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Abdeljalil S, Borgi I, Ben Hmad I, Frikha F, Verlaine O, Kerouaz B, Kchaou N, Ladjama A, Gargouri A. Large-scale analysis of the genome of the rare alkaline-halophilic Stachybotrys microspora reveals 46 cellulase genes. FEBS Open Bio 2023; 13:670-683. [PMID: 36748288 PMCID: PMC10068326 DOI: 10.1002/2211-5463.13573] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2022] [Revised: 02/01/2023] [Accepted: 02/06/2023] [Indexed: 02/08/2023] Open
Abstract
Fungi are of great importance in biotechnology, for example in the production of enzymes and metabolites. The main goal of this study was to obtain a high-coverage draft of the Stachybotrys microspora genome and to annotate and analyze the genome sequence data. The rare fungus S. microspora N1 strain is distinguished by its ability to grow in an alkaline halophilic environment and to efficiently secrete cellulolytic enzymes. Here we report the draft genome sequence composed of 3715 contigs, a genome size of 35 343 854 bp, with a GC content of 53.31% and a coverage around 20.5×. The identification of cellulolytic genes and of their corresponding functions was carried out through analysis and annotation of the whole genome sequence. Forty-six cellulases were identified using the fungicompanion bioinformatic tool. Interestingly, an S. microspora endoglucanase selected from those with a low isoelectric point was predicted to have a halophilic profile and share significant homology with a well-known bacterial halophilic cellulase. These results confirm previous biochemical studies revealing a halophilic character, which is a very rare feature among fungal cellulases. All these properties suggest that cellulases of S. microspora may have potential for use in the biofuel, textile, and detergent industries.
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Affiliation(s)
- Salma Abdeljalil
- Molecular Biotechnology of Eukaryotes Laboratory, Centre of Biotechnology of Sfax, University of Sfax, Tunisia
| | - Ines Borgi
- Molecular Biotechnology of Eukaryotes Laboratory, Centre of Biotechnology of Sfax, University of Sfax, Tunisia
| | - Ines Ben Hmad
- Molecular Biotechnology of Eukaryotes Laboratory, Centre of Biotechnology of Sfax, University of Sfax, Tunisia
| | - Fakher Frikha
- Laboratory of Molecular and Cellular Screening Processes, Center of Biotechnology of Sfax, University of Sfax, Tunisia
| | - Olivier Verlaine
- Bacterial Physiology and Genetic Institute, Centre for Protein Engineering, University of Liège, Belgium
| | - Bilal Kerouaz
- Laboratory of Applied Biochemistry and Microbiology, Department of Biochemistry, Faculty of Sciences, University Badji Mokhtar Annaba, Algeria
| | - Nesrine Kchaou
- Analytical Services Unit at the Center of Biotechnology of Sfax, Tunisia
| | - Ali Ladjama
- Laboratory of Applied Biochemistry and Microbiology, Department of Biochemistry, Faculty of Sciences, University Badji Mokhtar Annaba, Algeria
| | - Ali Gargouri
- Molecular Biotechnology of Eukaryotes Laboratory, Centre of Biotechnology of Sfax, University of Sfax, Tunisia
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Yadav K, Dwivedi S, Gupta S, Dubey AK, Singh VK, Tanveer A, Yadav S, Yadav D. Genome mining of Fusarium reveals structural and functional diversity of pectin lyases: a bioinformatics approach. 3 Biotech 2022; 12:261. [PMID: 36082361 PMCID: PMC9445148 DOI: 10.1007/s13205-022-03333-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Accepted: 08/25/2022] [Indexed: 11/26/2022] Open
Abstract
Pectin lyase (PNL) is an important enzyme of the pectinases group which degrades pectin polymer to 4,5-unsaturated oligogalacturonides by a unique β-elimination mechanism and is used in several industries. The existence of multigene families of pectin lyases has been investigated by mining microbial genomes. In the present study, 52 pectin lyase genes were predicted from sequenced six species of Fusarium, namely F. fujikuroi, F. graminearum, F. proliferatum, F. oxysporum, F. verticillioides and F. virguliforme. These sequences were in silico characterized for several physico-chemical, structural and functional attributes. The translated PNL proteins showed variability with 344-1142 amino acid residues, 35.44-127.41 kDa molecular weight, and pI ranging from 4.63 to 9.28. The aliphatic index ranged from 75.33 to 84.75. Multiple sequence alignment analysis showed several conserved amino acid residues and five distinct groups marked as I, II, III, IV, and V were observed in the phylogenetic tree. The Three-dimensional Structure of five of these PNLs, each representing a distinct group of phylogenetic trees was predicted using I-TASSER Server and validated. The pectin lyase proteins of Fusarium species revealed close similarity with pectin lyase of Aspergillus niger PelA(1IDJ) and PelB(1QCX). Diversity in the structural motifs was observed among Fusarium species with 2 β-sheets, 1 β-hairpin, 7-12 β bulges, 18-25 strands, 6 -11 helices, 1 helix-helix interaction, 32-49 β turns, 2-6 γ turns and 2- 3 disulfide bonds. The unique Pec_lyase domain was uniformly observed among all PNL proteins confirming its identity. The genome-wide mining of Fusarium species was attempted to provide the diversity of PNL genes, which could be explored for diverse applications after performing cloning and expression studies. Supplementary Information The online version contains supplementary material available at 10.1007/s13205-022-03333-w.
