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Minigastrin; corrected structure and synthesis
Minigastrin is confirmed as the C-terminal tetradecapeptide amide of gastrin, not the tridecapeptide amide. This study details its synthesis and purification, confirming its full physiological activity.
Area of Science:
- Peptide Chemistry
- Gastroenterology
Background:
- Gastrin is a key hormone regulating gastric acid secretion.
- The exact structure of minigastrin, a biologically active fragment of gastrin, has been debated.
Purpose of the Study:
- To synthesize and characterize the C-terminal tetradecapeptide amide of gastrin (minigastrin).
- To resolve the structural discrepancy regarding minigastrin's length.
Main Methods:
- Solid-phase peptide synthesis utilizing fragment coupling with dicyclohexylcarbodiimide and N-hydroxysuccinimide/1-hydroxybenzotriazole.
- Purification of intermediates and final product using Sephadex LH-20 and ion-exchange chromatography.
- Deprotection using 90% trifluoroacetic acid with scavengers.
Main Results:
- Successful synthesis of the tetradecapeptide amide sequence: Trp-Leu-[Glu]5-Ala-Tyr-Gly-Trp-Met-Asp-Phe-NH2.
- Purification yielded a homogeneous tetradecapeptide amide.
- The synthesized minigastrin exhibited full physiological activity.
Conclusions:
- Minigastrin is definitively the C-terminal tetradecapeptide amide of gastrin.
- The synthetic methodology provides a reliable route for producing active minigastrin.
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