be deduced and these are presented in this review.Key words: bradykinin antagonists, conformational analysis, NMR, CD, B 2 receptor binding.
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