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Affiliation(s)
- Kanchan Yadav
- Department of Biotechnology, Deen Dayal Upadhyaya Gorakhpur University, Gorakhpur, Uttar Pradesh 273009 India
| | - Shruti Dwivedi
- Department of Biotechnology, Deen Dayal Upadhyaya Gorakhpur University, Gorakhpur, Uttar Pradesh 273009 India
| | - Supriya Gupta
- Department of Biotechnology, Deen Dayal Upadhyaya Gorakhpur University, Gorakhpur, Uttar Pradesh 273009 India
| | - Amit K. Dubey
- Department of Biotechnology, Deen Dayal Upadhyaya Gorakhpur University, Gorakhpur, Uttar Pradesh 273009 India
| | - Vinay K. Singh
- Centre for Bioinformatics, School of Biotechnology, Banaras Hindu University, Varanasi, Uttar Pradesh 221005 India
| | - Aiman Tanveer
- Department of Biotechnology, Deen Dayal Upadhyaya Gorakhpur University, Gorakhpur, Uttar Pradesh 273009 India
| | - Sangeeta Yadav
- Department of Biotechnology, Deen Dayal Upadhyaya Gorakhpur University, Gorakhpur, Uttar Pradesh 273009 India
| | - Dinesh Yadav
- Department of Biotechnology, Deen Dayal Upadhyaya Gorakhpur University, Gorakhpur, Uttar Pradesh 273009 India
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Mseddi J, Ben Farhat-Touzri D, Azzouz H. Selection and characterization of thermotolerant Beauveria bassiana isolates and with insecticidal activity against the cotton-melon aphid Aphis gossypii (Glover) (Hemiptera: Aphididae). PEST MANAGEMENT SCIENCE 2022; 78:2183-2195. [PMID: 35191162 DOI: 10.1002/ps.6844] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Revised: 01/07/2022] [Accepted: 02/22/2022] [Indexed: 06/14/2023]
Abstract
BACKGROUND Cotton-melon aphid Aphis gossypii (Glover) causes severe damage mainly to cucurbits. Twenty-two Beauveria sp. isolates were simultaneously assessed for their pathogenicity and heat tolerance. The selected isolates were identified molecularly and characterized in terms of conidial germination rate, mycelial growth, conidial yield and endophytic activity. RESULTS Screening bioassays showed that the B. bassiana isolates B3, B7, B9 and B12 were the most toxic, inducing mortality equal to or slightly higher than the commercialized strain B. bassiana BNat (70.7%). Median lethal concentration (LC50 ) bioassays revealed that only isolate B12 had a significantly lower LC50 value (5.4 × 105 conidia ml-1 ) than strain BNat (5 × 106 conidia ml-1 ). The heat tolerance screening test (1 h of exposure to 45°C) allowed us to select isolates B3, B7, B9 and B12 with germination rates of 57.5% to 80.1% after 24 h incubation at 25°C, all significantly higher than strain BNat (22.1%). The germination rates of all isolates decreased significantly after 2 h of exposure to 45°C, with the exception of isolate B12 which displayed the highest thermotolerance (72% germination). The four selected isolates were able to endophytically colonize cucumber leaves when applied to the foliage. Inoculation of cucumber plants with isolate B12 did not affect cucumber plant growth. However, several plant growth parameters were improved 5 weeks after root inoculation. CONCLUSION On the basis of its potent toxicity and thermotolerance, isolate B12 is a good candidate for further development as a biopesticide for use in integrated pest management strategies for aphid control. © 2022 Society of Chemical Industry.
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Affiliation(s)
- Jihen Mseddi
- Biopesticides Laboratory, Centre of Biotechnology of Sfax, Sfax University, Sfax, Tunisia
| | | | - Hichem Azzouz
- Biopesticides Laboratory, Centre of Biotechnology of Sfax, Sfax University, Sfax, Tunisia
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Trigui-Lahiani H, Abdeljalil S, Hadj Sassi A, Skouri-Gargouri H, Gargouri A. Molecular characterization and modeling study of the Podr1 gene and genome-scale identification of whole ATP-binding cassette (ABC) transporters in Penicillium occitanis. Genomics 2020; 113:795-811. [PMID: 33069827 DOI: 10.1016/j.ygeno.2020.10.011] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Revised: 06/23/2020] [Accepted: 10/13/2020] [Indexed: 11/26/2022]
Abstract
As a preliminary step to characterize genes encoding ATP-Binding-Cassette (ABC) proteins, we cloned a gene encoding an ABC transporter from P. occitanis using a PCR based approach followed by a genomic library screening and by additionally using whole genome sequencing results. The encoded protein has high similarity to the pleiotropic drug resistance protein subfamily members. Analysis of the cloned sequence revealed the presence of Walker A, Walker B and the ABC signature motifs at the nucleotide binding domains. Molecular docking resulted in predicting the most stable complex between the gene-encoding protein and cycloheximide. The southern blot results indicate that the gene is present as a single copy in the P. occitanis genome. The genome-scale identification of the PoABC superfamily members led to the characterization of 58 putative proteins divided into five subfamilies including: 12 ABCB, 24 ABCC, 1 ABCE, 5 ABCF, 15 ABCG, and of which 51 contain trans-membrane domains.
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Affiliation(s)
- Hèla Trigui-Lahiani
- Laboratory of Molecular Biotechnology of Eukaryotes, Centre of Biotechnology of Sfax, P.O. Box 1177, 3038 Sfax, University of Sfax, Tunisia.
