51
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Saroj P, P M, Narasimhulu K. Characterization of thermophilic fungi producing extracellular lignocellulolytic enzymes for lignocellulosic hydrolysis under solid-state fermentation. BIORESOUR BIOPROCESS 2018. [DOI: 10.1186/s40643-018-0216-6] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
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52
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Gomes ACSM, Santos SRD, Ribeiro MC, Cravo PVL, Vieira JDG, Souza KMCDE, Amaral AC. Is there still room to explore cyclodextrin glycosyltransferase-producers in Brazilian biodiversity? AN ACAD BRAS CIENC 2018; 90:1473-1480. [PMID: 29898106 DOI: 10.1590/0001-3765201820170670] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2017] [Accepted: 10/30/2017] [Indexed: 11/22/2022] Open
Abstract
In the present work, different Brazilian biomes aiming to identify and select cyclodextrin glycosyltransferase-producer bacteria are explored. This enzyme is responsible for converting starch to cyclodextrin, which are interesting molecules to carry other substances of economic interest applied by textile, pharmaceutical, food, and other industries. Based on the enzymatic index, 12 bacteria were selected and evaluated, considering their capacity to produce the enzyme in culture media containing different starch sources. It was observed that the highest yields were presented by the bacteria when grown in cornstarch. These bacteria were also characterized by sequencing of the 16S rRNA region and were classified as Bacillus, Paenibacillus, Gracilibacillus and Solibacillus.
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Affiliation(s)
- Andrea C S M Gomes
- Instituto de Patologia Tropical e Saúde Pública, Universidade Federal de Goiás, Rua 235, s/n, Setor Universitário, 74605-050 Goiânia, GO, Brazil
| | - Samuel R Dos Santos
- Instituto de Patologia Tropical e Saúde Pública, Universidade Federal de Goiás, Rua 235, s/n, Setor Universitário, 74605-050 Goiânia, GO, Brazil.,Instituto de Ciências Biomédicas II, Universidade de São Paulo, Av. Prof. Lineu Prestes, 1374, 05508-900 Butantã, SP, Brazil
| | - Maycon C Ribeiro
- Instituto de Patologia Tropical e Saúde Pública, Universidade Federal de Goiás, Rua 235, s/n, Setor Universitário, 74605-050 Goiânia, GO, Brazil
| | - Pedro V L Cravo
- Instituto de Higiene e Medicina Tropical, Universidade Nova de Lisboa, Rua da Junqueira, 100, 1349-008 Lisboa, Portugal
| | - José Daniel G Vieira
- Instituto de Patologia Tropical e Saúde Pública, Universidade Federal de Goiás, Rua 235, s/n, Setor Universitário, 74605-050 Goiânia, GO, Brazil
| | - Keili M C DE Souza
- Instituto de Patologia Tropical e Saúde Pública, Universidade Federal de Goiás, Rua 235, s/n, Setor Universitário, 74605-050 Goiânia, GO, Brazil
| | - Andre C Amaral
- Instituto de Patologia Tropical e Saúde Pública, Universidade Federal de Goiás, Rua 235, s/n, Setor Universitário, 74605-050 Goiânia, GO, Brazil
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53
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Coronado-Ruiz C, Avendaño R, Escudero-Leyva E, Conejo-Barboza G, Chaverri P, Chavarría M. Two new cellulolytic fungal species isolated from a 19 th-century art collection. Sci Rep 2018; 8:7492. [PMID: 29748544 PMCID: PMC5945893 DOI: 10.1038/s41598-018-24934-7] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2017] [Accepted: 04/12/2018] [Indexed: 11/08/2022] Open
Abstract
The archive of the Universidad de Costa Rica maintains a nineteenth-century French collection of drawings and lithographs in which the biodeterioration by fungi is rampant. Because of nutritional conditions in which these fungi grew, we suspected that they possessed an ability to degrade cellulose. In this work our goal was to isolate and identify the fungal species responsible for the biodegradation of a nineteenth-century art collection and determine their cellulolytic activity. Fungi were isolated using potato-dextrose-agar (PDA) and water-agar with carboxymethyl cellulose (CMC). The identification of the fungi was assessed through DNA sequencing (nrDNA ITS and α-actin regions) complemented with morphological analyses. Assays for cellulolytic activity were conducted with Gram's iodine as dye. Nineteen isolates were obtained, of which seventeen were identified through DNA sequencing to species level, belonging mainly to genera Arthrinium, Aspergillus, Chaetomium, Cladosporium, Colletotrichum, Penicillium and Trichoderma. For two samples that could not be identified through their ITS and α-actin sequences, a morphological analysis was conducted; they were identified as new species, named Periconia epilithographicola sp. nov. and Coniochaeta cipronana sp. nov. Qualitative tests showed that the fungal collection presents important cellulolytic activity.
