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Irazoqui JM, Santiago GM, Mainez ME, Amadio AF, Eberhardt MF. Enzymes for production of whey protein hydrolysates and other value-added products. Appl Microbiol Biotechnol 2024; 108:354. [PMID: 38819482 PMCID: PMC11142983 DOI: 10.1007/s00253-024-13117-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2023] [Revised: 03/08/2024] [Accepted: 03/19/2024] [Indexed: 06/01/2024]
Abstract
Whey is a byproduct of dairy industries, the aqueous portion which separates from cheese during the coagulation of milk. It represents approximately 85-95% of milk's volume and retains much of its nutrients, including functional proteins and peptides, lipids, lactose, minerals, and vitamins. Due to its composition, mainly proteins and lactose, it can be considered a raw material for value-added products. Whey-derived products are often used to supplement food, as they have shown several physiological effects on the body. Whey protein hydrolysates are reported to have different activities, including antihypertensive, antioxidant, antithrombotic, opioid, antimicrobial, cytomodulatory, and immuno-modulatory. On the other hand, galactooligosaccharides obtained from lactose can be used as prebiotic for beneficial microorganisms for the human gastrointestinal tract. All these compounds can be obtained through physicochemical, microbial, or enzymatic treatments. Particularly, enzymatic processes have the advantage of being highly selective, more stable than chemical transformations, and less polluting, making that the global enzyme market grow at accelerated rates. The sources and different products associated with the most used enzymes are particularly highlighted in this review. Moreover, we discuss metagenomics as a tool to identify novel proteolytic enzymes, from both cultivable and uncultivable microorganisms, which are expected to have new interesting activities. Finally enzymes for the transformation of whey sugar are reviewed. In this sense, carbozymes with ß-galactosidase activity are capable of lactose hydrolysis, to obtain free monomers, and transgalactosylation for prebiotics production. KEY POINTS: • Whey can be used to obtain value-added products efficiently through enzymatic treatments • Proteases transform whey proteins into biopeptides with physiological activities • Lactose can be transformed into prebiotic compounds using ß-galactosidases.
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Affiliation(s)
- José Matías Irazoqui
- Instituto de Investigación de La Cadena Láctea (CONICET-INTA), 2300, Rafaela, Argentina
| | | | | | - Ariel Fernando Amadio
- Instituto de Investigación de La Cadena Láctea (CONICET-INTA), 2300, Rafaela, Argentina
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Esposito A, Del Duca S, Vitali F, Bigiotti G, Mocali S, Semenzato G, Papini A, Santini G, Mucci N, Padula A, Greco C, Nasanbat B, Davaakhuu G, Bazarragchaa M, Riga F, Augugliaro C, Cecchi L, Fani R, Zaccaroni M. The Great Gobi A Strictly Protected Area: Characterization of Soil Bacterial Communities from Four Oases. Microorganisms 2024; 12:320. [PMID: 38399724 PMCID: PMC10891509 DOI: 10.3390/microorganisms12020320] [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: 12/31/2023] [Revised: 01/30/2024] [Accepted: 02/01/2024] [Indexed: 02/25/2024] Open
Abstract
Understanding how microbial communities survive in extreme environmental pressure is critical for interpreting ecological patterns and microbial diversity. Great Gobi A Strictly Protected Area represents an intriguing model for studying the bacterial community since it is a protected and intact wild area of the Mongolian desert. In this work, the composition of a bacterial community of the soil from four oases was characterized by extracting total DNA and sequencing through the Illumina NovaSeq platform. In addition, the soil's chemical and physical properties were determined, and their influence on shaping the microbial communities was evaluated. The results showed a high variability of bacterial composition among oases. Moreover, combining specific chemical and physical parameters significantly shapes the bacterial community among oases. Data obtained suggested that the oases were highly variable in physiochemical parameters and bacterial communities despite the similar extreme climate conditions. Moreover, core functional microbiome were constituted by aerobic chemoheterotrophy and chemoheterotrophy, mainly contributed by the most abundant bacteria, such as Actinobacteriota, Pseudomonadota, and Firmicutes. This result supposes a metabolic flexibility for sustaining life in deserts. Furthermore, as the inhabitants of the extreme regions are likely to produce new chemical compounds, isolation of key taxa is thus encouraged.
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Affiliation(s)
- Antonia Esposito
- Council for Agricultural Research and Economics, Research Centre for Agriculture and Environment, 50125 Florence, Italy; (A.E.); (S.D.D.); (F.V.); (G.B.); (S.M.)
- Department of Biology, University of Florence, Via Madonna del Piano 6, Sesto Fiorentino, 50019 Florence, Italy; (G.S.); (A.P.); (G.S.)
| | - Sara Del Duca
- Council for Agricultural Research and Economics, Research Centre for Agriculture and Environment, 50125 Florence, Italy; (A.E.); (S.D.D.); (F.V.); (G.B.); (S.M.)
| | - Francesco Vitali
- Council for Agricultural Research and Economics, Research Centre for Agriculture and Environment, 50125 Florence, Italy; (A.E.); (S.D.D.); (F.V.); (G.B.); (S.M.)
| | - Gaia Bigiotti
- Council for Agricultural Research and Economics, Research Centre for Agriculture and Environment, 50125 Florence, Italy; (A.E.); (S.D.D.); (F.V.); (G.B.); (S.M.)
| | - Stefano Mocali
- Council for Agricultural Research and Economics, Research Centre for Agriculture and Environment, 50125 Florence, Italy; (A.E.); (S.D.D.); (F.V.); (G.B.); (S.M.)
| | - Giulia Semenzato
- Department of Biology, University of Florence, Via Madonna del Piano 6, Sesto Fiorentino, 50019 Florence, Italy; (G.S.); (A.P.); (G.S.)
| | - Alessio Papini
- Department of Biology, University of Florence, Via Madonna del Piano 6, Sesto Fiorentino, 50019 Florence, Italy; (G.S.); (A.P.); (G.S.)
| | - Giacomo Santini
- Department of Biology, University of Florence, Via Madonna del Piano 6, Sesto Fiorentino, 50019 Florence, Italy; (G.S.); (A.P.); (G.S.)
| | - Nadia Mucci
- Unit for Conservation Genetics (BIO-CGE), Institute for Environmental Protection and Research, Via Ca’ Fornacetta, 9, Ozzano dell’Emilia, 40064 Bologna, Italy; (N.M.); (A.P.); (C.G.)
| | - Anna Padula
- Unit for Conservation Genetics (BIO-CGE), Institute for Environmental Protection and Research, Via Ca’ Fornacetta, 9, Ozzano dell’Emilia, 40064 Bologna, Italy; (N.M.); (A.P.); (C.G.)
| | - Claudia Greco
- Unit for Conservation Genetics (BIO-CGE), Institute for Environmental Protection and Research, Via Ca’ Fornacetta, 9, Ozzano dell’Emilia, 40064 Bologna, Italy; (N.M.); (A.P.); (C.G.)
| | - Battogtokh Nasanbat
- Institute of Biology, Mongolian Academy of Sciences, Peace Avenue-54B, Bayanzurkh District, Ulaanbaatar 13330, Mongolia; (B.N.); (G.D.)
| | - Gantulga Davaakhuu
- Institute of Biology, Mongolian Academy of Sciences, Peace Avenue-54B, Bayanzurkh District, Ulaanbaatar 13330, Mongolia; (B.N.); (G.D.)
| | - Munkhtsetseg Bazarragchaa
- Department of Molecular Biology and Genetics, School of Bio-Medicine, Mongolian National University of Medical Sciences, Ulaanbaatar 14210, Mongolia;
| | - Francesco Riga
- Italian Institute for Environmental Protection and Research (ISPRA), Via Brancati 48, 00144 Rome, Italy;
| | | | - Lorenzo Cecchi
- Natural History Museum, Botanical Collections “Filippo Parlatore”—Via Giorgio la Pira 4, 50121 Florence, Italy;
| | - Renato Fani
- Department of Biology, University of Florence, Via Madonna del Piano 6, Sesto Fiorentino, 50019 Florence, Italy; (G.S.); (A.P.); (G.S.)
| | - Marco Zaccaroni
- Department of Biology, University of Florence, Via Madonna del Piano 6, Sesto Fiorentino, 50019 Florence, Italy; (G.S.); (A.P.); (G.S.)