| | - Salma Abdeljalil
- Laboratory of Molecular Biotechnology of Eukaryotes, Centre of Biotechnology of Sfax, P.O. Box 1177, 3038 Sfax, University of Sfax, Tunisia
| | - Azza Hadj Sassi
- Laboratory of Molecular Biotechnology of Eukaryotes, Centre of Biotechnology of Sfax, P.O. Box 1177, 3038 Sfax, University of Sfax, Tunisia
| | - Houda Skouri-Gargouri
- Laboratory of Molecular Biotechnology of Eukaryotes, Centre of Biotechnology of Sfax, P.O. Box 1177, 3038 Sfax, University of Sfax, Tunisia
| | - Ali Gargouri
- Laboratory of Molecular Biotechnology of Eukaryotes, Centre of Biotechnology of Sfax, P.O. Box 1177, 3038 Sfax, University of Sfax, Tunisia
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Abdeljalil S, Borgi I, Carvalho S, Jmal-Hammami L, Gargouri A. Molecular and bioinformatics analyses reveal two differentially expressed intracellular GH1 β-glucosidases from the rare alkalophilic fungus Stachybotrys microspora. Gene 2019; 703:134-144. [PMID: 30974199 PMCID: PMC6525110 DOI: 10.1016/j.gene.2019.04.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2018] [Revised: 03/06/2019] [Accepted: 04/02/2019] [Indexed: 01/25/2023]
Abstract
The present study reports the isolation and analysis of two novel GH1 β-glucosidases from the alkalophilic fungus Stachybotrys microspora, using PCR and Nested-PCR. Three major gene fragments were obtained by PCR: the first two are very similar and constitute a novel gene, which was named Smbgl1A, and the third PCR fragment is part of a different gene, named Smbgl1B. The truncated gene sequences were completely filled using the recent partial whole genome sequencing data of S. microspora (data not yet published). Moreover, we investigated the relative effects of glucose in comparison to cellulose rather than evaluate their absolute effects. In fact, RT-PCR analysis showed that while Smbgl1A was expressed when the fungus was grown in the presence of cellulose but not when grown with glucose, Smbgl1B was equally expressed under both conditions. The putative catalytic residues and the conserved glycone binding sites were identified. Zymogram analysis showed the intracellular production of β-glucosidases in S. microspora. The predicted secondary structure exhibited a classical (β/α)8 barrel fold, showing that both SmBGL1A and SmBGL1B belong to the GH1 family. Phylogenetic studies showed that SmBGL1A and SmBGL1B belong to the same branch as β-glucosidases from Stachybotrys chlorohalonata and Stachybotrys chartarum. However, SmBGL1A and SmBGL1B form two distinct clades. Isolation of two novel GH 1 β-glucosidases from Stachybotrys microspora Investigation of the relative effects of glucose in comparison to cellulose Zymogram analysis has shown the intracellular production of GH1 β-glucosidases. Prediction of the secondary structure with the presence of a classical (β/α) 8 barrel
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Affiliation(s)
- Salma Abdeljalil
- Laboratory of Molecular Biotechnology of Eucaryotes, Centre of Biotechnology of Sfax, Road of Sidi Mansour, B.O 1177, 3018, University of Sfax, Tunisia.
| | - Ines Borgi
- Laboratory of Molecular Biotechnology of Eucaryotes, Centre of Biotechnology of Sfax, Road of Sidi Mansour, B.O 1177, 3018, University of Sfax, Tunisia
| | - Sandra Carvalho
- Mode of Action Group, Wellcome Centre for Anti-Infectives Research, School of Life Sciences, University of Dundee, Dow Street, Dundee DD1 5EH, Scotland, UK
| | - Lamia Jmal-Hammami
- Laboratory of Molecular Biotechnology of Eucaryotes, Centre of Biotechnology of Sfax, Road of Sidi Mansour, B.O 1177, 3018, University of Sfax, Tunisia
| | - Ali Gargouri
- Laboratory of Molecular Biotechnology of Eucaryotes, Centre of Biotechnology of Sfax, Road of Sidi Mansour, B.O 1177, 3018, University of Sfax, Tunisia
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Atanasova L, Dubey M, Grujić M, Gudmundsson M, Lorenz C, Sandgren M, Kubicek CP, Jensen DF, Karlsson M. Evolution and functional characterization of pectate lyase PEL12, a member of a highly expanded Clonostachys rosea polysaccharide lyase 1 family. BMC Microbiol 2018; 18:178. [PMID: 30404596 PMCID: PMC6223089 DOI: 10.1186/s12866-018-1310-9] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2017] [Accepted: 10/10/2018] [Indexed: 11/29/2022] Open
Abstract
Background Pectin is one of the major and most complex plant cell wall components that needs to be overcome by microorganisms as part of their strategies for plant invasion or nutrition. Microbial pectinolytic enzymes therefore play a significant role for plant-associated microorganisms and for the decomposition and recycling of plant organic matter. Recently, comparative studies revealed significant gene copy number expansion of the polysaccharide lyase 1 (PL1) pectin/pectate lyase gene family in the Clonostachys rosea genome, while only low numbers were found in Trichoderma species. Both of these fungal genera are widely known for their ability to parasitize and kill other fungi (mycoparasitism) and certain species are thus used for biocontrol of plant pathogenic fungi. Results In order to understand the role of the high number of pectin degrading enzymes in Clonostachys, we studied diversity and evolution of the PL1 gene family in C. rosea compared with other Sordariomycetes with varying nutritional life styles. Out of 17 members of C. rosea PL1, we could only detect two to be secreted at acidic pH. One of them, the pectate lyase pel12 gene was found to be strongly induced by pectin and, to a lower degree, by polygalacturonic acid. Heterologous expression of the PEL12 in a PL1-free background of T. reesei revealed direct enzymatic involvement of this protein in utilization of pectin at pH 5 without a requirement for Ca2+. The mutants showed increased utilization of pectin compounds, but did not increase biocontrol ability in detached leaf assay against the plant pathogen Botrytis cinerea compared to the wild type. Conclusions In this study, we aimed to gain insight into diversity and evolution of the PL1 gene family in C. rosea and other Sordariomycete species in relation to their nutritional modes. We show that C. rosea PL1 expansion does not correlate with its mycoparasitic nutritional mode and resembles those of strong plant pathogenic fungi. We further investigated regulation, specificity and function of the C. rosea PEL12 and show that this enzyme is directly involved in degradation of pectin and pectin-related compounds, but not in C. rosea biocontrol. Electronic supplementary material The online version of this article (10.1186/s12866-018-1310-9) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Lea Atanasova
- Forest Mycology and Plant Pathology, Swedish University of Agricultural Sciences, P.O. Box 7026, SE-75007, Uppsala, Sweden. .,Research division of Biochemical Technology, Institute of Chemical, Environmental and Biological Engineering, Vienna University of Technology, Gumpendorferstrasse 1a, 1060, Vienna, Austria. .,Institute of Food Technology, University of Natural Resources and Life Sciences, Muthgasse 11, 1190, Vienna, Austria.
