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Sürmeli Y, Tekedar HC, Şanlı-Mohamed G. Sequence identification and in silico characterization of novel thermophilic lipases from Geobacillus species. Biotechnol Appl Biochem 2024; 71:162-175. [PMID: 37908087 DOI: 10.1002/bab.2529] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2023] [Accepted: 10/07/2023] [Indexed: 11/02/2023]
Abstract
Microbial lipases are utilized in various biotechnological areas, including pharmaceuticals, food, biodiesel, and detergents. In this study, we cloned and sequenced Lip21 and Lip33 genes from Geobacillus sp. GS21 and Geobacillus sp. GS33, then we in silico and experimentally analyzed the encoded lipases. For this purpose, Lip21 and Lip33 were cloned, sequenced, and their amino acid sequences were investigated for determination of biophysicochemical characteristics, evolutionary relationships, and sequence similarities. 3D models were built and computationally affirmed by various bioinformatics tools, and enzyme-ligand interactions were investigated by docking analysis using six ligands. Biophysicochemical property of Lip21 and Lip33 was also determined experimentally and the results demonstrated that they had similar isoelectric point (pI) (6.21) and Tm (75.5°C) values as Tm was revealed by denatured protein analysis of the circular dichroism spectrum and pI was obtained by isoelectric focusing. Phylogeny analysis indicated that Lip21 and Lip33 were the closest to lipases from Geobacillus sp. SBS-4S and Geobacillus thermoleovorans, respectively. Alignment analysis demonstrated that S144-D348-H389 was catalytic triad residues in Lip21 and Lip33, and enzymes possessed a conserved Gly-X-Ser-X-Gly motif containing catalytic serine. 3D structure analysis indicated that Lip21 and Lip33 highly resembled each other and they were α/β hydrolase-fold enzymes with large lid domains. BANΔIT analysis results showed that Lip21 and Lip33 had higher thermal stability, compared to other thermostable Geobacillus lipases. Docking results revealed that Lip21- and Lip33-docked complexes possessed common residues (H112, K115, Q162, E163, and S141) that interacted with the substrates, except paranitrophenyl (pNP)-C10 and pNP-C12, indicating that these residues might have a significant action on medium and short-chain fatty acid esters. Thus, Lip21 and Lip33 can be potential candidates for different industrial applications.
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Affiliation(s)
- Yusuf Sürmeli
- Department of Agricultural Biotechnology, Tekirdağ Namık Kemal University, Tekirdağ, Turkey
- Department of Biotechnology and Bioengineering, İzmir Institute of Technology, İzmir, Turkey
| | - Hasan Cihad Tekedar
- Department of Biotechnology and Bioengineering, İzmir Institute of Technology, İzmir, Turkey
- College of Veterinary Medicine, Mississippi State University, Mississippi State, Mississippi, USA
| | - Gülşah Şanlı-Mohamed
- Department of Biotechnology and Bioengineering, İzmir Institute of Technology, İzmir, Turkey
- Department of Chemistry, İzmir Institute of Technology, İzmir, Turkey
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Masi C, Tebiso A, Selva Kumar K. Isolation and characterization of potential multiple extracellular enzyme-producing bacteria from waste dumping area in Addis Ababa. Heliyon 2023; 9:e12645. [PMID: 36793964 PMCID: PMC9922826 DOI: 10.1016/j.heliyon.2022.e12645] [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: 06/13/2022] [Revised: 11/01/2022] [Accepted: 12/20/2022] [Indexed: 01/06/2023] Open
Abstract
Extremozymes are innovative and robust biocatalysts produced by various microorganisms from harsh environments. As thermophilic organisms can only develop in a few places, studying them in geothermal environments has provided new insights into the origins and evolution of early life and access to significant bio-resources with potential biotechnology applications. The work aimed to isolate and identify likely multiple extracellular enzyme-producing thermophilic bacteria from an Addis Ababa landfill (Qoshe). The streaking approach was used to purify 102 isolates acquired by serial dilution and spread plate method. The isolates were morphologically and biochemically characterized. Thirty-five cellulases, 22 amylase, 17 protease, and nine lipase-producing bacteria were identified using primary screening methods. Further secondary screening using Strain safety evaluation; two bacterial strains (TQ11 and TQ46) were identified. Based on morphological and biochemical tests, they were found to be gram-positive and rod-shaped. Furthermore, molecular identification and phylogenic analysis of selected promising isolates confirmed the identity of the isolates, Paenibacillus dendritiformis (TQ11) and Anoxybacillus flavithermus (TQ46). The results indicated that, multiple extracellular enzyme-producing thermophilic bacteria isolated from a waste dumping area in Addis Ababa offer useful features for environmental sustainability in a wide range of industrial applications due to their biodegradability and specialized stability under extreme conditions, increased raw material utilization, and decreased waste.