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Irazoqui JM, Eberhardt MF, Santiago GM, Amadio AF. Characterization of novel proteases identified by metagenomic analysis from dairy stabilization ponds. Appl Microbiol Biotechnol 2023:10.1007/s00253-023-12591-4. [PMID: 37231159 DOI: 10.1007/s00253-023-12591-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Revised: 05/05/2023] [Accepted: 05/11/2023] [Indexed: 05/27/2023]
Abstract
Cheese whey is the main by-product of dairy industries. It is used as a raw material for other value-added products, like whey protein concentrate. By using enzymes, this product can be further treated to obtain new higher value products, like whey protein hydrolysates. Proteases (EC: 3.4) represent a large segment of industrial enzymes, since they are used in several industries, including food. In this work, we describe three novel enzymes identified using a metagenomic approach. Metagenomic DNA from dairy industry stabilization ponds were sequenced, and the predicted genes were compared against the MEROPS database, focusing on families commercially used to produce whey protein hydrolysates. From a total of 849 candidates, 10 were selected for cloning and expression and three showed activities with both the chromogenic substrate, azocasein, and whey proteins. Particularly, Pr05, an enzyme from the yet uncultured phylum Patescibacteria, showed activity that is comparable to a commercial protease. All these novel enzymes could represent an alternative for dairy industries to produce value-added products from industrial by-products. KEY POINTS: • Over 19,000 proteases were predicted in a sequence-based metagenomic analysis. • Three proteases were successfully expressed and showed activity with whey proteins. • The enzyme Pr05 showed hydrolysis profiles of interest for food industry.
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Affiliation(s)
- José Matías Irazoqui
- Instituto de Investigación de La Cadena Láctea (CONICET-INTA), 2300, Rafaela, Argentina
| | | | | | - Ariel Fernando Amadio
- Instituto de Investigación de La Cadena Láctea (CONICET-INTA), 2300, Rafaela, Argentina
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Metagenomic Approaches as a Tool to Unravel Promising Biocatalysts from Natural Resources: Soil and Water. Catalysts 2022. [DOI: 10.3390/catal12040385] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Natural resources are considered a promising source of microorganisms responsible for producing biocatalysts with great relevance in several industrial areas. However, a significant fraction of the environmental microorganisms remains unknown or unexploited due to the limitations associated with their cultivation in the laboratory through classical techniques. Metagenomics has emerged as an innovative and strategic approach to explore these unculturable microorganisms through the analysis of DNA extracted from environmental samples. In this review, a detailed discussion is presented on the application of metagenomics to unravel the biotechnological potential of natural resources for the discovery of promising biocatalysts. An extensive bibliographic survey was carried out between 2010 and 2021, covering diverse metagenomic studies using soil and/or water samples from different types and locations. The review comprises, for the first time, an overview of the worldwide metagenomic studies performed in soil and water and provides a complete and global vision of the enzyme diversity associated with each specific environment.
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Isolation and biochemical characterization of a novel serine protease identified from solid tannery waste metagenome. Biologia (Bratisl) 2021. [DOI: 10.1007/s11756-021-00832-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Two-step functional screen on multiple proteinaceous substrates reveals temperature-robust proteases with a broad-substrate range. Appl Microbiol Biotechnol 2021; 105:3195-3209. [PMID: 33770243 PMCID: PMC8053189 DOI: 10.1007/s00253-021-11235-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2020] [Revised: 02/15/2021] [Accepted: 03/14/2021] [Indexed: 01/21/2023]
Abstract
Abstract To support the bio-based industry in development of environment-friendly processes and products, an optimal toolbox of biocatalysts is key. Although functional screen of (meta)genomic libraries may potentially contribute to identifying new enzymes, the discovery of new enzymes meeting industry compliance demands is still challenging. This is particularly noticeable in the case of proteases, for which the reports of metagenome-derived proteases with industrial applicability are surprisingly limited. Indeed, proteolytic clones have been typically assessed by its sole activity on casein or skim milk and limited to mild screening conditions. Here, we demonstrate the use of six industry-relevant animal and plant by-products, namely bone, feather, blood meals, gelatin, gluten, and zein, as complementary substrates in functional screens and show the utility of temperature as a screening parameter to potentially discover new broad-substrate range and robust proteases for the biorefinery industry. By targeting 340,000 clones from two libraries of pooled isolates of mesophilic and thermophilic marine bacteria and two libraries of microbial communities inhabiting marine environments, we identified proteases in four of eleven selected clones that showed activity against all substrates herein tested after prolonged incubation at 55 °C. Following sequencing, in silico analysis and recombinant expression in Escherichia coli, one functional protease, 58% identical at sequence level to previously reported homologs, was found to readily hydrolyze highly insoluble zein at temperatures up to 50 °C and pH 9–11. It is derived from a bacterial group whose ability to degrade zein was unknown. This study reports a two-step screen resulting in identification of a new marine metagenome-derived protease with zein-hydrolytic properties at common biomass processing temperatures that could be useful for the modern biorefinery industry. Key points • A two-step multi-substrate strategy for discovery of robust proteases. • Feasible approach for shortening enzyme optimization to industrial demands. • A new temperature-tolerant protease efficiently hydrolyzes insoluble zein. Supplementary Information The online version contains supplementary material available at 10.1007/s00253-021-11235-9.
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Holstein JM, Gylstorff C, Hollfelder F. Cell-free Directed Evolution of a Protease in Microdroplets at Ultrahigh Throughput. ACS Synth Biol 2021; 10:252-257. [PMID: 33502841 PMCID: PMC7901014 DOI: 10.1021/acssynbio.0c00538] [Citation(s) in RCA: 42] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
![]()
Compartmentalization
of single genes in water-in-oil emulsion droplets
is a powerful approach to create millions of reactors for enzyme library
selections. When these droplets are formed at ultrahigh throughput
in microfluidic devices, their perfect monodispersity allows quantitative
enzyme assays with a high precision readout. However, despite its
potential for high quality cell-free screening experiments, previous
demonstrations of enrichment have never been successfully followed
up by actual enzyme library selections in monodisperse microfluidic
droplets. Here we develop a three-step workflow separating three previously
incompatible steps that thus far could not be carried out at once:
first droplet-compartmentalized DNA is amplified by rolling circle
amplification; only after completion of this step are reagents for in vitro protein expression and, finally, substrate added
via picoinjection. The segmented workflow is robust enough to allow
the first in vitro evolution in droplets, improving
the protease Savinase that is toxic to E. coli for
higher activity and identifying a 5-fold faster enzyme.