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Affiliation(s)
- Carolina Coronado-Ruiz
- Centro Nacional de Innovaciones Biotecnológicas (CENIBiot), CeNAT-CONARE, 1174-1200, San Jose, Costa Rica
- Centro de Investigaciones en Productos Naturales (CIPRONA), Universidad de Costa Rica, 11501-2060, San Jose, Costa Rica
| | - Roberto Avendaño
- Centro Nacional de Innovaciones Biotecnológicas (CENIBiot), CeNAT-CONARE, 1174-1200, San Jose, Costa Rica
| | - Efraín Escudero-Leyva
- Centro de Investigaciones en Productos Naturales (CIPRONA), Universidad de Costa Rica, 11501-2060, San Jose, Costa Rica
- Escuela de Biología, Universidad de Costa Rica, 11501-2060, San Jose, Costa Rica
| | - Geraldine Conejo-Barboza
- Escuela de Química, Universidad de Costa Rica, 11501-2060, San Jose, Costa Rica
- Instituto de Investigaciones en Arte (II Arte), 11501-2060, San Jose, Costa Rica
| | - Priscila Chaverri
- Centro de Investigaciones en Productos Naturales (CIPRONA), Universidad de Costa Rica, 11501-2060, San Jose, Costa Rica
- Escuela de Biología, Universidad de Costa Rica, 11501-2060, San Jose, Costa Rica
- Department of Plant Science and Landscape Architecture, University of Maryland, College Park, MD, 20742, Maryland, USA
| | - Max Chavarría
- Centro Nacional de Innovaciones Biotecnológicas (CENIBiot), CeNAT-CONARE, 1174-1200, San Jose, Costa Rica.
- Centro de Investigaciones en Productos Naturales (CIPRONA), Universidad de Costa Rica, 11501-2060, San Jose, Costa Rica.
- Escuela de Química, Universidad de Costa Rica, 11501-2060, San Jose, Costa Rica.
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Abstract
The conversion of renewable lignocellulosic biomass into fuels, chemicals, and high-value materials using the biochemical platform has been considered the most sustainable alternative for the implementation of future biorefineries. However, the high cost of the cellulolytic enzymatic cocktails used in the saccharification step significantly affects the economics of industrial large-scale conversion processes. The on-site production of enzymes, integrated to the biorefinery plant, is being considered as a potential strategy that could be used to reduce costs. In such approach, the microbial production of enzymes can be carried out using the same lignocellulosic biomass as feedstock for fungal development and biofuels production. Most of the microbial cultivation processes for the production of industrial enzymes have been developed using the conventional submerged fermentation. Recently, a sequential solid-state followed by submerged fermentation has been described as a potential alternative cultivation method for cellulolytic enzymes production. This chapter presents the detailed procedure of the sequential cultivation method, which could be employed for the on-site production of the cellulolytic enzymes required to convert lignocellulosic biomass into simple sugars.
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55
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Maroldi MMC, Vasconcellos VM, Lacava PT, Farinas CS. Potential of Mangrove-Associated Endophytic Fungi for Production of Carbohydrolases with High Saccharification Efficiency. Appl Biochem Biotechnol 2017; 184:806-820. [PMID: 28866806 DOI: 10.1007/s12010-017-2590-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2017] [Accepted: 08/29/2017] [Indexed: 11/28/2022]
Abstract
The endophytic fungi represent a potential source of microorganisms for enzyme production. However, there have been only few studies exploiting their potential for the production of enzymes of industrial interest, such as the (hemi)cellulolytic enzymatic cocktail required in the hydrolysis of lignocellulosic biomass. Here, a collection of endophytic fungi isolated from mangrove tropical forests was evaluated for the production of carbohydrolases and performance on the hydrolysis of cellulose. For that, 41 endophytic strains were initially screened using a plate assay containing crystalline cellulose as the sole carbon source and the selected strains were cultivated under solid-state fermentation for endoglucanase, β-glucosidase, and xylanase enzyme quantification. The hydrolysis of a cellulosic material with the enzymes from endophytic strains of the Aspergillus genus resulted in glucose and conversion values more than twofold higher than the reference strains (Aspergillus niger F12 and Trichoderma reesei Rut-C30). Particularly, the enzymes from strains A. niger 56 (3) and A. awamori 82 (4) showed a distinguished saccharification performance, reaching cellulose conversion values of about 35% after 24 h. Linking hydrolysis performance to the screening steps played an important role towards finding potential fungal strains for producing enzymatic cocktails with high saccharification efficiency. These results indicate the potential of mangrove-associated endophytic fungi for production of carbohydrolases with efficient performance in the hydrolysis of biomass, thus contributing to the implementation of future biorefineries.
