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Jayaraman AB, Kandasamy T, Venkataraman D, S M. Rational design of Shewanella sp. l-arabinose isomerase for d-galactose isomerase activity under mesophilic conditions. Enzyme Microb Technol 2021; 147:109796. [PMID: 33992411 DOI: 10.1016/j.enzmictec.2021.109796] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Revised: 03/23/2021] [Accepted: 03/24/2021] [Indexed: 02/07/2023]
Abstract
d-Tagatose, a potential low calorific substitute for sucrose, can be produced by bioconversion of d-galactose catalysed by l-arabinose isomerase. l-Arabinose isomerase from Shewanella sp. ANA-3 is unique for its ability to catalyse bioconversion reactions under mesophilic conditions. However, d-galactose not being a natural substrate for l-arabinose isomerase is catalysed at a slower rate. We attempted to increase the biocatalytic efficiency of Shewanella sp. l-arabinose isomerase by rational design to enhance galactose isomerisation activity. In silico molecular docking, analysis has revealed that F279 is sterically hindering the binding of d-galactose at the C6 position. Substitution of bulky Phe residue with smaller hydrophilic residues such as Asn and Thr increased the galactose isomerase activity by 86 % and 12 % respectively. At mesophilic conditions, F279N mutant catalysed the bioconversion of d-galactose more efficiently than l-arabinose, indicating a shift in substrate preference.
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Affiliation(s)
- Arun Baskaran Jayaraman
- Department of Industrial Biotechnology, Government College of Technology, Coimbatore, 641013, India
| | - Thirukumaran Kandasamy
- Department of Biotechnology, Maulana Abul Kalam Azad University of Technology, West Bengal, India
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Ravikumar Y, Ponpandian LN, Zhang G, Yun J, Qi X. Harnessing -arabinose isomerase for biological production of -tagatose: Recent advances and its applications. Trends Food Sci Technol 2021. [DOI: 10.1016/j.tifs.2020.11.020] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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A Three-Step Process for the Bioconversion of Whey Permeate into a Glucose-Free D-Tagatose Syrup. Catalysts 2020. [DOI: 10.3390/catal10060647] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
We have developed a sustainable three-stage process for the revaluation of cheese whey permeate into D-tagatose, a rare sugar with functional properties used as sweetener. The experimental conditions (pH, temperature, cofactors, etc.) for each step were independently optimized. In the first step, concentrated whey containing 180–200 g/L of lactose was fully hydrolyzed by β-galactosidase from Bifidobacterium bifidum (Saphera®) in 3 h at 45 °C. Secondly, glucose was selectively removed by treatment with Pichia pastoris cells for 3 h at 30 °C. The best results were obtained with 350 mg of cells (previously grown for 16 h) per mL of solution. Finally, L-arabinose isomerase US100 from Bacillus stearothermophilus was employed to isomerize D-galactose into D-tagatose at pH 7.5 and 65 °C, in presence of 0.5 mM MnSO4. After 7 h, the concentration of D-tagatose was approximately 30 g/L (33.3% yield, referred to the initial D-galactose present in whey). The proposed integrated process takes place under mild conditions (neutral pH, moderate temperatures) in a short time (13 h), yielding a glucose-free syrup containing D-tagatose and galactose in a ratio 1:2 (w/w).