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Affiliation(s)
- Josephin M. Holstein
- Department of Biochemistry, University of Cambridge, 80 Tennis Court Road, Cambridge, CB2 1GA, U.K
| | - Christian Gylstorff
- Department of Biochemistry, University of Cambridge, 80 Tennis Court Road, Cambridge, CB2 1GA, U.K
| | - Florian Hollfelder
- Department of Biochemistry, University of Cambridge, 80 Tennis Court Road, Cambridge, CB2 1GA, U.K
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Metagenomic identification, purification and characterisation of the Bifidobacterium adolescentis BgaC β-galactosidase. Appl Microbiol Biotechnol 2021; 105:1063-1078. [PMID: 33427933 PMCID: PMC7843569 DOI: 10.1007/s00253-020-11084-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Revised: 12/19/2020] [Accepted: 12/27/2020] [Indexed: 11/27/2022]
Abstract
Members of the human gut microbiota use glycoside hydrolase (GH) enzymes, such as β-galactosidases, to forage on host mucin glycans and dietary fibres. A human faecal metagenomic fosmid library was constructed and functionally screened to identify novel β-galactosidases. Out of the 16,000 clones screened, 30 β-galactosidase-positive clones were identified. The β-galactosidase gene found in the majority of the clones was BAD_1582 from Bifidobacterium adolescentis, subsequently named bgaC. This gene was cloned with a hexahistidine tag, expressed in Escherichia coli and His-tagged-BgaC was purified using Ni2+-NTA affinity chromatography and size filtration. The enzyme had optimal activity at pH 7.0 and 37 °C, with a wide range of pH (4–10) and temperature (0–40 °C) stability. It required a divalent metal ion co-factor; maximum activity was detected with Mg2+, while Cu2+ and Mn2+ were inhibitory. Kinetic parameters were determined using ortho-nitrophenyl-β-d-galactopyranoside (ONPG) and lactose substrates. BgaC had a Vmax of 107 μmol/min/mg and a Km of 2.5 mM for ONPG and a Vmax of 22 μmol/min/mg and a Km of 3.7 mM for lactose. It exhibited low product inhibition by galactose with a Ki of 116 mM and high tolerance for glucose (66% activity retained in presence of 700 mM glucose). In addition, BgaC possessed transglycosylation activity to produce galactooligosaccharides (GOS) from lactose, as determined by TLC and HPLC analysis. The enzymatic characteristics of B. adolescentis BgaC make it an ideal candidate for dairy industry applications and prebiotic manufacture. Key points • Bifidobacterium adolescentis BgaC β-galactosidase was selected from human faecal metagenome. • BgaC possesses sought-after properties for biotechnology, e.g. low product inhibition. • BgaC has transglycosylation activity producing prebiotic oligosaccharides. Graphical Abstract ![]()
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DeCastro ME, Doane MP, Dinsdale EA, Rodríguez-Belmonte E, González-Siso MI. Exploring the taxonomical and functional profile of As Burgas hot spring focusing on thermostable β-galactosidases. Sci Rep 2021; 11:101. [PMID: 33420292 PMCID: PMC7794327 DOI: 10.1038/s41598-020-80489-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2020] [Accepted: 12/17/2020] [Indexed: 01/29/2023] Open
Abstract
In the present study we investigate the microbial community inhabiting As Burgas geothermal spring, located in Ourense (Galicia, Spain). The approximately 23 Gbp of Illumina sequences generated for each replicate revealed a complex microbial community dominated by Bacteria in which Proteobacteria and Aquificae were the two prevalent phyla. An association between the two most prevalent genera, Thermus and Hydrogenobacter, was suggested by the relationship of their metabolism. The high relative abundance of sequences involved in the Calvin-Benson cycle and the reductive TCA cycle unveils the dominance of an autotrophic population. Important pathways from the nitrogen and sulfur cycle are potentially taking place in As Burgas hot spring. In the assembled reads, two complete ORFs matching GH2 beta-galactosidases were found. To assess their functional characterization, the two ORFs were cloned and overexpressed in E. coli. The pTsbg enzyme had activity towards o-Nitrophenyl-β-D-galactopyranoside (ONPG) and p-Nitrophenyl-β-D-fucopyranoside, with high thermal stability and showing maximal activity at 85 °C and pH 6, nevertheless the enzyme failed to hydrolyze lactose. The other enzyme, Tsbg, was unable to hydrolyze even ONPG or lactose. This finding highlights the challenge of finding novel active enzymes based only on their sequence.
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Affiliation(s)
- María-Eugenia DeCastro
- Grupo EXPRELA, Centro de Investigacións Científicas Avanzadas (CICA), Facultade de Ciencias, Universidade da Coruña, A Coruña, Spain
| | - Michael P Doane
- Department of Biology, San Diego State University, 5500 Campanile Dr., San Diego, CA, 92182, USA
- Syndey Institute of Marine Science, 19 Chowder Bay Rd, Mosman, NSW, 2088, Australia
| | - Elizabeth Ann Dinsdale
- Department of Biology, San Diego State University, 5500 Campanile Dr., San Diego, CA, 92182, USA
- College of Science and Engineering, Flinders University, Sturt Rd, Bedford Park, SA, 5042, Australia
| | - Esther Rodríguez-Belmonte
- Grupo EXPRELA, Centro de Investigacións Científicas Avanzadas (CICA), Facultade de Ciencias, Universidade da Coruña, A Coruña, Spain
| | - María-Isabel González-Siso
- Grupo EXPRELA, Centro de Investigacións Científicas Avanzadas (CICA), Facultade de Ciencias, Universidade da Coruña, A Coruña, Spain.
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Sun J, Li P, Liu Z, Huang W, Mao X. A novel thermostable serine protease from a metagenomic library derived from marine sediments in the East China Sea. Appl Microbiol Biotechnol 2020; 104:9229-9238. [PMID: 32965562 DOI: 10.1007/s00253-020-10879-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2020] [Revised: 08/07/2020] [Accepted: 09/02/2020] [Indexed: 01/01/2023]
Abstract
Thermal activity and stability are important characteristics for proteases applied in the detergent, pharmaceutical, food, and other green industries. With the intent to discover thermostable novel proteases, we constructed a fosmid metagenomic library from marine sediments in the East China Sea and isolated a clone endowed with high proteolytic activity from this library. Sequence analysis of the positive subclones allowed the identification of a coding region of 1254 bp related to protease activity. The unrooted phylogenetic tree and alignment results revealed that the sequence might be derived from Anaerolineaceae bacterium and encodes a new member of the peptidase S8A subfamily with the typical catalytic triad Asp119/His150/Ser325. The fusion protein, named pF1AL2, was expressed in Escherichia coli and showed a molecular weight of 35 kDa. pF1AL2 was active in the pH range of 5.0-11.0 with an optimal pH at 10.0 and had high stability under alkaline conditions, retaining more than 95% of its activity after 24 h at pH 11.0. The optimal temperature of pF1AL2 was 80 °C, and it retained nearly 80% of its activity after 6 h at 70 °C, showing great thermal activity and stability. In addition, the enzyme had great salt tolerance (the residual activity when kept in 3 M NaCl was 40%). Its thermal activity and stability, along with its halotolerance and pH-tolerance, indicate the high potential value of pF1AL2 in industrial applications. The exploitation of pF1AL2 could lay the foundation for the development and utilization of proteases with special features from marine resources by a metagenomic strategy. KEY POINTS: • A novel protease, pF1AL2, from marine sediments, was screened out by a metagenomic strategy. • The protease pF1AL2 analyzed in silico, cloned, and characterized. • pF1AL2 had an optimal temperature of 80 °C and retained nearly 80% of activity after 6 h at 70 °C. • pF1AL2 had great tolerance for high-temperature and acid, alkaline, and high salt environments.
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Affiliation(s)
- Jianan Sun
- College of Food Science and Engineering, Ocean University of China, Qingdao, 266003, China
| | - Ping Li
- College of Food Science and Engineering, Ocean University of China, Qingdao, 266003, China
| | - Zhen Liu
- College of Food Science and Engineering, Ocean University of China, Qingdao, 266003, China
| | - Wencan Huang
- College of Food Science and Engineering, Ocean University of China, Qingdao, 266003, China
| | - Xiangzhao Mao
- College of Food Science and Engineering, Ocean University of China, Qingdao, 266003, China. .,Laboratory for Marine Drugs and Bioproducts of Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266237, China.
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Kirubakaran R, ArulJothi KN, Revathi S, Shameem N, Parray JA. Emerging priorities for microbial metagenome research. BIORESOURCE TECHNOLOGY REPORTS 2020; 11:100485. [PMID: 32835181 PMCID: PMC7319936 DOI: 10.1016/j.biteb.2020.100485] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Revised: 06/23/2020] [Accepted: 06/24/2020] [Indexed: 12/20/2022]
Abstract
Overwhelming anthropogenic activities lead to deterioration of natural resources and the environment. The microorganisms are considered desirable, due to their suitability for easy genetic manipulation and handling. With the aid of modern biotechnological techniques, the culturable microorganisms have been widely exploited for the benefit of mankind. Metagenomics, a powerful tool to access the abundant biodiversity of the environmental samples including the unculturable microbes, to determine microbial diversity and population structure, their ecological roles and expose novel genes of interest. This review focuses on the microbial adaptations to the adverse environmental conditions, metagenomic techniques employed towards microbial biotechnology. Metagenomic approach helps to understand microbial ecology and to identify useful microbial derivatives like antibiotics, toxins, and enzymes with diverse and enhanced function. It also summarizes the application of metagenomics in clinical diagnosis, improving microbial ecology, therapeutics, xenobiotic degradation and impact on agricultural crops.