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Affiliation(s)
- M M C Maroldi
- Embrapa Instrumentation, Rua XV de Novembro 1452, São Carlos, São Paulo, 13561-206, Brazil.,Center of Biological Sciences and Health, Federal University of São Carlos, PO Box 676, São Carlos, São Paulo, 13565-905, Brazil
| | - V M Vasconcellos
- Embrapa Instrumentation, Rua XV de Novembro 1452, São Carlos, São Paulo, 13561-206, Brazil.,Graduate Program of Chemical Engineering, Federal University of São Carlos, PO Box 676, São Carlos, São Paulo, 13565-905, Brazil
| | - P T Lacava
- Center of Biological Sciences and Health, Federal University of São Carlos, PO Box 676, São Carlos, São Paulo, 13565-905, Brazil
| | - C S Farinas
- Embrapa Instrumentation, Rua XV de Novembro 1452, São Carlos, São Paulo, 13561-206, Brazil. .,Graduate Program of Chemical Engineering, Federal University of São Carlos, PO Box 676, São Carlos, São Paulo, 13565-905, Brazil.
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56
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Bedade D, Berezina O, Singhal R, Deska J, Shamekh S. Extracellular xylanase production from a new xylanase producer Tuber maculatum mycelium under submerged fermentation and its characterization. BIOCATALYSIS AND AGRICULTURAL BIOTECHNOLOGY 2017. [DOI: 10.1016/j.bcab.2017.07.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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57
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Kazeem MO, Shah UKM, Baharuddin AS, AbdulRahman NA. Prospecting Agro-waste Cocktail: Supplementation for Cellulase Production by a Newly Isolated Thermophilic B. licheniformis 2D55. Appl Biochem Biotechnol 2017; 182:1318-1340. [PMID: 28176140 PMCID: PMC5534209 DOI: 10.1007/s12010-017-2401-z] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2016] [Accepted: 01/09/2017] [Indexed: 01/17/2023]
Abstract
Bacteria isolated from thermophilic environment that can produce cellulase as well as utilise agro-waste biomass have a high potential for developing thermostable cellulase required in the biofuel industry. The cost for cellulase represents a significant challenge in converting lignocellulose to fermentable sugars for biofuel production. Among three potential bacteria examined, Bacillus licheniformis 2D55 (accession no. KT799651) was found to produce the highest cellulolytic activity (CMCase 0.33 U/mL and FPase 0.09 U/mL) at 18–24 h fermentation when grown on microcrystalline cellulose (MCC) as a carbon source in shake flask at 50 °C. Cellulase production process was further conducted on the untreated and NaOH pretreated rice straw (RS), rice husk (RH), sugarcane bagasse (BAG) and empty fruit bunch (EFB). Untreated BAG produced the highest FPase (0.160 U/mL), while the highest CMCase (0.150 U/mL) was supported on the pretreated RH. The mixture of untreated BAG and pretreated RH as agro-waste cocktail has remarkably improved CMCase (3.7- and 1.4-fold) and FPase (2.5- and 11.5-fold) compared to the untreated BAG and pretreated RH, respectively. The mechanism of cellulase production explored through SEM analysis and the location of cellulase enzymes of the isolate was also presented. Agro-waste cocktail supplementation provides an alternative method for an efficient production of cellulase.
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Affiliation(s)
- Muinat Olanike Kazeem
- Department of Bioprocess Technology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, 43400, Serdang, Selangor, Malaysia.,Department of Microbiology, Faculty of Life Sciences, University of Ilorin, Ilorin, Kwara State, 1515, Nigeria
| | - Umi Kalsom Md Shah
- Department of Bioprocess Technology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, 43400, Serdang, Selangor, Malaysia
| | - Azhari Samsu Baharuddin
- Department of Process and Food Engineering, Faculty of Engineering, Universiti Putra Malaysia, 43400 UPM, Serdang, Selangor, Malaysia
| | - Nor' Aini AbdulRahman
- Department of Bioprocess Technology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, 43400, Serdang, Selangor, Malaysia.