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Xu W, Zhang W, Zhang T, Jiang B, Mu W. l -arabinose isomerases: Characteristics, modification, and application. Trends Food Sci Technol 2018. [DOI: 10.1016/j.tifs.2018.05.016] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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de Sousa M, Manzo RM, García JL, Mammarella EJ, Gonçalves LRB, Pessela BC. Engineering the l-Arabinose Isomerase from Enterococcus Faecium for d-Tagatose Synthesis. Molecules 2017; 22:molecules22122164. [PMID: 29211024 PMCID: PMC6149694 DOI: 10.3390/molecules22122164] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2017] [Revised: 11/14/2017] [Accepted: 11/29/2017] [Indexed: 11/16/2022] Open
Abstract
l-Arabinose isomerase (EC 5.3.1.4) (l-AI) from Enterococcus faecium DBFIQ E36 was overproduced in Escherichia coli by designing a codon-optimized synthetic araA gene. Using this optimized gene, two N- and C-terminal His-tagged-l-AI proteins were produced. The cloning of the two chimeric genes into regulated expression vectors resulted in the production of high amounts of recombinant N-His-l-AI and C-His-l-AI in soluble and active forms. Both His-tagged enzymes were purified in a single step through metal-affinity chromatography and showed different kinetic and structural characteristics. Analytical ultracentrifugation revealed that C-His-l-AI was preferentially hexameric in solution, whereas N-His-l-AI was mainly monomeric. The specific activity of the N-His-l-AI at acidic pH was higher than that of C-His-l-AI and showed a maximum bioconversion yield of 26% at 50 °C for d-tagatose biosynthesis, with Km and Vmax parameters of 252 mM and 0.092 U mg-1, respectively. However, C-His-l-AI was more active and stable at alkaline pH than N-His-l-AI. N-His-l-AI follows a Michaelis-Menten kinetic, whereas C-His-l-AI fitted to a sigmoidal saturation curve.
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Affiliation(s)
- Marylane de Sousa
- Department of Chemical Engineering, Federal University of Ceará, Campus do Pici, BL 709, Fortaleza-CE 60455-760, Brazil.
| | - Ricardo M Manzo
- Food and Biotechnology Engineering Group, Institute of Technological Development for the Chemical Industry, National University of the Litoral (UNL), National Council of Scientific and Technical Research (CONICET), RN 168 Km 472 "Paraje El Pozo" S/N, S3000 Santa Fe, Argentina.
| | - José L García
- Center for Biological Research, CIB, Higher Council for Scientific Research, CSIC, C/Ramiro de Maeztu, 9, 28040 Madrid, Spain.
| | - Enrique J Mammarella
- Food and Biotechnology Engineering Group, Institute of Technological Development for the Chemical Industry, National University of the Litoral (UNL), National Council of Scientific and Technical Research (CONICET), RN 168 Km 472 "Paraje El Pozo" S/N, S3000 Santa Fe, Argentina.
| | - Luciana R B Gonçalves
- Department of Chemical Engineering, Federal University of Ceará, Campus do Pici, BL 709, Fortaleza-CE 60455-760, Brazil.
| | - Benevides C Pessela
- Department of Food Biotechnology and Microbiology, Institute of Research in Food Sciences, CIAL, Higher Council for Scientific Research, CSIC, C/Nicolás Cabrera 9, UAM Campus, 28049 Madrid, Spain.
- Department of Engineering and Technology, Polytechnic Institute of Sciences and Technology, Av. Luanda Sul, Rua Lateral Via S10, P.O. Box 1316, Talatona-Luanda Sul, Angola.
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Zheng Z, Mei W, Xia M, He Q, Ouyang J. Rational Design of Bacillus coagulans NL01 l-Arabinose Isomerase and Use of Its F279I Variant in d-Tagatose Production. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2017; 65:4715-4721. [PMID: 28530095 DOI: 10.1021/acs.jafc.7b01709] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
d-Tagatose is a prospective functional sweetener that can be produced by l-arabinose isomerase (AI) from d-galactose. To improve the activity of AI toward d-galactose, the AI of Bacillus coagulans was rationally designed on the basis of molecular modeling and docking. After alanine scanning and site-saturation mutagenesis, variant F279I that exhibited improved activity toward d-galactose was obtained. The optimal temperature and pH of F279I were determined to be 50 °C and 8.0, respectively. This variant possessed 1.4-fold catalytic efficiency compared with the wild-type (WT) enzyme. The recombinant Escherichia coli overexpressing F279I also showed obvious advantages over the WT in biotransformation. Under optimal conditions, 67.5 and 88.4 g L-1 d-tagatose could be produced from 150 and 250 g L-1 d-galactose, respectively, in 15 h. The biocatalyst constructed in this study presents a promising alternative for large-scale d-tagatose production.
