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Ragweed pollen proteolytic enzymes: possible roles in allergies and asthma
1Department of Biochemistry and Molecular Biology, University of Georgia, Athens 30605, USA.
Phytochemistry
|February 14, 1998
Summary
Ragweed pollen contains new serine peptidases with trypsin-like and chymotrypsin-like activities. These enzymes hydrolyze neuropeptides and affect proteins, potentially influencing respiratory and nasal inflammatory diseases.
Area of Science:
- Biochemistry
- Enzymology
- Allergen research
Background:
- Ragweed pollen is a common allergen associated with respiratory conditions.
- Serine peptidases play diverse roles in biological processes, including inflammation and protein regulation.
Purpose of the Study:
- To identify and characterize novel serine peptidases from ragweed pollen.
- To investigate the enzymatic activity and substrate specificity of these novel peptidases.
Main Methods:
- Enzyme purification and molecular mass determination.
- pH optimum and inhibitor specificity assays.
- Hydrolysis of synthetic substrates, neuropeptides, and protein substrates.
Main Results:
- Two novel serine peptidases were identified: a chymotrypsin-like enzyme (82 kDa) and a trypsin-like enzyme (80 kDa).
- Both enzymes exhibited optimal activity at pH 9.0 and were inhibited by specific serine protease inhibitors.
- They efficiently hydrolyzed neuropeptides like vasoactive intestinal peptide (VIP), substance P, atrial natriuretic peptide (ANP), and angiotensin 2 (ATII).
- The chymotrypsin-like enzyme inactivated alpha-1-proteinase inhibitor (alpha-1-PI).
Conclusions:
- Ragweed pollen harbors unique serine peptidases with significant enzymatic activity.
- These enzymes can degrade biologically active peptides, suggesting a role in modulating inflammatory responses in the respiratory tract and nasal passages.