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Affiliation(s)
- Chandran Masi
- Department of Biotechnology, College of Biological and Chemical Engineering, Addis Ababa Science and Technology University, P.O. Box 16417, Addis Ababa, Ethiopia,Bioprocess and Biotechnology Center of Excellence, Addis Ababa Science and Technology University, P.O. Box 16417, Addis Ababa, Ethiopia,Corresponding author. Department of Biotechnology, College of Biological and Chemical Engineering, Addis Ababa Science and Technology University, P.O. Box 16417, Addis Ababa, Ethiopia.
| | - Abel Tebiso
- Department of Biotechnology, College of Biological and Chemical Engineering, Addis Ababa Science and Technology University, P.O. Box 16417, Addis Ababa, Ethiopia
| | - K.V. Selva Kumar
- School of Chemical and Bioengineering, Dire Dawa University Institute of Technology, Dire Dawa, Ethiopia
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Kadriye İnan Bektas. Isolation and Molecular Identification of Xylanase and Glucose-Isomerase Producer Geobacillus and Brevibacillus Strains from Hot Springs in Turkey. BIOL BULL+ 2022. [DOI: 10.1134/s1062359021150085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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4
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Ecological and Biotechnological Relevance of Mediterranean Hydrothermal Vent Systems. MINERALS 2022. [DOI: 10.3390/min12020251] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/04/2022]
Abstract
Marine hydrothermal systems are a special kind of extreme environments associated with submarine volcanic activity and characterized by harsh chemo-physical conditions, in terms of hot temperature, high concentrations of CO2 and H2S, and low pH. Such conditions strongly impact the living organisms, which have to develop adaptation strategies to survive. Hydrothermal systems have attracted the interest of researchers due to their enormous ecological and biotechnological relevance. From ecological perspective, these acidified habitats are useful natural laboratories to predict the effects of global environmental changes, such as ocean acidification at ecosystem level, through the observation of the marine organism responses to environmental extremes. In addition, hydrothermal vents are known as optimal sources for isolation of thermophilic and hyperthermophilic microbes, with biotechnological potential. This double aspect is the focus of this review, which aims at providing a picture of the ecological features of the main Mediterranean hydrothermal vents. The physiological responses, abundance, and distribution of biotic components are elucidated, by focusing on the necto-benthic fauna and prokaryotic communities recognized to possess pivotal role in the marine ecosystem dynamics and as indicator species. The scientific interest in hydrothermal vents will be also reviewed by pointing out their relevance as source of bioactive molecules.
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Algan M, Sürmeli Y, Şanlı-Mohamed G. A novel thermostable xylanase from Geobacillus vulcani GS90: Production, biochemical characterization, and its comparative application in fruit juice enrichment. J Food Biochem 2021; 45:e13716. [PMID: 33788288 DOI: 10.1111/jfbc.13716] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Revised: 03/15/2021] [Accepted: 03/16/2021] [Indexed: 11/28/2022]
Abstract
Xylanases have great attention to act as a potential role in agro-industrial processes. In this study, production, characterization, and fruit juice application of novel xylanase from thermophilic Geobacillus vulcani GS90 (GvXyl) were performed. GvXyl was purified via acetone precipitation and gel-filtration chromatography. The results showed that GvXyl had 1,671.4 U/mg of specific activity and optimally worked at pH 8 and 55°C. It was also active in a wide pH (3-9) and temperature (30-90ºC) ranges. GvXyl was highly stable at 90ºC and relatively stable at pH 3-9. The kinetic parameters of GvXyl were obtained as Km , Vmax , and kcat ; 10.2 mg/ml, 4,104 µmol min-1 mg-1 , and 3,542.6 s-1 , respectively. GvXyl had higher action than commercial xylanase in fruit juice enrichment. These results revealed that GvXyl might possess a potential influence in fruit juice processing because of its high specific activity and great thermal stability. PRACTICAL APPLICATIONS: Polysaccharides include starch, pectin, and hemicellulose create problems by lowering fruit juice quality in beverages. To overcome this problem, various clarification processes might be applied to natural fruit juices. Even though chemicals are widely used for this purpose, recently enzymes including xylanases are preferred for obtaining high-quality products. In this study, we reported the production and biochemical characterization of novel thermostable xylanase from thermophilic G. vulcani GS90 (GvXyl). Also, apple and orange juice enrichment were performed with the novel xylanase to increase the quality in terms of yield, clarity, and reducing sugar substance. The improved quality features of apple and orange juices with GvXyl was then compared to commercially available β-1,4-xylanase. The results revealed that GvXyl might possess a potential influence in fruit juice processing because of its high specific activity and great thermal stability.