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Affiliation(s)
- Zhaojuan Zheng
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources , Nanjing 210037, People's Republic of China
- College of Chemical Engineering, Nanjing Forestry University , Nanjing 210037, People's Republic of China
| | - Wending Mei
- College of Chemical Engineering, Nanjing Forestry University , Nanjing 210037, People's Republic of China
| | - Meijuan Xia
- College of Chemical Engineering, Nanjing Forestry University , Nanjing 210037, People's Republic of China
| | - Qin He
- College of Chemical Engineering, Nanjing Forestry University , Nanjing 210037, People's Republic of China
| | - Jia Ouyang
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources , Nanjing 210037, People's Republic of China
- College of Chemical Engineering, Nanjing Forestry University , Nanjing 210037, People's Republic of China
- Key Laboratory of Forest Genetics and Biotechnology of the Ministry of Education , Nanjing 210037, People's Republic of China
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Gómez-Govea MA, García S, Heredia N. Bacterial metabolites from intra- and inter-species influencing thermotolerance: the case of Bacillus cereus and Geobacillus stearothermophilus. Folia Microbiol (Praha) 2016; 62:183-189. [PMID: 27896600 DOI: 10.1007/s12223-016-0487-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2016] [Accepted: 11/23/2016] [Indexed: 11/29/2022]
Abstract
Bacterial metabolites with communicative functions could provide protection against stress conditions to members of the same species. Yet, information remains limited about protection provided by metabolites in Bacillus cereus and inter-species. This study investigated the effect of extracellular compounds derived from heat shocked (HS) and non-HS cultures of B. cereus and Geobacillus stearothermophilus on the thermotolerance of non-HS vegetative and sporulating B. cereus. Cultures of B. cereus and G. stearothermophilus were subjected to HS (42 or 65 °C respectively for 30 min) or non-HS treatments. Cells and supernatants were separated, mixed in a combined array, and then exposed to 50 °C for 60 min and viable cells determined. For spores, D values (85 and 95 °C) were evaluated after 120 h. In most cases, supernatants from HS B. cereus cultures added to non-HS B. cereus cells caused their thermotolerance to increase (D 50 12.2-51.9) when compared to supernatants from non-HS cultures (D 50 7.4-21.7). While the addition of supernatants from HS and non-HS G. stearothermophilus cultures caused the thermotolerance of non-HS cells from B. cereus to decrease initially (D 50 3.7-7.1), a subsequent increase was detected in most cases (D 50 18-97.7). In most cases, supernatants from sporulating G. stearothermophilus added to sporulating cells of B. cereus caused the thermotolerance of B. cereus 4810 spores to decline, whereas that of B. cereus 14579 increased. This study clearly shows that metabolites in supernatants from either the same or different species (such as G. stearothermophilus) influence the thermotolerance of B. cereus.
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Affiliation(s)
- Mayra Alejandra Gómez-Govea
- Universidad Autónoma de Nuevo León, Facultad de Ciencias Biológicas, Laboratorio de Bioquímica y Genética de Microorganismos, Ciudad Universitaria, 66455, San Nicolás de los Garza, N.L, Mexico
| | - Santos García
- Universidad Autónoma de Nuevo León, Facultad de Ciencias Biológicas, Laboratorio de Bioquímica y Genética de Microorganismos, Ciudad Universitaria, 66455, San Nicolás de los Garza, N.L, Mexico
| | - Norma Heredia
- Universidad Autónoma de Nuevo León, Facultad de Ciencias Biológicas, Laboratorio de Bioquímica y Genética de Microorganismos, Ciudad Universitaria, 66455, San Nicolás de los Garza, N.L, Mexico.
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Xu Z, Li S, Feng X, Liang J, Xu H. L-Arabinose isomerase and its use for biotechnological production of rare sugars. Appl Microbiol Biotechnol 2014; 98:8869-78. [PMID: 25280744 DOI: 10.1007/s00253-014-6073-0] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2014] [Revised: 09/02/2014] [Accepted: 09/03/2014] [Indexed: 11/26/2022]
Abstract
L-Arabinose isomerase (AI), a key enzyme in the microbial pentose phosphate pathway, has been regarded as an important biological catalyst in rare sugar production. This enzyme could isomerize L-arabinose into L-ribulose, as well as D-galactose into D-tagatose. Both the two monosaccharides show excellent commercial values in food and pharmaceutical industries. With the identification of novel AI family members, some of them have exhibited remarkable potential in industrial applications. The biological production processes for D-tagatose and L-ribose (or L-ribulose) using AI have been developed and improved in recent years. Meanwhile, protein engineering techniques involving rational design has effectively enhanced the catalytic properties of various AIs. Moreover, the crystal structure of AI has been disclosed, which sheds light on the understanding of AI structure and catalytic mechanism at molecular levels. This article reports recent developments in (i) novel AI screening, (ii) AI-mediated rare sugar production processes, (iii) molecular modification of AI, and (iv) structural biology study of AI. Based on previous reports, an analysis of the future development has also been initiated.
