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Ponnusamy V, Sankaranarayanan M. Targeted gene manipulation of Leloir pathway genes for the constitutive expression of β-galactosidase and its transgalactosylation product galacto-oligosaccharides from Kluyveromyces lactis GG799 and knockout strains. Enzyme Microb Technol 2023; 169:110263. [PMID: 37311284 DOI: 10.1016/j.enzmictec.2023.110263] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Revised: 05/19/2023] [Accepted: 05/20/2023] [Indexed: 06/15/2023]
Abstract
Galacto-oligosaccharides (GOS) are used as prebiotic ingredients in various food and pharmaceutical industry. At present, production of GOS involves the enzymatic transformation of lactose by transgalactosylation using β-galactosidase. The yeast Kluyveromyces lactis can utilize lactose as its carbon and energy source. In this species lactose is hydrolyzed by an intracellular β-galactosidase (EC 3.2.1.23) which is induced by its substrate and related compounds like galactose. The molecular details of gene regulation in kluyveromyces lactis, we have used multiple knockout approaches to study the constitutive expression by which galactose induces β-galactosidase. The present study involved carrying out to a method of enhancing the constitutive expression of β-galactosidase through galactose induction and its trans-galactosylation reaction for the production of galacto-oligosaccharides (GOS) in Kluyveromyces lactis (K. Lactis) by applying a knockout based approach on Leloir pathway genes based on fusion-overlap extension polymerase chain reaction and transformation into its genome. The k.lactis strain subjected to Leloir pathway genes knockout, resulted in the accumulation of galactose intracellularly and this internal galactose acts as an inducer of galactose regulon for constitutive expression of β-galactosidase at early stationary phase was due to the positive regulatory function of mutant gal1p, gal7p and both. These resulted strains used for trans-galactosylation of lactose by β - galactosidase is characterized for the production of galacto-oligosaccharides. Galactose-induced constitutive expression of β-galactosidase during the early stationary phase of knockout strains was analysed qualitatively & quantitatively. The activity of β-galactosidase of wild type, gal1z, gal7k and gal1z & gal7k strains were 7, 8, 9 and 11 U/ml respectively using high cell density cultivation medium. Based on these expression differences in β-galactosidase, the trans-galactosylation reaction for GOS production and percentage yield of GOS were compared at 25% w/v of lactose. The percentage yield of GOS production of wild type, Δgal1z Lac4+, Δgal7k Lac4++ and Δgal1z Δgal7k Lac4+++mutants strains were 6.3, 13, 17 and 22 U/ml, respectively. Therefore, we propose that the availability of galactose can be used for constitutive over expression of β - galactosidase in Leloir pathway engineering applications and also for GOS production. Further, increased expression of β - galactosidases can be used in dairy industry by-products like whey to produce added value products such as galacto-oligosaccharides.
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Characterization of putative mannoprotein in Kluyveromyces lactis for lactase production. Synth Syst Biotechnol 2023; 8:168-175. [PMID: 36733311 PMCID: PMC9880975 DOI: 10.1016/j.synbio.2023.01.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2022] [Revised: 12/24/2022] [Accepted: 01/01/2023] [Indexed: 01/07/2023] Open
Abstract
Lactase is a member of the β-galactosidase family of enzymes that can hydrolyze lactose into galactose and glucose. However, extracellular lactase production was still restricted to the process of cell lysis. In this study, lactase-producing Kluyveromyces lactis JNXR-2101 was obtained using a rapid and sensitive method based on the fluorescent substrate 4-methylumbelliferyl-β-d-galactopyranoside. The purified enzyme was identified as a neutral lactase with an optimum pH of 9. To facilitate extracellular production of lactase, a putative mannoprotein KLLA0_E01057g of K. lactis was knocked out. It could effectively promote cell wall degradation and lactase production after lyticase treatment, which showed potential on other extracellular enzyme preparation. After optimizing the fermentation conditions, the lactase yield from mannoprotein-deficient K. lactis JNXR-2101ΔE01057g reached 159.62 U/mL in a 5-L fed-batch bioreactor.
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Sampaio FC, de Faria JT, da Silva MF, de Souza Oliveira RP, Converti A. Cheese whey permeate fermentation by Kluyveromyces lactis: a combined approach to wastewater treatment and bioethanol production. ENVIRONMENTAL TECHNOLOGY 2020; 41:3210-3218. [PMID: 30955482 DOI: 10.1080/09593330.2019.1604813] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2019] [Accepted: 04/02/2019] [Indexed: 06/09/2023]
Abstract
Cheese whey is a dairy industry by-product responsible for serious environmental problems. Its fermentation would allow reducing its environmental impact and producing, at the same time, high-value products, hence ensuring cleaner production. Batch fermentations of cheese whey permeate, either as such or 1.5-fold or twice-concentrated, by Kluyveromyces lactis CBS2359 were performed in flasks with or without agitation to select the best conditions to produce simultaneously ethanol and biomass with high β-galactosidase activity. In shake cultures, the highest ethanol concentration (15.0 g L-1), yield on consumed lactose (0.47 g g-1) and productivity (0.31 g L-1 h-1), were obtained on cheese whey permeate as such, corresponding to 87.4% fermentation efficiency, but β-galactosidase activity was disappointing (449.3-680.0 U g-1). In static cultures on twice-concentrated whey permeate, despite a decrease in fermentation efficiency and yield, ethanol production increased by 48% and β-galactosidase activity by no less than 209-367%. Therefore, cheese whey should be considered an alternative feedstock rather than an undesirable dairy industry by-product.