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Affiliation(s)
- Müge Algan
- Department of Biotechnology and Bioengineering, İzmir Institute of Technology, İzmir, Turkey
| | - Yusuf Sürmeli
- Department of Biotechnology and Bioengineering, İzmir Institute of Technology, İzmir, Turkey.,Department of Agricultural Biotechnology, Tekirdağ Namık Kemal University, Tekirdağ, Turkey
| | - Gülşah Şanlı-Mohamed
- Department of Biotechnology and Bioengineering, İzmir Institute of Technology, İzmir, Turkey.,Science Faculty, Department of Chemistry, İzmir Institute of Technology, İzmir, Turkey
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Baykara SG, Sürmeli Y, Şanlı-Mohamed G. Purification and Biochemical Characterization of a Novel Thermostable Serine Protease from Geobacillus sp. GS53. Appl Biochem Biotechnol 2021; 193:1574-1584. [PMID: 33507494 DOI: 10.1007/s12010-021-03512-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Accepted: 01/18/2021] [Indexed: 11/24/2022]
Abstract
Proteases account for approximately 60% of the enzyme market in the world, and they are used in various industrial applications including the detergent industry. In this study, production and characterization of a novel serine protease of thermophilic Geobacillus sp. GS53 from Balçova geothermal region, İzmir, Turkey, were performed. The thermostable protease was purified through ammonium sulfate precipitation and anion-exchange chromatography. The results showed that the protease had 137.8 U mg-1 of specific activity and optimally worked at 55 oC and pH 8. It was also active in a broad pH (4-10) and temperature (25-75 °C) ranges. The protease was highly stable at 85 °C and demonstrated relative stability at pH 4, 7, and 10. Also, the enzyme had high stability against organic solvents and surfactants; enzyme relative activity did not decrease below 81% upon preincubation for 10 min. Ca2+, Cu2+, and Zn2+ ions slightly induced protease activity. The protease was highly specific to casein, skim milk, Hammerstein casein, and BSA substrates. These results revealed that the protease might have a potential effect in a variety of industrial fields, especially the detergent industry, because of its high thermostability and stability to surfactants.
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Affiliation(s)
- Seden Güracar Baykara
- Department of Biotechnology and Bioengineering, İzmir Institute of Technology, 35430, İzmir, Turkey
| | - Yusuf Sürmeli
- Department of Biotechnology and Bioengineering, İzmir Institute of Technology, 35430, İzmir, Turkey.,Department of Agricultural Biotechnology, Tekirdağ Namık Kemal University, 59030, Tekirdağ, Turkey
| | - Gülşah Şanlı-Mohamed
- Department of Biotechnology and Bioengineering, İzmir Institute of Technology, 35430, İzmir, Turkey. .,Department of Chemistry, İzmir Institute of Technology, 35430, İzmir, Turkey.
