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Singh RS, Thakur SR, Kennedy JF. Purification and characterisation of a xylose-specific mitogenic lectin from Fusarium sambucinum. Int J Biol Macromol 2020; 152:393-402. [PMID: 32084487 DOI: 10.1016/j.ijbiomac.2020.02.188] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Revised: 02/17/2020] [Accepted: 02/17/2020] [Indexed: 02/07/2023]
Abstract
A xylose-specific intracellular lectin, showing hemagglutination only with rabbit erythrocytes was purified from mycelium of Fusarium sambucinum which was designated as FSL. An array of anion exchange chromatography on Q-Sepharose and gel-exclusion chromatography on Sephadex G-100 resulted in 84.21% yield and 53.99-fold purification of lectin with specific activity of 169.53 titre/mg. Molecular weight of FSL determined by SDS-PAGE was 70.7 kDa, which was further confirmed by gel-exclusion chromatography. Native-PAGE analysis of FSL showed its monomeric nature. FSL was observed to be a glycoprotein containing 2.9% carbohydrate. Hapten inhibition profile of FSL displayed its strong affinity towards D-xylose (MIC 1.562 mM), L-fucose (MIC 6.25 mM), D-mannose (MIC 3.125 mM), fetuin (MIC 15.62 μg/mL), asialofetuin (MIC 125 μg/mL) and BSM (MIC 3.125 μg/mL). Affinity of FSL towards xylose is rare. FSL was found stable over a pH range 6.0-7.5 and upto 40 °C temperature. Hemagglutination activity of FSL remained unaffected by divalent ions. Lectin concentration of 5 μg/mL was found sufficient to stimulate proliferation of murine spleen cells and its concentration 75 μg/mL exhibited highest mitogenic potential. FSL exhibited maximum mitogenic stimulatory index of 14.35. The purification, characterisation and mitogenicity of F. sambucinum lectin has been reported first time.
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Affiliation(s)
- Ram Sarup Singh
- Carbohydrate and Protein Biotechnology Laboratory, Department of Biotechnology, Punjabi University, 147 002 Patiala, India.
| | - Shivani Rani Thakur
- Carbohydrate and Protein Biotechnology Laboratory, Department of Biotechnology, Punjabi University, 147 002 Patiala, India
| | - John F Kennedy
- Chembiotech Laboratories Ltd, WR15 8SG Tenbury Wells, United Kingdom
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Singh RS, Walia AK. Purification of a potent mitogenic homodimeric Penicillium griseoroseum lectin and its characterisation. J Basic Microbiol 2019; 59:1238-1247. [PMID: 31613018 DOI: 10.1002/jobm.201900428] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2019] [Revised: 09/14/2019] [Accepted: 09/29/2019] [Indexed: 11/08/2022]
Abstract
Penicillium griseoroseum lectin was 80-fold purified by successive DEAE Sepharose anion exchange and Sephadex G-100 gel permeation chromatography. P. griseoroseum lectin exhibited haemagglutination activity towards protease-treated rabbit erythrocytes. It showed specificity towards various carbohydrates such as d-mannose, N-acetyl-d-glucosamine, mucins, and so forth. P. griseoroseum lectin was found as a glycoprotein with glycan content of 4.33%. Purified P. griseoroseum lectin is homodimeric having a molecular mass of 57 kDa with subunit molecular mass of 28.6 kDa. Haemagglutination activity of purified P. griseoroseum lectin was completely stable from 25°C to 35°C at a pH range of 6-7.5. Lectin activity was not influenced by divalent metal ions and denaturants. P. griseoroseum lectin manifested mitogenicity towards mice splenocytes and activity reached a peak at 75 μg/ml of lectin concentration. P. griseoroseum lectin in microgram concentrations stimulated proliferation of mice splenocytes. Thus, P. griseoroseum lectin exhibits potential mitogenicity, which can be exploited for further biomedical applications.
