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Muhammad MA, Ahmad N, Akhter M, Rashid N. Structural and functional analyses of Pcal_0917, an α-glucosidase from hyperthermophilic archaeon Pyrobaculum calidifontis. Int J Biol Macromol 2023:125446. [PMID: 37330102 DOI: 10.1016/j.ijbiomac.2023.125446] [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: 03/21/2023] [Revised: 05/16/2023] [Accepted: 06/14/2023] [Indexed: 06/19/2023]
Abstract
Genome analysis of Pyrobaculum calidifontis revealed the presence of α-glucosidase (Pcal_0917) gene. Structural analysis affirmed the presence of signature sequences of Type II α-glucosidases in Pcal_0917. We have heterologously expressed the gene and produced recombinant Pcal_0917 in Escherichia coli. Biochemical characteristics of the recombinant enzyme resembled to that of Type I α-glucosidases, instead of Type II. Recombinant Pcal_0917 existed in a tetrameric form in solution and displayed highest activity at 95 °C and pH 6.0, independent of any metal ions. A short heat-treatment at 90 °C resulted in a 35 % increase in enzyme activity. A slight structural shift was observed by CD spectrometry at this temperature. Half-life of the enzyme was >7 h at 90 °C. Pcal_0917 exhibited apparent Vmax values of 1190 ± 5 and 3.9 ± 0.1 U/mg against p-nitrophenyl α-D-glucopyranoside and maltose, respectively. To the best of our knowledge, Pcal_0917 displayed the highest ever reported p-nitrophenyl α-D-glucopyranosidase activity among the characterized counterparts. Moreover, Pcal_0917 displayed transglycosylation activity in addition to α-glucosidase activity. Furthermore, in combination with α-amylase, Pcal_0917 was capable of producing glucose syrup from starch with >40 % glucose content. These properties make Pcal_0917 a potential candidate for starch hydrolyzing industry.
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Affiliation(s)
- Majida Atta Muhammad
- School of Biological Sciences, University of the Punjab, Quaid-e-Azam Campus, Lahore 54590, Pakistan
| | - Nasir Ahmad
- School of Biological Sciences, University of the Punjab, Quaid-e-Azam Campus, Lahore 54590, Pakistan
| | - Mohsina Akhter
- School of Biological Sciences, University of the Punjab, Quaid-e-Azam Campus, Lahore 54590, Pakistan
| | - Naeem Rashid
- School of Biological Sciences, University of the Punjab, Quaid-e-Azam Campus, Lahore 54590, Pakistan.
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Zhou B, Huang N, Zeng W, Zhang H, Chen G, Liang Z. Development of a strategy for the screening of α-glucosidase-producing microorganisms. J Microbiol 2020; 58:163-172. [PMID: 31993989 DOI: 10.1007/s12275-020-9267-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2019] [Revised: 12/12/2019] [Accepted: 12/16/2019] [Indexed: 11/28/2022]
Abstract
α-Glucosidase is a crucial enzyme for the production of isomaltooligosaccharide. In this study, a novel method comprising eosin Y (EY) and α-D-methylglucoside (AMG) in glass plates was tested for the primary screening of α-glucosidaseproducing strains. First, α-glucosidase-producing Aspergillus niger strains were selected on plates containing EY and AMG based on transparent zone formation resulting from the solubilization of EY by the hydrolyzed product. Conventional methods that use trypan blue (TB) and p-nitrophenyl-α-D-glucopyranoside (pPNP) as indicators were then compared with the new strategy. The results showed that EY-containing plates provide the advantages of low price and higher specificity for the screening of α-glucosidase-producing strains. We then evaluated the correlation between the hydrolytic activity of α-glucosidase and diffusion distance, and found that good linearity could be established within a 6-75 U/ml enzyme concentration range. Finally, the hydrolytic and transglycosylation activities of α-glucosidase obtained from the target isolates were determined by EY plate assay and 3,5-dinitrosalicylic acid-Saccharomyces cerevisiae assay, respectively. The results showed that the diameter of the transparent zone varied among isolates was positively correlated with α-glucosidase hydrolytic activity, while good linearity could also be established between α-glucosidase transglycosylation activity and non-fermentable reducing sugars content. With this strategy, 7 Aspergillus niger mutants with high yield of α-glucosidase from 200 obvious single colonies on the primary screen plate were obtained.