| | - Mukesh Dubey
- Forest Mycology and Plant Pathology, Swedish University of Agricultural Sciences, P.O. Box 7026, SE-75007, Uppsala, Sweden
| | - Marica Grujić
- Research division of Biochemical Technology, Institute of Chemical, Environmental and Biological Engineering, Vienna University of Technology, Gumpendorferstrasse 1a, 1060, Vienna, Austria
| | - Mikael Gudmundsson
- Molecular Sciences, Swedish University of Agricultural Sciences, P.O. Box 7015, SE-75007, Uppsala, Sweden
| | - Cindy Lorenz
- Institute of Food Technology, University of Natural Resources and Life Sciences, Muthgasse 11, 1190, Vienna, Austria
| | - Mats Sandgren
- Molecular Sciences, Swedish University of Agricultural Sciences, P.O. Box 7015, SE-75007, Uppsala, Sweden
| | - Christian P Kubicek
- Research division of Biochemical Technology, Institute of Chemical, Environmental and Biological Engineering, Vienna University of Technology, Gumpendorferstrasse 1a, 1060, Vienna, Austria.,, Present address: Steinschötelgasse 7, 1100, Vienna, Austria
| | - Dan Funck Jensen
- Forest Mycology and Plant Pathology, Swedish University of Agricultural Sciences, P.O. Box 7026, SE-75007, Uppsala, Sweden
| | - Magnus Karlsson
- Forest Mycology and Plant Pathology, Swedish University of Agricultural Sciences, P.O. Box 7026, SE-75007, Uppsala, Sweden
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Bravo-Ruiz G, Sassi AH, Marcet-Houben M, Di Pietro A, Gargouri A, Gabaldon T, Roncero MIG. Regulatory Mechanisms of a Highly Pectinolytic Mutant of Penicillium occitanis and Functional Analysis of a Candidate Gene in the Plant Pathogen Fusarium oxysporum. Front Microbiol 2017; 8:1627. [PMID: 28951729 PMCID: PMC5599776 DOI: 10.3389/fmicb.2017.01627] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2017] [Accepted: 08/10/2017] [Indexed: 11/24/2022] Open
Abstract
Penicillium occitanis is a model system for enzymatic regulation. A mutant strain exhibiting constitutive overproduction of different pectinolytic enzymes both under inducing (pectin) or repressing conditions (glucose) was previously isolated after chemical mutagenesis. In order to identify the molecular basis of this regulatory mechanism, the genomes of the wild type and the derived mutant strain were sequenced and compared, providing the first reference genome for this species. We used a phylogenomic approach to compare P. occitanis with other pectinolytic fungi and to trace expansions of gene families involved in carbohydrate degradation. Genome comparison between wild type and mutant identified seven mutations associated with predicted proteins. The most likely candidate was a mutation in a highly conserved serine residue of a conserved fungal protein containing a GAL4-like Zn2Cys6 binuclear cluster DNA-binding domain and a fungus-specific transcription factor regulatory middle homology region. To functionally characterize the role of this candidate gene, the mutation was recapitulated in the predicted orthologue Fusarium oxysporum, a vascular wilt pathogen which secretes a wide array of plant cell wall degrading enzymes, including polygalacturonases, pectate lyases, xylanases and proteases, all of which contribute to infection. However, neither the null mutant nor a mutant carrying the analogous point mutation exhibited a deregulation of pectinolytic enzymes. The availability, annotation and phylogenomic analysis of the P. occitanis genome sequence represents an important resource for understanding the evolution and biology of this species, and sets the basis for the discovery of new genes of biotechnological interest for the degradation of complex polysaccharides.
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Affiliation(s)
- Gustavo Bravo-Ruiz
- Departamento de Genetica, Universidad de Cordoba and Campus de Excelencia Agroalimentario (ceiA3)Cordoba, Spain
| | - Azza Hadj Sassi
- Bioinformatics and Genomics Programme, Centre for Genomic Regulation, The Barcelona Institute of Science and TechnologyBarcelona, Spain
| | - Marina Marcet-Houben
- Bioinformatics and Genomics Programme, Centre for Genomic Regulation, The Barcelona Institute of Science and TechnologyBarcelona, Spain
- Universitat Pompeu FabraBarcelona, Spain
| | - Antonio Di Pietro
- Departamento de Genetica, Universidad de Cordoba and Campus de Excelencia Agroalimentario (ceiA3)Cordoba, Spain
| | - Ali Gargouri
- Laboratoire de Biotechnologie Moléculaire des Eucaryotes, Centre de Biotechnologie de SfaxSfax, Tunisia
| | - Toni Gabaldon
- Bioinformatics and Genomics Programme, Centre for Genomic Regulation, The Barcelona Institute of Science and TechnologyBarcelona, Spain
- Universitat Pompeu FabraBarcelona, Spain
- Institucio Catalana de Recerca i Estudis AvançatsBarcelona, Spain
| | - M. Isabel G. Roncero
- Departamento de Genetica, Universidad de Cordoba and Campus de Excelencia Agroalimentario (ceiA3)Cordoba, Spain
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Hadj Sassi A, Trigui-Lahiani H, Abdeljalil S, Gargouri A. Enhancement of solubility, purification and inclusion-bodies-refolding of an active pectin lyase from Penicillium occitanis expressed in Escherichia coli. Int J Biol Macromol 2016; 95:256-262. [PMID: 27845226 DOI: 10.1016/j.ijbiomac.2016.11.036] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Revised: 09/12/2016] [Accepted: 11/10/2016] [Indexed: 10/20/2022]
Abstract
Pectin lyase (pnl) is the only pectinase able to hydrolyze directly the highly methylated pectin without liberating the toxic methanol and without disturbing ester content responsible for specific aroma of juices. The cDNA of Penicillium occitanis pnl (mature form) was cloned into pET-21a as expression vector and over-expressed into Esherichia coli. Most of recombinant pnl was expressed as inclusion bodies. Pnl activity was confirmed by colorimetric assay. To enhance the solubility yield of the expressed pnl, the effects of induction temperature, host strain and expression level were optimized. Maximal production of functional pnl was obtained after induction by 0.4mM IPTG at 30°C and 150rpm for 16h. Interestingly, the use of Origami host strain, having an oxidized cytoplasm favoring disulfide bonds formation required for the active conformation of the enzyme, has significantly improved the yield of the soluble active form of recombinant pnl. This pnl was successfully purified through a single step purification using His-Trap affinity column chromatography. This work is the first to report pnl expression into Origami strain. Alternatively, the inclusion bodies were isolated, denatured by high concentration of urea and gradually refolded by successive dialysis, leading to their transformation into soluble and active form.
