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Solution conformation of CCK9, a cholecystokinin analog
Biochemical and Biophysical Research Communications
|February 15, 1993
Summary
This study reveals the predominant conformation of a stable cholecystokinin (CCK9) analog using NMR. The findings detail its gamma-turn and helical structure, crucial for understanding CCK
Area of Science:
- Biochemistry
- Neuroscience
- Structural Biology
Background:
- Cholecystokinin (CCK) is a peptide hormone with critical roles in the central and peripheral nervous systems.
- Previous research focused on the C-terminal octapeptide fragment (CCK8), the shortest circulating form.
Purpose of the Study:
- To perform a detailed NMR conformational study of the CCK analog CCK9.
- To characterize the stable conformation of CCK9 in a DMSOd6/H2O cryomixture at 278 K.
Main Methods:
- Nuclear Magnetic Resonance (NMR) spectroscopy.
- Conformational analysis in a DMSOd6/H2O cryomixture at 278 K.
Main Results:
- The predominant conformation of CCK9 features a gamma-turn centered on Thr4.
- A helical segment comprising C-terminal residues follows the gamma-turn, separated by Gly5.
- CCK9 demonstrates enhanced stability in acidic media and resistance to air oxidation compared to CCK8.
Conclusions:
- The study elucidates the specific three-dimensional structure of the stable CCK9 analog.
- Understanding CCK9's conformation provides insights into its biological activities and stability.
- The findings contribute to the structural understanding of peptide hormones and their analogs.