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Affiliation(s)
- Bo Zhou
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangxi Microorganism and Enzyme Research Center of Engineering Technology, College of Life Science and Technology, Guangxi University, 100 Daxue Road, Nanning, Guangxi, 530004, P. R. China
| | - Nan Huang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangxi Microorganism and Enzyme Research Center of Engineering Technology, College of Life Science and Technology, Guangxi University, 100 Daxue Road, Nanning, Guangxi, 530004, P. R. China
| | - Wei Zeng
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangxi Microorganism and Enzyme Research Center of Engineering Technology, College of Life Science and Technology, Guangxi University, 100 Daxue Road, Nanning, Guangxi, 530004, P. R. China
| | - Hao Zhang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangxi Microorganism and Enzyme Research Center of Engineering Technology, College of Life Science and Technology, Guangxi University, 100 Daxue Road, Nanning, Guangxi, 530004, P. R. China
| | - Guiguang Chen
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangxi Microorganism and Enzyme Research Center of Engineering Technology, College of Life Science and Technology, Guangxi University, 100 Daxue Road, Nanning, Guangxi, 530004, P. R. China
| | - Zhiqun Liang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangxi Microorganism and Enzyme Research Center of Engineering Technology, College of Life Science and Technology, Guangxi University, 100 Daxue Road, Nanning, Guangxi, 530004, P. R. China.
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Visnapuu T, Meldre A, Põšnograjeva K, Viigand K, Ernits K, Alamäe T. Characterization of a Maltase from an Early-Diverged Non-Conventional Yeast Blastobotrys adeninivorans. Int J Mol Sci 2019; 21:E297. [PMID: 31906253 PMCID: PMC6981392 DOI: 10.3390/ijms21010297] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2019] [Revised: 12/20/2019] [Accepted: 12/30/2019] [Indexed: 11/17/2022] Open
Abstract
Genome of an early-diverged yeast Blastobotrys (Arxula) adeninivorans (Ba) encodes 88 glycoside hydrolases (GHs) including two α-glucosidases of GH13 family. One of those, the rna_ARAD1D20130g-encoded protein (BaAG2; 581 aa) was overexpressed in Escherichia coli, purified and characterized. We showed that maltose, other maltose-like substrates (maltulose, turanose, maltotriose, melezitose, malto-oligosaccharides of DP 4‒7) and sucrose were hydrolyzed by BaAG2, whereas isomaltose and isomaltose-like substrates (palatinose, α-methylglucoside) were not, confirming that BaAG2 is a maltase. BaAG2 was competitively inhibited by a diabetes drug acarbose (Ki = 0.8 µM) and Tris (Ki = 70.5 µM). BaAG2 was competitively inhibited also by isomaltose-like sugars and a hydrolysis product-glucose. At high maltose concentrations, BaAG2 exhibited transglycosylating ability producing potentially prebiotic di- and trisaccharides. Atypically for yeast maltases, a low but clearly recordable exo-hydrolytic activity on amylose, amylopectin and glycogen was detected. Saccharomyces cerevisiae maltase MAL62, studied for comparison, had only minimal ability to hydrolyze these polymers, and its transglycosylating activity was about three times lower compared to BaAG2. Sequence identity of BaAG2 with other maltases was only moderate being the highest (51%) with the maltase MalT of Aspergillus oryzae.
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Affiliation(s)
| | | | | | | | | | - Tiina Alamäe
- Department of Genetics, Institute of Molecular and Cell Biology, University of Tartu, Riia 23, 51010 Tartu, Estonia; (T.V.); (A.M.); (K.P.); (K.V.); (K.E.)