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Affiliation(s)
- Ram S Singh
- Carbohydrate and Protein Biotechnology Laboratory, Department of Biotechnology, Punjabi University, Patiala, India
| | - Amandeep K Walia
- Carbohydrate and Protein Biotechnology Laboratory, Department of Biotechnology, Punjabi University, Patiala, India
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Singh RS, Walia AK, Kennedy JF. Structural aspects and biomedical applications of microfungal lectins. Int J Biol Macromol 2019; 134:1097-1107. [DOI: 10.1016/j.ijbiomac.2019.05.093] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2019] [Revised: 05/15/2019] [Accepted: 05/15/2019] [Indexed: 11/17/2022]
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An L-fucose specific lectin from Aspergillus niger isolated from mycotic keratitis patient and its interaction with human pancreatic adenocarcinoma PANC-1 cells. Int J Biol Macromol 2019; 134:487-497. [DOI: 10.1016/j.ijbiomac.2019.04.192] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2019] [Revised: 04/29/2019] [Accepted: 04/29/2019] [Indexed: 11/21/2022]
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Sakai K, Hiemori K, Tateno H, Hirabayashi J, Gonoi T. Fucose-specific lectin of Aspergillus fumigatus: binding properties and effects on immune response stimulation. Med Mycol 2019; 57:71-83. [PMID: 29370403 DOI: 10.1093/mmy/myx163] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2017] [Accepted: 12/20/2017] [Indexed: 12/15/2022] Open
Abstract
Aspergillus fumigatus is the major causative fungus of aspergillosis, and many studies have explored the relationship between A. fumigatus and pathogenicity. In the current study, we focused on a fucose-specific lectin, FleA, as a novel molecule which related to the pathogenicity of A. fumigatus. The disruption of the fleA gene did not lead to clear morphological changes compared to parental strain under several stress conditions in culture, but germination become earlier. In comparison with parental strain, the pathogenicity of disruptant was enhanced in a mouse infection model. The pattern of conidial phagocytosis and adhesion to cultured cells did not explain this enhanced pathogenicity. FleA was reported to contain six conserved fucose-binding sites; the analysis of constructed FleA point mutants revealed nonequivalent contribution of the fucose-binding sites to fucose binding. Based on the immune response induced in the cultured cells upon exposure to wild-type and mutant FleA, we propose a model of the FleA molecule in A. fumigatus infection.
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Affiliation(s)
- Kanae Sakai
- Medical Mycology Research Center, Chiba University, Japan
| | - Keiko Hiemori
- Department of Life Science and Biotechnology, Biotechnology Research Institute for Drug Discovery, AIST, Japan
| | - Hiroaki Tateno
- Department of Life Science and Biotechnology, Biotechnology Research Institute for Drug Discovery, AIST, Japan
| | - Jun Hirabayashi
- Department of Life Science and Biotechnology, Biotechnology Research Institute for Drug Discovery, AIST, Japan
| | - Tohru Gonoi
- Medical Mycology Research Center, Chiba University, Japan
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Purification and characterization of a heterodimeric mycelial lectin from Penicillium proteolyticum with potent mitogenic activity. Int J Biol Macromol 2019; 128:124-131. [DOI: 10.1016/j.ijbiomac.2019.01.103] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2019] [Revised: 01/18/2019] [Accepted: 01/18/2019] [Indexed: 12/17/2022]
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Singh RS, Walia AK, Kennedy JF. Purification and characterization of a mitogenic lectin from Penicillium duclauxii. Int J Biol Macromol 2018; 116:426-433. [DOI: 10.1016/j.ijbiomac.2018.05.016] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2018] [Revised: 05/03/2018] [Accepted: 05/03/2018] [Indexed: 02/03/2023]
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Ghufran MS, Ghosh K, Kanade SR. A fucose specific lectin from Aspergillus flavus induced interleukin-8 expression is mediated by mitogen activated protein kinase p38. Med Mycol 2017; 55:323-333. [PMID: 27664169 DOI: 10.1093/mmy/myw066] [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: 02/10/2016] [Accepted: 07/08/2016] [Indexed: 12/28/2022] Open
Abstract
Aspergillus flavus is an ubiquitous, opportunistic fungus responsible to cause invasive fungal allergic diseases, including bronchopulmonary invasive aspergillosis in persons with altered immune function. Lectins have been implicated as interaction mediators between the pathogenic fungi and human host. We isolated L-fucose specific lectin from A. flavus (FFL) and purified it to homogeneity with a combination of ion exchange and hydrophobic interaction chromatography methods. Its hemagglutination activity was significantly inhibited by 125 μM L-fucose as compared to other sugars and sugar derivatives. We, then used human cell line L-132, and U937 cell line to explore the possible cytotoxicity and proinflammatory effect of this fucose-specific lectin. The lectin induced the expression of proinflammatory cytokine interleukin-8 (IL-8) in a dose-dependent manner, and it was found to be associated with the p38 mitogen activated protein kinase (MAPK). The p38MAPK signalling pathway regulates the transcription factor activator protein-1 (AP-1) activity, which is the integration point of many signals that can differentially affect the expression and transcriptional activity of a cell. We observed activation of c-Jun, a critical component of the AP-1 complex, mediated by p38MAPK upon the FFL treatment in L-132 cells. Finally, inhibition of p38MAPK by a specific inhibitor attenuates the c-Jun, suggesting the p38MAPK involvement in the c-Jun activation, which in turn transcriptionally activates the induction of IL-8 in response to the lectin. Thus, this study showed a potential lectin-mediated mechanism to modulate the immune response during host-fungus interactions.