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Affiliation(s)
- Zheng Xu
- State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing, 210009, People's Republic of China
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Kim BJ, Hong SH, Shin KC, Jo YS, Oh DK. Characterization of a F280N variant of l-arabinose isomerase from Geobacillus thermodenitrificans identified as a d-galactose isomerase. Appl Microbiol Biotechnol 2014; 98:9271-81. [DOI: 10.1007/s00253-014-5827-z] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2014] [Revised: 05/07/2014] [Accepted: 05/13/2014] [Indexed: 10/25/2022]
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Characterization of a thermophilic l-arabinose isomerase from Thermoanaerobacterium saccharolyticum NTOU1. Biochem Eng J 2014. [DOI: 10.1016/j.bej.2013.04.026] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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LI G, XU Z, LI S, XU H. Probing the Essential Catalytic Residues and Substrate Affinity in Thermophilic L-Arabinose Isomerase by Homology Modeling and Site-Directed Mutagenesis. CHINESE JOURNAL OF CATALYSIS 2013. [DOI: 10.3724/sp.j.1088.2012.20606] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Wanarska M, Kur J. A method for the production of D-tagatose using a recombinant Pichia pastoris strain secreting β-D-galactosidase from Arthrobacter chlorophenolicus and a recombinant L-arabinose isomerase from Arthrobacter sp. 22c. Microb Cell Fact 2012; 11:113. [PMID: 22917022 PMCID: PMC3520711 DOI: 10.1186/1475-2859-11-113] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2012] [Accepted: 08/18/2012] [Indexed: 11/10/2022] Open
Abstract
Background D-Tagatose is a natural monosaccharide which can be used as a low-calorie sugar substitute in food, beverages and pharmaceutical products. It is also currently being tested as an anti-diabetic and obesity control drug. D-Tagatose is a rare sugar, but it can be manufactured by the chemical or enzymatic isomerization of D-galactose obtained by a β-D-galactosidase-catalyzed hydrolysis of milk sugar lactose and the separation of D-glucose and D-galactose. L-Arabinose isomerases catalyze in vitro the conversion of D-galactose to D-tagatose and are the most promising enzymes for the large-scale production of D-tagatose. Results In this study, the araA gene from psychrotolerant Antarctic bacterium Arthrobacter sp. 22c was isolated, cloned and expressed in Escherichia coli. The active form of recombinant Arthrobacter sp. 22c L-arabinose isomerase consists of six subunits with a combined molecular weight of approximately 335 kDa. The maximum activity of this enzyme towards D-galactose was determined as occurring at 52°C; however, it exhibited over 60% of maximum activity at 30°C. The recombinant Arthrobacter sp. 22c L-arabinose isomerase was optimally active at a broad pH range of 5 to 9. This enzyme is not dependent on divalent metal ions, since it was only marginally activated by Mg2+, Mn2+ or Ca2+ and slightly inhibited by Co2+ or Ni2+. The bioconversion yield of D-galactose to D-tagatose by the purified L-arabinose isomerase reached 30% after 36 h at 50°C. In this study, a recombinant Pichia pastoris yeast strain secreting β-D-galactosidase Arthrobacter chlorophenolicus was also constructed. During cultivation of this strain in a whey permeate, lactose was hydrolyzed and D-glucose was metabolized, whereas D-galactose was accumulated in the medium. Moreover, cultivation of the P. pastoris strain secreting β-D-galactosidase in a whey permeate supplemented with Arthrobacter sp. 22c L-arabinose isomerase resulted in a 90% yield of lactose hydrolysis, the complete utilization of D-glucose and a 30% conversion of D-galactose to D-tagatose. Conclusions The method developed for the simultaneous hydrolysis of lactose, utilization of D-glucose and isomerization of D-galactose using a P. pastoris strain secreting β-D-galactosidase and recombinant L-arabinose isomerase seems to offer an interesting alternative for the production of D-tagatose from lactose-containing feedstock.