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58
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Efficient screening of potential cellulases and hemicellulases produced by Bosea sp. FBZP-16 using the combination of enzyme assays and genome analysis. World J Microbiol Biotechnol 2017; 33:29. [PMID: 28058637 DOI: 10.1007/s11274-016-2198-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2016] [Accepted: 12/22/2016] [Indexed: 10/20/2022]
Abstract
Identification of bacteria that produce carbohydrolytic enzymes is extremely important given the increased demand for these enzymes in many industries. Twenty lignocellulose-degrading bacterial isolates from Algerian compost and different soils were screened for their potential to produce different enzymes involved in biomass deconstruction. Based on 16S rRNA gene sequencing, the isolates belonged to Proteobacteria and Actinobacteria. Differences among species were reflected both as the presence/absence of enzymes or at the level of enzyme activity. Among the most active species, Bosea sp. FBZP-16 demonstrated cellulolytic activity on both amorphous cellulose (CMC) and complex lignocellulose (wheat straw) and was selected for whole-genomic sequencing. The genome sequencing revealed the presence of a complex enzymatic machinery required for organic matter decomposition. Analysis of the enzyme-encoding genes indicated that multiple genes for endoglucanase, xylanase, β-glucosidase and β-mannosidase are present in the genome with enzyme activities displayed by the bacterium, while other enzymes, such as certain cellobiohydrolases, were not detected at the genomic level. This indicates that a combination of functional screening of bacterial cultures with the use of genome-derived information is important for the prediction of potential enzyme production. These results provide insight into their possible exploitation for the production of fuels and chemicals derived from plant biomass.
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59
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Zhang J, Hou H, Chen G, Wang S, Zhang J. The isolation and functional identification on producing cellulase of Pseudomonas mendocina. Bioengineered 2016; 7:382-391. [PMID: 27710430 DOI: 10.1080/21655979.2016.1227143] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
Abstract
The straw can be degraded efficiently into humus by powerful enzymes from microorganisms, resulting in the accelerated circulation of N,P,K and other effective elements in ecological system. We isolated a strain through screening the straw degradation strains from natural humic straw in the low temperature area in northeast of china, which can produce cellulase efficiently. The strain was identified as Pseudomonas mendocina by using morphological, physiological, biochemical test, and molecular biological test, with the functional clarification on producing cellulase for Pseudomonas mendocina for the first time. The enzyme force constant Km and the maximum reaction rate (Vmax) of the strain were 0.3261 g/L and 0.1525 mg/(min.L) through the enzyme activity detection, and the molecular weight of the enzyme produced by the strain were 42.4 kD and 20.4 kD based on SDS-PAGE. The effects of various ecological factors such as temperature, pH and nematodes on the enzyme produced by the strain in the micro ecosystem in plant roots were evaluated. The result showed that the optimum temperature was 28°C, and the best pH was 7.4∼7.8, the impact heavy metal was Pb2+ and the enzyme activity and biomass of Pseudomonas mendocina increased the movement and predation of nematodes.
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Affiliation(s)
- Jianfeng Zhang
- a Bioengineering Department, School of Life Sciences , Jilin Agricultural University, Jilin Province Innovation Platform of Straw Comprehensive Utilization Technology , Changchun , P. R. China
| | - Hongyan Hou
- a Bioengineering Department, School of Life Sciences , Jilin Agricultural University, Jilin Province Innovation Platform of Straw Comprehensive Utilization Technology , Changchun , P. R. China
| | - Guang Chen
- a Bioengineering Department, School of Life Sciences , Jilin Agricultural University, Jilin Province Innovation Platform of Straw Comprehensive Utilization Technology , Changchun , P. R. China
| | - Shusheng Wang
- a Bioengineering Department, School of Life Sciences , Jilin Agricultural University, Jilin Province Innovation Platform of Straw Comprehensive Utilization Technology , Changchun , P. R. China
| | - Jiejing Zhang
- a Bioengineering Department, School of Life Sciences , Jilin Agricultural University, Jilin Province Innovation Platform of Straw Comprehensive Utilization Technology , Changchun , P. R. China
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60
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Buddana SK, Reddy Shetty P, Raja Surya Krothapalli SR. An endolytic mutanase from novel strain Paracoccus mutanolyticus: its application potential in dentistry. J Med Microbiol 2016; 65:985-991. [PMID: 27452833 DOI: 10.1099/jmm.0.000321] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Mutanase, α-(1→3)-glucanase, belonging to the family glucanohydrolase, catalyses mutan [α-(1→3)-glucan] synthesized by cariogenic streptococci and hence has potential in caries prophylaxis. A novel bacterial strain with potential to produce higher mutanase (glucanohydrolase) activity was isolated from soils contaminated with cellulosic waste. One of the isolated strains, RSP-02, was subjected to biochemical and 16S rRNA molecular analysis, and we noticed that it belongs to the genus Paracoccus. The mutanase production (800- 1200 U l-1) in this strain was growth associated and substrate induced, and the activity was comparable with the strains reported earlier. The enzyme displayed a molecular mass of 138 kDa by native PAGE studies, showed endolytic activity and produced nigerose as end product. In vitro studies revealed production of 140±2.82 µg of glucose equivalents in 30 min from the biofilm formed on glass surface indicating its potentiality in dentistry. To the best of our knowledge, this is the first report on the production of mutanase by Paracoccus sp.; hence, this isolated bacterial strain is designated as Paracoccus mutanolyticus RSP-02.