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Burhanoğlu T, Sürmeli Y, Şanlı-Mohamed G. Identification and characterization of novel thermostable α-amylase from Geobacillus sp. GS33. Int J Biol Macromol 2020; 164:578-585. [PMID: 32693140 DOI: 10.1016/j.ijbiomac.2020.07.171] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Revised: 07/15/2020] [Accepted: 07/16/2020] [Indexed: 01/29/2023]
Abstract
In this study, the heterologous expression and biochemical characterization of a thermostable α-amylase from Geobacillus sp. GS33 was investigated. The recombinant α-amylase was overexpressed in Escherichia coli BL21 (λDE) and purified via anion exchange and size-exclusion chromatography. The purified α-amylase had a molecular weight of about 60 kDa, and was active in a broad range of pH 3-10 and temperature (40-90 °C) with maximum activity at pH 7-8 and 60 °C. The enzyme retained 50% residual activity at 65 °C, but only 20% at 85 °C after 16 h. At pH 9 and pH 7, the residual activity at 65 °C was 50% and 30%, respectively. The enzyme was remarkably activated by Co2+, Ca2+, Mg2+, PMSF, DTT, and Triton X-100, but partially inhibited by Cu2+, methanol, hexane, ethanol, acetone, SDS, and Tween 20. A molecular phylogeny analysis showed that the enzyme's amino acid sequence had the closest connection with an α-amylase from Geobacillus thermoleovorans subsp. stromboliensis nov. 3D-structure-based amino acid sequence alignments revealed that the three catalytic residues (D217, E246, D314) and the four Ca2+ ion coordination residues (N143, E177, D186, H221) were conserved in α-amylase from Geobacillus sp. GS33. The temperature stability and neutral pH optimum suggest that the enzyme may be useful for industrial applications.
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Affiliation(s)
- Tülin Burhanoğlu
- Department of Biotechnology and Bioengineering, İzmir Institute of Technology, 35430 İzmir, Turkey; Department of Chemistry, Gebze Technical University, 41400 Kocaeli, Turkey
| | - Yusuf Sürmeli
- Department of Biotechnology and Bioengineering, İzmir Institute of Technology, 35430 İzmir, Turkey; Department of Agricultural Biotechnology, Tekirdağ Namık Kemal University, 59030 Tekirdağ, Turkey
| | - Gülşah Şanlı-Mohamed
- Department of Biotechnology and Bioengineering, İzmir Institute of Technology, 35430 İzmir, Turkey; Department of Chemistry, İzmir Institute of Technology, 35430 İzmir, Turkey.
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Sürmeli Y, İlgü H, Şanlı-Mohamed G. Improved activity of α-L-arabinofuranosidase from Geobacillus vulcani GS90 by directed evolution: Investigation on thermal and alkaline stability. Biotechnol Appl Biochem 2018; 66:101-107. [PMID: 30334285 DOI: 10.1002/bab.1702] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2018] [Accepted: 10/13/2018] [Indexed: 02/06/2023]
Abstract
α-L-Arabinofuranosidase (Abf) is a potential enzyme because of its synergistic effect with other hemicellulases in agro-industrial field. In this study, directed evolution was applied to Abf from Geobacillus vulcani GS90 (GvAbf) using one round error-prone PCR and constructed a library of 73 enzyme variants of GvAbf. The activity screening of the enzyme variants was performed on soluble protein extracts using p-nitrophenyl α-L-arabinofuranoside as substrate. Two high activity displaying variants (GvAbf L307S and GvAbf Q90H/L307S) were selected, purified, partially characterized, and structurally analyzed. The specific activities of both variants were almost 2.5-fold more than that of GvAbf. Both GvAbf variants also exhibited higher thermal stability but lower alkaline stability in reference to GvAbf. The structural analysis of GvAbf model indicated that two mutation sites Q90H and L307S in both GvAbf variants are located in TIM barrel domain, responsible for catalytic action in many Glycoside Hydrolase Families including GH51. The structure of GvAbf model displayed that the position of L307S mutation is closer to the catalytic residues of GvAbf compared with Q90H mutation and also L307S mutation is conserved in both variants of GvAbf. Therefore, it was hypothesized that L307S amino acid substitution may play a critical role in catalytic activity of GvAbf.