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Pasin TM, dos Anjos Moreira E, de Lucas RC, Benassi VM, Ziotti LS, Cereia M, Polizeli MDLTDM. Novel amylase-producing fungus hydrolyzing wheat and brewing residues, Aspergillus carbonarius, discovered in tropical forest remnant. Folia Microbiol (Praha) 2019; 65:173-184. [DOI: 10.1007/s12223-019-00720-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2018] [Accepted: 05/26/2019] [Indexed: 10/26/2022]
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Del Moral S, Barradas-Dermitz DM, Aguilar-Uscanga MG. Production and biochemical characterization of α-glucosidase from Aspergillus niger ITV-01 isolated from sugar cane bagasse. 3 Biotech 2018; 8:7. [PMID: 29259882 DOI: 10.1007/s13205-017-1029-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2017] [Accepted: 12/04/2017] [Indexed: 12/01/2022] Open
Abstract
Aspergillus niger ITV-01 presents amylolytic activity, identified as α-glucosidase, an enzyme that only produces α-d-glucose from soluble starch and that presents transglucosylase activity on α-d-glucopyranosyl-(1-4)-α-d-glucopyranose (maltose) (200 gL-1). Biochemical characterization was performed on A. niger ITV-01 α-glucosidase; its optimum parameters were pH 4.3, temperature 80 °C but stable at 40 °C, with an energy of activation (Ea) 176.25 kJ mol-1. Using soluble starch as the substrate, Km and Vmax were 5 mg mL-1 and 1000 U mg-1, respectively. As α-glucosidase is not a metalloenzyme, calcium and EDTA did not have any effect on its activity. The molecular weight was estimated by SDS-PAGE to be about 75 kDa. It was also active in methanol and ethanol. When ammonium sulfate (AS) and yeast extract (YE) nitrogen sources and calcium effect were evaluated, the greatest activity occurred using YE and calcium, as opposed to AS media where no activity was detected. The results obtained showed that this enzyme has industrial application potential in the processes to produce either ethanol or malto-oligosaccharides from α-d-glucopyranosyl-(1-4)-α-d-glucopyranose (maltose).
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Affiliation(s)
- S Del Moral
- Instituto de Biotecnología. Universidad del Papaloapan, Circuito Central 200. Tuxtepec, 68400 Oaxaca, Mexico
- Unidad de Desarrollo en Alimentos (UNIDA), Tecnológico Nacional de México, Instituto Tecnológico de Veracruz, Av. Miguel Ángel de Quevedo, 2779, Col. Formando Hogar, 91850 H. Veracruz, Veracruz Mexico
| | - D M Barradas-Dermitz
- Área Química-Biológica, Tecnológico Nacional de México-Instituto Tecnológico de Veracruz, Miguel Ángel de Quevedo, 91850 H. Veracruz, Veracruz Mexico
| | - M G Aguilar-Uscanga
- Unidad de Desarrollo en Alimentos (UNIDA), Tecnológico Nacional de México, Instituto Tecnológico de Veracruz, Av. Miguel Ángel de Quevedo, 2779, Col. Formando Hogar, 91850 H. Veracruz, Veracruz Mexico
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Pasin TM, Benassi VM, Heinen PR, Damasio ARDL, Cereia M, Jorge JA, Polizeli MDLTDM. Purification and functional properties of a novel glucoamylase activated by manganese and lead produced by Aspergillus japonicus. Int J Biol Macromol 2017; 102:779-788. [DOI: 10.1016/j.ijbiomac.2017.04.016] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2017] [Revised: 03/31/2017] [Accepted: 04/04/2017] [Indexed: 12/20/2022]
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Purification, characterization and gene analysis of a new α-glucosidase from shiraia sp. SUPER-H168. ANN MICROBIOL 2016. [DOI: 10.1007/s13213-016-1238-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Molecular characterization and heterologous expression of a Xanthophyllomyces dendrorhous α-glucosidase with potential for prebiotics production. Appl Microbiol Biotechnol 2015; 100:3125-35. [PMID: 26615395 DOI: 10.1007/s00253-015-7171-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2015] [Revised: 11/09/2015] [Accepted: 11/11/2015] [Indexed: 10/22/2022]
