title: Release of cell-bound polygalacturonase and cellulase from mycelium of Rhizoctonia solani.
abstract: Propagules of Rhizoctonia solani grown in modified Czapek's medium containing sodium polypectate or carboxymethyl cellulose as a sole carbon source produced both extracellular and cell-bound polygalacturonase (PG), and cellulase (Cx), respectively. The cell-bound enzymes can be released to various extents by shaking the germinating propagules in solutions of NaCl, KCl, phosphate buffer, Na2EDTA (ethylenediaminetetraacetate), detergents such as Triton X-100 (octyl phenoxypolyethoxyethanol), Tween 80 (polyoxyethylene sorbitan monooleate), Celmusol, and distilled water. Sodium dodecyl sulfate (SDS) inactivated both PG and Cx but did no affect Cx activity in phosphate buffer solution. PG was more easily released by salts from the mycelium of R. solani than Cx. The release of both enzymes was a passive process and was not due to an osmotic effect. The amount of the cell-bound fraction was correlated with the total amount of the extracellular fraction rather than with the mycelial growth. At least one-third of the cell-bound fractions of both enzymes was found to be associated with the cell wall fraction of the mycelium.
mesh_terms: D002473:Cell Wall / Q000201:enzymology; D002480:Cellulase / Q000302:isolation & purification* / Q000378:metabolism; D004492:Edetic Acid / Q000494:pharmacology; D006026:Glycoside Hydrolases / Q000302:isolation & purification* / Q000378:metabolism; D008623:Mercaptoethanol / Q000494:pharmacology; D003904:Mitosporic Fungi / Q000201:enzymology* / Q000254:growth & development; D010710:Phosphates / Q000494:pharmacology; D011092:Polyethylene Glycols / Q000494:pharmacology; D011136:Polysorbates / Q000494:pharmacology; D011189:Potassium Chloride / Q000494:pharmacology; D012965:Sodium Chloride / Q000494:pharmacology; D012967:Sodium Dodecyl Sulfate / Q000494:pharmacology; D014574:Uronic Acids
chemical_list: D010710:Phosphates; D011136:Polysorbates; D014574:Uronic Acids; D012967:Sodium Dodecyl Sulfate; D011092:Polyethylene Glycols; D012965:Sodium Chloride; D008623:Mercaptoethanol; D011189:Potassium Chloride; D004492:Edetic Acid; D006026:Glycoside Hydrolases; D002480:Cellulase