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Affiliation(s)
| | - K N ArulJothi
- Department of Genetic Engineering, SRM Institute of Science and Technology, Chennai, India
- Department of Human Biology, University of Cape Town, Cape Town, South Africa
| | | | - Nowsheen Shameem
- Department of Environmental Science, Cluster University Srinagar, J&K, India
| | - Javid A Parray
- Department of Environmental Science, Govt SAM Degree College Budgam, J&K, India
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Al-Quwaie DAH. Bacterial community dynamics with rhizosphere of Calotropis procera and Senna alexandrina desert plants in Saudi Arabia. Bioinformation 2020; 16:567-578. [PMID: 33214744 PMCID: PMC7649021 DOI: 10.6026/97320630016567] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Accepted: 06/12/2020] [Indexed: 12/30/2022] Open
Abstract
It is of interest to study the rhizobacteria associated with two different desert wild plants, e.g., Calotropis procera and Senna alexandrina compared with bulk soil sample in order to identify signatures of microbes in rhizospheres of the two plants and detect influence of soil microbiome in drawing soil architecture. Analysis of deep sequencing microbial dataset indicated occurrence of 296,642 sequence tags assigned 5,210 OTUs (operational taxonomic units). Species richness in control sample was higher than those of either plant's rhizosphere, while microbial abundance was lower. Principal coordinate analysis (PCoA) plot indicated complete separation of microbiome diversity among groups. Abundances of Pseudomonas stutzeri and Virgibacillus koreensis increased in the rhizosphere of C. procera compared with that of S. alexandrina, while those of Streptococcus sobrinus, Veillonella parvula and unassigned species of Sphingomonas genus increased in rhizosphere of S. alexandrina. Unassigned species of genera Marinobacter, Porticoccus and Alcanivorax only exist in rhizosphere microbiome of C. procera, while unassigned species of genus Pseudomonas only exists in rhizosphere microbiome of Senna alexandrina. High abundances of the two microbes Pseudomonas stutzeri and Virgibacillus koreensis in rhizosphere of C. procera allow the plant to grow well under both normal and saline condition. Also, Marinobacter, Porticoccus and Alcanivorax genera only exist in rhizosphere microbiome of C. procera. These microbes produce siderophores that protect plant from pathogens. Data shows that C. procera might be more protected from microbial pathogens compared with S. alexandrina. The differential abundances or exclusive presence of soil microbes reflect the ability of plant species to survive under biotic and abiotic stresses. Results imply that rhizospheric microbes can be used as biomarkers of plant growth rate and the ability to survive under harsh conditions.
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Affiliation(s)
- Diana AH Al-Quwaie
- Department of Biological Sciences, Rabigh College of Science and Arts, King Abdulaziz University (KAU), Rabigh, Saudi Arabia
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Calderon D, Peña L, Suarez A, Villamil C, Ramirez-Rojas A, Anzola JM, García-Betancur JC, Cepeda ML, Uribe D, Del Portillo P, Mongui A. Recovery and functional validation of hidden soil enzymes in metagenomic libraries. Microbiologyopen 2019; 8:e00572. [PMID: 30851083 PMCID: PMC6460280 DOI: 10.1002/mbo3.572] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2017] [Revised: 11/01/2017] [Accepted: 11/09/2017] [Indexed: 11/10/2022] Open
Abstract
The vast microbial diversity on the planet represents an invaluable source for identifying novel activities with potential industrial and therapeutic application. In this regard, metagenomics has emerged as a group of strategies that have significantly facilitated the analysis of DNA from multiple environments and has expanded the limits of known microbial diversity. However, the functional characterization of enzymes, metabolites, and products encoded by diverse microbial genomes is limited by the inefficient heterologous expression of foreign genes. We have implemented a pipeline that combines NGS and Sanger sequencing as a way to identify fosmids within metagenomic libraries. This strategy facilitated the identification of putative proteins, subcloning of targeted genes and preliminary characterization of selected proteins. Overall, the in silico approach followed by the experimental validation allowed us to efficiently recover the activity of previously hidden enzymes derived from agricultural soil samples. Therefore, the methodology workflow described herein can be applied to recover activities encoded by environmental DNA from multiple sources.
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Affiliation(s)
- Dayana Calderon
- Molecular Biotechnology Research Group, Corporación CorpoGen, Bogotá, Colombia
| | - Luis Peña
- Leibniz Institute for Natural Product Research and Infection Biology - Hans Knöll Institute, Friedrich-Schiller Universität, Jena, Germany
| | - Angélica Suarez
- Molecular Biotechnology Research Group, Corporación CorpoGen, Bogotá, Colombia
| | - Carolina Villamil
- Molecular Biotechnology Research Group, Corporación CorpoGen, Bogotá, Colombia
| | - Adan Ramirez-Rojas
- Molecular Biotechnology Research Group, Corporación CorpoGen, Bogotá, Colombia
| | - Juan M Anzola
- Computational Biology, Corporación CorpoGen, Bogotá, Colombia
| | | | - Martha L Cepeda
- Molecular Biotechnology Research Group, Corporación CorpoGen, Bogotá, Colombia
| | - Daniel Uribe
- Biotechnology Institute, Universidad Nacional de Colombia, Bogotá, Colombia
| | | | - Alvaro Mongui
- Molecular Biotechnology Research Group, Corporación CorpoGen, Bogotá, Colombia.,Department of Biological Sciences, Universidad de los Andes, Bogotá, Colombia
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15
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Ngara TR, Zhang H. Recent Advances in Function-based Metagenomic Screening. GENOMICS PROTEOMICS & BIOINFORMATICS 2018; 16:405-415. [PMID: 30597257 PMCID: PMC6411959 DOI: 10.1016/j.gpb.2018.01.002] [Citation(s) in RCA: 77] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Revised: 01/05/2018] [Accepted: 01/09/2018] [Indexed: 12/01/2022]
Abstract
Metagenomes from uncultured microorganisms are rich resources for novel enzyme genes. The methods used to screen the metagenomic libraries fall into two categories, which are based on sequence or function of the enzymes. The sequence-based approaches rely on the known sequences of the target gene families. In contrast, the function-based approaches do not involve the incorporation of metagenomic sequencing data and, therefore, may lead to the discovery of novel gene sequences with desired functions. In this review, we discuss the function-based screening strategies that have been used in the identification of enzymes from metagenomes. Because of its simplicity, agar plate screening is most commonly used in the identification of novel enzymes with diverse functions. Other screening methods with higher sensitivity are also employed, such as microtiter plate screening. Furthermore, several ultra-high-throughput methods were developed to deal with large metagenomic libraries. Among these are the FACS-based screening, droplet-based screening, and the in vivo reporter-based screening methods. The application of these novel screening strategies has increased the chance for the discovery of novel enzyme genes.
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Affiliation(s)
- Tanyaradzwa Rodgers Ngara
- Department of Biotechnology, College of Life Science and Technology, Huazhong University of Science and Technology, MOE Key Laboratory of Molecular Biophysics, Wuhan 430074, China
| | - Houjin Zhang
- Department of Biotechnology, College of Life Science and Technology, Huazhong University of Science and Technology, MOE Key Laboratory of Molecular Biophysics, Wuhan 430074, China.
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16
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Shamim K, Sharma J, Mutnale M, Dubey SK, Mujawar S. Characterization of a metagenomic serine metalloprotease and molecular docking studies. Process Biochem 2018. [DOI: 10.1016/j.procbio.2018.05.020] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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17
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Chen D, Wang D, Xu C, Chen C, Li J, Wu W, Huang X, Xie H. Nematicidal protease genes screened from a soil metagenomic library to control Radopholus similis mediated by Pseudomonas fluorescens pf36. Appl Microbiol Biotechnol 2018; 102:3301-3314. [DOI: 10.1007/s00253-018-8869-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2017] [Revised: 01/25/2018] [Accepted: 02/10/2018] [Indexed: 12/01/2022]
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18
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Gong BL, Mao RQ, Xiao Y, Jia ML, Zhong XL, Liu Y, Xu PL, Li G. Improvement of enzyme activity and soluble expression of an alkaline protease isolated from oil-polluted mud flat metagenome by random mutagenesis. Enzyme Microb Technol 2017; 106:97-105. [DOI: 10.1016/j.enzmictec.2017.06.015] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2016] [Revised: 06/19/2017] [Accepted: 06/28/2017] [Indexed: 11/16/2022]
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19
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Metagenome Analysis: a Powerful Tool for Enzyme Bioprospecting. Appl Biochem Biotechnol 2017; 183:636-651. [PMID: 28815469 DOI: 10.1007/s12010-017-2568-3] [Citation(s) in RCA: 61] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2017] [Accepted: 07/24/2017] [Indexed: 01/05/2023]
Abstract
Microorganisms are found throughout every corner of nature, and vast number of microorganisms is difficult to cultivate by classical microbiological techniques. The advent of metagenomics has revolutionized the field of microbial biotechnology. Metagenomics allow the recovery of genetic material directly from environmental niches without any cultivation techniques. Currently, metagenomic tools are widely employed as powerful tools to isolate and identify enzymes with novel biocatalytic activities from the uncultivable component of microbial communities. The employment of next-generation sequencing techniques for metagenomics resulted in the generation of large sequence data sets derived from various environments, such as soil, the human body and ocean water. This review article describes the state-of-the-art techniques and tools in metagenomics and discusses the potential of metagenomic approaches for the bioprospecting of industrial enzymes from various environmental samples. We also describe the unusual novel enzymes discovered via metagenomic approaches and discuss the future prospects for metagenome technologies.
