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Structural and functional characterization of elastases from horse neutrophils
1Department of Animal Biochemistry, Jagiellonian University, Kraków, Poland.
The Biochemical Journal
|June 1, 1994
Summary
Researchers characterized two horse neutrophil elastases (proteinases 2A and 2B) and found they closely resemble human counterparts. These findings implicate them in equine emphysema pathophysiology and connective tissue degradation.
Area of Science:
- Biochemistry
- Veterinary Medicine
- Pulmonology
Background:
- Equine emphysema pathophysiology requires understanding elastinolytic enzymes in horse neutrophils.
- Two such enzymes, proteinases 2A and 2B, were identified and characterized.
Purpose of the Study:
- To characterize equine neutrophil proteinases 2A and 2B.
- To compare these enzymes with human neutrophil proteinases (proteinase-3 and elastase).
- To investigate their role in equine lung disease.
Main Methods:
- Extensive characterization of proteinases 2A and 2B.
- Specificity studies using oxidized insulin B-chain and synthetic peptides.
- N-terminal sequence and reactive-site analyses.
- Comparison of inhibitor interactions with natural proteinase inhibitors.
Main Results:
- Proteinases 2A and 2B prefer cleavage at P1 alanine or valine residues.
- Significant sequence similarity was found between horse and human neutrophil elastases.
- Horse elastases showed differential inhibition by aprotinin variants compared to human elastase.
Conclusions:
- Horse neutrophil elastases (proteinases 2A and 2B) closely resemble human counterparts.
- These enzymes are implicated in the pathological degradation of connective tissue in equine chronic lung diseases.