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Helicobacter pylori urease: properties and role in pathogenesis
H L Mobley1, L T Hu, P A Foxal
1Dept. of Medicine, University of Maryland School of Medicine, Baltimore 21201.
Scandinavian Journal of Gastroenterology. Supplement
|January 1, 1991
Summary
Helicobacter pylori urease is crucial for its survival in the stomach and causes gastritis. Its unique structure and conserved sequences are key to understanding its role in pathogenesis and developing diagnostic tests.
Area of Science:
- Enzymology
- Microbiology
- Molecular Biology
Background:
- Urease (urea amidohydrolase) catalyzes urea hydrolysis, producing ammonia and carbon dioxide.
- Helicobacter pylori urease is vital for its survival in the acidic gastric environment and pathogenesis of gastritis.
- Urease activity is the basis for diagnostic tests like the urease biopsy test and urea breath test.
Purpose of the Study:
- To investigate the molecular biology and structure of Helicobacter pylori urease.
- To understand the role of urease in H. pylori pathogenesis and host immune response.
Main Methods:
- Purification of the high molecular weight urease protein.
- Analysis of urease subunit structure and amino acid sequences.
- Cloning, sequencing, and polymerase chain reaction amplification of urease genes.
Main Results:
- H. pylori urease has a unique subunit structure (29.5 kDa and 66 kDa) compared to other microbial ureases.
- Amino acid sequences of H. pylori urease are conserved among bacterial ureases and jack bean urease.
- Urease plays a central role in H. pylori pathogenesis, enabling survival and causing cytotoxic effects.
Conclusions:
- H. pylori urease is a significant virulence factor and a target for diagnostic strategies.
- Understanding urease's molecular biology provides insights into H. pylori infection and disease.
- Further research on urease can lead to novel therapeutic approaches.