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Purification and biochemical characterization of an extracellular ?-d-fructofuranosidase from Aspergillus sp.

ABSTRACT: This study focused on the purification and characterization of an extracellular ?-d-fructofuranosidase or invertase from Aspergillus sojae JU12. The protein was purified by size exclusion chromatography with 5.41 fold and 10.87% recovery. The apparent molecular mass of the enzyme was estimated to be ~ 35 kDa using SDS-PAGE and confirmed by deconvoluted mass spectrometry. The fungal ?-d-fructofuranosidase was suggested to be a monomer by native PAGE and zymography, and was found to be a glycoprotein possessing 68.92% carbohydrate content. The products of enzyme hydrolysis were detected by thin layer chromatography and revealed the monosaccharide units, d-glucose and d-fructose. ?-d-fructofuranosidase showed enhanced activity at broad pH 4.0-9.0 and activity at a temperature range from 30 to 70 °C, while the enzyme was stable at pH 8.0 and 40 °C, respectively. The ?-d-fructofuranosidase activity was lowered by metal ion inhibitors Ag2+ and Hg2+ whereas elevated by SDS and ?-ME. The fungal ?-d-fructofuranosidase was capable of hydrolyzing d-sucrose and the kinetics were determined by Lineweaver-Burk plot with Km of 10.17 mM and Vmax of 0.7801 µmol min-1. Additionally, the extracellular ?-d-fructofuranosidase demonstrated tolerance to high ethanol concentrations indicating its applicability in the production of alcoholic fermentation processes.

SUBMITTER: Lincoln L

PROVIDER: S-EPMC5794676 | biostudies-literature | 2018 Feb

REPOSITORIES: biostudies-literature

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Purification and biochemical characterization of an extracellular β-d-fructofuranosidase from <i>Aspergillus</i> sp.

Lincoln Lynette L More Sunil S SS

3 Biotech 20180120 2

This study focused on the purification and characterization of an extracellular β-d-fructofuranosidase or invertase from <i>Aspergillus sojae</i> JU12. The protein was purified by size exclusion chromatography with 5.41 fold and 10.87% recovery. The apparent molecular mass of the enzyme was estimated to be ~ 35 kDa using SDS-PAGE and confirmed by deconvoluted mass spectrometry. The fungal β-d-fructofuranosidase was suggested to be a monomer by native PAGE and zymography, and was found to be a gl ...[more]

PMID: 29430348

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Project description:BackgroundThe increasing demand and the continuous depletion in fossil fuels have persuaded researchers to investigate new sources of renewable energy. Bioethanol produced from cellulose could be a cost-effective and a viable alternative to petroleum. It is worth note that β-glucosidase plays a key role in the hydrolysis of cellulose and therefore in the production of bioethanol. This study aims to investigate a simple and standardized method for maximization of extracellular β-glucosidase production from a novel fungal isolate under solid-state fermentation using agro-industrial residues as the sole source of carbon and nitrogen. Furthermore, purification and characterization of β-glucosidase were performed to determine the conditions under which the enzyme displayed the highest performance.ResultsA fungus identified genetically as a new Aspergillus sp. DHE7 was found to exhibit the highest extracellular β-glucosidase production among the sixty fungal isolates tested. Optimization of culture conditions improved the enzyme biosynthesis by 2.1-fold (174.6 ± 5.8 U/g of dry substrate) when the fungus grown for 72 h at 35 °C on jojoba meal with 60% of initial substrate moisture, pH 6.0, and an inoculum size of 2.54 × 107 spores/mL. The enzyme was purified to homogeneity through a multi-step purification process. The purified β-glucosidase is monomeric with a molecular mass of 135 kDa as revealed by the SDS-PAGE analysis. Optimum activity was observed at 60 °C and pH of 6.0, with a remarkable pH and thermal stability. The enzyme retained about 79% and 53% of its activity, after 1 h at 70 °C and 80 °C, respectively. The purified β-glucosidase hydrolysed a wide range of substrates but displaying its greater activity on p-nitrophenyl-β-D-glucopyranoside and cellobiose. The values of Km and Vmax on p-nitrophenyl β-D-glucopyranoside were 0.4 mM and 232.6 U/mL, respectively. Purified β-glucosidase displayed high catalytic activity (improved by 25%) in solutions contained ethanol up to 15%.Conclusionβ-glucosidase characteristics associated with its ability to hydrolyse cellobiose, underscore its utilization in improving the quality of food and beverages. In addition, taking into consideration that the final concentration of ethanol produced by the conventional methods is about 10%, suggests its use in ethanol-containing industrial processes and in the saccharification processes for bioethanol production.

Project description:Background:Extracellular production of fungal lipases especially the lipases obtained from the Aspergilli has gained immense interest in recent years due to its diverse biotechnological applications. In this study, we focused on determining the fermentation parameters required for the optimal lipase production. Methods:A total of 256 fungal isolates were obtained from oil seeds. From each genus, one isolate was selected to evaluate lipase production using phenol red and tributyrin plate assays. Lipase activity was estimated using the spectrophotometric pNPP hydrolysis assay. The highest lipase producer isolates were identified using 18S ribosomal RNA gene sequencing. The genetic variability was determined by random amplified polymorphic DNA (RAPD) analysis and the dendrogram was constructed using the unweighted pair group method with arithmetic averages method. The isolates were examined in a submerged fermentation culture (Smf) to measure the effect of temperature, pH, incubation time, carbon source, nitrogen source, inoculum volume, and lipid source on lipase production. Results:Eleven isolates belonging to the genus Aspergillus were analyzed for lipase production where they were found to be the highest lipase producers among various fungal genera. All the tested isolates were identified as A. niger using 18s rRNA sequencing. Genetic diversity was evaluated among all of the studied A. niger isolates using RAPD primers. The RAPD primers were used to amplify 285 loci, of which five were polymorphic (1.75%) and seven were monomorphic (2.45%). Thus, a high level of genetic diversity was observed among all isolates. The tributyrin test and the lipase activity assay identified five strains of A. niger as high lipase producers, and their optimal enzyme activities were 709.74, 532.54, 735.64, 794.62, and 787.69 U/ml. The optimal conditions for lipase production were as follows: 40 °C, pH 7.5, 1% fructose as the carbon source, 1% yeast extract as the nitrogen source, 2% palm oil, 2.5 × 107 spores/ml suspension, and 3 days of incubation. Conclusions:The current study provides a comprehensive characterization of the optimal conditions, which are essential to enhance lipase production in five A. niger isolates.

Dataset Information

Purification and biochemical characterization of an extracellular ?-d-fructofuranosidase from Aspergillus sp.

Publications

Purification and biochemical characterization of an extracellular β-d-fructofuranosidase from <i>Aspergillus</i> sp.

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