Enzyme activity of Aspergillus section Nigri strains isolated from the Korean fermentation starter, nuruk

Aspergillus section Nigri is a fungus used industrially because of its ability to produce enzymes such as cellulolytic, amylolytic and proteolytic enzymes. In this study, we obtained twenty-eight strains of Aspergillus section Nigri from the traditional Korean fermentation starter, nuruk , which is...

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Bibliographic Details
Published in:The journal of microbiology 2022, 60(10), , pp.998-1006
Main Authors: Jeong, Eunji, Seo, Jeong-Ah
Format: Article
Language:English
Subjects:
Aspergillus
Biomedical and Life Sciences
Calcium-binding protein
Calmodulin
Cell culture
Cellulase
Enzymatic activity
Enzyme activity
Enzymes
Fermentation
Fungi
Gene sequencing
Genomics and Molecular Biology
Glucosidase
Industrial applications
Life Sciences
Microbial Genetics
Microbiology
Mixed culture
Phylogenetics
Phylogeny
Protease
Proteinase
Proteolysis
Proteolytic enzymes
Tubulin
Yeasts
β-Glucosidase
생물학
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Summary:Aspergillus section Nigri is a fungus used industrially because of its ability to produce enzymes such as cellulolytic, amylolytic and proteolytic enzymes. In this study, we obtained twenty-eight strains of Aspergillus section Nigri from the traditional Korean fermentation starter, nuruk , which is known as a mixed culture of enzymatic filamentous fungi and yeasts. All strains were identified as Aspergillus section Nigri through combined phylogenetic analysis using partial β-tubulin and calmodulin gene sequences. The cellulase, amylase and protease activities of Korean strains were measured and compared with ten reference strains of Aspergillus niger . Most Korean strains showed higher cellulolytic activity than reference strains, and Aspergillus neoniger KCN5 showed the highest β-glucosidase activity. Two-thirds of the Korean strains showed similar levels of α- and glucoamylase activity as the reference strains. The protease activity of Aspergillus section Nigri strains was the highest at pH 3.0, and A. niger KSJ2 showed the highest acidic protease activity. By comparing ten reference strains and twenty-eight Korean strains, our results suggested useful Aspergillus section Nigri strains from nuruk with high enzyme activity, such as KCN5 and KSJ2, and their potential for industrial applications as enzyme producers.
ISSN:1976-3794
1225-8873
1976-3794
DOI:10.1007/s12275-022-2071-6