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Affiliation(s)
- Azza Hadj Sassi
- Laboratoire de Biotechnologie Moléculaire des Eucaryotes, Centre de Biotechnologie de Sfax, PB1177, University of Sfax, Tunisia
| | - Hèla Trigui-Lahiani
- Laboratoire de Biotechnologie Moléculaire des Eucaryotes, Centre de Biotechnologie de Sfax, PB1177, University of Sfax, Tunisia
| | - Salma Abdeljalil
- Laboratoire de Biotechnologie Moléculaire des Eucaryotes, Centre de Biotechnologie de Sfax, PB1177, University of Sfax, Tunisia
| | - Ali Gargouri
- Laboratoire de Biotechnologie Moléculaire des Eucaryotes, Centre de Biotechnologie de Sfax, PB1177, University of Sfax, Tunisia.
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Mallek-Fakhfakh H, Fakhfakh J, Masmoudi N, Rezgui F, Gargouri A, Belghith H. Agricultural wastes as substrates for β-glucosidase production by Talaromyces thermophilus: Role of these enzymes in enhancing waste paper saccharification. Prep Biochem Biotechnol 2016; 47:414-423. [PMID: 27824279 DOI: 10.1080/10826068.2016.1252928] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
In the present study, we investigated a potent extracellular β-glucosidases secreted by the thermophilic fungal strain AX4 of Talaromyces thermophilus, isolated from Tunisian soil samples. This strain was selected referring to the highest thermostability of its β-glucosidases compared to the other fungal isolates. The β-glucosidase production was investigated by submerged fermentation. The optimal temperature and initial pH for maximum β-glucosidase production were 50°C and 7.0, respectively. Several carbon sources were assayed for their effects on β-glucosidase production, significant yields were obtained in media containing lactose 1% (3.0 ± 0.36 U/ml) and wheat bran 2% (4.0 ± 0.4 U/ml). The combination of wheat bran at 2% and lactose at 0.8% as carbon source enhanced β-glucosidase production, which reached 8.5 ± 0.28 U/ml. Furthermore, the β-glucosidase-rich enzymatic juice of T. thermophilus exhibited significant synergism with Trichoderma reesei (Rut C30) cellulases for pretreated waste paper (PWP) hydrolysis. Interestingly, the use of this optimal enzymatic cocktail increased 4.23 fold the glucose yield after saccharification of waste paper. A maximum sugar yield (94%) was reached when using low substrate (2%) and enzyme loading (EC1).
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Affiliation(s)
- Hanen Mallek-Fakhfakh
- a Laboratory of Eukaryotes Molecular Biotechnology, Center of Biotechnology of Sfax , University of Sfax , Sfax , Tunisia
| | - Jawhar Fakhfakh
- b Laboratory of Chemistry of Natural Substances, Faculty of Sciences of Sfax , University of Sfax , Sfax , Tunisia
| | - Najla Masmoudi
- a Laboratory of Eukaryotes Molecular Biotechnology, Center of Biotechnology of Sfax , University of Sfax , Sfax , Tunisia
| | - Fatma Rezgui
- a Laboratory of Eukaryotes Molecular Biotechnology, Center of Biotechnology of Sfax , University of Sfax , Sfax , Tunisia
| | - Ali Gargouri
- a Laboratory of Eukaryotes Molecular Biotechnology, Center of Biotechnology of Sfax , University of Sfax , Sfax , Tunisia
| | - Hafedh Belghith
- a Laboratory of Eukaryotes Molecular Biotechnology, Center of Biotechnology of Sfax , University of Sfax , Sfax , Tunisia
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Cloning and Genomic Organization of a Rhamnogalacturonase Gene from Locally Isolated Strain of Aspergillus niger. Appl Biochem Biotechnol 2015; 176:2314-27. [PMID: 26142900 DOI: 10.1007/s12010-015-1720-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2015] [Accepted: 06/17/2015] [Indexed: 10/23/2022]
Abstract
The rhg gene encoding a rhamnogalacturonase was isolated from the novel strain A1 of Aspergillus niger. It consists of an ORF of 1.505 kb encoding a putative protein of 446 amino acids with a predicted molecular mass of 47 kDa, belonging to the family 28 of glycosyl hydrolases. The nature and position of amino acids comprising the active site as well as the three-dimensional structure were well conserved between the A. niger CTM10548 and fungal rhamnogalacturonases. The coding region of the rhg gene is interrupted by three short introns of 56 (introns 1 and 3) and 52 (intron 2) bp in length. The comparison of the peptide sequence with A. niger rhg sequences revealed that the A1 rhg should be an endo-rhamnogalacturonases, more homologous to rhg A than rhg B A. niger known enzymes. The comparison of rhg nucleotide sequence from A. niger A1 with rhg A from A. niger shows several base changes. Most of these changes (59 %) are located at the third base of codons suggesting maintaining the same enzyme function. We used the rhamnogalacturonase A from Aspergillus aculeatus as a template to build a structural model of rhg A1 that adopted a right-handed parallel β-helix.
