[Secretion of proteolytic enzymes by three phytopathogenic microorganisms]
Prikladnaia Biokhimiia I Mikrobiologiia
|December 6, 2014
Summary
Phytopathogenic microorganisms like Phytophthora infestans, Rhizoctonia solani, and Fusarium culmorum secrete serine proteinases. Their secretion and type depend on phylogenetic position and environment, influencing fungal adaptation and survival.
Area of Science:
- Plant Pathology
- Microbiology
- Enzymology
Background:
- Phytopathogenic microorganisms cause significant potato diseases.
- Serine proteinases are crucial virulence factors in plant pathogens.
Purpose of the Study:
- To characterize serine proteinases from three distinct phytopathogenic microorganisms.
- To investigate the factors influencing serine proteinase secretion and function.
- To elucidate the role of these enzymes in pathogenesis and adaptation.
Main Methods:
- Enzyme characterization through substrate specificity and inhibitor sensitivity assays.
- Analysis of exoproteinase profiles.
- Phylogenetic analysis of the studied microorganisms.
- Culturing under varied nitrogen sources.
Main Results:
- Phytophthora infestans (oomycete), Rhizoctonia solani (basidiomycete), and Fusarium culmorum (ascomycete) secrete serine proteinases.
- Enzymes were identified as trypsin- and subtilisin-like proteinases.
- Secretion patterns correlated with culture medium composition, especially nitrogen source.
- Phylogenetic position influenced exoproteinase profiles, with F. culmorum and P. infestans showing similar sets despite distant relations.
Conclusions:
- Serine proteinase secretion is influenced by both phylogenetic relatedness and environmental factors.
- These enzymes likely play roles in host adaptation and survival in adverse conditions.
- Understanding these proteinases can inform strategies against potato diseases.
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