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Affiliation(s)
- Marta Wanarska
- Department of Microbiology, Gdańsk University of Technology, Poland.
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Salonen N, Nyyssölä A, Salonen K, Turunen O. Bifidobacterium longum l-Arabinose Isomerase—Overexpression in Lactococcus lactis, Purification, and Characterization. Appl Biochem Biotechnol 2012; 168:392-405. [DOI: 10.1007/s12010-012-9783-8] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2012] [Accepted: 06/21/2012] [Indexed: 10/28/2022]
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Zhou X, Wu JC. Heterologous expression and characterization of Bacillus coagulans L-arabinose isomerase. World J Microbiol Biotechnol 2012; 28:2205-12. [PMID: 22806043 DOI: 10.1007/s11274-012-1026-1] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2011] [Accepted: 02/11/2012] [Indexed: 11/28/2022]
Abstract
Bacillus coagulans has been of great commercial interest over the past decade owing to its strong ability of producing optical pure L: -lactic acid from both hexose and pentose sugars including L: -arabinose with high yield, titer and productivity under thermophilic conditions. The L: -arabinose isomerase (L-AI) from Bacillus coagulans was heterologously over-expressed in Escherichia coli. The open reading frame of the L-AI has 1,422 nucleotides encoding a protein with 474 amino acid residues. The recombinant L-AI was purified to homogeneity by one-step His-tag affinity chromatography. The molecular mass of the enzyme was estimated to be 56 kDa by SDS-PAGE. The enzyme was most active at 70°C and pH 7.0. The metal ion Mn(2+) was shown to be the best activator for enzymatic activity and thermostability. The enzyme showed higher activity at acidic pH than at alkaline pH. The kinetic studies showed that the K (m), V (max) and k (cat)/K (m) for the conversion of L: -arabinose were 106 mM, 84 U/mg and 34.5 mM(-1)min(-1), respectively. The equilibrium ratio of L: -arabinose to L: -ribulose was 78:22 under optimal conditions. L: -ribulose (97 g/L) was obtained from 500 g/l of L: -arabinose catalyzed by the enzyme (8.3 U/mL) under the optimal conditions within 1.5 h, giving at a substrate conversion of 19.4% and a production rate of 65 g L(-1) h(-1).
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Affiliation(s)
- Xingding Zhou
- Institute of Chemical and Engineering Sciences, Agency for Science, Technology and Research (A STAR), 1 Pesek Road, Jurong Island 627833, Singapore
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Rhimi M, Bajic G, Ilhammami R, Boudebbouze S, Maguin E, Haser R, Aghajari N. The acid-tolerant L-arabinose isomerase from the mesophilic Shewanella sp. ANA-3 is highly active at low temperatures. Microb Cell Fact 2011; 10:96. [PMID: 22074172 PMCID: PMC3248863 DOI: 10.1186/1475-2859-10-96] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2011] [Accepted: 11/10/2011] [Indexed: 11/26/2022] Open
Abstract
Background L-arabinose isomerases catalyse the isomerization of L-arabinose into L-ribulose at insight biological systems. At industrial scale of this enzyme is used for the bioconversion of D-galactose into D-tagatose which has many applications in pharmaceutical and agro-food industries. The isomerization reaction is thermodynamically equilibrated, and therefore the bioconversion rates is shifted towards tagatose when the temperature is increased. Moreover, to prevent secondary reactions it will be of interest to operate at low pH. The profitability of this D-tagatose production process is mainly related to the use of lactose as cheaper raw material. In