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Sandri IG, Fontana RC, Moura da Silveira M. Influence of pH and temperature on the production of polygalacturonases by Aspergillus fumigatus. Lebensm Wiss Technol 2015. [DOI: 10.1016/j.lwt.2014.12.004] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Xu S, Qin X, Liu B, Zhang D, Zhang W, Wu K, Zhang Y. An acidic pectin lyase from
Aspergillus niger
with favourable efficiency in fruit juice clarification. Lett Appl Microbiol 2014; 60:181-187. [DOI: 10.1111/lam.12357] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2014] [Revised: 10/29/2014] [Accepted: 10/29/2014] [Indexed: 11/29/2022]
Affiliation(s)
- S.X. Xu
- College of Life Sciences Henan Agricultural University Zhengzhou China
| | - X. Qin
- College of Life Sciences Henan Agricultural University Zhengzhou China
- Biotechnology Research Institute Chinese Academy of Agricultural Sciences Beijing China
| | - B. Liu
- Biotechnology Research Institute Chinese Academy of Agricultural Sciences Beijing China
| | - D.Q. Zhang
- Biotechnology Research Institute Chinese Academy of Agricultural Sciences Beijing China
| | - W. Zhang
- Biotechnology Research Institute Chinese Academy of Agricultural Sciences Beijing China
| | - K. Wu
- College of Life Sciences Henan Agricultural University Zhengzhou China
| | - Y.H. Zhang
- Biotechnology Research Institute Chinese Academy of Agricultural Sciences Beijing China
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Heterologous expression of a Penicillium purpurogenum pectin lyase in Pichia pastoris and its characterization. Fungal Biol 2014; 118:507-15. [DOI: 10.1016/j.funbio.2014.04.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2014] [Revised: 03/11/2014] [Accepted: 04/02/2014] [Indexed: 11/20/2022]
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Damak N, Abdeljalil S, Koubaa A, Trigui S, Ayadi M, Trigui-Lahiani H, Kallel E, Turki N, Djemal L, Belghith H, Taieb NH, Gargouri A. Cloning and heterologous expression of a thermostable pectate lyase from Penicillium occitanis in Escherichia coli. Int J Biol Macromol 2013; 62:549-56. [PMID: 24141072 DOI: 10.1016/j.ijbiomac.2013.10.013] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2013] [Revised: 10/11/2013] [Accepted: 10/11/2013] [Indexed: 10/26/2022]
Abstract
The entire pectate lyase cDNA (Pel1) of Penicillium occitanis was cloned from a cDNA bank and sequenced. The ORF exhibited a great homology to Penicillium marneffei and conservation of all features of fungal pectate lyases such as the barrel structure with "eight right-handed parallel β-helix" architecture. The structure modeling also showed the interesting resemblance with thermostable pectate lyases since several specific residues were also shared by Pel1 and these thermostable enzymes. Having shown that the enzyme retains its activity after endoH-mediated deglycosylation, we investigated its expression in Escherichia coli BL21 using the pET28-a vector. This expression was shown to be optimum when cells were induced at room temperature in 2YT medium rather than at 37 °C and LB medium. In such conditions, the recombinant protein was apparently produced more in soluble form than as inclusion bodies. The effect of NaCl concentration was investigated during the binding and elution steps of recombinant His-tagged enzyme on MagneHis Ni-particles. The purified enzyme was shown to retain its thermo-activity as well as a great tolerance to high concentration of NaCl and imidazole.
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Affiliation(s)
- Naourez Damak
- Laboratoire de Valorisation de la Biomasse et Production des Protéines chez les Eucaryotes, Centre de Biotechnologie de Sfax, Route Sidi Mansour Km 6, PO Box 1177, 3018 Sfax, Tunisia; University of Sfax, Tunisia
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Abdeljalil S, Trigui-Lahiani H, Lazzez H, Gargouri A. Cloning, molecular characterization, and mRNA expression of the thermostable family 3 β-glucosidase from the rare fungus Stachybotrys microspora. Mol Biotechnol 2012; 54:842-52. [PMID: 23242634 DOI: 10.1007/s12033-012-9633-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
The filamentous fungus Stachybotrys microspora possess a rich β-glucosidase system composed of five β-glucosidases. Three of them were already purified to homogeneity and characterized. In order to isolate the β-glucosidase genes from S. microspora and study their regulation, a PCR strategy using consensus primers was used as a first step. This approach enabled the isolation of three different fragments of family 3 β-glucosidase gene. A representative genomic library was constructed and probed with one amplified fragment gene belonging to family 3 of β-glucosidase. After two rounds of hybridization, seven clones were obtained and the analysis of DNA plasmids leads to the isolation of one clone (CF3) with the largest insert of 7 kb. The regulatory region shows multiple TC-rich elements characteristic of constitutive promoter, explaining the expression of this gene under glucose condition, as shown by zymogram and RT-PCR analysis. The tertiary structure of the deduced amino acid sequence of Smbgl3 was predicted and has shown three conserved domains: an (α/β)8 triose phosphate isomerase (TIM) barrel, (α/β)5 sandwich, and fibronectin type III domain involved in protein thermostability. Zymogram analysis highlighted such thermostable character of this novel β-glucosidase.
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Affiliation(s)
- Salma Abdeljalil
- Laboratoire de Valorisation de la Biomasse et Production de Protéines chez les Eucaryotes, Centre de Biotechnologie de Sfax, University of Sfax, Route Sidi Mansour, BP 1177, 3018 Sfax, Tunisia.
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The Constitutive Production of Pectinase by the CT1 Mutant of Penicillium Occitainis is Modulated by pH. Appl Biochem Biotechnol 2012. [DOI: 10.1007/s12010-012-9971-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Cao J. The pectin lyases in Arabidopsis thaliana: evolution, selection and expression profiles. PLoS One 2012; 7:e46944. [PMID: 23056537 PMCID: PMC3467278 DOI: 10.1371/journal.pone.0046944] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2012] [Accepted: 09/06/2012] [Indexed: 11/22/2022] Open
Abstract
Pectin lyases are a group of enzymes that are thought to contribute to many biological processes, such as the degradation of pectin. However, until this study, no comprehensive study incorporating phylogeny, chromosomal location, gene duplication, gene organization, functional divergence, adaptive evolution, expression profiling and functional networks has been reported for Arabidopsis. Sixty-seven pectin lyase genes have been identified, and most of them possess signal sequences targeting the secretory pathway. Phylogenetic analyses identified five gene groups with considerable conservation among groups. Pectin lyase genes were non-randomly distributed across chromosomes and clustering was evident. Functional divergence and adaptive evolution analyses suggested that purifying selection was the main force driving pectin lyase evolution, although some critical sites responsible for functional divergence might be the consequence of positive selection. A stigma- and receptacle-specific expression promoter was identified, and it had increased expression in response to wounding. Two hundred and eighty-eight interactions were identified by functional network analyses, and most of these were involved in cellular metabolism, cellular transport and localization, and stimulus responses. This investigation contributes to an improved understanding of the complexity of the Arabidopsis pectin lyase gene family.