Abstract
Basidiomycetous yeast Xanthophyllomyces dendrorhous expresses an α-glucosidase with strong transglycosylation activity producing prebiotic sugars such as panose and an unusual tetrasaccharides mixture including α-(1-6) bonds as major products, which makes it of biotechnological interest. Initial analysis pointed to a homodimeric protein of 60 kDa subunit as responsible for this activity. In this study, the gene Xd-AlphaGlu was characterized. The 4131-bp-long gene is interrupted by 13 short introns and encodes a protein of 990 amino acids (Xd-AlphaGlu). The N-terminal sequence of the previously detected 60 kDa protein resides in this larger protein at residues 583-602. Functionality of the gene was proved in Saccharomyces cerevisiae, which produced a protein of about 130 kDa containing Xd-AlphaGlu sequences. All properties of the heterologously expressed protein, including thermal and pH profiles, activity on different substrates, and ability to produce prebiotic sugars were similar to that of the α-glucosidase produced in X. dendrorhous. No activity was detected in S. cerevisiae containing exclusively the 1256-bp from gene Xd-AlphaGlu that would encode synthesis of the 60 kDa protein previously detected. Data were compatible with an active monomeric α-glucosidase of 990 amino acids and an inactive hydrolysis product of 60 kDa. Protein Xd-AlphaGlu contained most of the elements characteristic of α-glucosidases included in the glycoside hydrolases family GH31 and its structural model based on the homologous human maltase-glucoamylase was obtained. Remarkably, the Xd-AlphaGlu C-terminal domain presents an unusually long 115-residue insertion that could be involved in this enzyme's activity against long-size substrates such as maltoheptaose and soluble starch.
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Amado IR, Vázquez JA. Mussel processing wastewater: a low-cost substrate for the production of astaxanthin by Xanthophyllomyces dendrorhous. Microb Cell Fact 2015; 14:177. [PMID: 26553283 PMCID: PMC4640366 DOI: 10.1186/s12934-015-0375-5] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2015] [Accepted: 10/30/2015] [Indexed: 02/01/2023] Open
Abstract
Background The use of astaxanthin in different industries such as the chemical, pharmaceutical, food, animal feed and cosmetic has been receiving increasing attention in recent years. Natural supplies of the pigment include crustacean by-products, algal, and microbial cultivation, being the yeast Xanthophyllomyces dendrorhous together with the alga Haematococcus pluvialis the most promising microorganisms for this bioproduction. Different vegetable by-products of the food industry have been explored so far as low-cost substrates for the production of astaxanthin by X. dendrorhous. This study focuses for the first time on the use of a low-cost formulated medium from a marine by-product, mussel-processing wastewater, for the production of astaxanthin by the yeast X. dendrorhous. Results The yeast was able to grow in non-saccharified mussel broth, revealing the ability of the microorganism to hydrolyze glycogen. However, partial glycogen saccharification with α-amylase was needed for astaxanthin biosynthesis, obtaining maximal productions of 22.5–26.0 mg/L towards the end of the culture and coinciding with yeast highest amylolytic activity. Cultivations in totally-saccharified media revealed an increase in maximal cell concentrations and a decrease in maximal growth rates and astaxanthin production with increasing glucose initial concentration. Conclusions Astaxanthin production was higher in partially-saccharified mussel-processing waste than in synthetic medium (yeast peptone dextrose) containing glucose as carbon source (13 mg/L), suggesting this by-product is a promising nutritive medium for astaxanthin production. The use of this effluent also contributes towards the recycling and depuration of this highly pollutant effluent.