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20
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Pessoa TBA, Rezende RP, Marques EDLS, Pirovani CP, Dos Santos TF, Dos Santos Gonçalves AC, Romano CC, Dotivo NC, Freitas ACO, Salay LC, Dias JCT. Metagenomic alkaline protease from mangrove sediment. J Basic Microbiol 2017; 57:962-973. [PMID: 28804942 DOI: 10.1002/jobm.201700159] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2017] [Revised: 06/29/2017] [Accepted: 07/07/2017] [Indexed: 11/09/2022]
Abstract
Functional screening of metagenomic libraries is an important tool for the discovery of new molecules. The metabolic diversity of microorganisms enables survival in harsh environments and is related to the production of enzymes. In this study, we identified a protease-producing clone from a metagenomic library derived from mangrove sediment. The protease was purified by ammonium sulphate precipitation and gel filtration chromatography, with a yield of 77.27% and a specific activity of 8.57 U μg-1 . It had a molecular weight of approximately 70 kDa. MS/MS in ESI-Q-TOF revealed nine peptides similar to a peptidase of Bacillus safensis. The aligned partial sequence showed 47.48% identity and 82.74% similarity to the conserved domains of a glutamyl aminopeptidase from the human gut metagenome and 32.12% total coverage. The protease had an optimal pH of 8.5 and optimal activity at 60°C. At pH 9-12, its activity was greater than 80%. It had moderate thermotolerance and thermostability at temperatures of 40 and 50 °C. The KM and Vmax values were estimated to be 0.92 mg ml-1 , and 13.15 mmol min-1 for azocasein. Substrate specificity analysis showed that PR4A3 was active on gelatin, blood, egg yolk, and milk. These results support the potential use of PR4A3 in biotechnological applications.
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Affiliation(s)
- Tharcilla B A Pessoa
- State University of Feira de Santana, Program in Biotechnology, Feira de Santana, Bahia, Brazil
| | - Rachel P Rezende
- Department of Biological Sciences, State University of Santa Cruz, Ilheus, Bahia, Brazil
| | | | - Carlos P Pirovani
- Department of Biological Sciences, State University of Santa Cruz, Ilheus, Bahia, Brazil
| | | | | | - Carla C Romano
- Department of Biological Sciences, State University of Santa Cruz, Ilheus, Bahia, Brazil
| | - Natielle C Dotivo
- State University of Santa Cruz, Undergraduate in Biomedicine, Ilheus, Bahia, Brazil
| | - Ana C O Freitas
- Department of Biological Sciences, State University of Santa Cruz, Ilheus, Bahia, Brazil
| | - Luiz C Salay
- Department of Exact and Technological Sciences, State University of Santa Cruz, Ilheus, Bahia, Brazil
| | - João C T Dias
- Department of Biological Sciences, State University of Santa Cruz, Ilheus, Bahia, Brazil
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21
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Khan M, Sathya TA. Extremozymes from metagenome: Potential applications in food processing. Crit Rev Food Sci Nutr 2017; 58:2017-2025. [PMID: 28605203 DOI: 10.1080/10408398.2017.1296408] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
The long-established use of enzymes for food processing and product formulation has resulted in an increased enzyme market compounding to 7.0% annual growth rate. Advancements in molecular biology and recognition that enzymes with specific properties have application for industrial production of infant, baby and functional foods boosted research toward sourcing the genes of microorganisms for enzymes with distinctive properties. In this regard, functional metagenomics for extremozymes has gained attention on the premise that such enzymes can catalyze specific reactions. Hence, metagenomics that can isolate functional genes of unculturable extremophilic microorganisms has expanded attention as a promising tool. Developments in this field of research in relation to food sector are reviewed.
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Affiliation(s)
- Mahejibin Khan
- a CSIR-Central Food Technological Research Institute-Resource Centre Lucknow , India.,c Academy of Scientific and Innovative Research , New Delhi , India
| | - T A Sathya
- b CSIR-Central Food Technological Research Institute , Mysore , India.,c Academy of Scientific and Innovative Research , New Delhi , India
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22
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Molecular cloning and characterization of a halotolerant α-amylase from marine metagenomic library derived from Arabian Sea sediments. 3 Biotech 2017; 7:65. [PMID: 28452011 DOI: 10.1007/s13205-017-0674-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2016] [Accepted: 02/27/2017] [Indexed: 10/19/2022] Open
Abstract
Functional screening of a metagenomic library of marine sediment revealed an amylolytic clone BTM109. This report states the purification and characterization of a moderately halotolerant α-amylase, with more than 51% activity in 2.5 M NaCl. The molecular mass of purified protein was determined to be 55.7 kDa by MALDI-TOF MS. The optimum pH for enzyme activity was pH 7 and temperature for maximal activity was 40 °C. At 5 mM concentration, Ca2+ enhanced the enzyme activity indicating that the enzyme is a Ca2+ dependent α-amylase which was confirmed by the starch hydrolysis pattern using TLC. These physico-chemical properties support the suitability of this enzyme for various industrial applications.
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23
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Characterization of a metagenome-derived protease from contaminated agricultural soil microorganisms and its random mutagenesis. Folia Microbiol (Praha) 2017; 62:499-508. [PMID: 28382524 DOI: 10.1007/s12223-017-0522-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2016] [Accepted: 03/17/2017] [Indexed: 12/28/2022]
Abstract
Proteases are typical key enzymes that hydrolyze proteins into amino acids and peptides. Numerous proteases have been studied, but the discovery of metagenome-derived proteases is still significant for both commercial applications and basic research. An unexplored protease gene sep1A was identified by function-based screening from a plasmid metagenomic library derived from uncultured contaminated agricultural soil microorganisms. The putative protease gene was subcloned into pET-32a (+) vector and overexpressed in E. coli BL21(DE3) pLysS, then the recombinant protein was purified to homogeneity. The detailed biochemical characterization of the Sep1A protein was performed, including its molecular characterization, specific activity, pH-activity profile, metal ion-activity profile, and enzyme kinetic assays. Furthermore, the protein engineering approach of random mutagenesis via error-prone PCR was applied on the original Sep1A protein. Biochemical characterization demonstrated that the purified recombinant Ep48 protein could hydrolyze casein. Compared with the original Sep1A protein, the best variant of Ep48 in the random mutagenesis library, with the Gln307Leu and Asp391Gly changes, exhibited 2.62-fold activity at the optimal reaction conditions of 50 °C and pH 9.0. These results are the first step toward a better understanding of the properties of Sep1A protein. Protein engineering with error-prone PCR paves the way toward the metagenome-derived genes for biotechnological applications.
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24
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DeCastro ME, Rodríguez-Belmonte E, González-Siso MI. Metagenomics of Thermophiles with a Focus on Discovery of Novel Thermozymes. Front Microbiol 2016; 7:1521. [PMID: 27729905 PMCID: PMC5037290 DOI: 10.3389/fmicb.2016.01521] [Citation(s) in RCA: 72] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2016] [Accepted: 09/12/2016] [Indexed: 11/24/2022] Open
Abstract
Microbial populations living in environments with temperatures above 50°C (thermophiles) have been widely studied, increasing our knowledge in the composition and function of these ecological communities. Since these populations express a broad number of heat-resistant enzymes (thermozymes), they also represent an important source for novel biocatalysts that can be potentially used in industrial processes. The integrated study of the whole-community DNA from an environment, known as metagenomics, coupled with the development of next generation sequencing (NGS) technologies, has allowed the generation of large amounts of data from thermophiles. In this review, we summarize the main approaches commonly utilized for assessing the taxonomic and functional diversity of thermophiles through metagenomics, including several bioinformatics tools and some metagenome-derived methods to isolate their thermozymes.
