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Analogues of atriopeptin(103-125)amide having high binding selectivity
K L Spear1, M S Brown, G M Olins
1Cardiovascular Diseases Research Department, Searle Research and Development Division, G. D. Searle and Company, Chesterfield, Missouri 63198.
Journal of Medicinal Chemistry
|May 1, 1989
Summary
Researchers modified atrial peptides, finding that changes to their structure affect binding to vasorelaxant (VR) receptors but not nonvasorelaxant (NVR) binding sites. This suggests VR receptors require specific ligand structures.
Area of Science:
- Biochemistry
- Peptide Chemistry
- Pharmacology
Background:
- Atrial natriuretic peptides (ANPs) are crucial in cardiovascular homeostasis.
- ANPs exert biological effects through specific receptor interactions.
- The structure-activity relationship of ANP binding to different receptor subclasses remains incompletely understood.
Purpose of the Study:
- To investigate the role of disulfide bridge positioning in atriopeptin analogues.
- To determine how conformational changes affect binding to vasorelaxant (VR) and nonvasorelaxant (NVR) binding sites.
- To elucidate the structural requirements for ANP binding to VR receptors.
Main Methods:
- Synthesis of atriopeptin(103-125)amide analogues with altered disulfide bridge positions.
- Radioligand binding assays to assess affinity for VR and NVR binding sites.
- Comparative analysis of binding affinities between natural and modified peptides.
Main Results:
- Conformationally perturbed analogues exhibited selective binding to either VR or NVR sites.
- Binding affinity to NVR sites was generally unaffected or improved.
- Affinity for VR sites significantly decreased in most analogues, with some showing undetectable binding.
- Data indicate that VR receptor binding necessitates rigid receptor/ligand interactions.
Conclusions:
- Disulfide bridge placement is critical for atrial peptide binding to vasorelaxant receptors.
- The nonvasorelaxant (NVR) binding sites demonstrate greater tolerance to structural modifications.
- Rigid structural features are essential for the interaction of atrial peptides with VR receptors, highlighting specific structure-activity relationships.