1. Lentinan degradation in the Lentinula edodes fruiting body during postharvest preservation is reduced by downregulation of the exo-β-1,3-glucanase EXG2.
- Author
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Konno N, Nakade K, Nishitani Y, Mizuno M, and Sakamoto Y
- Subjects
- Antineoplastic Agents isolation & purification, Antineoplastic Agents metabolism, Antineoplastic Agents supply & distribution, Crops, Agricultural enzymology, Crops, Agricultural growth & development, Crops, Agricultural metabolism, Food Preservation, Food, Genetically Modified, Fruiting Bodies, Fungal enzymology, Fruiting Bodies, Fungal growth & development, Fungal Proteins genetics, Fungal Proteins metabolism, Gene Expression Regulation, Fungal, Glucan 1,3-beta-Glucosidase genetics, Glucan 1,3-beta-Glucosidase metabolism, Hydrolysis, Immunologic Factors isolation & purification, Immunologic Factors metabolism, Immunologic Factors supply & distribution, Japan, Lentinan isolation & purification, Lentinan supply & distribution, Organisms, Genetically Modified growth & development, RNA Interference, Recombinant Proteins metabolism, Shiitake Mushrooms enzymology, Shiitake Mushrooms growth & development, Time Factors, Transformation, Genetic, Up-Regulation, Down-Regulation, Fruiting Bodies, Fungal metabolism, Fungal Proteins antagonists & inhibitors, Glucan 1,3-beta-Glucosidase antagonists & inhibitors, Lentinan metabolism, Organisms, Genetically Modified metabolism, Shiitake Mushrooms metabolism
- Abstract
Lentinan from Lentinula edodes fruiting bodies (shiitake mushrooms) is a valuable β-glucan for medical purposes based on its anticancer activity and immunomodulating activity. However, lentinan content in fruiting bodies decreases after harvesting and storage due to an increase in glucanase activity. In this study, we downregulated the expression of an exo-β-1,3-glucanase, exg2, in L. edodes using RNA interference. In the wild-type strain, β-1,3-glucanase activity in fruiting bodies remarkably increased after harvesting, and 41.7% of the lentinan content was lost after 4 days of preservation. The EXG2 downregulated strain showed significantly lower lentinan degrading activity (60-70% of the wild-type strain) in the fruiting bodies 2-4 days after harvesting. The lentinan content of fresh fruiting bodies was similar in the wild-type and EXG2 downregulated strains, but in the downregulated strain, only 25.4% of the lentinan was lost after 4 days, indicating that downregulation of EXG2 enables keeping the lentinan content high longer.
- Published
- 2014
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