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Affiliation(s)
- Isabel Rodríguez Amado
- Grupo de Reciclado y Valorización de Residuos (REVAL), Instituto de Investigacións Mariñas (IIM-CSIC), R/Eduardo Cabello 6, 36208, Vigo, Spain. .,Departamento de Química Analítica y Alimentaria, Facultad de Ciencias de Ourense, Universidad de Vigo, Campus As Lagoas s/n, Orense, Spain.
| | - José Antonio Vázquez
- Grupo de Reciclado y Valorización de Residuos (REVAL), Instituto de Investigacións Mariñas (IIM-CSIC), R/Eduardo Cabello 6, 36208, Vigo, Spain.
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Ebrahimi MMS, Laabei M, Jenkins ATA, Schönherr H. Autonomously Sensing Hydrogels for the Rapid and Selective Detection of Pathogenic Bacteria. Macromol Rapid Commun 2015; 36:2123-8. [PMID: 26474087 DOI: 10.1002/marc.201500485] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2015] [Indexed: 11/12/2022]
Abstract
The development of a versatile approach for the rapid and sensitive detection of relevant pathogenic bacteria and autonomous signaling of the detection events in reporter hydrogel film coatings is reported. Exploiting chitosan hydrogel films equipped with chromogenic or fluorogenic reporter moieties, the presence of the Gram-negative bacterium Pseudomonas aeruginosa and the Gram-positive bacterium Staphylococcus aureus is sensed within 1 h by detecting the characteristic enzymes α-glucosidase and elastase with limits of detection (LOD) <45 × 10(-9) M and <20 × 10(-9) M, respectively, for this observation time. The values for the LOD are two to three orders of magnitude smaller than the concentrations of the enzymes detected in the corresponding bacterial supernatants. The results show that the covalently conjugated reporter moieties are exclusively and efficiently reacted by the associated enzyme, allowing in principle for discrimination among different types of bacteria. Since high enzyme concentrations are a result of proliferating bacteria, e.g., in wounds or food, and since the selectivity of the reporting function is easily adapted to bacteria of choice, these reporter hydrogels comprise an interesting platform for the rapid detection of bacteria.
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Affiliation(s)
- Mir-Morteza Sadat Ebrahimi
- Physical Chemistry I, Department of Chemistry and Biology & Research Center of Micro and Nanochemistry and Engineering (Cμ), University of Siegen, Adolf-Reichwein-Str. 2, 57076, Siegen, Germany
| | - Maisem Laabei
- Department of Biology and Biochemistry, University of Bath, Claverton Down, Bath, BA2 7AY, UK
| | - A Tobias A Jenkins
- Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, UK
| | - Holger Schönherr
- Physical Chemistry I, Department of Chemistry and Biology & Research Center of Micro and Nanochemistry and Engineering (Cμ), University of Siegen, Adolf-Reichwein-Str. 2, 57076, Siegen, Germany
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Linde D, Rodríguez-Colinas B, Estévez M, Poveda A, Plou FJ, Fernández Lobato M. Analysis of neofructooligosaccharides production mediated by the extracellular β-fructofuranosidase from Xanthophyllomyces dendrorhous. BIORESOURCE TECHNOLOGY 2012; 109:123-130. [PMID: 22297043 DOI: 10.1016/j.biortech.2012.01.023] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2011] [Revised: 12/20/2011] [Accepted: 01/07/2012] [Indexed: 05/31/2023]
Abstract
The extracellular β-fructofuranosidase Xd-INV from the yeast Xanthophyllomyces dendrorhous mainly synthesizes the neo-fructooligosaccharides (neo-FOS) neokestose and neonystose. This enzyme is a glycoprotein with a content of 59-67% N-linked carbohydrates and an estimated molecular mass of 160-200 kDa. The extent level of glycosylation affects the thermal behaviour of the enzyme but not its hydrolase and transferase activities, which are optimal at 60-70 °C. The neo-FOS yield of this enzyme was increased from 40 to 168 g/L when the sucrose concentration increased from 420 to 600 g/L and when the reaction was carried out at 60 °C. The neo-FOS levels obtained (168 g/L) in this work are the largest reported for any microbial β-fructofuranosidase.