many dairy products it will be interesting to produce D-tagatose during storage. This requires an efficient L-arabinose isomerase acting at low temperature and pH values. Results The gene encoding the L-arabinose isomerase from Shewanella sp. ANA-3 was cloned and overexpressed in Escherichia coli. The purified protein has a tetrameric arrangement composed by four identical 55 kDa subunits. The biochemical characterization of this enzyme showed that it was distinguishable by its maximal activity at low temperatures comprised between 15-35°C. Interestingly, this biocatalyst preserves more than 85% of its activity in a broad range of temperatures from 4.0 to 45°C. Shewanella sp. ANA-3 L-arabinose isomerase was also optimally active at pH 5.5-6.5 and maintained over 80% of its activity at large pH values from 4.0 to 8.5. Furthermore, this enzyme exhibited a weak requirement for metallic ions for its activity evaluated at 0.6 mM Mn2+. Stability studies showed that this protein is highly stable mainly at low temperature and pH values. Remarkably, T268K mutation clearly enhances the enzyme stability at low pH values. Use of this L-arabinose isomerase for D-tagatose production allows the achievement of attractive bioconversion rates of 16% at 4°C and 34% at 35°C. Conclusions Here we reported the purification and the biochemical characterization of the novel Shewanella sp. ANA-3 L-arabinose isomerase. Determination of the biochemical properties demonstrated that this enzyme was highly active at low temperatures. The generated T268K mutant displays an increase of the enzyme stability essentially at low pH. These features seem to be very attractive for the bioconversion of D-galactose into D-tagatose at low temperature which is very interesting from industrial point of view.
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Affiliation(s)
- Moez Rhimi
- Laboratory for BioCrystallography and Structural Biology of Therapeutic Targets, Bases Moléculaires et Structurales des Systèmes Infectieux, UMR5086 CNRS/Université de Lyon1, 7 Passage du Vercors, Lyon cedex 07, France.
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Purification and biochemical characterization of an atypical β-glucosidase from Stachybotrys microspora. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/j.molcatb.2011.05.007] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Rhimi M, Ilhammami R, Bajic G, Boudebbouze S, Maguin E, Haser R, Aghajari N. The acid tolerant L-arabinose isomerase from the food grade Lactobacillus sakei 23K is an attractive D-tagatose producer. BIORESOURCE TECHNOLOGY 2010; 101:9171-9177. [PMID: 20688514 DOI: 10.1016/j.biortech.2010.07.036] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2010] [Revised: 06/10/2010] [Accepted: 07/09/2010] [Indexed: 05/29/2023]
Abstract
The araA gene encoding an L-arabinose isomerase (L-AI) from the psychrotrophic and food grade Lactobacillus sakei 23K was cloned, sequenced and over-expressed in Escherichia coli. The recombinant enzyme has an apparent molecular weight of nearly 220 kDa, suggesting it is a tetramer of four 54 kDa monomers. The enzyme is distinguishable from previously reported L-AIs by its high activity and stability at temperatures from 4 to 40 degrees C, and pH from 3 to 8, and by its low metal requirement of only 0.8 mM Mn(2+) and 0.8 mM Mg(2+) for its maximal activity and thermostability. Enzyme kinetic studies showed that this enzyme displays a high catalytic efficiency allowing D-galactose bioconversion rates of 20% and 36% at 10 and 45 degrees C, respectively, which are useful for commercial production of D-tagatose.