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Affiliation(s)
- Sudheer Kumar Buddana
- Academy of Scientific and Innovative Research, New Delhi, India.,Bioengineering and Environmental Sciences, CSIR-Indian Institute of Chemical Technology, Hyderabad, India
| | - Prakasham Reddy Shetty
- Bioengineering and Environmental Sciences, CSIR-Indian Institute of Chemical Technology, Hyderabad, India
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61
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Ordaz-Hernández A, Ortega-Sánchez E, Montesinos-Matías R, Hernández-Martínez R, Torres-Martínez D, Loera O. Morphological and enzymatic response of the thermotolerant fungusFomessp. EUM1 in solid state fermentation under thermal stress. FEMS Microbiol Lett 2016; 363:fnw177. [DOI: 10.1093/femsle/fnw177] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/16/2016] [Indexed: 11/13/2022] Open
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62
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Characterization, optimization, and scale-up of cellulases production by trichoderma reesei cbs 836.91 in solid-state fermentation using agro-industrial products. Bioprocess Biosyst Eng 2015; 38:2117-28. [DOI: 10.1007/s00449-015-1451-2] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2015] [Accepted: 07/30/2015] [Indexed: 10/23/2022]
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63
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Otero DM, Cadaval CL, Teixeira LM, Rosa CA, Sanzo AVL, Kalil SJ. Screening of yeasts capable of producing cellulase-free xylanase. ACTA ACUST UNITED AC 2015. [DOI: 10.5897/ajb2015.14476] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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64
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de Assis LJ, Ries LNA, Savoldi M, dos Reis TF, Brown NA, Goldman GH. Aspergillus nidulans protein kinase A plays an important role in cellulase production. BIOTECHNOLOGY FOR BIOFUELS 2015; 8:213. [PMID: 26690721 PMCID: PMC4683954 DOI: 10.1186/s13068-015-0401-1] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2015] [Accepted: 11/30/2015] [Indexed: 05/17/2023]
Abstract
BACKGROUND The production of bioethanol from lignocellulosic feedstocks is dependent on lignocellulosic biomass degradation by hydrolytic enzymes. The main component of lignocellulose is cellulose and different types of organisms are able to secrete cellulases. The filamentous fungus Aspergillus nidulans serves as a model organism to study cellulase production and the available tools allow exploring more in depth the mechanisms governing cellulase production and carbon catabolite repression. RESULTS In A. nidulans, microarray data identified the cAMP-dependent protein kinase A (PkaA) as being involved in the transcriptional modulation and the production of lignocellulolytic enzymes in the presence of cellulose. Deletion of pkaA resulted in increased hydrolytic enzyme secretion, but reduced growth in the presence of lignocellulosic components and various other carbon sources. Furthermore, genes involved in fungal development were increased in the ΔpkaA strain, probably leading to the increased hyphal branching as was observed in this strain. This would allow the secretion of higher amounts of proteins. In addition, the expression of SynA, encoding a V-SNARE synaptobrevin protein involved in secretion, was increased in the ΔpkaA mutant. Deletion of pkaA also resulted in the reduced nuclear localization of the carbon catabolite repressor CreA in the presence of glucose and in partial de-repression when grown on cellulose. PkaA is involved in the glucose signaling pathway as the absence of this protein resulted in reduced glucose uptake and lower hexokinase/glucokinase activity, directing the cell to starvation conditions. Genome-wide transcriptomics showed that the expression of genes encoding proteins involved in fatty acid metabolism, mitochondrial function and in the use of cell storages was increased. CONCLUSIONS This study shows that PkaA is involved in hydrolytic enzyme production in A. nidulans. It appears that this protein kinase blocks the glucose pathway, hence forcing the cell to change to starvation conditions, increasing hydrolytic enzyme secretion and inducing the usage of cellular storages. This work uncovered new regulatory avenues governing the tight interplay between the metabolic states of the cell, which are important for the production of hydrolytic enzymes targeting lignocellulosic biomass. Deletion of pkaA resulted in a strain with increased hydrolytic enzyme secretion and reduced biomass formation.
