201
|
Terán Hilares R, Ramos L, da Silva SS, Dragone G, Mussatto SI, Santos JCD. Hydrodynamic cavitation as a strategy to enhance the efficiency of lignocellulosic biomass pretreatment. Crit Rev Biotechnol 2017; 38:483-493. [PMID: 29233030 DOI: 10.1080/07388551.2017.1369932] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Hydrodynamic cavitation (HC) is a process technology with potential for application in different areas including environmental, food processing, and biofuels production. Although HC is an undesirable phenomenon for hydraulic equipment, the net energy released during this process is enough to accelerate certain chemical reactions. The application of cavitation energy to enhance the efficiency of lignocellulosic biomass pretreatment is an interesting strategy proposed for integration in biorefineries for the production of bio-based products. Moreover, the use of an HC-assisted process was demonstrated as an attractive alternative when compared to other conventional pretreatment technologies. This is not only due to high pretreatment efficiency resulting in high enzymatic digestibility of carbohydrate fraction, but also, by its high energy efficiency, simple configuration, and construction of systems, besides the possibility of using on the large scale. This paper gives an overview regarding HC technology and its potential for application on the pretreatment of lignocellulosic biomass. The parameters affecting this process and the perspectives for future developments in this area are also presented and discussed.
Collapse
Affiliation(s)
- Ruly Terán Hilares
- a Department of Biotechnology, Engineering School of Lorena , University of São Paulo , Lorena , Brazil
| | - Lucas Ramos
- a Department of Biotechnology, Engineering School of Lorena , University of São Paulo , Lorena , Brazil
| | - Silvio Silvério da Silva
- a Department of Biotechnology, Engineering School of Lorena , University of São Paulo , Lorena , Brazil
| | - Giuliano Dragone
- b National Food Institute , Technical University of Denmark , Kongens Lyngby , Denmark
| | - Solange I Mussatto
- c Novo Nordisk Foundation Center for Biosustainability , Technical University of Denmark , Kongens Lyngby , Denmark
| | - Júlio César Dos Santos
- a Department of Biotechnology, Engineering School of Lorena , University of São Paulo , Lorena , Brazil
| |
Collapse
|
202
|
Enhancing Cellulase and Hemicellulase Production in Trichoderma orientalis EU7-22 via Knockout of the creA. Mol Biotechnol 2017; 60:55-61. [DOI: 10.1007/s12033-017-0046-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
203
|
Parry NJ, Pieterse E, Weldon CW. Longevity, Fertility and Fecundity of Adult Blow Flies (Diptera: Calliphoridae) Held at Varying Densities: Implications for Use in Bioconversion of Waste. JOURNAL OF ECONOMIC ENTOMOLOGY 2017; 110:2388-2396. [PMID: 29040631 DOI: 10.1093/jee/tox251] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2017] [Indexed: 06/07/2023]
Abstract
Large numbers of flies are needed to produce the quantity of larvae required for insect bioconversion of waste. However, this 'mass-rearing' may negatively affect adult survival and reproductive output. This study assessed the suitability for mass-rearing of four blow fly species, Chrysomya chloropyga, Chrysomya chloropyga (Wiedemann), Chrysomya megacephala (F.), Chrysomya putoria (Wiedemann) and Lucilia sericata (Meigen). Flies were kept at densities of 20, 50, 100, 250, 500, and 1,000 flies per 30 × 30 × 30 cm cage with an even sex ratio. Time to 50% mortality (LT50) was recorded, and the effects of density, species, and sex on LT50, fecundity, and fertility were determined. Females survived longer than males across all species. There was evidence for a trade-off between survival and high fecundity in L. sericata and C. chloropyga at density 250. C. megacephala had low fecundity across all densities. At high densities, C. putoria had the lowest mortality and highest fecundity, making it the most suitable for mass-rearing.
Collapse
Affiliation(s)
| | - Elsje Pieterse
- Department of Animal Sciences, Stellenbosch University, South Africa
| | | |
Collapse
|
204
|
Gaikwad A. Interactions of mixing and reaction kinetics of depolymerization of cellulose to renewable fuels. CHEM ENG COMMUN 2017. [DOI: 10.1080/00986445.2017.1371015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Ashwin Gaikwad
- Department of Chemical Engineering, Visvesvaraya National Institute of Technology, Nagpur, India
| |
Collapse
|
205
|
Oh EJ, Kwak S, Kim H, Jin YS. Transporter engineering for cellobiose fermentation under lower pH conditions by engineered Saccharomyces cerevisiae. BIORESOURCE TECHNOLOGY 2017; 245:1469-1475. [PMID: 28583406 DOI: 10.1016/j.biortech.2017.05.138] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2017] [Revised: 05/19/2017] [Accepted: 05/21/2017] [Indexed: 06/07/2023]
Abstract
The aim of this study was to engineer cellodextrin transporter 2 (CDT-2) from Neurospora crassa for improved cellobiose fermentation under lower pH conditions by Saccharomyces cerevisiae. Through directed evolution, a mutant CDT-2 capable of facilitating cellobiose fermentation under lower pH conditions was obtained. Specifically, a library of CDT-2 mutants with GFP fusion was screened by flow cytometry and then serial subcultured to isolate a CDT-2 mutant capable of transporting cellobiose under acidic conditions. The engineered S. cerevisiae expressing the isolated mutant CDT-2 (I96N/T487A) produced ethanol with a specific cellobiose consumption rate of 0.069g/gcell/h, which was 51% and 55% higher than those of the strains harboring wild-type CDT-1 and CDT-2 in a minimal medium with 2g/L of acetic acid.
Collapse
Affiliation(s)
- Eun Joong Oh
- Department of Food Science and Human Nutrition, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA; Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Suryang Kwak
- Department of Food Science and Human Nutrition, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA; Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Heejin Kim
- Department of Food Science and Human Nutrition, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA; Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Yong-Su Jin
- Department of Food Science and Human Nutrition, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA; Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
| |
Collapse
|
206
|
Shibata N, Suetsugu M, Kakeshita H, Igarashi K, Hagihara H, Takimura Y. A novel GH10 xylanase from Penicillium sp. accelerates saccharification of alkaline-pretreated bagasse by an enzyme from recombinant Trichoderma reesei expressing Aspergillus β-glucosidase. BIOTECHNOLOGY FOR BIOFUELS 2017; 10:278. [PMID: 29201142 PMCID: PMC5698967 DOI: 10.1186/s13068-017-0970-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2017] [Accepted: 11/14/2017] [Indexed: 05/31/2023]
Abstract
BACKGROUND Trichoderma reesei is considered a candidate fungal enzyme producer for the economic saccharification of cellulosic biomass. However, performance of the saccharifying enzymes produced by T. reesei is insufficient. Therefore, many attempts have been made to improve its performance by heterologous protein expression. In this study, to increase the conversion efficiency of alkaline-pretreated bagasse to sugars, we conducted screening of biomass-degrading enzymes that showed synergistic effects with enzyme preparations produced by recombinant T. reesei. RESULTS Penicillium sp. strain KSM-F532 produced the most effective enzyme to promote the saccharification of alkaline-pretreated bagasse. Biomass-degrading enzymes from strain KSM-F532 were fractionated and analyzed, and a xylanase, named PspXyn10, was identified. The amino acid sequence of PspXyn10 was determined by cDNA analysis: the enzyme shows a modular structure consisting of glycoside hydrolase family 10 (GH10) and carbohydrate-binding module family 1 (CBM1) domains. Purified PspXyn10 was prepared from the supernatant of a recombinant T. reesei strain. The molecular weight of PspXyn10 was estimated to be 55 kDa, and its optimal temperature and pH for xylanase activity were 75 °C and pH 4.5, respectively. More than 80% of the xylanase activity was maintained at 65 °C for 10 min. With beechwood xylan as the substrate, the enzyme had a Km of 2.2 mg/mL and a Vmax of 332 μmol/min/mg. PspXyn10ΔCBM, which lacked the CBM1 domain, was prepared by limited proteolysis. PspXyn10ΔCBM showed increased activity against soluble xylan, but decreased saccharification efficiency of alkaline-pretreated bagasse. This result indicated that the CBM1 domain of PspXyn10 contributes to the enhancement of the saccharification efficiency of alkaline-pretreated bagasse. A recombinant T. reesei strain, named X2PX10, was constructed from strain X3AB1. X3AB1 is an Aspergillus aculeatus β-glucosidase-expressing T. reesei PC-3-7. X2PX10 also expressed PspXyn10 under the control of the xyn2 promoter. An enzyme preparation from X2PX10 showed almost the same saccharification efficiency of alkaline-pretreated bagasse at half the enzyme dosage as that used for an enzyme preparation from X3AB1. CONCLUSIONS Our results suggest that PspXyn10 promotes the saccharification of alkaline-pretreated bagasse more efficiently than TrXyn3, a GH10 family xylanase from T. reesei, and that the PspXyn10-expressing strain is suitable for enzyme production for biomass saccharification.
Collapse
Affiliation(s)
- Nozomu Shibata
- Biological Science Research, Kao Corporation, 1334 Minato, Wakayama, Wakayama 640-8580 Japan
| | - Mari Suetsugu
- Biological Science Research, Kao Corporation, 1334 Minato, Wakayama, Wakayama 640-8580 Japan
| | - Hiroshi Kakeshita
- Biological Science Research, Kao Corporation, 1334 Minato, Wakayama, Wakayama 640-8580 Japan
| | - Kazuaki Igarashi
- Biological Science Research, Kao Corporation, 1334 Minato, Wakayama, Wakayama 640-8580 Japan
| | - Hiroshi Hagihara
- Biological Science Research, Kao Corporation, 1334 Minato, Wakayama, Wakayama 640-8580 Japan
| | - Yasushi Takimura
- Biological Science Research, Kao Corporation, 1334 Minato, Wakayama, Wakayama 640-8580 Japan
| |
Collapse
|
207
|
Kanokratana P, Wongwilaiwalin S, Mhuantong W, Tangphatsornruang S, Eurwilaichitr L, Champreda V. Characterization of cellulolytic microbial consortium enriched on Napier grass using metagenomic approaches. J Biosci Bioeng 2017; 125:439-447. [PMID: 29169786 DOI: 10.1016/j.jbiosc.2017.10.014] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2017] [Revised: 09/11/2017] [Accepted: 10/25/2017] [Indexed: 11/17/2022]
Abstract
Energy grass is a promising substrate for production of biogas by anaerobic digestion. However, the conversion efficiency is limited by the enzymatically recalcitrant nature of cellulosic wastes. In this study, an active, structurally stable mesophilic lignocellulolytic degrading microbial consortium (Np-LMC) was constructed from forest compost soil microbiota by successive subcultivation on Napier grass under facultative anoxic conditions. According to tagged 16S rRNA gene amplicon sequencing, increasing abundance of facultative Proteobacteria was found in the middle of batch cycle which was then subsequently replaced by the cellulose degraders Firmicutes and Bacteroidetes along with decreasing CMCase, xylanase, and β-glucanase activity profiles in the supernatant after 5 days of incubation. Anaerobic/facultative bacteria Dysgonomonas and Sedimentibacter and aerobic bacteria Comamonas were the major genera found in Np-LMC. The consortium was active on degradation of the native and delignified grass. Direct shotgun sequencing of the consortium metagenome revealed relatively high abundance of genes encoding for various lignocellulose degrading enzymes in 23 glycosyl hydrolase (GH) families compared to previously reported cellulolytic microbial communities in mammalian digestive tracts. Enzymes attacking cellulose and hemicellulose were dominated by GH2, 3, 5, 9, 10, 26, 28 and 43 in addition to a variety of carbohydrate esterases (CE) and auxiliary activities (AA), reflecting adaptation of the enzyme systems to the native herbaceous substrate. The consortium identified here represents the microcosm specifically bred on energy grass, with potential for enhancing degradation of fibrous substrates in bioenergy industry.