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Affiliation(s)
- María-Eugenia DeCastro
- Grupo EXPRELA, Centro de Investigacións Científicas Avanzadas (CICA), Departamento de Bioloxía Celular e Molecular, Facultade de Ciencias, Universidade da Coruña A Coruña, Spain
| | - Esther Rodríguez-Belmonte
- Grupo EXPRELA, Centro de Investigacións Científicas Avanzadas (CICA), Departamento de Bioloxía Celular e Molecular, Facultade de Ciencias, Universidade da Coruña A Coruña, Spain
| | - María-Isabel González-Siso
- Grupo EXPRELA, Centro de Investigacións Científicas Avanzadas (CICA), Departamento de Bioloxía Celular e Molecular, Facultade de Ciencias, Universidade da Coruña A Coruña, Spain
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25
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Abdul Majid S, Graw MF, Chatziefthimiou AD, Nguyen H, Richer R, Louge M, Sultan AA, Schloss P, Hay AG. Microbial Characterization of Qatari Barchan Sand Dunes. PLoS One 2016; 11:e0161836. [PMID: 27655399 PMCID: PMC5031452 DOI: 10.1371/journal.pone.0161836] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2016] [Accepted: 08/13/2016] [Indexed: 01/17/2023] Open
Abstract
This study represents the first characterization of sand microbiota in migrating barchan sand dunes. Bacterial communities were studied through direct counts and cultivation, as well as 16S rRNA gene and metagenomic sequence analysis to gain an understanding of microbial abundance, diversity, and potential metabolic capabilities. Direct on-grain cell counts gave an average of 5.3 ± 0.4 x 105 cells g-1 of sand. Cultured isolates (N = 64) selected for 16S rRNA gene sequencing belonged to the phyla Actinobacteria (58%), Firmicutes (27%) and Proteobacteria (15%). Deep-sequencing of 16S rRNA gene amplicons from 18 dunes demonstrated a high relative abundance of Proteobacteria, particularly enteric bacteria, and a dune-specific-pattern of bacterial community composition that correlated with dune size. Shotgun metagenome sequences of two representative dunes were analyzed and found to have similar relative bacterial abundance, though the relative abundances of eukaryotic, viral and enterobacterial sequences were greater in sand from the dune closer to a camel-pen. Functional analysis revealed patterns similar to those observed in desert soils; however, the increased relative abundance of genes encoding sporulation and dormancy are consistent with the dune microbiome being well-adapted to the exceptionally hyper-arid Qatari desert.
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Affiliation(s)
- Sara Abdul Majid
- Department of Research, Weill Cornell Medical Qatar, Qatar Foundation, Doha, Qatar
| | - Michael F. Graw
- Department of Microbiology, Cornell University, Ithaca, New York, United States of America
| | | | - Hanh Nguyen
- Department of Microbiology, Cornell University, Ithaca, New York, United States of America
| | - Renee Richer
- Department of Research, Weill Cornell Medical Qatar, Qatar Foundation, Doha, Qatar
| | - Michel Louge
- Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, New York, United States of America
| | - Ali A. Sultan
- Department of Research, Weill Cornell Medical Qatar, Qatar Foundation, Doha, Qatar
| | - Patrick Schloss
- Department of Microbiology and Immunology, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Anthony G. Hay
- Department of Microbiology, Cornell University, Ithaca, New York, United States of America
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26
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Apolinar-Hernández MM, Peña-Ramírez YJ, Pérez-Rueda E, Canto-Canché BB, De Los Santos-Briones C, O'Connor-Sánchez A. Identification and in silico characterization of two novel genes encoding peptidases S8 found by functional screening in a metagenomic library of Yucatán underground water. Gene 2016; 593:154-161. [PMID: 27522038 DOI: 10.1016/j.gene.2016.08.009] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2016] [Revised: 07/19/2016] [Accepted: 08/04/2016] [Indexed: 01/19/2023]
Abstract
Metagenomics is a culture-independent technology that allows access to novel and potentially useful genetic resources from a wide range of unknown microorganisms. In this study, a fosmid metagenomic library of tropical underground water was constructed, and clones were functionally screened for extracellular proteolytic activity. One of the positive clones, containing a 41,614-bp insert, had two genes with 60% and 68% identity respectively with a peptidase S8 of Chitinimonas koreensis. When these genes were individually sub-cloned, in both cases their sub-clones showed proteolytic phenotype, confirming that they both encode functional proteases. These genes -named PrAY5 and PrAY6- are next to each other. They are similar in size (1845bp and 1824bp respectively) and share 66.5% identity. An extensive in silico characterization showed that their ORFs encode complex zymogens having a signal peptide at their 5' end, followed by a pro-peptide, a catalytic region, and a PPC domain at their 3' end. Their translated sequences were classified as peptidases S8A by sequence comparisons against the non-redundant database and corroborated by Pfam and MEROPS. Phylogenetic analysis of the catalytic region showed that they encode novel proteases that clustered with the sub-family S8_13, which according to the CDD database at NCBI, is an uncharacterized subfamily. They clustered in a clade different from the other three proteases S8 found so far by functional metagenomics, and also different from proteases S8 found in sequenced environmental samples, thereby expanding the range of potentially useful proteases that have been identified by metagenomics. I-TASSER modeling corroborated that they may be subtilases, thus possibly they participate in the hydrolysis of proteins with broad specificity for peptide bonds, and have a preference for a large uncharged residue in P1.
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Affiliation(s)
- Max M Apolinar-Hernández
- Unidad de Biotecnología, Centro de Investigación Científica de Yucatán A.C., Calle 43 No. 130, Chuburná de Hidalgo, Mérida, Yucatán CP 97200, Mexico
| | - Yuri J Peña-Ramírez
- El Colegio de la Frontera Sur (ECOSUR) Unidad Campeche, Avenida Rancho Polígono 2A, Ciudad Industrial Lerma, Campeche, Campeche CP 24500, Mexico
| | - Ernesto Pérez-Rueda
- Departamento de Ingeniería Celular y Biocatálisis, Instituto de Biotecnología, UNAM, Cuernavaca, Morelos CP 62210, Mexico
| | - Blondy B Canto-Canché
- Unidad de Biotecnología, Centro de Investigación Científica de Yucatán A.C., Calle 43 No. 130, Chuburná de Hidalgo, Mérida, Yucatán CP 97200, Mexico
| | - César De Los Santos-Briones
- Unidad de Biotecnología, Centro de Investigación Científica de Yucatán A.C., Calle 43 No. 130, Chuburná de Hidalgo, Mérida, Yucatán CP 97200, Mexico
| | - Aileen O'Connor-Sánchez
- Unidad de Biotecnología, Centro de Investigación Científica de Yucatán A.C., Calle 43 No. 130, Chuburná de Hidalgo, Mérida, Yucatán CP 97200, Mexico.
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Devi SG, Fathima AA, Sanitha M, Iyappan S, Curtis WR, Ramya M. Expression and characterization of alkaline protease from the metagenomic library of tannery activated sludge. J Biosci Bioeng 2016; 122:694-700. [PMID: 27323930 DOI: 10.1016/j.jbiosc.2016.05.012] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2016] [Revised: 05/24/2016] [Accepted: 05/30/2016] [Indexed: 11/17/2022]
Abstract
Metagenomics has the potential to facilitate the discovery of novel enzymes; however, to date, only a few alkaline proteases have been characterized from environmentally-sourced DNA. We report the identification and characterization of an alkaline serine protease designated as Prt1A from the metagenomic library of tannery activated sludge. Sequence analysis revealed that Prt1A is closely related to S8A family subtilisins with a catalytic triad of Asp143, His173, and Ser326. The putative protease gene (prt-1A) was subcloned in pET 28a (+) vector and overexpressed in Escherichia coli BL21(DE3)pLysS cells. This 38.8 KDa recombinant protease was purified to homogeneity by nickel affinity chromatography and exhibited optimal enzyme activity at elevated pH (11.0) and temperature (55°C). The enzyme activity was enhanced by the addition of 5 mM Ca2+ ions, and was stable in the presence of anionic detergent, oxidizing agent and various organic solvents. The enzyme displayed high affinity and catalytic efficiency for casein under standard assay conditions (Vmax = 279 U/mg/min, Km = 1.70 mg/mL) and was also compatible with commercial detergents. These results suggest that Prt1A protease could act as an efficient enzyme in various industrial applications.