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Affiliation(s)
- Jun Cao
- Institute of Life Science, Jiangsu University, Zhenjiang, Jiangsu, P.R. China.
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Yuan P, Meng K, Shi P, Luo H, Huang H, Tu T, Yang P, Yao B. An alkaline-active and alkali-stable pectate lyase from Streptomyces sp. S27 with potential in textile industry. ACTA ACUST UNITED AC 2012; 39:909-15. [DOI: 10.1007/s10295-012-1085-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2011] [Accepted: 01/04/2012] [Indexed: 10/14/2022]
Abstract
Abstract
A pectate lyase gene (pl-str) was cloned from Streptomyces sp. S27 and expressed in Escherichia coli Rosetta. The full-length pl-str consists of 972 bp and encodes for a protein of 323 amino acids without signal peptide that belongs to family PF00544. The recombinant enzyme (r-PL-STR) was purified to electrophoretic homogeneity using Ni2+–NTA chromatography and showed apparent molecular mass of ~35 kDa. The pH optimum of r-PL-STR was found to be 10.0, and it exhibited >70% of the maximal activity at pH 12.0. After incubation at 37°C for 1 h without substrate, the enzyme retained more than 55% activity at pH 7.0–12.0. Compared with the commercial complex enzyme Scourzyme@301L from Novozymes, purified r-PL-STR showed similar efficacy in reducing the intrinsic viscosity of polygalacturonic acid (49.0 vs. 49.7%). When combined with cellulase and α-amylase, r-PL-STR had comparable performance in bioscouring of jute fabric (22.39 vs. 22.99%). Thus, r-PL-STR might represent a good candidate for use in alkaline industries such as textile.
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Affiliation(s)
- Peng Yuan
- grid.410727.7 0000000105261937 Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute Chinese Academy of Agricultural Sciences No. 12 Zhongguancun South Street 100081 Beijing People’s Republic of China
| | - Kun Meng
- grid.410727.7 0000000105261937 Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute Chinese Academy of Agricultural Sciences No. 12 Zhongguancun South Street 100081 Beijing People’s Republic of China
| | - Pengjun Shi
- grid.410727.7 0000000105261937 Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute Chinese Academy of Agricultural Sciences No. 12 Zhongguancun South Street 100081 Beijing People’s Republic of China
| | - Huiying Luo
- grid.410727.7 0000000105261937 Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute Chinese Academy of Agricultural Sciences No. 12 Zhongguancun South Street 100081 Beijing People’s Republic of China
| | - Huoqing Huang
- grid.410727.7 0000000105261937 Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute Chinese Academy of Agricultural Sciences No. 12 Zhongguancun South Street 100081 Beijing People’s Republic of China
| | - Tao Tu
- grid.410727.7 0000000105261937 Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute Chinese Academy of Agricultural Sciences No. 12 Zhongguancun South Street 100081 Beijing People’s Republic of China
| | - Peilong Yang
- grid.410727.7 0000000105261937 Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute Chinese Academy of Agricultural Sciences No. 12 Zhongguancun South Street 100081 Beijing People’s Republic of China
| | - Bin Yao
- grid.410727.7 0000000105261937 Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute Chinese Academy of Agricultural Sciences No. 12 Zhongguancun South Street 100081 Beijing People’s Republic of China
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Gene cloning and molecular characterization of the Talaromyces thermophilus lipase Catalyzed efficient hydrolysis and synthesis of esters. Gene 2012; 494:112-8. [DOI: 10.1016/j.gene.2011.11.059] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2011] [Revised: 10/04/2011] [Accepted: 11/22/2011] [Indexed: 10/14/2022]
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Lara-Márquez A, Zavala-Páramo MG, López-Romero E, Calderón-Cortés N, López-Gómez R, Conejo-Saucedo U, Cano-Camacho H. Cloning and characterization of a pectin lyase gene from Colletotrichum lindemuthianum and comparative phylogenetic/structural analyses with genes from phytopathogenic and saprophytic/opportunistic microorganisms. BMC Microbiol 2011; 11:260. [PMID: 22151976 PMCID: PMC3271051 DOI: 10.1186/1471-2180-11-260] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2011] [Accepted: 12/09/2011] [Indexed: 11/10/2022] Open
Abstract
Background Microorganisms produce cell-wall-degrading enzymes as part of their strategies for plant invasion/nutrition. Among these, pectin lyases (PNLs) catalyze the depolymerization of esterified pectin by a β-elimination mechanism. PNLs are grouped together with pectate lyases (PL) in Family 1 of the polysaccharide lyases, as they share a conserved structure in a parallel β-helix. The best-characterized fungal pectin lyases are obtained from saprophytic/opportunistic fungi in the genera Aspergillus and Penicillium and from some pathogens such as Colletotrichum gloeosporioides. The organism used in the present study, Colletotrichum lindemuthianum, is a phytopathogenic fungus that can be subdivided into different physiological races with different capacities to infect its host, Phaseolus vulgaris. These include the non-pathogenic and pathogenic strains known as races 0 and 1472, respectively. Results Here we report the isolation and sequence analysis of the Clpnl2 gene, which encodes the pectin lyase 2 of C. lindemuthianum, and its expression in pathogenic and non-pathogenic races of C. lindemuthianum grown on different carbon sources. In addition, we performed a phylogenetic analysis of the deduced amino acid sequence of Clpnl2 based on reported sequences of PNLs from other sources and compared the three-dimensional structure of Clpnl2, as predicted by homology modeling, with those of other organisms. Both analyses revealed an early separation of bacterial pectin lyases from those found in fungi and oomycetes. Furthermore, two groups could be distinguished among the enzymes from fungi and oomycetes: one comprising enzymes from mostly saprophytic/opportunistic fungi and the other formed mainly by enzymes from pathogenic fungi and oomycetes. Clpnl2 was found in the latter group and was grouped together with the pectin lyase from C. gloeosporioides. Conclusions The Clpnl2 gene of C. lindemuthianum shares the characteristic elements of genes coding for pectin lyases. A time-course analysis revealed significant differences between the two fungal races in terms of the expression of Clpnl2 encoding for pectin lyase 2. According to the results, pectin lyases from bacteria and fungi separated early during evolution. Likewise, the enzymes from fungi and oomycetes diverged in accordance with their differing lifestyles. It is possible that the diversity and nature of the assimilatory carbon substrates processed by these organisms played a determinant role in this phenomenon.