Collapse
Affiliation(s)
- Pattanop Kanokratana
- Enzyme Technology Laboratory, National Center for Genetic Engineering and Biotechnology, 113 Thailand Science Park, Pahonyothin Road, Klong Luang, Pathum Thani 12120, Thailand.
| | - Sarunyou Wongwilaiwalin
- Enzyme Technology Laboratory, National Center for Genetic Engineering and Biotechnology, 113 Thailand Science Park, Pahonyothin Road, Klong Luang, Pathum Thani 12120, Thailand
| | - Wuttichai Mhuantong
- Enzyme Technology Laboratory, National Center for Genetic Engineering and Biotechnology, 113 Thailand Science Park, Pahonyothin Road, Klong Luang, Pathum Thani 12120, Thailand
| | - Sithichoke Tangphatsornruang
- Genomic Research Laboratory, National Center for Genetic Engineering and Biotechnology, 113 Thailand Science Park, Pahonyothin Road, Klong Luang, Pathum Thani 12120, Thailand
| | - Lily Eurwilaichitr
- Enzyme Technology Laboratory, National Center for Genetic Engineering and Biotechnology, 113 Thailand Science Park, Pahonyothin Road, Klong Luang, Pathum Thani 12120, Thailand
| | - Verawat Champreda
- Enzyme Technology Laboratory, National Center for Genetic Engineering and Biotechnology, 113 Thailand Science Park, Pahonyothin Road, Klong Luang, Pathum Thani 12120, Thailand
| |
Collapse
|
208
|
Comparison of One-Stage Batch and Fed-Batch Enzymatic Hydrolysis of Pretreated Hardwood for the Production of Biosugar. Appl Biochem Biotechnol 2017; 184:1441-1452. [PMID: 29064030 DOI: 10.1007/s12010-017-2633-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2017] [Accepted: 10/13/2017] [Indexed: 10/18/2022]
Abstract
Fed-batch method has shown a great promise in debottlenecking the high-solid enzymatic hydrolysis for the commercialization of cellulosic biosugar conversion for biofuel/biochemical production. To further improve enzymatic hydrolysis efficiency at high solid loading, fed-batch methods of green liquor-pretreated hardwood were performed to evaluate their effects on sugar recovery by comparing with one-stage batch method in this study. Among all the explored conditions, the fed-batch at 15% consistency gave higher sugar recovery on green liquor-pretreated hardwood compared to that of one-stage batch. By using general linear model analysis, the percentage of enzymatic sugar recovery in fed-batch consistency method (increasing consistency from the initial 10.7 to 15% at intervals of 24 and 48 h) was higher than that of batch hydrolysis at higher density of 15% consistency. Under that best fed-batch condition, the total sugar recovery of pretreated hardwood in enzymatic hydrolysate reached approximately 48.41% at Cellic® enzyme loading of 5 filter-paper unit (FPU)/g and 58.83% at Cellic® enzyme loading of 10 FPU/g with a hydrolysis time of 96 h.
Collapse
|
209
|
Medina-Morales MA, López-Trujillo J, Gómez-Narváez L, Mellado M, García-Martínez E, Ascacio-Valdés JA, Aguilar CN, Aguilera-Carbó A. Effect of growth conditions on β-glucosidase production using Flourensia cernua leaves in a solid-state fungal bioprocess. 3 Biotech 2017; 7:355. [PMID: 29062676 DOI: 10.1007/s13205-017-0990-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2017] [Accepted: 09/21/2017] [Indexed: 01/03/2023] Open
Abstract
Flourensia cernua foliage was used in a solid-state fungal bioprocess to identify factors that could affect β-glucosidase production such as growth medium components and partial identification of molecules from the plant material. Under an exploratory experimental design, each variable had their distinctive result on conditions, which affects and could further improve β-glucosidase production. Under the experimental design, 1482 U/L of β-glucosidase were detected, which marks an improvement in production compared to levels obtained in a control treatment with an activity of 1092 U/L. It was shown that inoculum, water content and pH were the factors with the greater effect on β-glucosidase production. Polyphenolic content and cellulosic fiber in the form of raw fiber were measured to assess compound degradation of the plant material. Although fiber content was apparently unaffected, polyphenolic content decreased; β-glucosidase was produced by A. niger GH1. This behavior could be associated with fiber level and polyphenolic content because molecules of this type can be hydrolyzed by β-glucosidase. According to our results, F. cernua biomass can be used as a carbon source for β-glucosidase production in a short culture time.
Collapse
Affiliation(s)
- Miguel A Medina-Morales
- Department of Animal Nutrition, Antonio Narro Agrarian Autonomous University, Calzada Antonio Narro 1923, Buenavista, 25315 Saltillo, Coahuila Mexico
| | - J López-Trujillo
- Department of Animal Nutrition, Antonio Narro Agrarian Autonomous University, Calzada Antonio Narro 1923, Buenavista, 25315 Saltillo, Coahuila Mexico
| | - L Gómez-Narváez
- Department of Animal Nutrition, Antonio Narro Agrarian Autonomous University, Calzada Antonio Narro 1923, Buenavista, 25315 Saltillo, Coahuila Mexico
| | - Miguel Mellado
- Department of Animal Nutrition, Antonio Narro Agrarian Autonomous University, Calzada Antonio Narro 1923, Buenavista, 25315 Saltillo, Coahuila Mexico
| | - E García-Martínez
- Department of Animal Nutrition, Antonio Narro Agrarian Autonomous University, Calzada Antonio Narro 1923, Buenavista, 25315 Saltillo, Coahuila Mexico
| | - Juan A Ascacio-Valdés
- Food Research Department, School of Chemistry, Autonomous University of Coahuila, Saltillo, Coahuila Mexico
| | - Cristóbal N Aguilar
- Food Research Department, School of Chemistry, Autonomous University of Coahuila, Saltillo, Coahuila Mexico
| | - Antonio Aguilera-Carbó
- Department of Animal Nutrition, Antonio Narro Agrarian Autonomous University, Calzada Antonio Narro 1923, Buenavista, 25315 Saltillo, Coahuila Mexico
| |
Collapse
|
210
|
Setter-Lamed E, Moraïs S, Stern J, Lamed R, Bayer EA. Modular Organization of the Thermobifida fusca Exoglucanase Cel6B Impacts Cellulose Hydrolysis and Designer Cellulosome Efficiency. Biotechnol J 2017; 12. [PMID: 28901714 DOI: 10.1002/biot.201700205] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2017] [Revised: 09/06/2017] [Indexed: 11/09/2022]
Abstract
Cellulose deconstruction can be achieved by three distinct enzymatic paradigms: free enzymes, multifunctional enzymes, and self-assembled, multi-enzyme complexes (cellulosomes). To study their comparative efficiency, the simple and efficient cellulolytic system of the aerobic bacterium, Thermobifida fusca, is developed as an enzymatic model. In previous studies, most of its cellulases are successfully converted to the cellulosomal mode and exhibited high cellulolytic activities, except for Cel6B, a key exoglucanase of the T. fusca enzymatic system. Here, the impact of the modular organization of Cel6B on enzymatic activity is investigated. The position of the cellulose-binding module (CBM), its family and linker segment are shown to affect activity. Surprisingly, exchange of the native family-2 CBM to family-3 generates an increase in Cel6B activity on cellulosic substrates. Conversion of Cel6B to the cellulosomal mode by fusing a cohesin to the catalytic module enables formation of divalent enzyme complexes with dockerin-bearing enzymes. The resultant pseudo-cellulosomes, containing Cel6B combined with endoglucanase Cel5A, exhibits enhanced enzymatic activity, compared to mixtures of wild-type enzymes or bifunctional enzymes, unlike similar pseudo-cellulosomes containing endoglucanase Cel6A or proccessive endoglucanase Cel9A. Insight into the different enzymatic paradigms benefits ongoing development of efficient cellulolytic systems for conversion of plant-derived biomass into valuable sugars. NOVELTY STATEMENT The protein engineering of the modular arrangement of a key exoglucanase from a highly cellulolytic bacterium, Thermobifida fusca, served to explore and compare three major enzymatic paradigms for cellulose degradation. This approach revealed highly active chimaeric forms of the exoglucanase that act in synergy together with a potent endoglucanase in bifunctional enzymes or divalent pseudo-cellulosome-like complexes. Such engineered enzymes could be further integrated into larger enzymatic complexes, thereby providing a significant step forward towards conversion of the entire T. fusca free cellulolytic system into the cellulosomal modex and the enhanced conversion of cellulosic biomass into soluble sugars.
Collapse
Affiliation(s)
- Eva Setter-Lamed
- Department of Biomolecular Sciences, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Sarah Moraïs
- Department of Biomolecular Sciences, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Johanna Stern
- Department of Biomolecular Sciences, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Raphael Lamed
- Department of Molecular Microbiology and Biotechnology, Tel Aviv University, Ramat Aviv, Israel
| | - Edward A Bayer
- Department of Biomolecular Sciences, The Weizmann Institute of Science, Rehovot 76100, Israel
| |
Collapse
|
211
|
Pradhan S, Borah AJ, Poddar MK, Dikshit PK, Rohidas L, Moholkar VS. Microbial production, ultrasound-assisted extraction and characterization of biopolymer polyhydroxybutyrate (PHB) from terrestrial (P. hysterophorus) and aquatic (E. crassipes) invasive weeds. BIORESOURCE TECHNOLOGY 2017; 242:304-310. [PMID: 28366692 DOI: 10.1016/j.biortech.2017.03.117] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Revised: 03/18/2017] [Accepted: 03/20/2017] [Indexed: 06/07/2023]
Abstract
This study reports synthesis of biodegradable poly(3-hydroxybutyrate) (PHB) polymer from two invasive weeds, viz. P. hysterophorus and E. crassipes. The pentose and hexose-rich hydrolyzates obtained from acid pretreatment and enzymatic hydrolysis of two biomasses were separately fermented using Ralstonia eutropha MTCC 8320 sp. PHB was extracted using sonication and was characterized using FTIR, 1H and 13C NMR and XRD. PHB content of dry cell mass was 8.1-21.6% w/w, and the PHB yield was 6.85×10-3-36.41×10-3% w/w raw biomass. Thermal properties of PHB were determined by TGA, DTG and DSC analysis. PHB obtained from pentose-hydrolyzate had glass transition temperatures of 6°-9°C, while PHB from hexose-rich hydrolyzate had maximum thermal degradation temperatures of 370°-389°C. These thermal properties were comparable to the properties of commercial PHB. Probable causes leading to differences in thermal properties of pentose and hexose-derived PHB are: extent of crystallinity and presence of impurity in the polymer matrix.