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Affiliation(s)
| | | | - Mary Sanitha
- Department of Genetic Engineering, SRM University, Tamilnadu 603203, India
| | - Sellamuthu Iyappan
- Department of Genetic Engineering, SRM University, Tamilnadu 603203, India
| | - Wayne R Curtis
- Department of Chemical Engineering, The Pennsylvania State University, University Park, PA 16802, USA
| | - Mohandass Ramya
- Department of Genetic Engineering, SRM University, Tamilnadu 603203, India.
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Extremophilic Proteases: Developments of Their Special Functions, Potential Resources and Biotechnological Applications. BIOTECHNOLOGY OF EXTREMOPHILES: 2016. [DOI: 10.1007/978-3-319-13521-2_14] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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Metagenomics: Retrospect and Prospects in High Throughput Age. BIOTECHNOLOGY RESEARCH INTERNATIONAL 2015; 2015:121735. [PMID: 26664751 PMCID: PMC4664791 DOI: 10.1155/2015/121735] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 07/13/2015] [Accepted: 10/26/2015] [Indexed: 01/30/2023]
Abstract
In recent years, metagenomics has emerged as a powerful tool for mining of hidden microbial treasure in a culture independent manner. In the last two decades, metagenomics has been applied extensively to exploit concealed potential of microbial communities from almost all sorts of habitats. A brief historic progress made over the period is discussed in terms of origin of metagenomics to its current state and also the discovery of novel biological functions of commercial importance from metagenomes of diverse habitats. The present review also highlights the paradigm shift of metagenomics from basic study of community composition to insight into the microbial community dynamics for harnessing the full potential of uncultured microbes with more emphasis on the implication of breakthrough developments, namely, Next Generation Sequencing, advanced bioinformatics tools, and systems biology.
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Singh R, Chopra C, Gupta VK, Akhlaq B, Verma V, Rasool S. Purification and characterization of CHpro1, a thermotolerant, alkali-stable and oxidation-resisting protease of Chumathang hotspring. Sci Bull (Beijing) 2015. [DOI: 10.1007/s11434-015-0834-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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31
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Coughlan LM, Cotter PD, Hill C, Alvarez-Ordóñez A. Biotechnological applications of functional metagenomics in the food and pharmaceutical industries. Front Microbiol 2015; 6:672. [PMID: 26175729 PMCID: PMC4485178 DOI: 10.3389/fmicb.2015.00672] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2015] [Accepted: 06/19/2015] [Indexed: 12/31/2022] Open
Abstract
Microorganisms are found throughout nature, thriving in a vast range of environmental conditions. The majority of them are unculturable or difficult to culture by traditional methods. Metagenomics enables the study of all microorganisms, regardless of whether they can be cultured or not, through the analysis of genomic data obtained directly from an environmental sample, providing knowledge of the species present, and allowing the extraction of information regarding the functionality of microbial communities in their natural habitat. Function-based screenings, following the cloning and expression of metagenomic DNA in a heterologous host, can be applied to the discovery of novel proteins of industrial interest encoded by the genes of previously inaccessible microorganisms. Functional metagenomics has considerable potential in the food and pharmaceutical industries, where it can, for instance, aid (i) the identification of enzymes with desirable technological properties, capable of catalyzing novel reactions or replacing existing chemically synthesized catalysts which may be difficult or expensive to produce, and able to work under a wide range of environmental conditions encountered in food and pharmaceutical processing cycles including extreme conditions of temperature, pH, osmolarity, etc; (ii) the discovery of novel bioactives including antimicrobials active against microorganisms of concern both in food and medical settings; (iii) the investigation of industrial and societal issues such as antibiotic resistance development. This review article summarizes the state-of-the-art functional metagenomic methods available and discusses the potential of functional metagenomic approaches to mine as yet unexplored environments to discover novel genes with biotechnological application in the food and pharmaceutical industries.
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Affiliation(s)
| | - Paul D Cotter
- Teagasc Food Research Centre Cork, Ireland ; Alimentary Pharmabiotic Centre Cork, Ireland
| | - Colin Hill
- Alimentary Pharmabiotic Centre Cork, Ireland ; School of Microbiology, University College Cork Cork, Ireland
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Dellagnezze BM, de Sousa GV, Martins LL, Domingos DF, Limache EEG, de Vasconcellos SP, da Cruz GF, de Oliveira VM. Bioremediation potential of microorganisms derived from petroleum reservoirs. MARINE POLLUTION BULLETIN 2014; 89:191-200. [PMID: 25457810 DOI: 10.1016/j.marpolbul.2014.10.003] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2014] [Revised: 10/03/2014] [Accepted: 10/04/2014] [Indexed: 06/04/2023]
Abstract
Bacterial strains and metagenomic clones, both obtained from petroleum reservoirs, were evaluated for petroleum degradation abilities either individually or in pools using seawater microcosms for 21 days. Gas Chromatography-Flame Ionization Detector (GC-FID) and Gas Chromatography-Mass Spectrometry (GC-MS) analyses were carried out to evaluate crude oil degradation. The results showed that metagenomic clones 1A and 2B were able to biodegrade n-alkanes (C14 to C33) and isoprenoids (phytane and pristane), with rates ranging from 31% to 47%, respectively. The bacteria Dietzia maris CBMAI 705 and Micrococcus sp. CBMAI 636 showed higher rates reaching 99% after 21 days. The metagenomic clone pool biodegraded these compounds at rates ranging from 11% to 45%. Regarding aromatic compound biodegradation, metagenomic clones 2B and 10A were able to biodegrade up to 94% of phenanthrene and methylphenanthrenes (3-MP, 2-MP, 9-MP and 1-MP) with rates ranging from 55% to 70% after 21 days, while the bacteria Dietzia maris CBMAI 705 and Micrococcus sp. CBMAI 636 were able to biodegrade 63% and up to 99% of phenanthrene, respectively, and methylphenanthrenes (3-MP, 2-MP, 9-MP and 1-MP) with rates ranging from 23% to 99% after 21 days. In this work, isolated strains as well as metagenomic clones were capable of degrading several petroleum compounds, revealing an innovative strategy and a great potential for further biotechnological and bioremediation applications.
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Affiliation(s)
- Bruna Martins Dellagnezze
- Microbial Resources Division, Research Center for Chemistry, Biology and Agriculture (CPQBA), University of Campinas - UNICAMP, CEP 13148-218, Paulinia, Brazil
| | - Gabriel Vasconcelos de Sousa
- Laboratory of Engineering and Petroleum Exploration, Darcy Ribeiro North Fluminense State University - LENEP/UENF, POB 119562, 27910-970 Macaé, RJ, Brazil
| | - Laercio Lopes Martins
- Laboratory of Engineering and Petroleum Exploration, Darcy Ribeiro North Fluminense State University - LENEP/UENF, POB 119562, 27910-970 Macaé, RJ, Brazil
| | - Daniela Ferreira Domingos
- Microbial Resources Division, Research Center for Chemistry, Biology and Agriculture (CPQBA), University of Campinas - UNICAMP, CEP 13148-218, Paulinia, Brazil
| | - Elmer E G Limache
- Microbial Resources Division, Research Center for Chemistry, Biology and Agriculture (CPQBA), University of Campinas - UNICAMP, CEP 13148-218, Paulinia, Brazil
| | | | - Georgiana Feitosa da Cruz
- Laboratory of Engineering and Petroleum Exploration, Darcy Ribeiro North Fluminense State University - LENEP/UENF, POB 119562, 27910-970 Macaé, RJ, Brazil
| | - Valéria Maia de Oliveira
- Microbial Resources Division, Research Center for Chemistry, Biology and Agriculture (CPQBA), University of Campinas - UNICAMP, CEP 13148-218, Paulinia, Brazil.
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Abstract
Metagenomics deals with the isolation of genetic material directly recovered from environmental samples. Metagenomics as an approach has emerged over the past two decades to elucidate a host of microbial communities inhabiting a specific niche with the goal of understanding their genetic diversity, population structure, and ecological role played by them. A number of new and novel molecules with significant functionalities and applications have been identified through this approach. In fact, many investigators are engaged in this field to unlock the untapped genetic resources with funding from governments sector. The sustainable economic future of modern industrialized societies requires the development of novel molecules, enzymes, processes, products, and applications. Metagenomics can also be applied to solve practical challenges in the field of medicine, agriculture, sustainability, and ecology. Metagenomics promises to provide new molecules and novel enzymes with diverse functions and enhanced features compared to the enzymes from the culturable microorganisms. Besides the application of metagenomics for unlocking novel biocatalysts from nature, it also has found applications in fields as diverse as bioremediation, personalized medicine, xenobiotic metabolism, and so forth.
