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Isolation and characterization of rabbit gastrin.
R Jiang1, V D Huebner, T D Lee
1First Teaching Hospital of China Medical University, Peoples Republic of China.
Peptides
|July 1, 1988
Summary
Researchers purified and characterized rabbit gastrin-17, a peptide hormone. This study identified the complete amino acid sequence of rabbit gastrin, revealing a key difference from human gastrin.
Area of Science:
- Biochemistry
- Peptide Chemistry
- Gastroenterology
Background:
- Gastrin is a key peptide hormone regulating gastric acid secretion.
- Understanding gastrin structure across species aids in comparative physiology and drug development.
Purpose of the Study:
- To extract, purify, and determine the complete amino acid sequence of heptadecapeptide rabbit gastrin.
- To compare the structure of rabbit gastrin with human gastrin.
Main Methods:
- Extraction from rabbit antra.
- Purification using DEAE Sephadex, C-18 SEP PAK cartridges, fast performance liquid chromatography (FPLC), and reverse-phase high-performance liquid chromatography (HPLC).
- Structural confirmation via amino acid analysis, microsequence analysis, and mass spectrometry.
Main Results:
- A single, sharp peak of gastrin-like immunoreactivity was isolated.
- The amino acid sequence of rabbit gastrin was confirmed as pQGPWLQEEEEAYGWMDFamide.
- Rabbit gastrin-17 differs from human gastrin-17 by a glutamine at position 6 instead of glutamate.
- Both sulfated and unsulfated forms of rabbit gastrin-17 were identified.
Conclusions:
- The structure of rabbit gastrin-17 has been elucidated.
- Rabbit gastrin-17 shares high sequence homology with human gastrin-17, with a notable difference at position 6.
- This finding contributes to the understanding of gastrin evolution and function.