Collapse
Affiliation(s)
- Sushobhan Pradhan
- Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati 781 039, Assam, India
| | - Arup Jyoti Borah
- Center for Energy, Indian Institute of Technology Guwahati, Guwahati 781 039, Assam, India
| | - Maneesh Kumar Poddar
- Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati 781 039, Assam, India
| | - Pritam Kumar Dikshit
- Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati 781 039, Assam, India
| | - Lilendar Rohidas
- Department of Chemical Engineering, National Institute of Technology (NIT), Tiruchirappalli 620 015, Tamil Nadu, India
| | - Vijayanand S Moholkar
- Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati 781 039, Assam, India; Center for Energy, Indian Institute of Technology Guwahati, Guwahati 781 039, Assam, India.
| |
Collapse
|
212
|
Zhang J, Yuan J, Zhang WX, Zhu WY, Tu F, Jiang Y, Sun CZ. An aerobic detoxification photofermentation by Rhodospirillum rubrum for converting soy sauce residue into feed with moderate pretreatment. World J Microbiol Biotechnol 2017; 33:184. [DOI: 10.1007/s11274-017-2344-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2017] [Accepted: 09/16/2017] [Indexed: 10/18/2022]
|
213
|
Effect of organosolv pretreatment on mechanically pretreated biomass by use of concentrated ethanol as the solvent. BIOTECHNOL BIOPROC E 2017. [DOI: 10.1007/s12257-017-0088-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
214
|
Song HT, Yang YM, Liu DK, Xu XQ, Xiao WJ, Liu ZL, Xia WC, Wang CY, Yu X, Jiang ZB. Construction of recombinant Yarrowia lipolytica and its application in bio-transformation of lignocellulose. Bioengineered 2017; 8:624-629. [PMID: 28282268 PMCID: PMC5639843 DOI: 10.1080/21655979.2017.1293219] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2017] [Revised: 02/04/2017] [Accepted: 02/06/2017] [Indexed: 10/20/2022] Open
Abstract
Lignocellulose is a polysaccharide and an abundant biomass resource that widely exists in grains, beans, rice, and their by-products. Over 10 million tons of lignocellulose resources and processing products are produced every year in China. Three recombinant Y. lipolytica strains with cellulase (β-glucosidase, endoglucanase and cellobiohydrolase) were constructed. The enzymatic activities of these enzymes were 14.181 U/mL, 16.307 U/mL, and 17.391 U/mL, respectively. The whole cell cellulases were used for a stover bio-transformation. The celluloses in the stover were partly degraded by the cellulases, and the degradation products were transformed into single cell protein (SCP) by the Y. lipolytica cells. After 15 d of fermentation with the whole cell cellulases, the protein content of the maize stover and the rice straw reached 16.23% and 14.75%, which increased by 168.26% and 161.52% compared with the control, respectively. This study provides a new stage for the efficient utilization of stover in the feed industry.
Collapse
Affiliation(s)
- Hui-Ting Song
- Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, Hubei University, Wuhan, China
- College of Resources and Environmental Science, Hubei University, Wuhan, China
| | - Yi-Min Yang
- Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, Hubei University, Wuhan, China
| | - Ding-kang Liu
- Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, Hubei University, Wuhan, China
| | - Xiao-Qing Xu
- Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, Hubei University, Wuhan, China
| | - Wen-Jing Xiao
- Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, Hubei University, Wuhan, China
| | - Zi-Lu Liu
- Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, Hubei University, Wuhan, China
| | - Wu-Cheng Xia
- Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, Hubei University, Wuhan, China
| | - Chao-Ying Wang
- Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, Hubei University, Wuhan, China
| | - Xiao Yu
- Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, Hubei University, Wuhan, China
- College of Resources and Environmental Science, Hubei University, Wuhan, China
| | - Zheng-Bing Jiang
- Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, Hubei University, Wuhan, China
- Hubei Key Laboratory of Industrial Biotechnology, College of Life Science, Hubei University, Wuhan, China
| |
Collapse
|
215
|
Damage to the microbial cell membrane during pyrolytic sugar utilization and strategies for increasing resistance. ACTA ACUST UNITED AC 2017; 44:1279-1292. [DOI: 10.1007/s10295-017-1958-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2017] [Accepted: 05/20/2017] [Indexed: 11/25/2022]
Abstract
Abstract
Lignocellulosic biomass is an appealing feedstock for the production of biorenewable fuels and chemicals, and thermochemical processing is a promising method for depolymerizing it into sugars. However, trace compounds in this pyrolytic sugar syrup are inhibitory to microbial biocatalysts. This study demonstrates that hydrophobic inhibitors damage the cell membrane of ethanologenic Escherichia coli KO11+lgk. Adaptive evolution was employed to identify design strategies for improving pyrolytic sugar tolerance and utilization. Characterization of the resulting evolved strain indicates that increased resistance to the membrane-damaging effects of the pyrolytic sugars can be attributed to a glutamine to leucine mutation at position 29 of carbon storage regulator CsrA. This single amino acid change is sufficient for decreasing EPS protein production and increasing membrane integrity when exposed to pyrolytic sugars.
Collapse
|
216
|
Ali SS, Abomohra AEF, Sun J. Effective bio-pretreatment of sawdust waste with a novel microbial consortium for enhanced biomethanation. BIORESOURCE TECHNOLOGY 2017; 238:425-432. [PMID: 28458176 DOI: 10.1016/j.biortech.2017.03.187] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2017] [Revised: 03/28/2017] [Accepted: 03/30/2017] [Indexed: 05/25/2023]
Abstract
Anaerobic digestion (AD) is considered an efficient cost-effective technology for sustainable biogas production from lignocellulosic wastes. A novel lignocellulosic degradation microbial consortium (LCDC) was isolated from rotten sawdust, and further used for sawdust pretreatment prior to AD. Results showed that pretreatment of sawdust for 10days led to significant reduction in cellulose, hemicelluloses, and lignin contents by 37.5%, 39.6%, and 56.7%, respectively, with respect to the control. In addition, the pretreatment enhanced cumulative biogas yield, which reached its maximum value of 312.0Lkg-1VS after 28days of AD (25.6% higher than the corresponding control). Moreover, the maximum significant cumulative methane yield was recorded after 28days of AD of the pretreated sawdust (155.2Lkg-1VS), which represented 72.6% higher than the corresponding control. Significantly higher biomethane yield from sawdust pretreated with LCDC confirms that this process is more economical than the previous reports.
Collapse
Affiliation(s)
- Sameh S Ali
- Biofuels Institute, School of the Environment and Safety Engineering, Jiangsu University, 212013 Zhenjiang, China; Botany Department, Faculty of Science, Tanta University, 31527 Tanta, Egypt
| | - Abd El-Fatah Abomohra
- School of Energy and Power Engineering, Jiangsu University, 212013 Zhenjiang, China; Botany Department, Faculty of Science, Tanta University, 31527 Tanta, Egypt
| | - Jianzhong Sun
- Biofuels Institute, School of the Environment and Safety Engineering, Jiangsu University, 212013 Zhenjiang, China.
| |
Collapse
|
217
|
Wang W, Wang Q, Tan X, Qi W, Yu Q, Zhuang X, Yuan Z. The Ways of Factors Influencing High-Solid Enzymatic Hydrolysis of Sugarcane Bagasse Treated by Liquid Hot Water. ChemistrySelect 2017. [DOI: 10.1002/slct.201701353] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Wen Wang
- Guangzhou Institute of Energy Conversion; Chinese Academy of Sciences; CAS Key Laboratory of Renewable Energy; Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development; No. 2 Nengyuan Road, Wushan, Tianhe District Guangzhou 510640 China
| | - Qiong Wang
- Guangzhou Institute of Energy Conversion; Chinese Academy of Sciences; CAS Key Laboratory of Renewable Energy; Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development; No. 2 Nengyuan Road, Wushan, Tianhe District Guangzhou 510640 China
| | - Xuesong Tan
- Guangzhou Institute of Energy Conversion; Chinese Academy of Sciences; CAS Key Laboratory of Renewable Energy; Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development; No. 2 Nengyuan Road, Wushan, Tianhe District Guangzhou 510640 China
| | - Wei Qi
- Guangzhou Institute of Energy Conversion; Chinese Academy of Sciences; CAS Key Laboratory of Renewable Energy; Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development; No. 2 Nengyuan Road, Wushan, Tianhe District Guangzhou 510640 China
| | - Qiang Yu
- Guangzhou Institute of Energy Conversion; Chinese Academy of Sciences; CAS Key Laboratory of Renewable Energy; Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development; No. 2 Nengyuan Road, Wushan, Tianhe District Guangzhou 510640 China
| | - Xinshu Zhuang
- Guangzhou Institute of Energy Conversion; Chinese Academy of Sciences; CAS Key Laboratory of Renewable Energy; Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development; No. 2 Nengyuan Road, Wushan, Tianhe District Guangzhou 510640 China
| | - Zhenhong Yuan
- Guangzhou Institute of Energy Conversion; Chinese Academy of Sciences; CAS Key Laboratory of Renewable Energy; Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development; No. 2 Nengyuan Road, Wushan, Tianhe District Guangzhou 510640 China
- Collaborative Innovation Center of Biomass Energy; No. 63 Agricultural Road, Jinshui District Zhengzhou 450002 China
| |
Collapse
|
218
|
da Silva VM, Sato JAP, Araujo JN, Squina FM, Muniz JRC, Riske KA, Garcia W. Systematic studies of the interactions between a model polyphenol compound and microbial β-glucosidases. PLoS One 2017; 12:e0181629. [PMID: 28727856 PMCID: PMC5519169 DOI: 10.1371/journal.pone.0181629] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Accepted: 07/04/2017] [Indexed: 01/22/2023] Open
Abstract
Lignin is a major obstacle for cost-effective conversion of cellulose into fermentable sugars. Non-productive adsorption onto insoluble lignin fragments and interactions with soluble phenols are important inhibition mechanisms of cellulases, including β-glucosidases. Here, we examined the inhibitory effect of tannic acid (TAN), a model polyphenolic compound, on β-glucosidases from the bacterium Thermotoga petrophila (TpBGL1 and TpBGL3) and archaeon Pyrococcus furiosus (PfBGL1). The results revealed that the inhibition effects on β-glucosidases were TAN concentration-dependent. TpBGL1 and TpBGL3 were more tolerant to the presence of TAN when compared with PfBGL1, while TpBGL1 was less inhibited when compared with TpBGL3. In an attempt to better understand the inhibitory effect, the interaction between TAN and β-glucosidases were analyzed by isothermal titration calorimetry (ITC). Furthermore, the exposed hydrophobic surface areas in β-glucosidases were analyzed using a fluorescent probe and compared with the results of inhibition and ITC. The binding constants determined by ITC for the interactions between TAN and β-glucosidases presented the same order of magnitude. However, the number of binding sites and exposed hydrophobic surface areas varied for the β-glucosidases studied. The binding between TAN and β-glucosidases were driven by enthalpic effects and with an unfavorable negative change in entropy upon binding. Furthermore, the data suggest that there is a high correlation between exposed hydrophobic surface areas and the number of binding sites on the inhibition of microbial β-glucosidases by TAN. These studies can be useful for biotechnological applications.