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Morris LS, Marchesi JR. Current functional metagenomic approaches only expand the existing protease sequence space, but does not presently add any novelty to it. Curr Microbiol 2014; 70:19-26. [PMID: 25141963 DOI: 10.1007/s00284-014-0677-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2014] [Accepted: 07/03/2014] [Indexed: 01/14/2023]
Abstract
Proteases are a fundamental function in many organisms and thus many ecosystems and yet they are rarely obtained in functional metagenomic screens. Here, we have isolated an active protease gene (M1-2; 613 amino acids) which resided in a 38.4 kb fosmid clone that showed a classical protease-positive phenotype. It was classified as a zinc-dependent metalloprotease, with the closest annotated sequence as a neutral protease from Collimonas fungivorans (62 % similarity and 72 % homology). Further characterisation showed that its optimum temperature and pH were 42 °C and 8.0, respectively. Activity was inhibited by EDTA, but inhibition started to be reversed by excess Zn(2+). A putative signal peptide was identified bioinformatically and this may be why this protease was successfully isolated using a functional metagenomic screen. Bioinformatic analysis shows that this does not represent a novel protease, but simply expands the current sequence space of known proteases.
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Affiliation(s)
- Laura S Morris
- School of Biosciences, Cardiff University, Museum Avenue, Cardiff, CF10 3AX, UK
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An S, Couteau C, Luo F, Neveu J, DuBow MS. Bacterial diversity of surface sand samples from the Gobi and Taklamaken deserts. MICROBIAL ECOLOGY 2013; 66:850-60. [PMID: 23963222 DOI: 10.1007/s00248-013-0276-2] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2012] [Accepted: 08/01/2013] [Indexed: 05/10/2023]
Abstract
Arid regions represent nearly 30 % of the Earth's terrestrial surface, but their microbial biodiversity is not yet well characterized. The surface sands of deserts, a subset of arid regions, are generally subjected to large temperature fluctuations plus high UV light exposure and are low in organic matter. We examined surface sand samples from the Taklamaken (China, three samples) and Gobi (Mongolia, two samples) deserts, using pyrosequencing of PCR-amplified 16S V1/V2 rDNA sequences from total extracted DNA in order to gain an assessment of the bacterial population diversity. In total, 4,088 OTUs (using ≥97 % sequence similarity levels), with Chao1 estimates varying from 1,172 to 2,425 OTUs per sample, were discernable. These could be grouped into 102 families belonging to 15 phyla, with OTUs belonging to the Firmicutes, Proteobacteria, Bacteroidetes, and Actinobacteria phyla being the most abundant. The bacterial population composition was statistically different among the samples, though members from 30 genera were found to be common among the five samples. An increase in phylotype numbers with increasing C/N ratio was noted, suggesting a possible role in the bacterial richness of these desert sand environments. Our results imply an unexpectedly large bacterial diversity residing in the harsh environment of these two Asian deserts, worthy of further investigation.
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Affiliation(s)
- Shu An
- Univ. Paris-Sud, Laboratoire de Génomique et Biodiversité Microbienne des Biofilms (LGBMB), Institut de Génétique et Microbiologie, CNRS UMR 8621, Bâtiment 409, 91405, Orsay, France
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Lee MH, Lee SW. Bioprospecting potential of the soil metagenome: novel enzymes and bioactivities. Genomics Inform 2013; 11:114-20. [PMID: 24124406 PMCID: PMC3794083 DOI: 10.5808/gi.2013.11.3.114] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2013] [Revised: 08/14/2013] [Accepted: 08/20/2013] [Indexed: 11/22/2022] Open
Abstract
The microbial diversity in soil ecosystems is higher than in any other microbial ecosystem. The majority of soil microorganisms has not been characterized, because the dominant members have not been readily culturable on standard cultivation media; therefore, the soil ecosystem is a great reservoir for the discovery of novel microbial enzymes and bioactivities. The soil metagenome, the collective microbial genome, could be cloned and sequenced directly from soils to search for novel microbial resources. This review summarizes the microbial diversity in soils and the efforts to search for microbial resources from the soil metagenome, with more emphasis on the potential of bioprospecting metagenomics and recent discoveries.
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Affiliation(s)
- Myung Hwan Lee
- Department of Applied Biology, Dong-A University, Busan 604-714, Korea
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Biver S, Portetelle D, Vandenbol M. Characterization of a new oxidant-stable serine protease isolated by functional metagenomics. SPRINGERPLUS 2013; 2:410. [PMID: 24024096 PMCID: PMC3765597 DOI: 10.1186/2193-1801-2-410] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/29/2013] [Accepted: 08/26/2013] [Indexed: 11/10/2022]
Abstract
A novel serine protease gene, SBcas3.3, was identified by functional screening of a forest-soil metagenomic library on agar plates supplemented with AZCL-casein. Overproduction in Escherichia coli revealed that the enzyme is produced as a 770-amino-acid precursor which is processed to a mature protease of ~55 kDa. The latter was purified by affinity chromatography for characterization with the azocasein substrate. The enzyme proved to be an alkaline protease showing maximal activity between pH 9 and 10 and at 50°C. Treatment with the chelating agent ethylenediaminetetraacetic acid irreversibly denatured the protease, whose stability was found to depend strictly on calcium ions. The enzyme appeared relatively resistant to denaturing and reducing agents, and its activity was enhanced in the presence of 10 ml/l nonionic detergent (Tween 20, Tween 80, or Triton X-100). Moreover, SBcas3.3 displayed oxidant stability, a feature particularly sought in the detergent and bleaching industries. SBcas3.3 was activated by hydrogen peroxide at concentrations up to 10 g/l and it still retained 30% of activity in 50 g/l H2O2.
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Affiliation(s)
- Sophie Biver
- Unité de Microbiologie et Génomique, Gembloux Agro-Bio Tech, Université de Liège, Avenue Maréchal Juin 6, B-5030 Gembloux, Belgium
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Iqbal HA, Feng Z, Brady SF. Biocatalysts and small molecule products from metagenomic studies. Curr Opin Chem Biol 2012; 16:109-16. [PMID: 22455793 DOI: 10.1016/j.cbpa.2012.02.015] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2012] [Revised: 02/14/2012] [Accepted: 02/14/2012] [Indexed: 11/30/2022]
Abstract
The vast majority of bacteria present in environmental samples have never been cultured and therefore have not been exploited for the ability to produce useful biocatalysts or collections of biocatalysts generating interesting small molecules. Metagenomic libraries constructed using DNA extracted directly from natural bacterial communities offer access to the genetic information present in the genomes of these as yet uncultured bacteria. This review highlights recent efforts to recover both discrete enzymes and small molecules from metagenomic libraries.
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Affiliation(s)
- Hala A Iqbal
- Laboratory of Genetically Encoded Small Molecules, Howard Hughes Medical Institute, The Rockefeller University, 1230 York Avenue, New York, NY 10065, United States
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Kennedy J, O'Leary ND, Kiran GS, Morrissey JP, O'Gara F, Selvin J, Dobson ADW. Functional metagenomic strategies for the discovery of novel enzymes and biosurfactants with biotechnological applications from marine ecosystems. J Appl Microbiol 2011; 111:787-99. [PMID: 21777355 DOI: 10.1111/j.1365-2672.2011.05106.x] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Marine ecosystems are home to bacteria which are exposed to a wide variety of environmental conditions, such as extremes in temperature, salinity, nutrient availability and pressure. Survival under these conditions must have necessitated the adaptation and the development of unique cellular biochemistry and metabolism by these microbes. Thus, enzymes isolated from these microbes have the potential to possess quite unique physiological and biochemical properties. This review outlines a number of function-based metagenomic approaches which are available to screen metagenomic libraries constructed from marine ecosystems to facilitate the exploitation of some of these potentially novel biocatalysts. Functional screens to isolate novel cellulases, lipases and esterases, proteases, laccases, oxidoreductases and biosurfactants are described, together with approaches which can be employed to help overcome some of the typical problems encountered with functional metagenomic-based screens.
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Affiliation(s)
- J Kennedy
- Marine Biotechnology Centre, Environmental Research Institute, University College Cork, Cork, Ireland
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