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Dog mast cell chymase: molecular cloning and characterization
G H Caughey1, W W Raymond, P Vanderslice
1Cardiovascular Research Institute, University of California, San Francisco 94143.
Biochemistry
|May 29, 1990
Summary
Researchers cloned and characterized dog mast cell chymase, revealing its complete amino acid sequence. This enzyme shares similarities with rat chymases but differs from dog mast cell tryptase, suggesting distinct activation mechanisms.
Area of Science:
- Biochemistry
- Molecular Biology
- Enzymology
Background:
- Mast cell chymases are proteases involved in various physiological and pathological processes.
- Understanding the structure and function of these enzymes is crucial for developing targeted therapies.
Purpose of the Study:
- To clone and characterize the complete amino acid sequence of dog mast cell chymase.
- To compare its structure with related proteases and elucidate its evolutionary relationships.
Main Methods:
- Screening of a dog mastocytoma cDNA library using an oligonucleotide probe.
- Deduction of amino acid sequence from the cloned cDNA.
- Bioinformatic analysis and comparison with known proteases.
Main Results:
- The complete amino acid sequence of dog mast cell chymase was determined, revealing a prepropeptide and a catalytic domain.
- Dog chymase shares structural features with rat mast cell chymases and neutrophil cathepsin G.
- It differs from dog mast cell tryptase, indicating distinct activation pathways.
Conclusions:
- Dog mast cell chymase is a distinct serine protease with unique structural characteristics.
- Its structural differences from tryptase suggest divergent evolutionary paths and activation mechanisms.