Collapse
Affiliation(s)
- Viviam M. da Silva
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC (UFABC), Santo André, São Paulo, Brazil
| | - Juliana A. P. Sato
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC (UFABC), Santo André, São Paulo, Brazil
| | - Juscemácia N. Araujo
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC (UFABC), Santo André, São Paulo, Brazil
| | - Fabio M. Squina
- Programa de Processos Tecnológicos e Ambientais, Universidade de Sorocaba (UNISO), Sorocaba, São Paulo, Brazil
| | - João R. C. Muniz
- Instituto de Física de São Carlos (IFSC), Universidade de São Paulo (USP), São Carlos, São Paulo, Brazil
| | - Karin A. Riske
- Departamento de Biofísica, Universidade Federal de São Paulo, São Paulo, Brazil
| | - Wanius Garcia
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC (UFABC), Santo André, São Paulo, Brazil
- * E-mail:
| |
Collapse
|
219
|
Sepulchre JA, Mairet F, Gouzé JL. Optimization and control of bio-conversion of polymeric substrate in the chemostat. AIChE J 2017. [DOI: 10.1002/aic.15853] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
| | - Francis Mairet
- Université Côte d'Azur, INRIA, BIOCORE project team; Sophia Antipolis France
| | - Jean-Luc Gouzé
- Université Côte d'Azur, INRIA, BIOCORE project team; Sophia Antipolis France
| |
Collapse
|
220
|
Ali SS, Wu J, Xie R, Zhou F, Sun J, Huang M. Screening and characterizing of xylanolytic and xylose-fermenting yeasts isolated from the wood-feeding termite, Reticulitermes chinensis. PLoS One 2017; 12:e0181141. [PMID: 28704553 PMCID: PMC5509302 DOI: 10.1371/journal.pone.0181141] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2017] [Accepted: 06/21/2017] [Indexed: 11/20/2022] Open
Abstract
The effective fermentation of xylose remains an intractable challenge in bioethanol industry. The relevant xylanase enzyme is also in a high demand from industry for several biotechnological applications that inevitably in recent times led to many efforts for screening some novel microorganisms for better xylanase production and fermentation performance. Recently, it seems that wood-feeding termites can truly be considered as highly efficient natural bioreactors. The highly specialized gut systems of such insects are not yet fully realized, particularly, in xylose fermentation and xylanase production to advance industrial bioethanol technology as well as industrial applications of xylanases. A total of 92 strains from 18 yeast species were successfully isolated and identified from the gut of wood-feeding termite, Reticulitermes chinensis. Of these yeasts and strains, seven were identified for new species: Candida gotoi, Candida pseudorhagii, Hamamotoa lignophila, Meyerozyma guilliermondii, Sugiyamaella sp.1, Sugiyamaella sp. 2, and Sugiyamaella sp.3. Based on the phylogenetic and phenotypic characterization, the type strain of C. pseudorhagii sp. nov., which was originally designated strain SSA-1542T, was the most frequently occurred yeast from termite gut samples, showed the highly xylanolytic activity as well as D-xylose fermentation. The highest xylanase activity was recorded as 1.73 and 0.98 U/mL with xylan or D-xylose substrate, respectively, from SSA-1542T. Among xylanase-producing yeasts, four novel species were identified as D-xylose-fermenting yeasts, where the yeast, C. pseudorhagii SSA-1542T, showed the highest ethanol yield (0.31 g/g), ethanol productivity (0.31 g/L·h), and its fermentation efficiency (60.7%) in 48 h. Clearly, the symbiotic yeasts isolated from termite guts have demonstrated a competitive capability to produce xylanase and ferment xylose, suggesting that the wood-feeding termite gut is a promising reservoir for novel xylanases-producing and xylose-fermenting yeasts that are potentially valued for biorefinery industry.
Collapse
Affiliation(s)
- Sameh Samir Ali
- Biofuels Institute, School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang, China
- Botany Department, Faculty of Science, Tanta University, Tanta, Egypt
| | - Jian Wu
- Biofuels Institute, School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang, China
| | - Rongrong Xie
- Biofuels Institute, School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang, China
| | - Feng Zhou
- Biofuels Institute, School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang, China
| | - Jianzhong Sun
- Biofuels Institute, School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang, China
- * E-mail:
| | - Miao Huang
- Biofuels Institute, School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang, China
| |
Collapse
|
221
|
Cruz-Ramírez CA, Gómez-Ramírez LF, Uribe-Vélez D. Manejo biológico del tamo de arroz bajo diferentes relaciones C:N empleando co-inóculos microbianos y promotores de crecimiento vegetal. REVISTA COLOMBIANA DE BIOTECNOLOGÍA 2017. [DOI: 10.15446/rev.colomb.biote.v19n2.70168] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
El tamo de arroz es uno de los residuos agrícolas lignocelulósicos más abundantes en el planeta, luego de los residuos producidos por los cultivos de maíz y trigo, con una producción mundial estimada de 1000 millones de toneladas según estadísticas de la FAO. En el contexto de la agricultura moderna es determinante lograr un manejo ambientalmente sostenible de este recurso mediante su incorporación al suelo, de tal forma que se logre el reciclaje de nutrientes, evitando la incorporación de patógenos al sistema y la inmovilización de elementos como el nitrógeno por la comunidad microbiana. El objetivo de este trabajo consistió en la evaluación de un inoculo microbiano mixto a partir de productos comerciales basados en hongos del género Trichoderma y bacterias aerobias formadoras de endosporas, con potencial degradador del tamo de arroz, así como el empleo de bacterias promotoras de crecimiento vegetal al momento de la siembra, que pudieran aprovechar los nutrientes del proceso de descomposición del tamo de arroz, potenciando su actividad biológica. Los tratamientos fueron evaluados bajo diferentes relaciones C:N del tamo de arroz que favorecieran el proceso de degradación, mediante la adición de nitrógeno inorgánico. Los resultados del trabajo permitieron identificar que la aplicación de una enmienda de nitrógeno a una relación C:N 35 más una dosis adicional de urea al momento de la siembra de las semillas de arroz, fue el tratamiento más adecuado para potenciar el efecto de los microorganismos e incrementar las variables agronómicas obtenidas mediante un esquema de fertilización convencional del cultivo.
Collapse
|
222
|
Manavalan T, Liu R, Zhou Z, Zou G. Optimization of acetyl xylan esterase gene expression in Trichoderma reesei and its application to improve the saccharification efficiency on different biomasses. Process Biochem 2017. [DOI: 10.1016/j.procbio.2017.04.042] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
|
223
|
de Eugenio LI, Méndez-Líter JA, Nieto-Domínguez M, Alonso L, Gil-Muñoz J, Barriuso J, Prieto A, Martínez MJ. Differential β-glucosidase expression as a function of carbon source availability in Talaromyces amestolkiae: a genomic and proteomic approach. BIOTECHNOLOGY FOR BIOFUELS 2017; 10:161. [PMID: 28649280 PMCID: PMC5481877 DOI: 10.1186/s13068-017-0844-7] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2016] [Accepted: 06/08/2017] [Indexed: 05/07/2023]
Abstract
BACKGROUND Genomic and proteomic analysis are potent tools for metabolic characterization of microorganisms. Although cellulose usually triggers cellulase production in cellulolytic fungi, the secretion of the different enzymes involved in polymer conversion is subjected to different factors, depending on growth conditions. These enzymes are key factors in biomass exploitation for second generation bioethanol production. Although highly effective commercial cocktails are available, they are usually deficient for β-glucosidase activity, and genera like Penicillium and Talaromyces are being explored for its production. RESULTS This article presents the description of Talaromyces amestolkiae as a cellulase-producer fungus that secretes high levels of β-glucosidase. β-1,4-endoglucanase, exoglucanase, and β-glucosidase activities were quantified in the presence of different carbon sources. Although the two first activities were only induced with cellulosic substrates, β-glucosidase levels were similar in all carbon sources tested. Sequencing and analysis of the genome of this fungus revealed multiple genes encoding β-glucosidases. Extracellular proteome analysis showed different induction patterns. In all conditions assayed, glycosyl hydrolases were the most abundant proteins in the supernatants, albeit the ratio of the diverse enzymes from this family depended on the carbon source. At least two different β-glucosidases have been identified in this work: one is induced by cellulose and the other one is carbon source-independent. The crudes induced by Avicel and glucose were independently used as supplements for saccharification of slurry from acid-catalyzed steam-exploded wheat straw, obtaining the highest yields of fermentable glucose using crudes induced by cellulose. CONCLUSIONS The genome of T. amestolkiae contains several genes encoding β-glucosidases and the fungus secretes high levels of this activity, regardless of the carbon source availability, although its production is repressed by glucose. Two main different β-glucosidases have been identified from proteomic shotgun analysis. One of them is produced under different carbon sources, while the other is induced in cellulosic substrates and is a good supplement to Celluclast in saccharification of pretreated wheat straw.
Collapse
Affiliation(s)
- Laura I. de Eugenio
- Department of Environmental Biology, Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu 9, 28040 Madrid, Spain
| | - Juan A. Méndez-Líter
- Department of Environmental Biology, Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu 9, 28040 Madrid, Spain
| | - Manuel Nieto-Domínguez
- Department of Environmental Biology, Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu 9, 28040 Madrid, Spain
| | - Lola Alonso
- Department of Environmental Biology, Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu 9, 28040 Madrid, Spain
- Genetic and Molecular Epidemiology Group, Human Cancer Genetics Programme, Spanish National Cancer Research Centre, CNIO, Melchor Fernández Almagro 3, 28029 Madrid, Spain
| | - Jesús Gil-Muñoz
- Department of Environmental Biology, Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu 9, 28040 Madrid, Spain
| | - Jorge Barriuso
- Department of Environmental Biology, Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu 9, 28040 Madrid, Spain
| | - Alicia Prieto
- Department of Environmental Biology, Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu 9, 28040 Madrid, Spain
| | - María Jesús Martínez
- Department of Environmental Biology, Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu 9, 28040 Madrid, Spain
| |
Collapse
|
224
|
Yang R, Liu Y, Zhou Z, Sheng J, Meng D. Microelectric Current Treatment Enhanced Biodegradation of Pumpkin Lignocelluloses by Trichoderma reesei RUT-C30. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2017; 65:4668-4675. [PMID: 28537388 DOI: 10.1021/acs.jafc.7b00902] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
A homemade microcurrent reactor was used to treat the fermentation of Trichoderma reesei. Results indicated that the yield of saccharides for T. reesei RUT-C30 cultivated in pumpkin lignocellulose broth reaches 38.86% (w/w) when a microcurrent treatment (20 mA, at the 48th hour for 60 min) was carried out, which is significantly higher than the control group (p < 0.05). Additionally, activities of endoglucanase, cellobiohydrolase, xylanase, and pectinase were significantly increased in days 3-7. Furthermore, the fungal growth was facilitated by microelectric treatment, showing a 0.57-fold increase of spore numbers at the sixth day of cultivation. Besides, the monosaccharide composition, including glucose (1.03 mg/mL), xylose (0.12 mg/mL), arabinose (0.31 mg/mL), and fructose (0.13 mg/mL), extracted from the reactor was higher than that without the current treatment. In this work, we improved the biodegradation of lignocellulosic wastes by applying a microcurrent to lignocellulose-degrading fungal cultures and provided a new idea for the lignocellulose material pretreatment and bioconversion.
