Abstract
The fungal plant pathogen Rhizoctonia solani Kuhn. grown in a medium containing thermostable potato tuber proteins produced proteinases active at moderately alkaline pH values. Electrophoretic analysis in polyacrylamide gel with SDS and copolymerized gelatin showed that the extracellular proteinase complex contained four components that differed in molecular weight. Studies on the action of the exoenzymes on various synthetic substrates indicated that the culture liquid of R. solani contained mainly trypsin-like proteinases. The exoproteinase activity was virtually completely suppressed by trypsin inhibitor proteins isolated from potato tubers and seeds of various legume species. The results suggest that the extracellular proteinases produced by R. solani play a significant role in attacking plant tissue, and natural inhibitors contribute to the protection of Solanaceae and Leguminosae from this fungal pathogen.
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Original Russian Text © E.L. Gvozdeva, A.V. Volotskaya, A.V. Sof’in, N.N. Kudryavtseva, T.A. Revina, TA. Valueva, 2006, published in Prikladnaya Biokhimiya i Mikrobiologiya, 2006, Vol. 42, No. 5, pp. 572–579.
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Gvozdeva, E.L., Volotskaya, A.V., Sof’in, A.V. et al. Interaction of proteinases secreted by the fungal plant pathogen Rhizoctonia solani with natural proteinase inhibitors produced by plants. Appl Biochem Microbiol 42, 502–507 (2006). https://doi.org/10.1134/S0003683806050103
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DOI: https://doi.org/10.1134/S0003683806050103