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Trypsin-like proteinase and its endogenous inhibitor from Yersinia pseudotuberculosis. Biological activity
1Pacific Institute of Bioorganic Chemistry, Far Eastern Branch of the Russian Academy of Sciences, Vladivostok, 690022, Russia. elyakov@piboc.marine.su
Abstract:
A trypsin-like proteinase (YPTP) and its endogenous inhibitor (ITYP) were isolated from the culture filtrate of the pathogenic bacterium Yersinia pseudotuberculosis, and their biological activities were studied. YPTP was found to be highly toxic for random-bred white mice. Under in vitro conditions the proteolytic enzyme destroyed protective proteins of the immune system of the animals--IgG, IgA, and proteins of the complement system (CIq, C3, and C5)--and, consequently, was a pathogenetic factor in yersinioses. The inhibitor ITYP was shown to manifest antibacterial activity against virulent forms of Yersinia pseudotuberculosis, Escherichia coli, and Salmonella typhimurium. The ITYP preparation was harmless and nontoxic.
Insights
A novel trypsin-like proteinase (YPTP) from Yersinia pseudotuberculosis is toxic and degrades immune proteins, contributing to yersinioses. Its inhibitor (ITYP) shows antibacterial activity against virulent bacteria.
Area of Science:
- Microbiology
- Immunology
- Bacterial Pathogenesis
Background:
- Yersinia pseudotuberculosis is a pathogenic bacterium causing yersinioses.
- Understanding bacterial virulence factors and host immune evasion mechanisms is crucial.
Purpose of the Study:
- To isolate and characterize a trypsin-like proteinase (YPTP) and its inhibitor (ITYP) from Yersinia pseudotuberculosis.
- To investigate the biological activities and pathogenic roles of YPTP and ITYP.
Main Methods:
- Isolation of YPTP and ITYP from bacterial culture filtrate.
- In vitro assays to assess YPTP's proteolytic activity on immune proteins (IgG, IgA, complement components).
- In vitro assays to evaluate ITYP's antibacterial activity against various bacterial strains.
Main Results:
- YPTP exhibited high toxicity in mice and degraded key immune proteins (IgG, IgA, C1q, C3, C5) in vitro.
- Degradation of immune proteins by YPTP was identified as a pathogenetic factor in yersinioses.
- ITYP demonstrated significant antibacterial activity against virulent Yersinia pseudotuberculosis, Escherichia coli, and Salmonella typhimurium.
- ITYP preparations were found to be harmless and non-toxic.
Conclusions:
- YPTP is a virulence factor of Yersinia pseudotuberculosis, contributing to disease by evading the host immune system.
- ITYP represents a potential therapeutic agent with broad-spectrum antibacterial activity against relevant pathogens.