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• W3082942337 endingPage "109653" @default.
• W3082942337 startingPage "109653" @default.
• W3082942337 abstract "A gene conferring α-glucosidase (AG) with high transglycosylation activity from Aspergillus neoniger (a non-niger strain belonging to section Nigri) was cloned and expressed in Pichia pastoris. As the cDNA construction retained intronic portions due to alternative splicing, the exonic portions of the gene were stitched using restriction digestion and overlap extension PCR. Pre-determined open-loop exponential feeding strategies were evaluated for methanol dosage to improve the recombinant enzyme synthesis during high-cell density cultivation in 5 L bioreactor. Specific growth rate of 0.1 h−1 resulted in the highest enzyme activity of 182.3 mU/mL in the supernatant, whereas the activity of 3.8 U/g dry cell weight was obtained in the cell pellet. There was negligible enzyme activity in the cell lysate, indicating that approximately 80 % accumulation of total enzyme is in the periplasm. Later, this unreleased fraction was extracted to 90 % yield using 25 mM cysteine. The enzyme was purified and validated using western blot analysis and MS/MS profile. The SDS PAGE analysis revealed three bands corresponding to 80, 38, and 33 kDa indicating the multimeric nature of the enzyme. Thus, obtained enzyme was utilized in synthesis of a potential prebiotic molecule, isomaltooligosaccharides (IMOs), which can be used as a sweetener and bulk filler in the food industry. This is the first report to demonstrate challenges in cloning and expression of transglycosylating α-glucosidase from Aspergillus neoniger." @default.
• W3082942337 created "2020-09-08" @default.
• W3082942337 creator A5027943284 @default.
• W3082942337 creator A5072719712 @default.
• W3082942337 date "2020-11-01" @default.
• W3082942337 modified "2023-09-25" @default.
• W3082942337 title "Expression of a novel α-glucosidase from Aspergillus neoniger in Pichia pastoris and its efficient recovery for synthesis of isomaltooligosaccharides" @default.
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• W3082942337 doi "https://doi.org/10.1016/j.enzmictec.2020.109653" @default.
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