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Singh RS, Kaur HP, Kennedy JF. Modulation of immunocyte functions by a mucin-specific lectin from Aspergillus gorakhpurensis. Int J Biol Macromol 2017; 101:172-178. [DOI: 10.1016/j.ijbiomac.2017.03.063] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2016] [Revised: 03/10/2017] [Accepted: 03/13/2017] [Indexed: 11/28/2022]
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Immunomodulatory and therapeutic potential of a mucin-specific mycelial lectin from Aspergillus panamensis. Int J Biol Macromol 2017; 96:241-248. [DOI: 10.1016/j.ijbiomac.2016.12.036] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2016] [Revised: 12/03/2016] [Accepted: 12/05/2016] [Indexed: 11/22/2022]
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Singh RS, Walia AK, Kanwar JR, Kennedy JF. Amoebiasis vaccine development: A snapshot on E. histolytica with emphasis on perspectives of Gal/GalNAc lectin. Int J Biol Macromol 2016; 91:258-68. [DOI: 10.1016/j.ijbiomac.2016.05.043] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2016] [Revised: 05/10/2016] [Accepted: 05/11/2016] [Indexed: 01/10/2023]
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Lectin activity in mycelial extracts of Fusarium species. Braz J Microbiol 2016; 47:775-80. [PMID: 27237111 PMCID: PMC4927685 DOI: 10.1016/j.bjm.2016.04.024] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2015] [Accepted: 11/12/2015] [Indexed: 11/21/2022] Open
Abstract
Lectins are non-immunogenic carbohydrate-recognizing proteins that bind to glycoproteins, glycolipids, or polysaccharides with high affinity and exhibit remarkable ability to agglutinate erythrocytes and other cells. In the present study, ten Fusarium species previously not explored for lectins were screened for the presence of lectin activity. Mycelial extracts of F. fujikuroi, F. beomiformii, F. begoniae, F. nisikadoi, F. anthophilum, F. incarnatum, and F. tabacinum manifested agglutination of rabbit erythrocytes. Neuraminidase treatment of rabbit erythrocytes increased lectin titers of F. nisikadoi and F. tabacinum extracts, whereas the protease treatment resulted in a significant decline in agglutination by most of the lectins. Results of hapten inhibition studies demonstrated unique carbohydrate specificity of Fusarium lectins toward O-acetyl sialic acids. Activity of the majority of Fusarium lectins exhibited binding affinity to d-ribose, l-fucose, d-glucose, l-arabinose, d-mannitol, d-galactosamine hydrochloride, d-galacturonic acid, N-acetyl-d-galactosamine, N-acetyl-neuraminic acid, 2-deoxy-d-ribose, fetuin, asialofetuin, and bovine submaxillary mucin. Melibiose and N-glycolyl neuraminic acid did not inhibit the activity of any of the Fusarium lectins. Mycelial extracts of F. begoniae, F. nisikadoi, F. anthophilum, and F. incarnatum interacted with most of the carbohydrates tested. F. fujikuroi and F. anthophilum extracts displayed strong interaction with starch. The expression of lectin activity as a function of culture age was investigated. Most species displayed lectin activity on the 7th day of cultivation, and it varied with progressing of culture age.