Collapse
Affiliation(s)
- Rui Yang
- Key Laboratory of Food Nutrition and Safety, Ministry of Education, Tianjin University of Science and Technology , Tianjin 300457, People's Republic of China
- Tianjin Food Safety & Low Carbon Manufacturing Collaborative Innovation Center , Tianjin 300457, People's Republic of China
| | - Yuqian Liu
- Key Laboratory of Food Nutrition and Safety, Ministry of Education, Tianjin University of Science and Technology , Tianjin 300457, People's Republic of China
| | - Zhongkai Zhou
- Key Laboratory of Food Nutrition and Safety, Ministry of Education, Tianjin University of Science and Technology , Tianjin 300457, People's Republic of China
- Tianjin Food Safety & Low Carbon Manufacturing Collaborative Innovation Center , Tianjin 300457, People's Republic of China
| | - Jiping Sheng
- School of Agricultural Economics and Rural Development, Renmin University of China , Beijing 100872, People's Republic of China
| | - Demei Meng
- Key Laboratory of Food Nutrition and Safety, Ministry of Education, Tianjin University of Science and Technology , Tianjin 300457, People's Republic of China
| |
Collapse
|
225
|
Arevalo-Gallegos A, Ahmad Z, Asgher M, Parra-Saldivar R, Iqbal HMN. Lignocellulose: A sustainable material to produce value-added products with a zero waste approach-A review. Int J Biol Macromol 2017; 99:308-318. [PMID: 28254573 DOI: 10.1016/j.ijbiomac.2017.02.097] [Citation(s) in RCA: 147] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2016] [Revised: 02/21/2017] [Accepted: 02/27/2017] [Indexed: 02/08/2023]
Abstract
A novel facility from the green technologies to integrate biomass-based carbohydrates, lignin, oils and other materials extraction and transformation into a wider spectrum of marketable and value-added products with a zero waste approach is reviewed. With ever-increasing scientific knowledge, worldwide economic and environmental consciousness, demands of legislative authorities and the manufacture, use, and removal of petrochemical-based by-products, from the last decade, there has been increasing research interests in the value or revalue of lignocellulose-based materials. The potential characteristics like natural abundance, renewability, recyclability, and ease of accessibility all around the year, around the globe, all makes residual biomass as an eco-attractive and petro-alternative candidate. In this context, many significant research efforts have been taken into account to change/replace petroleum-based economy into a bio-based economy, with an aim to develop a comprehensively sustainable, socially acceptable, and eco-friendly society. The present review work mainly focuses on various aspects of bio-refinery as a sustainable technology to process lignocellulose 'materials' into value-added products. Innovations in the bio-refinery world are providing, a portfolio of sustainable and eco-efficient products to compete in the market presently dominated by the petroleum-based products, and therefore, it is currently a subject of intensive research.
Collapse
Affiliation(s)
- Alejandra Arevalo-Gallegos
- School of Engineering and Science, Tecnologico de Monterrey, Campus Monterrey, Ave. Eugenio Garza Sada 2501, Monterrey, N.L., CP 64849, Mexico
| | - Zanib Ahmad
- Industrial Biotechnology Laboratory, Department of Biochemistry, University of Agriculture, Faisalabad, Pakistan
| | - Muhammad Asgher
- Industrial Biotechnology Laboratory, Department of Biochemistry, University of Agriculture, Faisalabad, Pakistan
| | - Roberto Parra-Saldivar
- School of Engineering and Science, Tecnologico de Monterrey, Campus Monterrey, Ave. Eugenio Garza Sada 2501, Monterrey, N.L., CP 64849, Mexico
| | - Hafiz M N Iqbal
- School of Engineering and Science, Tecnologico de Monterrey, Campus Monterrey, Ave. Eugenio Garza Sada 2501, Monterrey, N.L., CP 64849, Mexico.
| |
Collapse
|
226
|
Growth and expression of relevant metabolic genes of Clostridium thermocellum cultured on lignocellulosic residues. ACTA ACUST UNITED AC 2017; 44:825-834. [DOI: 10.1007/s10295-017-1915-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2016] [Accepted: 01/29/2017] [Indexed: 12/31/2022]
Abstract
Abstract
The plant cell wall is a source of fermentable sugars in second-generation bioethanol production. However, cellulosic biomass hydrolysis remains an obstacle to bioethanol production in an efficient and low-cost process. Clostridium thermocellum has been studied as a model organism able to produce enzymatic blends that efficiently degrade lignocellulosic biomass, and also as a fermentative microorganism in a consolidated process for the conversion of lignocellulose to bioethanol. In this study, a C. thermocellum strain (designated B8) isolated from goat rumen was characterized for its ability to grow on sugarcane straw and cotton waste, and to produce cellulosomes. We also evaluated C. thermocellum gene expression control in the presence of complex lignocellulosic biomasses. This isolate is capable of growing in the presence of microcrystalline cellulose, sugarcane straw and cotton waste as carbon sources, producing free enzymes and residual substrate-bound proteins (RSBP). The highest growth rate and cellulase/xylanase production were detected at pH 7.0 and 60 °C, after 48 h. Moreover, this strain showed different expression levels of transcripts encoding cellulosomal proteins and proteins with a role in fermentation and catabolic repression.
Collapse
|
227
|
Palakawong Na Ayudthaya S, Hilderink LJ, Oost JVD, Vos WMD, Plugge CM. Streptococcus caviae sp. nov., isolated from guinea pig faecal samples. Int J Syst Evol Microbiol 2017; 67:1551-1556. [PMID: 28008820 DOI: 10.1099/ijsem.0.001758] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
A novel cellobiose-degrading and lactate-producing bacterium, strain Cavy grass 6T, was isolated from faecal samples of guinea pigs (Cavia porcellus). Cells of the strain were ovalshaped, non-motile, non-spore-forming, Gram-stain-positive and facultatively anaerobic. The strain gr at 25-40 °C (optimum 37 °C) and pH 4.5-9.5 (optimum 8.0). Phylogenetic analysis based on 16S rRNA gene sequences showed that strain Cavy grass 6T belongs to the genus Streptococcus with its closest relative being Streptococcus devriesei CCUG 47155T with only 96.5 % similarity. Comparing strain Cavy grass 6T and Streptococcus devriesei CCUG 47155T, average nucleotide identity and level of digital DNA-DNA hybridization dDDH were only 86.9 and 33.3 %, respectively. Housekeeping genes groEL and gyrA were different between strain Cavy grass 6T and other streptococci. The G+C content of strain Cavy grass 6T was 42.6±0.3 mol%. The major (>10 %) cellular fatty acids of strain Cavy grass 6T were C16:0, C20 : 1ω9c and summed feature 8 (C18 : 1ω7c and/or C18 : 1ω6c). Strain Cavy grass 6T ferment a range of plant mono- and disaccharides as well as polymeric carbohydrates, including cellobiose, dulcitol, d-glucose, maltose, raffinose, sucrose, l-sorbose, trehalose, inulin and dried grass extract, to lactate, formate, acetate and ethanol. Based on phylogenetic and physiological characteristics, Cavy grass 6T can be distinguished from other members of the genus Streptococcus. Therefore, a novel species of the genus Streptococcus, family Streptococcaceae, order Lactobacillales is proposed, Streptococcuscaviae sp. nov. (type strain Cavy grass 6T=TISTR 2371T=DSM 102819T).
Collapse
Affiliation(s)
| | - Loes J Hilderink
- Laboratory of Microbiology, Wageningen University, Stippeneng 4, 6708 WE, Wageningen, The Netherlands
| | - John van der Oost
- Laboratory of Microbiology, Wageningen University, Stippeneng 4, 6708 WE, Wageningen, The Netherlands
| | - Willem M de Vos
- Laboratory of Microbiology, Wageningen University, Stippeneng 4, 6708 WE, Wageningen, The Netherlands.,RPU Immunology, Department of Bacteriology and Immunology, University of Helsinki, Helsinki, Finland
| | - Caroline M Plugge
- Laboratory of Microbiology, Wageningen University, Stippeneng 4, 6708 WE, Wageningen, The Netherlands
| |
Collapse
|
228
|
Cai Y, Gong Y, Liu W, Hu Y, Chen L, Yan L, Zhou Y, Bian Y. Comparative secretomic analysis of lignocellulose degradation by Lentinula edodes grown on microcrystalline cellulose, lignosulfonate and glucose. J Proteomics 2017; 163:92-101. [PMID: 28483534 DOI: 10.1016/j.jprot.2017.04.023] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2017] [Revised: 04/13/2017] [Accepted: 04/26/2017] [Indexed: 11/18/2022]
Abstract
Lentinula edodes has the potential to degrade woody and nonwoody lignocellulosic biomass. However, the mechanism of lignocellulose degradation by L. edodes is unclear. The aim of this work is to explore the profiling of soluble secreted proteins involved in lignocellulose degradation in L. edodes. For that, we compared the secretomes of L. edodes grown on microcrystalline cellulose, cellulose with lignosulfonate and glucose. Based on nanoliquid chromatography coupled with tandem mass spectrometry of whole-protein hydrolysate, 230 proteins were identified. Label-free proteomic analysis showed that the most abundant carbohydrate-active enzymes involved in polysaccharide hydrolysis were endo-β-1,4-glucanase, α-galactosidase, polygalacturonase and glucoamylase in both cellulosic secretomes. In contrast, enzymes involved in lignin degradation were most abundant in glucose culture, with laccase 1 being the predominant protein (13.13%). When the cellulose and cellulose with lignosulfonate secretomes were compared, the abundance of cellulases and hemicellulases was higher in cellulose with lignosulfonate cultures, which was confirmed by enzyme activity assays. In addition, qRT-PCR analysis demonstrated that the expression levels of genes encoding cellulases and hemicellulases were significantly increased (by 32.2- to 1166.7-fold) when L. edodes was grown in cellulose with lignosulfonate medium. BIOLOGICAL SIGNIFICANCE In this article, the secretomes of L. edodes grown on three different carbon sources were compared. The presented results revealed the profiling of extracellular enzymes involved in lignocellulose degradation, which is helpful to further explore the mechanism of biomass bioconversion by L. edodes.
Collapse
Affiliation(s)
- Yingli Cai
- Institute of Applied Mycology, Plant Science and Technology College, Huazhong Agricultural University,Wuhan, Hubei, China; Key Laboratory of Agro-Microbial Resource Comprehensive Utilization, Ministry of Agriculture, Huazhong Agricultural University, Wuhan, Hubei, China
| | - Yuhua Gong
- Institute of Applied Mycology, Plant Science and Technology College, Huazhong Agricultural University,Wuhan, Hubei, China; Key Laboratory of Agro-Microbial Resource Comprehensive Utilization, Ministry of Agriculture, Huazhong Agricultural University, Wuhan, Hubei, China
| | - Wei Liu
- Institute of Applied Mycology, Plant Science and Technology College, Huazhong Agricultural University,Wuhan, Hubei, China; Key Laboratory of Agro-Microbial Resource Comprehensive Utilization, Ministry of Agriculture, Huazhong Agricultural University, Wuhan, Hubei, China
| | - Yue Hu
- Institute of Applied Mycology, Plant Science and Technology College, Huazhong Agricultural University,Wuhan, Hubei, China; Key Laboratory of Agro-Microbial Resource Comprehensive Utilization, Ministry of Agriculture, Huazhong Agricultural University, Wuhan, Hubei, China
| | - Lianfu Chen
- Institute of Applied Mycology, Plant Science and Technology College, Huazhong Agricultural University,Wuhan, Hubei, China; Key Laboratory of Agro-Microbial Resource Comprehensive Utilization, Ministry of Agriculture, Huazhong Agricultural University, Wuhan, Hubei, China
| | - Lianlian Yan
- Institute of Applied Mycology, Plant Science and Technology College, Huazhong Agricultural University,Wuhan, Hubei, China; Key Laboratory of Agro-Microbial Resource Comprehensive Utilization, Ministry of Agriculture, Huazhong Agricultural University, Wuhan, Hubei, China
| | - Yan Zhou
- Institute of Applied Mycology, Plant Science and Technology College, Huazhong Agricultural University,Wuhan, Hubei, China; Key Laboratory of Agro-Microbial Resource Comprehensive Utilization, Ministry of Agriculture, Huazhong Agricultural University, Wuhan, Hubei, China
| | - Yinbing Bian
- Institute of Applied Mycology, Plant Science and Technology College, Huazhong Agricultural University,Wuhan, Hubei, China; Key Laboratory of Agro-Microbial Resource Comprehensive Utilization, Ministry of Agriculture, Huazhong Agricultural University, Wuhan, Hubei, China.