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Affiliation(s)
- Yusuf Sürmeli
- Department of Biotechnology and Bioengineering, İzmir Institute of Technology, İzmir, Turkey
| | - Hüseyin İlgü
- Department of Chemistry, İzmir Institute of Technology, İzmir, Turkey
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A thermophilic α-l-Arabinofuranosidase from Geobacillus vulcani GS90: heterologous expression, biochemical characterization, and its synergistic action in fruit juice enrichment. Eur Food Res Technol 2018. [DOI: 10.1007/s00217-018-3075-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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10
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Özdemir S, Okumus V, Ulutas MS, Dundar A, Akarsubasic AT, Dumontet S. Production and characterization of thermostable α-amylase from thermophilicAnoxybacillus flavithermussp. nov. SO-19. STARCH-STARKE 2016. [DOI: 10.1002/star.201500071] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Sadin Özdemir
- Department of Biology, Siirt University; Science and Arts Faculty, 56100 Siirt; Turkey
| | - Veysi Okumus
- Department of Biology, Siirt University; Science and Arts Faculty, 56100 Siirt; Turkey
| | - Mehmet Sefa Ulutas
- Department of Biology, Siirt University; Science and Arts Faculty, 56100 Siirt; Turkey
| | - Abdurrahman Dundar
- Medical Promotion and Marketing Program; Vocational Higher School of Health Services, Mardin Artuklu University, Mardin; Turkey
| | - Alper Tunga Akarsubasic
- Department of Molecular Biology and Genetics; Istanbul Technical University, Maslak, 34469 Istanbul; Turkey
| | - Stefano Dumontet
- Department of Environmental Science; Parthenope University, Naples; Italy
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Sahay H, Babu BK, Singh S, Kaushik R, Saxena AK, Arora DK. Cold-active hydrolases producing bacteria from two different sub-glacial Himalayan lakes. J Basic Microbiol 2012; 53:703-14. [PMID: 22961722 DOI: 10.1002/jobm.201200126] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2012] [Accepted: 06/06/2012] [Indexed: 11/09/2022]
Abstract
Microorganisms, native to the cold environments have successfully acclimatized their physiological, metabolic, and biological features, exhibiting uniqueness in their enzymes, proteins, and membrane structures. These cold-active enzymes have immense biotechnological potential. The diversity of culturable bacteria in two different water lakes (the sub-glacial freshwater and the brackish) of Himalayas was analyzed using SYBR green staining and cultural methods. A total of 140 bacteria were isolated and were grouped as psychrophiles, psychrotrophs, and psychrotolerant organisms, based on their optimal temperature for growth. The amplified ribosomal DNA restriction analysis using three restriction enzymes facilitated the grouping of these isolates into 96 genotypes at ≥85% polymorphism. Phylogenetic analysis using 16S rRNA gene sequences revealed that the bacterial strains from both lakes belonged to Firmicutes, Proteobacteria (α, β, and γ) or Actinobacteria. Screening of the germplasm for the activity of different cold-active hydrolases such as protease, amylase, xylanase, and cellulase, revealed that about 16 isolates were positive, and exhibiting a wide range of stability at various temperature and pH. Our results suggest that the distinctly different ecosystems of sub-glacial freshwater and brackish water lakes have diverse groups of bacteria, which can be an excellent source of extracellular hydrolases with a wide range of thermal stability.
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Affiliation(s)
- Harmesh Sahay
- National Bureau of Agriculturally Important Microorganisms (NBAIM), Kusmaur, Mau, Uttar Pradesh, India.