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Affiliation(s)
- Moez Rhimi
- Laboratoire de BioCristallographie, Institut de Biologie et Chimie des Protéines, UMR 5086-CNRS/Université de Lyon, IFR128 BioSciences Gerland-Lyon Sud, 7 Passage du Vercors, F-69367 Lyon cedex 07, France
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FITRIANI DEWI, SAKSONO BUDI. Cloning of araA Gene Encoding L-Arabinose Isomerase from Marine Geobacillus stearothermophilus Isolated from Tanjung Api, Poso, Indonesia. HAYATI JOURNAL OF BIOSCIENCES 2010. [DOI: 10.4308/hjb.17.2.58] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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Cheng L, Mu W, Jiang B. Thermostable L-arabinose isomerase from Bacillus stearothermophilus IAM 11001 for D-tagatose production: gene cloning, purification and characterisation. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2010; 90:1327-1333. [PMID: 20474051 DOI: 10.1002/jsfa.3938] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
BACKGROUND D-Tagatose, as one of the rare sugars, has been found to be a natural and safe low-calorie sweetener in food products and is classified as a GRAS substance. L-Arabinose isomerase (L-AI, EC 5.3.1.4), catalysing the isomerisations of L-arabinose and D-galactose to L-ribulose and D-tagatose respectively, is considered to be the most promising enzyme for the production of D-tagatose. RESULTS The araA gene encoding an L-AI from Bacillus stearothermophilus IAM 11001 was cloned, sequenced and overexpressed in Escherichia coli. The gene is composed of 1491 bp nucleotides and codes for a protein of 496 amino acid residues. The recombinant L-AI was purified to electrophoretical homogeneity by affinity chromatography. The purified enzyme was optimally active at 65 degrees C and pH 7.5 and had an absolute requirement for the divalent metal ion Mn(2+) for both catalytic activity and thermostability. The enzyme was relatively active and stable at acidic pH of 6. The bioconversion yield of D-galactose to D-tagatose by the purified L-AI after 12 h at 65 degrees C reached 36%. CONCLUSION The purified L-AI from B. stearothermophilus IAM 11001 was characterised and shown to be a good candidate for potential application in D-tagatose production.
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Affiliation(s)
- Lifang Cheng
- State Key Laboratory of Food Science and Technology, Jiangnan University, 1800 Lihu Avenue, Wuxi, Jiangsu, China
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Probing the molecular determinant for the catalytic efficiency of L-arabinose isomerase from Bacillus licheniformis. Appl Environ Microbiol 2010; 76:1653-60. [PMID: 20048061 DOI: 10.1128/aem.02254-09] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Bacillus licheniformis l-arabinose isomerase (l-AI) is distinguished from other l-AIs by its high degree of substrate specificity for l-arabinose and its high turnover rate. A systematic strategy that included a sequence alignment-based first screening of residues and a homology model-based second screening, followed by site-directed mutagenesis to alter individual screened residues, was used to study the molecular determinants for the catalytic efficiency of B. licheniformis l-AI. One conserved amino acid, Y333, in the substrate binding pocket of the wild-type B. licheniformis l-AI was identified as an important residue affecting the catalytic efficiency of B. licheniformis l-AI. Further insights into the function of residue Y333 were obtained by replacing it with other aromatic, nonpolar hydrophobic amino acids or polar amino acids. Replacing Y333 with the aromatic amino acid Phe did not alter catalytic efficiency toward l-arabinose. In contrast, the activities of mutants containing a hydrophobic amino acid (Ala, Val, or Leu) at position 333 decreased as the size of the hydrophobic side chain of the amino acid decreased. However, mutants containing hydrophilic and charged amino acids, such as Asp, Glu, and Lys, showed almost no activity with l-arabinose. These data and a molecular dynamics simulation suggest that Y333 is involved in the catalytic efficiency of B. licheniformis l-AI.
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Rhimi M, Aghajari N, Juy M, Chouayekh H, Maguin E, Haser R, Bejar S. Rational design of Bacillus stearothermophilus US100 l-arabinose isomerase: Potential applications for d-tagatose production. Biochimie 2009; 91:650-3. [DOI: 10.1016/j.biochi.2009.01.014] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2008] [Accepted: 01/28/2009] [Indexed: 11/28/2022]
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Chouayekh H, Bejar W, Rhimi M, Jelleli K, Mseddi M, Bejar S. Characterization of an l-arabinose isomerase from the Lactobacillus plantarum NC8 strain showing pronounced stability at acidic pH. FEMS Microbiol Lett 2008; 277:260-7. [PMID: 18031349 DOI: 10.1111/j.1574-6968.2007.00961.x] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
Gene araA encoding the l-arabinose isomerase (l-AI) from Lactobacillus plantarum NC8 was cloned and expressed in Escherichia coli. It encodes a polypeptide of 474 residues having 55% identities with l-AIs from Bacillus stearothermophilus US100 and Thermus sp. IM6501. The active form of the purified recombinant l-AI NC8 enzyme is a hexamer composed of six identical 55-kDa subunits. The purified enzyme was optimally active at 60 degrees C and pH 7.5. It required divalent cations such as Co(2+) and Mn(2+) for maximal activity and thermostability. The l-AI NC8 was exceptionally active and stable at acidic pH. Indeed, it exhibited 68% of its maximal activity at pH 5.5 and retained 89% of activity after a 24-h incubation at pH 5. The apparent K(m) values of the enzyme for l-arabinose and d-galactose were 43.4 and 69.7 mM, respectively, and its catalytic efficiency was c. 10-fold higher for the physiological substrate l-arabinose (15.5 mM(-1) min(-1)) than d-galactose (1.6 mM(-1) min(-1)). The bioconversion yield of d-galactose to d-tagatose by the purified l-AI NC8 after 6 h at 60 degrees C was 30%.
