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Solution structure of casokefamide
Biochemical and Biophysical Research Communications
|March 31, 1993
Summary
This study explored the structure of casokefamide, a synthetic peptide. Its unique conformation may explain its interaction with opioid receptors and effects on digestion.
Area of Science:
- Biochemistry
- Peptide Chemistry
- Pharmacology
Background:
- Casokefamide is a synthetic peptide derived from beta-casomorphin.
- It exhibits resistance to gastric proteases and binds to mu and delta-opioid receptors.
- Casokefamide influences gastric acid, pancreatic exocrine secretions, and gastrointestinal motility.
Purpose of the Study:
- To investigate the conformational properties of casokefamide.
- To understand the relationship between its structure and function, particularly its opioid receptor interactions.
Main Methods:
- Nuclear Magnetic Resonance (NMR) spectroscopy in a DMSOd6/H2O cryomixture at 265 K.
- Computational energy calculations.
Main Results:
- The predominant conformation of casokefamide lacks regular secondary structures and intramolecular hydrogen bonds.
- The conformation of the 'message domain' resembles that of various peptidic and non-peptidic opiates.
- The D-Ala2CH3 group is positioned between the Tyr1 and Phe3 aromatic rings.
Conclusions:
- The study elucidates the solution conformation of casokefamide.
- The determined structure provides insights into its opioid receptor binding and physiological effects.
- This conformational data is crucial for understanding casokefamide's pharmacological profile.