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Singh RS, Kaur HP, Singh J. Purification and characterization of a mycelial mucin specific lectin from Aspergillus panamensis with potent mitogenic and antibacterial activity. Process Biochem 2015. [DOI: 10.1016/j.procbio.2015.10.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Singh RS, Bhari R, Kaur R. Purification, characterization, and mitogenic potential of a mucin-specific mycelial lectin from Aspergillus sparsus. Appl Biochem Biotechnol 2014; 175:1938-47. [PMID: 25432347 DOI: 10.1007/s12010-014-1419-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2014] [Accepted: 11/17/2014] [Indexed: 11/29/2022]
Abstract
Lectins are carbohydrate binding proteins or glycoproteins that bind reversibly to specific carbohydrates present on the apposing cells, which is responsible for their ability to agglutinate red blood cells, lymphocytes, fibroblasts, etc. Due to their carbohydrate specificity, lectins have been used for purification and characterization of glycoproteins like antibodies, cytokines, tumor-associated glycoproteins, hormones, inhibitors, growth factors, various enzymes, membrane proteins (receptors), or even toxins and viruses. In the present study, a mycelial lectin from Aspergillus sparsus was purified, characterized, and evaluated for its mitogenic potential. Lectin could be effectively purified 17.8-fold in a single-step using affinity chromatography on mucin-sepharose column. Lectin migrated as a single band in sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) with an apparent molecular mass of 100.2 kDa. Lectin showed pH optima of 6.5-8.0, and optimum temperature was determined to be 20-30 °C. Lectin was stable within a pH range of 5.5-10.0 and showed fairly good thermostability. Lectin activity was unaffected in the presence of EDTA, while activity reduced upon interaction with denaturants. MTT assay revealed strong mitogenic potential of A. sparsus lectin at a concentration up to 100 μg/ml.
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Affiliation(s)
- Ram Sarup Singh
- Carbohydrate and Protein Biotechnology Laboratory, Department of Biotechnology, Punjabi University, Patiala, 147 002, Punjab, India,
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Antimicrobial activity and carbohydrate specificity of new mycelial lectins from Fusarium sp. Biologia (Bratisl) 2014. [DOI: 10.2478/s11756-014-0449-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Singh RS, Kaur HP, Singh J. Purification and characterization of a mucin specific mycelial lectin from Aspergillus gorakhpurensis: application for mitogenic and antimicrobial activity. PLoS One 2014; 9:e109265. [PMID: 25286160 PMCID: PMC4186849 DOI: 10.1371/journal.pone.0109265] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2014] [Accepted: 09/02/2014] [Indexed: 11/29/2022] Open
Abstract
BACKGROUND Lectins are carbohydrate binding proteins or glycoproteins that bind reversibly to specific carbohydrates present on the apposing cells, which are responsible for their ability to agglutinate red blood cells, lymphocytes, fibroblasts, etc. Interest in lectins has been intensified due to their carbohydrate specificity as they can be valuable reagents for the investigation of cell surface sugars, purification and characterization of glycoproteins. The present study reports the purification, characterization and evaluation of mitogenic and antimicrobial potential of a mycelial lectin from Aspergillus gorakhpurensis. METHODS Affinity chromatography on mucin-sepharose column was carried out for purification of Aspergillus gorakhpurensis lectin. The lectin was characterized for physico-chemical parameters. Mitogenic potential of the lectin was evaluated against splenocytes of Swiss albino mice by MTT assay. Antimicrobial activity of the purified lectin has also been evaluated by disc diffusion assay. RESULTS Single-step affinity purification resulted in 18.6-fold purification of the mycelial lectin. The molecular mass of the lectin was found to be 70 kDa and it was composed of two subunits of 34.8 kDa as determined by gel filtration chromatography, SDS-PAGE and MALDI-TOF analysis. pH optima of the lectin was found to be 6.5-9.5, while optimum temperature for lectin activity was 20-30 °C. Lectin was stable within a pH range of 7.0-10.5 and showed fair thermostability. EDTA did not affect lectin activity whereas it was found susceptible to the denaturants tested. MTT assay revealed strong mitogenic potential of A. gorakhpurensis lectin at a concentration upto 150 µg/mL. Antimicrobial activity assay showed its potent antibacterial activity against Bacillus cereus, Staphylococcous aureus and Escherichia coli and marginal antifungal activity against Saccharomyces cerevisiae. CONCLUSION This is the first report on the mitogenic and antimicrobial potential of Aspergillus gorakhpurensis lectin. The results will provide useful guidelines for further research in clinical applications of this lectin.