| |
Collapse
|
229
|
Nikolić S, Lazić V, Veljović Đ, Mojović L. Production of bioethanol from pre-treated cotton fabrics and waste cotton materials. Carbohydr Polym 2017; 164:136-144. [DOI: 10.1016/j.carbpol.2017.01.090] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2016] [Revised: 01/23/2017] [Accepted: 01/25/2017] [Indexed: 12/18/2022]
|
230
|
Bilal M, Asgher M, Iqbal HMN, Hu H, Zhang X. Biotransformation of lignocellulosic materials into value-added products-A review. Int J Biol Macromol 2017; 98:447-458. [PMID: 28163129 DOI: 10.1016/j.ijbiomac.2017.01.133] [Citation(s) in RCA: 100] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2016] [Revised: 01/25/2017] [Accepted: 01/31/2017] [Indexed: 02/08/2023]
Abstract
In the past decade, with the key biotechnological advancements, lignocellulosic materials have gained a particular importance. In serious consideration of global economic, environmental and energy issues, research scientists have been re-directing their interests in (re)-valorizing naturally occurring lignocellulosic-based materials. In this context, lignin-modifying enzymes (LMEs) have gained considerable attention in numerous industrial and biotechnological processes. However, their lower catalytic efficiencies and operational stabilities limit their practical and multipurpose applications in various sectors. Therefore, to expand the range of natural industrial biocatalysts e.g. LMEs, significant progress related to the enzyme biotechnology has appeared. Owing to the abundant lignocellulose availability along with LMEs in combination with the scientific advances in the biotechnological era, solid-phase biocatalysts can be economically tailored on a large scale. This review article outlines first briefly on the lignocellulose materials as a potential source for biotransformation into value-added products including composites, fine chemicals, nutraceutical, delignification, and enzymes. Comprehensive information is also given on the purification and characterization of LMEs to present their potential for the industrial and biotechnological sector.
Collapse
Affiliation(s)
- Muhammad Bilal
- State Key Laboratory of Microbial Metabolism, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China.
| | - Muhammad Asgher
- Industrial Biotechnology Laboratory, Department of Biochemistry, University of Agriculture Faisalabad, Pakistan
| | - Hafiz M N Iqbal
- School of Engineering and Science, Tecnologico de Monterrey, Campus Monterrey, Ave. Eugenio Garza Sada 2501, Monterrey, N.L., CP 64849, Mexico.
| | - Hongbo Hu
- State Key Laboratory of Microbial Metabolism, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Xuehong Zhang
- State Key Laboratory of Microbial Metabolism, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China
| |
Collapse
|
231
|
Improvingthecatalytic properties and stability of immobilized γ-glutamyltranspeptidase by post-immobilization with Pharmalyte MT 8-10.5. Int J Biol Macromol 2017; 105:1581-1586. [PMID: 28414108 DOI: 10.1016/j.ijbiomac.2017.04.050] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2016] [Revised: 03/22/2017] [Accepted: 04/11/2017] [Indexed: 11/20/2022]
Abstract
γ-Glutamyltranspeptidase (GGT) is a dimeric protein that specifically catalyzes the transfer of γ-glutamyl in the optimum pH range of 8.5-9.0, but has poor in vitro stability under the alkaline conditions. In the present work, GGT was immobilized on a mesoporoustitania oxide whisker (MTWs) carrier to afford MTWs-GGT that was further modified with PharmalyteMT (Phar) 8.0-10.5 to yield MTWs-GGT-Phar. Phar absorbed on MTWs-GGT to form a buffering layer with an isoelectric point of ∼9.2 that isolated the immobilized enzyme from the liquid bulk and significantly in proved the pH tolerance and stability of the immobilized GGT. The MTWs-GGT-Phar exhibited a stable enzyme activity in the pH range of 6.0-11.0 and an optimum temperature 10°C higher than GGT. Its pH stability at pH 11.0 and thermal stability at 50°C were respectively 23.7 times and 19.4 times higher than those of GGT. In addition, the affinity constant of MTWs-GGT-Phar towards GpNA (Km) was 0.597mM, slightly lower than that of free GGT, indicating that Phar had a protective effect on the structure of GGT.
Collapse
|
232
|
Dotsenko AS, Rozhkova AM, Gusakov AV, Sinitsyn AP. Improving the efficiency of the bioconversion of plant raw materials with mutant cellulases of Penicillium verruculosum. CATALYSIS IN INDUSTRY 2017. [DOI: 10.1134/s2070050417010044] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
233
|
Draft Genome Sequence of Streptococcus caviae Strain Cavy grass 6 T, Isolated from Domesticated Guinea Pig Fecal Samples. GENOME ANNOUNCEMENTS 2017; 5:5/13/e00080-17. [PMID: 28360157 PMCID: PMC5374231 DOI: 10.1128/genomea.00080-17] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Streptococcus caviae strain Cavy grass 6T, isolated from fecal samples of pet guinea pigs, can metabolize a range of plant mono- and disaccharides, as well as polymeric carbohydrates. Here, we report the draft genome sequence of this strain, which comprises 2.11 Mb.
Collapse
|
234
|
da Silva Menezes B, Rossi DM, Ayub MAZ. Screening of filamentous fungi to produce xylanase and xylooligosaccharides in submerged and solid-state cultivations on rice husk, soybean hull, and spent malt as substrates. World J Microbiol Biotechnol 2017; 33:58. [PMID: 28238176 DOI: 10.1007/s11274-017-2226-5] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2016] [Accepted: 02/10/2017] [Indexed: 12/01/2022]
Abstract
We investigated the enzymatic complex produced by selected fungi strains isolated from the environment using the agro-industrial residues rice husk, soybean hull, and spent malt as substrates. Microbial growth was carried out in solid-state cultivation (SSC) and in submerged cultivations (SC) and the enzymatic activities of xylanase, cellulase, β-xylosidase, and β-glucosidase were determined. All substrates were effective in inducing enzymatic activities, with one strain of Aspergillus brasiliensis BLf1 showing maximum activities for all enzymes, except for cellulases. Using this fungus, the enzymatic activities of xylanase, cellulase, and β-glucosidase were generally higher in SSC compared to SC, producing maxima activities of 120.5, 25.3 and 47.4 U g-1 of dry substrate, respectively. β-xylosidase activity of 28.1 U g-1 of dry substrate was highest in SC. Experimental design was carried out to optimize xylanase activity by A. brasiliensis BLf1 in SSC using rice husk as substrate, producing maximum xylanase activity 183.5 U g-1 dry substrate, and xylooligosaccharides were produced and characterized. These results suggest A. brasiliensis BLf1 can be used to produce important lytic enzymes to be applied in the preparation of xylooligosaccharides.
Collapse
Affiliation(s)
- Bruna da Silva Menezes
- Biotechnology, Bioprocess, and Biocatalysis Group, Food Science and Technology Institute, Federal University of Rio Grande do Sul, Av. Bento Gonçalves 9500, PO Box 15090, Porto Alegre, RS, 91501-970, Brazil
| | - Daniele Misturini Rossi
- Biotechnology, Bioprocess, and Biocatalysis Group, Food Science and Technology Institute, Federal University of Rio Grande do Sul, Av. Bento Gonçalves 9500, PO Box 15090, Porto Alegre, RS, 91501-970, Brazil
| | - Marco Antônio Záchia Ayub
- Biotechnology, Bioprocess, and Biocatalysis Group, Food Science and Technology Institute, Federal University of Rio Grande do Sul, Av. Bento Gonçalves 9500, PO Box 15090, Porto Alegre, RS, 91501-970, Brazil.
| |
Collapse
|
235
|
Walker JA, Pattathil S, Bergeman LF, Beebe ET, Deng K, Mirzai M, Northen TR, Hahn MG, Fox BG. Determination of glycoside hydrolase specificities during hydrolysis of plant cell walls using glycome profiling. BIOTECHNOLOGY FOR BIOFUELS 2017; 10:31. [PMID: 28184246 PMCID: PMC5288845 DOI: 10.1186/s13068-017-0703-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2016] [Accepted: 01/06/2017] [Indexed: 05/29/2023]
Abstract
BACKGROUND Glycoside hydrolases (GHs) are enzymes that hydrolyze polysaccharides into simple sugars. To better understand the specificity of enzyme hydrolysis within the complex matrix of polysaccharides found in the plant cell wall, we studied the reactions of individual enzymes using glycome profiling, where a comprehensive collection of cell wall glycan-directed monoclonal antibodies are used to detect polysaccharide epitopes remaining in the walls after enzyme treatment and quantitative nanostructure initiator mass spectrometry (oxime-NIMS) to determine soluble sugar products of their reactions. RESULTS Single, purified enzymes from the GH5_4, GH10, and GH11 families of glycoside hydrolases hydrolyzed hemicelluloses as evidenced by the loss of specific epitopes from the glycome profiles in enzyme-treated plant biomass. The glycome profiling data were further substantiated by oxime-NIMS, which identified hexose products from hydrolysis of cellulose, and pentose-only and mixed hexose-pentose products from the hydrolysis of hemicelluloses. The GH10 enzyme proved to be reactive with the broadest diversity of xylose-backbone polysaccharide epitopes, but was incapable of reacting with glucose-backbone polysaccharides. In contrast, the GH5 and GH11 enzymes studied here showed the ability to react with both glucose- and xylose-backbone polysaccharides. CONCLUSIONS The identification of enzyme specificity for a wide diversity of polysaccharide structures provided by glycome profiling, and the correlated identification of soluble oligosaccharide hydrolysis products provided by oxime-NIMS, offers a unique combination to understand the hydrolytic capabilities and constraints of individual enzymes as they interact with plant biomass.