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Affiliation(s)
- Alicia Lara-Márquez
- Centro Multidisciplinario de Estudios en Biotecnología, Universidad Michoacana de San Nicolás de Hidalgo, Km 9.5 Carretera Morelia-Zinapécuaro, Posta Veterinaria, Tarímbaro, C.P. 58000, Michoacán, México
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Teixeira JA, Gonçalves DB, de Queiroz MV, de Araújo EF. Improved pectinase production in Penicillium griseoroseum recombinant strains. J Appl Microbiol 2011; 111:818-25. [PMID: 21726361 DOI: 10.1111/j.1365-2672.2011.05099.x] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
AIMS To obtain recombinant strains of Penicillium griseoroseum that produce high levels of pectin lyase (PL) and polygalacturonase (PG) simultaneously. METHODS AND RESULTS A strain with high production of PL was transformed with the plasmid pAN52pgg2, containing the gene encoding PG of P. griseoroseum, under control of the gpd promoter gene from Aspergillus nidulans. Southern blot analysis demonstrated that all strain had at least one copy of pAN52pgg2 integrated into the genome. The recombinant strain P. griseoroseum T20 produced levels of PL and PG that were 266- and 27-fold greater, respectively, than the wild-type strain. Furthermore, the extracellular protein profile of recombinant T20 showed two protein bands of c. 36 and 38 kDa, associated with PL and PG, respectively. CONCLUSIONS This recombinant strain T20 produces PL and PG using carbon sources of low costs, and an enzyme preparation that is free of cellulolytic and proteolytic activities. SIGNIFICANCE AND IMPACT OF THE STUDY PL and PG play an important role in the degradation of pectin. Owing to their use in the juice and wines industries, there is a growing interest in the inexpensive production of these enzymes. This work describes an efficient system of protein expression and secretion using the fungus P. griseoroseum.
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Affiliation(s)
- J A Teixeira
- Departamento de Microbiologia/BIOAGRO, Universidade Federal de Viçosa, Viçosa-MG, Brazil
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Ayadi M, Trigui S, Trigui-Lahiani H, Hadj-Taïeb N, Jaoua M, Gargouri A. Constitutive over-expression of pectinases in Penicillium occitanis CT1 mutant is transcriptionally regulated. Biotechnol Lett 2011; 33:1139-44. [DOI: 10.1007/s10529-011-0546-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2010] [Accepted: 01/21/2011] [Indexed: 11/25/2022]
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Molecular cloning, gene expression analysis and structural modelling of the cellobiohydrolase I from Penicillium occitanis. Enzyme Microb Technol 2010. [DOI: 10.1016/j.enzmictec.2009.10.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Skouri-Gargouri H, Ben Ali M, Gargouri A. Molecular cloning, structural analysis and modelling of the AcAFP antifungal peptide from Aspergillus clavatus. Peptides 2009; 30:1798-804. [PMID: 19591888 DOI: 10.1016/j.peptides.2009.06.034] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/18/2009] [Revised: 06/25/2009] [Accepted: 06/26/2009] [Indexed: 11/17/2022]
Abstract
An abundantly secreted thermostable peptide (designed AcAFP) with a molecular mass of 5777 Da was isolated and purified in a previous work from a local strain of A. clavatus (VR1). Based on the N-terminal amino acid (aa) sequence of the AcAFP peptide, an oligonucleotide probe was derived and allowed the amplification of the encoding cDNA by RT-PCR. This cDNA fragment encodes a pre-pro-protein of 94 aa which appears to be processed to a mature product of 51 aa cys-rich protein. The deduced aa sequence of the pre-pro-sequence reveals high similarity with ascomycetes antifungal peptide. Comparison of the nucleotide sequence of the genomic fragment and the cDNA clone revealed the presence of an open reading frame of 282 bp interrupted by two small introns of 89 and 56 bp with conserved splice site. The three-dimensional (3D) structure modeling of AcAFP exhibits a compact structure consisting of five anti-parallel beta barrel stabilized by four internal disulfide bridges. The folding pattern revealed also a cationic site and spatially adjacent hydrophobic stretch. The antifungal mechanism was investigated by transmission and confocal microscopy. AcAFP cause cell wall altering in a dose-dependent manner against the phytopathogenic fungus Fusarium oxysporum.
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Affiliation(s)
- Houda Skouri-Gargouri
- Laboratoire de Génétique Moléculaire des Eucaryotes, Centre de Biotechnologie de Sfax, Route Sidi Mansour, BP K 3038-Sfax, Tunisia
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Trigui-Lahiani HÃ, Ayadi M, Hadj-Taïeb N, Ali MB, Gargouri A. Genomic organization of a polygalacturonase gene from a hyperpectinolytic mutant strain of Penicillium occitanis. FEMS Microbiol Lett 2008; 281:23-9. [DOI: 10.1111/j.1574-6968.2008.01071.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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