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Affiliation(s)
| | - Janaína Teles de Faria
- Agricultural Sciences Institute, Federal University of Minas Gerais, Montes Claros, Brazil
| | | | | | - Attilio Converti
- Department of Civil, Chemical and Environmental Engineering, Genoa University, Genoa, Italy
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de Andrade BC, Migliavacca VF, Okano FY, Grafulin VY, Lunardi J, Roth G, de Souza CFV, Santos DS, Chies JM, Renard G, Volpato G. Production of recombinant β-galactosidase in bioreactors by fed-batch culture using DO-stat and linear control. BIOCATAL BIOTRANSFOR 2018. [DOI: 10.1080/10242422.2018.1493105] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- Bruna Coelho de Andrade
- Instituto Federal de Educação, Porto Alegre, Brazil
- Quatro G Pesquisa & Desenvolvimento Ltda, Porto Alegre, Brazil
- Pontifícia Universidade Católica do Rio Grande do Sul, Porto Alegre, Brazil
| | - Victória Furtado Migliavacca
- Instituto Federal de Educação, Porto Alegre, Brazil
- Quatro G Pesquisa & Desenvolvimento Ltda, Porto Alegre, Brazil
- Universidade Estadual do Rio Grande do Sul, Porto Alegre, Brazil
| | - Felipe Yuji Okano
- Instituto Federal de Educação, Porto Alegre, Brazil
- Quatro G Pesquisa & Desenvolvimento Ltda, Porto Alegre, Brazil
- Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Vanessa Yuki Grafulin
- Instituto Federal de Educação, Porto Alegre, Brazil
- Quatro G Pesquisa & Desenvolvimento Ltda, Porto Alegre, Brazil
- Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Juleane Lunardi
- Quatro G Pesquisa & Desenvolvimento Ltda, Porto Alegre, Brazil
| | - Gustavo Roth
- Quatro G Pesquisa & Desenvolvimento Ltda, Porto Alegre, Brazil
- Pontifícia Universidade Católica do Rio Grande do Sul, Porto Alegre, Brazil
| | - Claucia Fernanda Volken de Souza
- Laboratório de Biotecnologia de Alimentos, Programa de Pós-Graduação em Biotecnologia, Universidade do Vale do Taquari – UNIVATES, Lajeado, Brazil
| | | | | | - Gaby Renard
- Pontifícia Universidade Católica do Rio Grande do Sul, Porto Alegre, Brazil
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You S, Chang H, Yin Q, Qi W, Wang M, Su R, He Z. Utilization of whey powder as substrate for low-cost preparation of β-galactosidase as main product, and ethanol as by-product, by a litre-scale integrated process. BIORESOURCE TECHNOLOGY 2017; 245:1271-1276. [PMID: 28893497 DOI: 10.1016/j.biortech.2017.08.092] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2017] [Revised: 08/15/2017] [Accepted: 08/16/2017] [Indexed: 06/07/2023]
Abstract
Whey powder, a by-product of dairy industry, is an attractive raw material for value-added products. In this study, utilization of whey powder as substrate for low-cost preparation of β-galactosidase as main product and ethanol as by-product were investigated by a litre-scale integrated strategy, encompassing fermentation, isolation, permeabilization and spray drying. Firstly, through development of low-cost industrial culture and fed-batch strategies by Kluyveromyces lactis, 119.30U/mL β-galactosidase activity and 16.96mg/mL by-product ethanol were achieved. Afterward, an up-dated mathematic model for the recycling permeabilization was established successfully and 30.4g cells sediment isolated from 5L fermentation broth were permeabilized completely by distilled ethanol from broth supernatant. Then β-galactosidase product with 5.15U/mg from protection of gum acacia by spray drying was obtained. Furthermore, by-product ethanol with 31.08% (v/v) was achieved after permeabilization. Therefore, the integrated strategy using whey powder as substrate is a feasible candidate for industrial-scale implementation.
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Affiliation(s)
- Shengping You
- Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PR China
| | - Hongxing Chang
- Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PR China
| | - Qingdian Yin
- Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PR China
| | - Wei Qi
- Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PR China; State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin 300072, PR China; Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, PR China; Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin University, Tianjin 300072, PR China.
| | - Mengfan Wang
- Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PR China; Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin University, Tianjin 300072, PR China
| | - Rongxin Su
- Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PR China; State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin 300072, PR China; Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, PR China; Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin University, Tianjin 300072, PR China
| | - Zhimin He
- Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PR China; State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin 300072, PR China
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