Collapse
Affiliation(s)
- Johnnie A. Walker
- US Department of Energy Great Lakes Bioenergy Research Center, University of Wisconsin-Madison, Madison, WI 53706 USA
- Department of Biochemistry, University of Wisconsin-Madison, Madison, WI 53706 USA
| | - Sivakumar Pattathil
- US Department of Energy Bioenergy Science Center, Oak Ridge National Laboratory, Oak Ridge, TN 37831 USA
- Complex Carbohydrate Research Center, University of Georgia, Athens, GA 30602 USA
| | - Lai F. Bergeman
- US Department of Energy Great Lakes Bioenergy Research Center, University of Wisconsin-Madison, Madison, WI 53706 USA
- Department of Biochemistry, University of Wisconsin-Madison, Madison, WI 53706 USA
| | - Emily T. Beebe
- US Department of Energy Great Lakes Bioenergy Research Center, University of Wisconsin-Madison, Madison, WI 53706 USA
- Department of Biochemistry, University of Wisconsin-Madison, Madison, WI 53706 USA
| | - Kai Deng
- US Department of Energy Joint Bioenergy Institute, Emeryville, CA 94608 USA
- Sandia National Laboratories, Livermore, CA 94551 USA
| | - Maryam Mirzai
- US Department of Energy Bioenergy Science Center, Oak Ridge National Laboratory, Oak Ridge, TN 37831 USA
- Complex Carbohydrate Research Center, University of Georgia, Athens, GA 30602 USA
| | - Trent R. Northen
- US Department of Energy Joint Bioenergy Institute, Emeryville, CA 94608 USA
- Lawrence Berkeley National Laboratory, Berkeley, CA 94720 USA
| | - Michael G. Hahn
- US Department of Energy Bioenergy Science Center, Oak Ridge National Laboratory, Oak Ridge, TN 37831 USA
- Complex Carbohydrate Research Center, University of Georgia, Athens, GA 30602 USA
| | - Brian G. Fox
- US Department of Energy Great Lakes Bioenergy Research Center, University of Wisconsin-Madison, Madison, WI 53706 USA
- Department of Biochemistry, University of Wisconsin-Madison, Madison, WI 53706 USA
| |
Collapse
|
236
|
Osiro KO, de Camargo BR, Satomi R, Hamann PRV, Silva JP, de Sousa MV, Quirino BF, Aquino EN, Felix CR, Murad AM, Noronha EF. Characterization of Clostridium thermocellum (B8) secretome and purified cellulosomes for lignocellulosic biomass degradation. Enzyme Microb Technol 2017; 97:43-54. [DOI: 10.1016/j.enzmictec.2016.11.002] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2016] [Revised: 11/04/2016] [Accepted: 11/05/2016] [Indexed: 11/16/2022]
|
237
|
Øverland M, Skrede A. Yeast derived from lignocellulosic biomass as a sustainable feed resource for use in aquaculture. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2017; 97:733-742. [PMID: 27558451 DOI: 10.1002/jsfa.8007] [Citation(s) in RCA: 78] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2016] [Revised: 08/19/2016] [Accepted: 08/22/2016] [Indexed: 06/06/2023]
Abstract
The global expansion in aquaculture production implies an emerging need of suitable and sustainable protein sources. Currently, the fish feed industry is dependent on high-quality protein sources of marine and plant origin. Yeast derived from processing of low-value and non-food lignocellulosic biomass is a potential sustainable source of protein in fish diets. Following enzymatic hydrolysis, the hexose and pentose sugars of lignocellulosic substrates and supplementary nutrients can be converted into protein-rich yeast biomass by fermentation. Studies have shown that yeasts such as Saccharomyces cerevisiae, Candida utilis and Kluyveromyces marxianus have favourable amino acid composition and excellent properties as protein sources in diets for fish, including carnivorous species such as Atlantic salmon and rainbow trout. Suitable downstream processing of the biomass to disrupt cell walls is required to secure high nutrient digestibility. A number of studies have shown various immunological and health benefits from feeding fish low levels of yeast and yeast-derived cell wall fractions. This review summarises current literature on the potential of yeast from lignocellulosic biomass as an alternative protein source for the aquaculture industry. It is concluded that further research and development within yeast production can be important to secure the future sustainability and economic viability of intensive aquaculture. © 2016 Society of Chemical Industry.
Collapse
Affiliation(s)
- Margareth Øverland
- Department of Animal and Aquacultural Sciences, Norwegian University of Life Sciences, P.O. Box 5003, N-1432, Ås, Norway
| | - Anders Skrede
- Department of Animal and Aquacultural Sciences, Norwegian University of Life Sciences, P.O. Box 5003, N-1432, Ås, Norway
| |
Collapse
|
238
|
Orita T, Sakka M, Kimura T, Sakka K. Recombinant cellulolytic or xylanolytic complex comprising the full-length scaffolding protein RjCipA and cellulase RjCel5B or xylanase RjXyn10C of Ruminiclostridium josui. Enzyme Microb Technol 2017; 97:63-70. [DOI: 10.1016/j.enzmictec.2016.10.021] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2016] [Revised: 10/14/2016] [Accepted: 10/30/2016] [Indexed: 11/26/2022]
|
239
|
Andriamanohiarisoamanana FJ, Matsunami N, Yamashiro T, Iwasaki M, Ihara I, Umetsu K. High-solids anaerobic mono-digestion of riverbank grass under thermophilic conditions. J Environ Sci (China) 2017; 52:29-38. [PMID: 28254050 DOI: 10.1016/j.jes.2016.05.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2015] [Revised: 04/14/2016] [Accepted: 05/03/2016] [Indexed: 06/06/2023]
Abstract
The purpose of this study was to investigate the potential of high-solids anaerobic mono-digestion of riverbank grass under thermophilic conditions, focusing on the effects of the strength and the amount of inoculum. Ensiled grass was inoculated with three different inocula; inoculum from liquid anaerobic digester (LI), inoculum from dry anaerobic digester (DI), and mixture of LI and DI (MI), at feedstock-to-inoculum ratio (FIR) of 1, 2 and 4. The ensiling process of riverbank grass reduced moisture content (p>0.05), while the hemicellulose content was significantly increased from 30.88% to 35.15% (p<0.05), on dry matter basis. The highest methane production was at an FIR of 2 with MI (167L/kg VSadded), which was significantly higher (p<0.05) than with DI, but not significant compared to LI (p>0.05). At an FIR of 4, digesters inoculated with LI and DI failed to produce methane, whereas 135LCH4/kg VSadded was obtained with MI. The kinetic studies showed that at an FIR of 1 with LI and MI, the inoculum had less of effects on the hydrolysis rate constant (0.269day-1 and 0.245day-1) and methane production (135 versus 149L/kg VSadded); rather, it affected the lag phase. In a thermophilic HS-AD of riverbank grass, the mixture of inoculum with low and high total solids content (TS) helps increase the TS of inoculum and digestion process. An FIR of 2 was deducted to be the limit for a better startup time and higher volumetric productivity of methane.
Collapse
Affiliation(s)
- Fetra J Andriamanohiarisoamanana
- Graduate School of Animal and Food Hygiene, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido 080-8555, Japan.
| | - Nobuyuki Matsunami
- Graduate School of Animal and Food Hygiene, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido 080-8555, Japan
| | - Takaki Yamashiro
- Graduate School of Animal and Food Hygiene, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido 080-8555, Japan
| | - Masahiro Iwasaki
- Graduate School of Animal and Food Hygiene, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido 080-8555, Japan
| | - Ikko Ihara
- Graduate School of Agriculture Science, Kobe University, Kobe 657-8501, Japan
| | - Kazutaka Umetsu
- Graduate School of Animal and Food Hygiene, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido 080-8555, Japan.
| |
Collapse
|
240
|
Fonseca-Maldonado R, Meleiro LP, Mendes LFS, Alves LF, Carli S, Morero LD, Basso LGM, Costa-Filho AJ, Ward RJ. Lignocellulose binding of a Cel5A-RtCBM11 chimera with enhanced β-glucanase activity monitored by electron paramagnetic resonance. BIOTECHNOLOGY FOR BIOFUELS 2017; 10:269. [PMID: 29163671 PMCID: PMC5686792 DOI: 10.1186/s13068-017-0964-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2017] [Accepted: 11/07/2017] [Indexed: 05/05/2023]
Abstract
BACKGROUND The Bacillus subtilis endo-β-1,4-glucanase (BsCel5A) hydrolyzes β-1,3-1,4-linked glucan, and the enzyme includes a family 3 carbohydrate-binding module (CBM3) that binds β-1,4-linked glucan. METHODS Here we investigate the BsCel5A β-1,3-1,4 glucanase activity after exchanging the CBM3 domain for the family 11 CBM from Ruminiclostridium thermocellum celH (RtCBM11) having β-1,3-1,4 glucan affinity. RESULTS The BsCel5A-RtCBM11 presents a 50.4% increase in Vmax, a 10% reduction in K0.5, and a 2.1-fold increase in catalytic efficiency. Enzyme mobility and binding to barley β-1,3-1,4 glucan and pre-treated sugarcane bagasse were investigated using Electron Paramagnetic Resonance (EPR) with Site-Directed Spin Labeling (SDSL) of the binding site regions of the CBM3 and RtCBM11 domains in the BsCel5A-CBM3 and BsCel5A-RtCBM11, respectively. Although higher mobility than the RtCBM11 was shown, no interaction of the spin-labeled CBM3 with β-1,3-1,4 glucan was observed. In contrast, a Ka value of 0.22 mg/mL was estimated from titration of the BsCel5A-RtCBM11 with β-1,3-1,4 glucan. Enzyme binding as inferred from altered EPR spectra of the BsCel5A-RtCBM11 was observed only after xylan or lignin extraction from sugarcane bagasse. Binding to xylan- or lignin-free lignocellulose was correlated with a 4.5- to 5-fold increase in total reducing sugar release as compared to the milled intact sugarcane bagasse, suggesting that xylan impedes enzyme access to the β-1,3-1,4 glucan. CONCLUSIONS These results show that the non-specific binding of the BsCel5A-RtCBM11 to the lignin component of the cell wall is minimal, and represent the first reported use of EPR to directly study the interaction of glycoside hydrolyse enzymes with natural insoluble substrates.
Collapse
Affiliation(s)
- Raquel Fonseca-Maldonado
- Departamento de Química, Faculdade de Filosofia Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Avenida Bandeirantes 3900, Ribeirão Preto, São Paulo Brazil
- Departamento de Gestão, Instituto Federal de Educação, Ciência e Tecnologia de São Paulo/IFSP Campus Jacareí, Jacareí, São Paulo Brazil
| | - Luana P. Meleiro
- Departamento de Química, Faculdade de Filosofia Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Avenida Bandeirantes 3900, Ribeirão Preto, São Paulo Brazil
| | - Luís F. S. Mendes
- Departamento de Física, Faculdade de Filosofia Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, São Paulo Brazil
| | - Luana F. Alves
- Departamento de Bioquímica, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, São Paulo Brazil
| | - Sibeli Carli
- Departamento de Química, Faculdade de Filosofia Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Avenida Bandeirantes 3900, Ribeirão Preto, São Paulo Brazil
| | - Lucas D. Morero
- Departamento de Física, Faculdade de Filosofia Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, São Paulo Brazil
| | - Luis G. M. Basso
- Departamento de Física, Faculdade de Filosofia Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, São Paulo Brazil
| | - Antonio J. Costa-Filho
- Departamento de Física, Faculdade de Filosofia Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, São Paulo Brazil
| | - Richard J. Ward
- Departamento de Química, Faculdade de Filosofia Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Avenida Bandeirantes 3900, Ribeirão Preto, São Paulo Brazil
| |
Collapse
|
241
|
Wang X, Rong L, Wang M, Pan Y, Zhao Y, Tao F. Improving the activity of endoglucanase I (EGI) from Saccharomyces cerevisiae by DNA shuffling. RSC Adv 2017. [DOI: 10.1039/c6ra26508a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
To enhance the endo-β-1,4-glucanase activity of three mixedTrichodermasp. (Trichoderma reesei, Trichoderma longibrachiatum, andTrichoderma pseudokoningii), we optimized the efficiency of the encoding gene using DNA shuffling andSaccharomyces cerevisiaeINVSc1 as a host.
Collapse
Affiliation(s)
- Xu Wang
- College of Food Science and Technology
- Shanghai Ocean University
- Shanghai
- China
- School of Life Sciences
| | - Liang Rong
- USC School of Pharmacy
- University of Southern California
- Los Angeles
- USA
| | - Mingfu Wang
- College of Food Science and Technology
- Shanghai Ocean University
- Shanghai
- China
| | - Yingjie Pan
- College of Food Science and Technology
- Shanghai Ocean University
- Shanghai
- China
| | - Yong Zhao
- College of Food Science and Technology
- Shanghai Ocean University
- Shanghai
- China
| | - Fang Tao
- School of Life Sciences
- Anhui Agricultural University
- China
| |
Collapse
|
242
|
Abstract
For modern biotechnology there is a steady need to identify novel enzymes. In biotechnological applications, however, enzymes often must function under extreme and nonnatural conditions (i.e., in the presence of solvents, high temperature and/or at extreme pH values). Cellulases have many industrial applications from the generation of bioethanol, a realistic long-term energy source, to the finishing of textiles. These industrial processes require cellulolytic activity under a wide range of pH, temperature, and ionic conditions, and they are usually carried out by mixtures of cellulases. Investigation of the broad diversity of cellulolytic enzymes involved in the natural degradation of cellulose is necessary for optimizing these processes.