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Affiliation(s)
- Leandro José de Assis
- />Departamento de Ciências Farmacêuticas, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Av. do Café S/N, CEP 14040-903, Ribeirão Preto, São Paulo, Brazil
| | - Laure Nicolas Annick Ries
- />Departamento de Ciências Farmacêuticas, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Av. do Café S/N, CEP 14040-903, Ribeirão Preto, São Paulo, Brazil
| | - Marcela Savoldi
- />Departamento de Ciências Farmacêuticas, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Av. do Café S/N, CEP 14040-903, Ribeirão Preto, São Paulo, Brazil
| | - Thaila Fernanda dos Reis
- />Departamento de Ciências Farmacêuticas, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Av. do Café S/N, CEP 14040-903, Ribeirão Preto, São Paulo, Brazil
| | - Neil Andrew Brown
- />Plant Biology and Crop Science, Rothamsted Research, Harpenden, Herts AL5 2JQ UK
| | - Gustavo Henrique Goldman
- />Departamento de Ciências Farmacêuticas, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Av. do Café S/N, CEP 14040-903, Ribeirão Preto, São Paulo, Brazil
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65
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Caraveo L, Medina H, Rodríguez-Buenfil I, Montalvo-Romero C, Evangelista-Martínez Z. A simple plate-assay for screening extracellular naringinase produced by streptomycetes. J Microbiol Methods 2014; 102:8-11. [PMID: 24742969 DOI: 10.1016/j.mimet.2014.04.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2014] [Revised: 04/04/2014] [Accepted: 04/06/2014] [Indexed: 10/25/2022]
Abstract
A simple plate-assay was developed with the purpose of detecting extracellular naringinase in streptomycetes. The naringin agar medium (NAM) was prepared by mixing carbon utilization medium (ISP9) and naringin. The clearing zones around colonies are correlated with the enzymatic activity. The assay validation was performed through the use of commercial naringinase (Penicillium decumbens).
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Affiliation(s)
- Leonela Caraveo
- Universidad Autónoma del Carmen, Ciudad del Carmen, Campeche México
| | - Héctor Medina
- Universidad Autónoma del Carmen, Ciudad del Carmen, Campeche México
| | - Ingrid Rodríguez-Buenfil
- Centro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco, A.C. (CIATEJ, A.C.) Unidad Sureste, Yucatán, México
| | | | - Zahaed Evangelista-Martínez
- Centro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco, A.C. (CIATEJ, A.C.) Unidad Sureste, Yucatán, México.
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Bontemps C, Toussaint M, Revol PV, Hotel L, Jeanbille M, Uroz S, Turpault MP, Blaudez D, Leblond P. Taxonomic and functional diversity of Streptomyces in a forest soil. FEMS Microbiol Lett 2013; 342:157-67. [PMID: 23489323 DOI: 10.1111/1574-6968.12126] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2013] [Accepted: 03/07/2013] [Indexed: 12/26/2022] Open
Abstract
In this work we report the isolation and the characterization of 79 Streptomyces isolates from a French forest soil. The 16S rRNA gene phylogeny indicated that a great diversity of Streptomyces was present in this soil, with at least nine different and potentially new species. Growth plate assays showed that most Streptomyces lineages exhibit cellulolytic and hemicellulolytic capacities and potentially participate in wood decomposition. Molecular screening for a specific hydrogenase also indicated a widespread potential for atmospheric H2 uptake. Co-culture experiments with representative strains showed antagonistic effects between Streptomyces of the same population and between Streptomyces and various fungi. Interestingly, in certain conditions, growth promotion of some fungi also occurred. We conclude that in forest soil, Streptomyces populations exhibit many important functions involved in different biogeochemical cycles and also influence the structure of soil microbial communities.
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Affiliation(s)
- Cyril Bontemps
- Dynamique des Génomes et Adaptation Microbienne, UMR1128, Université de Lorraine, Vandoeuvre-lès-Nancy F-54506, France.
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