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Kuisiene N, Raugalas J, Stuknyte M, Chitavichius D. Identification of the genus Geobacillus using genus-specific primers, based on the 16S-23S rRNA gene internal transcribed spacer. FEMS Microbiol Lett 2008; 277:165-72. [PMID: 18031336 DOI: 10.1111/j.1574-6968.2007.00954.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
The aim of this study was to develop an easy and accurate technique for the identification of the genus Geobacillus. For this purpose, Geobacillus genus-specific primers GEOBAC (GEOBAC-F and GEOBAC-R) based on the 16S-23S rRNA gene internal transcribed spacer (ITS) region sequences have been designed. In total, 52 sequences from three species of the genus Geobacillus (Geobacillus stearothermophilus, Geobacillus kaustophilus and Geobacillus lituanicus) were examined for the design of these primers. Analysis of the sequences revealed three highly conservative regions common to these species: 5' and 3' end regions of 16S-23S rRNA gene ITSs and box A. Some sequences possessed two additional conservative regions - genes of tRNA(Ile) and tRNA(Ala). These particular sequences were chosen for the construction of the primers. The designed primers targeted the gene of tRNA(Ile) and the 3' end region of ITSs. This technique was validated with both the reference strains of the genus Geobacillus and the thermophilic aerobic endospore-forming environmental isolates. Different Geobacillus species could be grouped according to the number and size of GEOBAC-PCR products and identified on the basis of the AluI and TaqI restriction analysis of these products.
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MESH Headings
- Amplified Fragment Length Polymorphism Analysis/methods
- Bacillaceae/classification
- Bacillaceae/genetics
- Bacillaceae/isolation & purification
- Bacteriological Techniques/methods
- Conserved Sequence
- DNA Primers/genetics
- DNA, Bacterial/chemistry
- DNA, Bacterial/genetics
- DNA, Ribosomal Spacer/chemistry
- DNA, Ribosomal Spacer/genetics
- Molecular Sequence Data
- Polymerase Chain Reaction/methods
- Polymorphism, Restriction Fragment Length
- RNA, Transfer, Ala/genetics
- RNA, Transfer, Ile/genetics
- Sequence Analysis, DNA
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Oh DK. Tagatose: properties, applications, and biotechnological processes. Appl Microbiol Biotechnol 2007; 76:1-8. [PMID: 17492284 DOI: 10.1007/s00253-007-0981-1] [Citation(s) in RCA: 152] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2007] [Revised: 03/30/2007] [Accepted: 04/01/2007] [Indexed: 10/23/2022]
Abstract
D-Tagatose has attracted a great deal of attention in recent years due to its health benefits and similar properties to sucrose. D-Tagatose can be used as a low-calorie sweetener, as an intermediate for synthesis of other optically active compounds, and as an additive in detergent, cosmetic, and pharmaceutical formulation. Biotransformation of D-tagatose has been produced using several biocatalyst sources. Among the biocatalysts, L-arabinose isomerase has been mostly applied for D-tagatose production because of the industrial feasibility for the use of D-galactose as a substrate. In this article, the characterization of many L-arabinose isomerases and their D-tagatose production is compared. Protein engineering and immobilization of the enzyme for increasing the conversion rate of D-galactose to D-tagatose are also reviewed.
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Affiliation(s)
- Deok-Kun Oh
- Department of Bioscience and Biotechnology, Konkuk University, 1 Hwayang-Dong Gwangjin-Gu, Seoul, 143-701, South Korea.
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