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Akkaya B, Yenidunya AF, Akkaya R. Production and immobilization of a novel thermoalkalophilic extracellular amylase from bacilli isolate. Int J Biol Macromol 2012; 50:991-5. [DOI: 10.1016/j.ijbiomac.2012.02.011] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2011] [Revised: 02/08/2012] [Accepted: 02/09/2012] [Indexed: 10/28/2022]
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Deive FJ, Álvarez MS, Morán P, Sanromán MÁ, Longo MA. A process for extracellular thermostable lipase production by a novel Bacillus thermoamylovorans strain. Bioprocess Biosyst Eng 2012; 35:931-41. [DOI: 10.1007/s00449-011-0678-9] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2011] [Accepted: 12/31/2011] [Indexed: 11/28/2022]
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Molecular cloning, over expression and characterization of thermoalkalophilic esterases isolated from Geobacillus sp. Extremophiles 2010; 15:203-11. [PMID: 21181486 DOI: 10.1007/s00792-010-0344-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2010] [Accepted: 12/01/2010] [Indexed: 10/18/2022]
Abstract
Due to potential use for variety of biotechnological applications, genes encoding thermoalkalophilic esterase from three different Geobacillus strains isolated from thermal environmental samples in Balçova (Agamemnon) geothermal site were cloned and respective proteins were expressed in Escherichia coli (E.coli) and characterized in detail. Three esterases (Est1, Est2, Est3) were cloned directly by PCR amplification using consensus degenerate primers from genomic DNA of the strains Est1, Est2 and Est3 which were from mud, reinjection water and uncontrolled thermal leak, respectively. The genes contained an open reading frame (ORF) consisting of 741 bp for Est1 and Est2, which encoded 246 amino acids and ORF of Est3 was 729 bp encoded 242 amino acids. The esterase genes were expressed in E. coli and purified using His-Select HF nickel affinity gel. The molecular mass of the recombinant enzyme for each esterase was approximately 27.5 kDa. The three esterases showed high specific activity toward short chain p-NP esters. Recombinant Est1, Est2, Est3 have exhibited similar activity and the highest esterase activity of 1,100 U/mg with p-nitrophenyl acetate (pNPC(2)) as substrate was observed with Est1. All three esterase were most active around 65°C and pH 9.5-10.0. The effect of organic solvents, several metal ions, inhibitors and detergents on enzyme activity for purified Est1, Est2, Est3 were determined separately and compared.
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Deive FJ, Domínguez A, Barrio T, Moscoso F, Morán P, Longo MA, Sanromán MA. Decolorization of dye Reactive Black 5 by newly isolated thermophilic microorganisms from geothermal sites in Galicia (Spain). JOURNAL OF HAZARDOUS MATERIALS 2010; 182:735-742. [PMID: 20655659 DOI: 10.1016/j.jhazmat.2010.06.096] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2010] [Revised: 05/26/2010] [Accepted: 06/21/2010] [Indexed: 05/29/2023]
Abstract
In this study, thermophilic microbial strains from thermal spots in northwestern Spain displaying excellent decolorization capability were isolated. The research work tackled: (i) the ability of consortia to degrade a model di-azo dye Reactive Black at different pHs in flask cultures, obtaining that just neutral pHs licensed degradation levels near to 70%, (ii) the isolation of tree of the bacteria, which rendered possible reaching high levels of decolorization (80%) after just 24 h in aerobic conditions, and which were identified through 16S rRNA sequencing to possess high homology (99%) with Anoxybacillus pushchinoensis, Anoxybacillus kamchatkensis and Anoxybacillus flavithermus, and (iii) the cultivation of the isolates in a bench-scale bioreactor, which led to a decolorization rate two-fold higher than that obtained in flask cultures. Therefore, this work makes up the first time that a decolorization process of an azo dye by thermophilic microorganisms in aerobic conditions is investigated.
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Affiliation(s)
- F J Deive
- Department of Chemical Engineering, University of Vigo, 36310 Vigo, Spain
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Characterisation of a new thermoalkaliphilic bacterium for the production of high-quality hemp fibres, Geobacillus thermoglucosidasius strain PB94A. Appl Microbiol Biotechnol 2009; 83:521-7. [DOI: 10.1007/s00253-009-1969-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2008] [Revised: 03/16/2009] [Accepted: 03/16/2009] [Indexed: 11/26/2022]
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Cinar C, Apaydin O, Yenidunya AF, Harsa S, Gunes H. Isolation and characterization of Bacillus thuringiensis strains from olive-related habitats in Turkey. J Appl Microbiol 2007; 104:515-25. [PMID: 17927757 DOI: 10.1111/j.1365-2672.2007.03571.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
AIMS To isolate Bacillus thuringiensis strains from different olive-related habitats (olive groves and olive oil factories) in Turkey and to characterize these strains by molecular methods. METHODS AND RESULTS A total of 150 samples, consisting of olive grove soil, green olive leaves, olive leaf residues, animal faeces, olive pomace and dust, were examined for the presence of B. thuringiensis. One hundred B. thuringiensis strains were isolated from 54 environmental samples (36%) and characterized in terms of crystal morphology, cry and cyt gene content by polymerase chain reaction, plasmid profiles and 16S-internal transcribed spacer ribosomal DNA restriction fragment length polymorphism (16S-ITS rDNA RFLP). The highest percentage of samples containing B. thuringiensis was found in 38 out of 54 total soil samples (70%). Of the 100 B. thuringiensis isolates, the most frequent crystal shapes were irregularly shaped (24%), spherical-irregular pointed (19%), cuboidal (17%) and spherical (16%). The cry1 plus cry4 genotype was the most abundant genotype in our collection (21%). RFLP analysis of the amplified 16S-ITS rDNA revealed 11 distinct patterns for the isolates and 10 reference strains. CONCLUSIONS Bacillus thuringiensis isolates showed a great genetic diversity and crystal shape heterogeneity. SIGNIFICANCE AND IMPACT OF THE STUDY This is the first study on the isolation and characterization of B. thuringiensis from olive-related habitats in Turkey. No correlation was observed between the cry genotypes and insecticidal crystal shapes of the isolates. Restriction profiles of 23% of the isolates were found to be different from those of the 10 reference strains used.
