Purification and characterization of two isozymes of polygalacturonase from Botrytis cinerea. Effect of calcium ions on polygalacturonase activity |
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Authors: | Charlotte Cabanne Bernard Donche |
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Institution: | aLaboratoire de Biochimie Végétale Appliquée, Université V. Segalen Bordeaux 2/INRA, Faculté d’?nologie, 351 cours de la Libération, 33405 Talence Cedex – France |
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Abstract: | The phytopathogenic fungus Botrytis cinerea produces a set of polygalacturonases (PGs) which are involved in the enzymatic degradation of pectin during plant tissue infection. Two polygalacturonases secreted by B. cinerea in seven-day-old liquid culture were purified to apparent homogeneity by chromatography. PG I was an exopolygalacturonase of molecular weight 65 kDa and pI 8.0 and PG II was an endopolygalacturonase of 52 kDa and pI 7.8. Enzymatic activity of PG I and PG II was partially inhibited by 1 mM CaCl2, probably by calcium chelation of polygalacturonic acid, the substrate of the enzyme. |
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Keywords: | Botrytis cinerea polygalacturonase calcium pectin |
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