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Affiliation(s)
- Dolores Linde
- Centro de Biología Molecular Severo Ochoa, Departamento de Biología Molecular (CSIC-UAM), Universidad Autónoma Madrid, 28049 Madrid, Spain
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A high-throughput method for screening of Aspergillus niger mutants with high transglycosylation activity by detecting non-fermentable reducing sugar. World J Microbiol Biotechnol 2010; 27:1519-23. [DOI: 10.1007/s11274-010-0595-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2010] [Accepted: 10/13/2010] [Indexed: 11/25/2022]
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da Silva TM, Michelin M, de Lima Damásio AR, Maller A, Almeida FBDR, Ruller R, Ward RJ, Rosa JC, Jorge JA, Terenzi HF, de Lourdes Teixeira de Moraes Poliz M. Purification and biochemical characterization of a novel α-glucosidase from Aspergillus niveus. Antonie van Leeuwenhoek 2009; 96:569-78. [DOI: 10.1007/s10482-009-9372-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2009] [Accepted: 08/10/2009] [Indexed: 10/20/2022]
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Molecular and biochemical characterization of a beta-fructofuranosidase from Xanthophyllomyces dendrorhous. Appl Environ Microbiol 2008; 75:1065-73. [PMID: 19088319 DOI: 10.1128/aem.02061-08] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
An extracellular beta-fructofuranosidase from the yeast Xanthophyllomyces dendrorhous was characterized biochemically, molecularly, and phylogenetically. This enzyme is a glycoprotein with an estimated molecular mass of 160 kDa, of which the N-linked carbohydrate accounts for 60% of the total mass. It displays optimum activity at pH 5.0 to 6.5, and its thermophilicity (with maximum activity at 65 to 70 degrees C) and thermostability (with a T(50) in the range 66 to 71 degrees C) is higher than that exhibited by most yeast invertases. The enzyme was able to hydrolyze fructosyl-beta-(2-->1)-linked carbohydrates such as sucrose, 1-kestose, or nystose, although its catalytic efficiency, defined by the k(cat)/K(m) ratio, indicates that it hydrolyzes sucrose approximately 4.2 times more efficiently than 1-kestose. Unlike other microbial beta-fructofuranosidases, the enzyme from X. dendrorhous produces neokestose as the main transglycosylation product, a potentially novel bifidogenic trisaccharide. Using a 41% (wt/vol) sucrose solution, the maximum fructooligosaccharide concentration reached was 65.9 g liter(-1). In addition, we isolated and sequenced the X. dendrorhous beta-fructofuranosidase gene (Xd-INV), showing that it encodes a putative mature polypeptide of 595 amino acids and that it shares significant identity with other fungal, yeast, and plant beta-fructofuranosidases, all members of family 32 of the glycosyl-hydrolases. We demonstrate that the Xd-INV could functionally complement the suc2 mutation of Saccharomyces cerevisiae and, finally, a structural model of the new enzyme based on the homologous invertase from Arabidopsis thaliana has also been obtained.
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Transformation of maltose into prebiotic isomaltooligosaccharides by a novel α-glucosidase from Xantophyllomyces dendrorhous. Process Biochem 2007. [DOI: 10.1016/j.procbio.2007.08.007] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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17
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Purification and characterization of a novel ginsenoside-hydrolyzing β-d-glucosidase from the China white jade snail (Achatina fulica). Enzyme Microb Technol 2007. [DOI: 10.1016/j.enzmictec.2006.10.011] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Current awareness on yeast. Yeast 2006. [DOI: 10.1002/yea.1317] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
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