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Affiliation(s)
- C Cinar
- Biotechnology Programme, Izmir Institute of Technology, Urla, Izmir, Turkey
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18
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Identification of enzyme-producing thermophilic bacilli isolated from marine vents of Aeolian Islands (Italy). ANN MICROBIOL 2007. [DOI: 10.1007/bf03175073] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Chatziefthimiou AD, Crespo-Medina M, Wang Y, Vetriani C, Barkay T. The isolation and initial characterization of mercury resistant chemolithotrophic thermophilic bacteria from mercury rich geothermal springs. Extremophiles 2007; 11:469-79. [PMID: 17401541 DOI: 10.1007/s00792-007-0065-2] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2006] [Accepted: 12/10/2006] [Indexed: 10/23/2022]
Abstract
Mercury rich geothermal springs are likely environments where mercury resistance is critical to microbial life and where microbe-mercury interactions may have evolved. Eleven facultative thermophilic and chemolithoautotrophic, thiosulfate oxidizing bacteria were isolated from thiosulfate enrichments of biofilms from mercury rich hot sulfidic springs in Mount Amiata, Italy. Some strains were highly resistant to mercury (>or=200 muM HgCl(2)) regardless of its presence or absence during primary enrichments, and three reduced ionic mercury to its elemental form. The gene encoding for the mercuric reductase enzyme (MerA), was amplified by PCR from seven strains. However, one highly resistant strain did not reduce mercury nor carried merA, suggesting an alternative resistance mechanism. All strains were members of the order Bacillales and were most closely related to previously described thermophiles belonging to the Firmicutes. Phylogenetic analyses clustered the MerA of the isolates in two supported novel nodes within the Firmicutes lineage and a comparison with the 16S rRNA gene tree suggested at least one case of horizontal gene transfer. Overall, the results show that the thermophilic thiosulfate oxidizing isolates were adapted to life in presence of mercury mostly, but not exclusively, by possessing MerA. These findings suggest that reduction of mercury by chemolithotrophic thermophilic bacteria may mobilize mercury from sulfur and iron deposits in geothermal environments.
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Affiliation(s)
- Aspassia D Chatziefthimiou
- Department of Biochemistry and Microbiology, Rutgers University, 76 Lipman Dr., New Brunswick, NJ 08901, USA
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Sudagidan M, Yenidunya AF, Gunes H. Identification of staphylococci by 16S internal transcribed spacer rRNA gene restriction fragment length polymorphism. J Med Microbiol 2005; 54:823-826. [PMID: 16091432 DOI: 10.1099/jmm.0.45868-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The capacity of 16S internal transcribed spacer (16S-ITS) rRNA gene RFLP to differentiate 16 type strains and nine clinical isolates of staphylococci was evaluated. The 16S rRNA gene was amplified together with the ITS region and the amplification products were digested with TaqI restriction enzyme. Analysis of the 16S-ITS rRNA gene RFLP profiles differentiated each of the 16 type strains into distinct RFLP haplotypes.
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Affiliation(s)
- Mert Sudagidan
- Department of Biology, Izmir Institute of Technology, 35430 Gulbahce, Urla, Izmir, Turkey
| | - A Fazil Yenidunya
- Department of Biology, Izmir Institute of Technology, 35430 Gulbahce, Urla, Izmir, Turkey
| | - Hatice Gunes
- Department of Biology, Izmir Institute of Technology, 35430 Gulbahce, Urla, Izmir, Turkey
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