Collapse
Affiliation(s)
- Nele Ilmberger
- Microbiology & Biotechnology, Biocenter Klein Flottbek, University of Hamburg, Ohnhorststr. 18, 22609, Hamburg, Germany
| | - Wolfgang R Streit
- Microbiology & Biotechnology, Biocenter Klein Flottbek, University of Hamburg, Ohnhorststr. 18, 22609, Hamburg, Germany.
| |
Collapse
|
243
|
Mahapatra S, Vickram AS, Sridharan TB, Parameswari R, Pathy MR. Screening, production, optimization and characterization of β-glucosidase using microbes from shellfish waste. 3 Biotech 2016; 6:213. [PMID: 28330285 PMCID: PMC5047857 DOI: 10.1007/s13205-016-0530-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2016] [Accepted: 09/19/2016] [Indexed: 11/30/2022] Open
Abstract
An extracellular β-glucosidase was isolated from Proteus mirabilis VIT117 found to be growing on prawn shells. The enzyme production was found to be enhanced (14.58 U/ml) when the culture was maintained at pH 9 and provided with sorbitol as carbon source, yeast extract as nitrogen source and incubated at 37 °C for approximately 72 h. Statistical methods like Plackett–Burman and RSM were also applied here to study the effects of different combinations of growth parameters for the bacteria, where the most significant parameters were found to be inoculum size, pH, yeast extract, incubation time and sorbitol. The optimum concentrations of inoculum size, pH and yeast extract determined by RSM were 2 %, 9 and 2 %, respectively. Partial purification of the protein was done by ammonium sulfate precipitation, followed by dialysis, gel filtration chromatography and SDS-PAGE. The enzyme was found to have a molecular weight of approximately 50 kDa and was observed to be most active at 37 °C in pH 9, with a sharp decline in the enzyme activity when temperature or the pH was increased. Enzyme kinetics study was performed to understand the catalytic behavior of the enzyme and it was found that our β-glucosidase had 5.613 U/ml and 0.082 mM as Vmax and Km values, respectively.
Collapse
Affiliation(s)
| | - A S Vickram
- SBST, VIT University, Vellore, 632014, Tamil Nadu, India
| | - T B Sridharan
- SBST, VIT University, Vellore, 632014, Tamil Nadu, India
| | - R Parameswari
- SBST, VIT University, Vellore, 632014, Tamil Nadu, India
| | - M Ramesh Pathy
- SBST, VIT University, Vellore, 632014, Tamil Nadu, India.
| |
Collapse
|
244
|
Wanmolee W, Sornlake W, Rattanaphan N, Suwannarangsee S, Laosiripojana N, Champreda V. Biochemical characterization and synergism of cellulolytic enzyme system from Chaetomium globosum on rice straw saccharification. BMC Biotechnol 2016; 16:82. [PMID: 27871321 PMCID: PMC5117696 DOI: 10.1186/s12896-016-0312-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2016] [Accepted: 11/01/2016] [Indexed: 12/16/2022] Open
Abstract
Background Efficient hydrolysis of lignocellulosic materials to sugars for conversion to biofuels and chemicals is a key step in biorefinery. Designing an active saccharifying enzyme system with synergy among their components is considered a promising approach. Results In this study, a lignocellulose-degrading enzyme system of Chaetomium globosum BCC5776 (CG-Cel) was characterized for its activity and proteomic profiles, and synergism with accessory enzymes. The highest cellulase productivity of 0.40 FPU/mL was found for CG-Cel under the optimized submerged fermentation conditions on 1% (w/v) EPFB (empty palm fruit bunch), 2% microcrystalline cellulose (Avicel®) and 1% soybean meal (SBM) at 30 °C, pH 5.8 for 6 d. CG-Cel worked optimally at 50–60 °C in an acidic pH range. Proteomics analysis by LC/MS/MS revealed a complex enzyme system composed of core cellulases and accessory hydrolytic/non-hydrolytic enzymes attacking plant biopolymers. A synergistic enzyme system comprising the CG-Cel, a β-glucosidase (Novozyme® 188) and a hemicellulase Accellerase® XY was optimized on saccharification of alkaline-pretreated rice straw by a mixture design approach. Applying a full cubic model, the optimal ratio of ternary enzyme mixture containing CG-Cel: Novozyme® 188: Accellerase® XY of 44.4:20.6:35.0 showed synergistic enhancement on reducing sugar yield with a glucose releasing efficiency of 256.4 mg/FPU, equivalent to a 2.9 times compared with that from CG-Cel alone. Conclusions The work showed an approach for developing an active synergistic enzyme system based on the newly characterized C. globosum for lignocellulose saccharification and modification in bio-industries. Electronic supplementary material The online version of this article (doi:10.1186/s12896-016-0312-7) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
- Wanwitoo Wanmolee
- The Joint Graduate School for Energy and Environment (JGSEE), King Mongkut's University of Technology Thonburi, Prachauthit Road, Bangmod, Bangkok, 10140, Thailand
| | - Warasirin Sornlake
- Enzyme Technology Laboratory, National Center for Genetic Engineering and Biotechnology (BIOTEC), 113 Thailand Science Park, Phahonyothin Road, Khlong Luang, Pathumthani, 12120, Thailand
| | - Nakul Rattanaphan
- Bioprocess Laboratory, National Center for Genetic Engineering and Biotechnology (BIOTEC), 113 Thailand Science Park, Phahonyothin Road, Khlong Luang, Pathumthani, 12120, Thailand
| | - Surisa Suwannarangsee
- Enzyme Technology Laboratory, National Center for Genetic Engineering and Biotechnology (BIOTEC), 113 Thailand Science Park, Phahonyothin Road, Khlong Luang, Pathumthani, 12120, Thailand
| | - Navadol Laosiripojana
- The Joint Graduate School for Energy and Environment (JGSEE), King Mongkut's University of Technology Thonburi, Prachauthit Road, Bangmod, Bangkok, 10140, Thailand.,BIOTEC-JGSEE Integrative Biorefinery Laboratory, Innovation Cluster 2 Building, 113 Thailand Science Park, Phahonyothin Road, Khlong Luang, Pathumthani, 12120, Thailand
| | - Verawat Champreda
- Enzyme Technology Laboratory, National Center for Genetic Engineering and Biotechnology (BIOTEC), 113 Thailand Science Park, Phahonyothin Road, Khlong Luang, Pathumthani, 12120, Thailand. .,BIOTEC-JGSEE Integrative Biorefinery Laboratory, Innovation Cluster 2 Building, 113 Thailand Science Park, Phahonyothin Road, Khlong Luang, Pathumthani, 12120, Thailand.
| |
Collapse
|
245
|
Optimization of Cellulase and Xylanase Production by Micrococcus Species under Submerged Fermentation. SUSTAINABILITY 2016. [DOI: 10.3390/su8111168] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
246
|
Ibrahim NA, Abdel-Aziz MS, Eid BM, Hamdy SM, Abdallah SE. Biosynthesis, optimization and potential textile application of fungal cellulases/xylanase multifunctional enzyme preparation from Penicillium sp. SAF6. BIOCATAL BIOTRANSFOR 2016. [DOI: 10.1080/10242422.2016.1237943] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Nabil A. Ibrahim
- Textile Research Division, National Research Center, Giza, Egypt,
| | | | - Basma M. Eid
- Textile Research Division, National Research Center, Giza, Egypt,
| | - Soha M. Hamdy
- Chemistry Department, Faculty of Science, Fayoum University, Faiyum, Egypt
| | | |
Collapse
|
247
|
An overview of holocellulose-degrading enzyme immobilization for use in bioethanol production. ACTA ACUST UNITED AC 2016. [DOI: 10.1016/j.molcatb.2016.08.006] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
248
|
Colabardini AC, Valkonen M, Huuskonen A, Siika-aho M, Koivula A, Goldman GH, Saloheimo M. Expression of Two Novel β-Glucosidases from Chaetomium atrobrunneum in Trichoderma reesei and Characterization of the Heterologous Protein Products. Mol Biotechnol 2016; 58:821-831. [DOI: 10.1007/s12033-016-9981-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
249
|
Ergün BG, Çalık P. Lignocellulose degrading extremozymes produced by Pichia pastoris: current status and future prospects. Bioprocess Biosyst Eng 2016; 39:1-36. [PMID: 26497303 DOI: 10.1007/s00449-015-1476-6] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2015] [Accepted: 09/21/2015] [Indexed: 02/06/2023]
Abstract
In this review article, extremophilic lignocellulosic enzymes with special interest on xylanases, β-mannanases, laccases and finally cellulases, namely, endoglucanases, exoglucanases and β-glucosidases produced by Pichia pastoris are reviewed for the first time. Recombinant lignocellulosic extremozymes are discussed from the perspectives of their potential application areas; characteristics of recombinant and native enzymes; the effects of P. pastoris expression system on recombinant extremozymes; and their expression levels and applied strategies to increase the enzyme expression yield. Further, effects of enzyme domains on activity and stability, protein engineering via molecular dynamics simulation and computational prediction, and site-directed mutagenesis and amino acid modifications done are also focused. Superior enzyme characteristics and improved stability due to the proper post-translational modifications and better protein folding performed by P. pastoris make this host favourable for extremozyme production. Especially, glycosylation contributes to the structure, function and stability of enzymes, as generally glycosylated enzymes produced by P. pastoris exhibit better thermostability than non-glycosylated enzymes. However, there has been limited study on enzyme engineering to improve catalytic efficiency and stability of lignocellulosic enzymes. Thus, in the future, studies should focus on protein engineering to improve stability and catalytic efficiency via computational modelling, mutations, domain replacements and fusion enzyme technology. Also metagenomic data need to be used more extensively to produce novel enzymes with extreme characteristics and stability.
Collapse
|
250
|
Increased yield of β-glucosidase-catalyzed hydrolysis reactions in the presence of betaine-type metabolite analog. Bioprocess Biosyst Eng 2016; 40:153-159. [PMID: 27655352 DOI: 10.1007/s00449-016-1684-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2016] [Accepted: 09/14/2016] [Indexed: 10/21/2022]
Abstract
β-Glucosidases (EC 3.2.1.21), abundant enzymes distributed in animals, plants and microorganism, has been generating lots of attentions for bioethanol production from cellulosic biomass. In this study, using three different origins of β-glucosidases, glucose productivity of β-glucosidase-catalyzed hydrolysis reactions in the presence of synthetic betaine-type metabolite analog (2-N,N,N-tri-n-butylammonium) acetate, was investigated. By the addition of the analog, the hydrolysis yields for all β-glucosidases was highly improved from 4-13 to 64-100 %. To understand the factors affecting on the yield enhancements, the kinetic parameters, inhibition constants of end-product and temporal stability of β-glucosidases were compared. As a result, enhancement of the yields is mainly related to the increase in the temporal stability of β-glucosidases in the presence of the analog. The present findings lead to not only improve the glucose productivity of β-glucosidase-catalyzed hydrolysis reaction toward bioethanol production but also apply to a new stabilization method for various unstable enzymes.
Collapse
|