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Affiliation(s)
- Ram Sarup Singh
- Carbohydrate and Protein Biotechnology Laboratory, Department of Biotechnology, Punjabi University, Patiala, Punjab, India
| | - Hemant Preet Kaur
- Carbohydrate and Protein Biotechnology Laboratory, Department of Biotechnology, Punjabi University, Patiala, Punjab, India
| | - Jatinder Singh
- Department of Molecular Biology and Biochemistry, Guru Nanak Dev University, Amritsar, Punjab, India
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Lectins in human pathogenic fungi. Rev Iberoam Micol 2014; 31:72-5. [DOI: 10.1016/j.riam.2013.09.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2013] [Accepted: 09/27/2013] [Indexed: 11/21/2022] Open
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Houser J, Komarek J, Kostlanova N, Cioci G, Varrot A, Kerr SC, Lahmann M, Balloy V, Fahy JV, Chignard M, Imberty A, Wimmerova M. A soluble fucose-specific lectin from Aspergillus fumigatus conidia--structure, specificity and possible role in fungal pathogenicity. PLoS One 2013; 8:e83077. [PMID: 24340081 PMCID: PMC3858362 DOI: 10.1371/journal.pone.0083077] [Citation(s) in RCA: 84] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2013] [Accepted: 11/06/2013] [Indexed: 01/26/2023] Open
Abstract
Aspergillus fumigatus is an important allergen and opportunistic pathogen. Similarly to many other pathogens, it is able to produce lectins that may be involved in the host-pathogen interaction. We focused on the lectin AFL, which was prepared in recombinant form and characterized. Its binding properties were studied using hemagglutination and glycan array analysis. We determined the specificity of the lectin towards l-fucose and fucosylated oligosaccharides, including α1-6 linked core-fucose, which is an important marker for cancerogenesis. Other biologically relevant saccharides such as sialic acid, d-mannose or d-galactose were not bound. Blood group epitopes of the ABH and Lewis systems were recognized, Le(Y) being the preferred ligand among others. To provide a correlation between the observed functional characteristics and structural basis, AFL was crystallized in a complex with methyl-α,L-selenofucoside and its structure was solved using the SAD method. Six binding sites, each with different compositions, were identified per monomer and significant differences from the homologous AAL lectin were found. Structure-derived peptides were utilized to prepare anti-AFL polyclonal antibodies, which suggested the presence of AFL on the Aspergillus' conidia, confirming its expression in vivo. Stimulation of human bronchial cells by AFL led to IL-8 production in a dose-dependent manner. AFL thus probably contributes to the inflammatory response observed upon the exposure of a patient to A. fumigatus. The combination of affinity to human epithelial epitopes, production by conidia and pro-inflammatory activity is remarkable and shows that AFL might be an important virulence factor involved in an early stage of A. fumigatus infection.
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Affiliation(s)
- Josef Houser
- Central European Institute for Technology, Masaryk University, Brno, Czech Republic
- National Centre for Biomolecular Research, Faculty of Science, Masaryk University, Brno, Czech Republic
| | - Jan Komarek
- National Centre for Biomolecular Research, Faculty of Science, Masaryk University, Brno, Czech Republic
| | - Nikola Kostlanova
- Central European Institute for Technology, Masaryk University, Brno, Czech Republic
- National Centre for Biomolecular Research, Faculty of Science, Masaryk University, Brno, Czech Republic
| | - Gianluca Cioci
- European Synchrotron Radiation Facility, Grenoble, France
| | - Annabelle Varrot
- CERMAV-CNRS affiliated to Université de Grenoble, Grenoble, France
| | - Sheena C. Kerr
- Department of Medicine and CVRI, University of California San Francisco, San Francisco, California, United States of America
| | - Martina Lahmann
- School of Chemistry, University of Bangor, Bangor, United Kingdom
| | - Viviane Balloy
- Unité de Défense Innée et Inflammation, Institut Pasteur and INSERM U874, Paris, France
| | - John V. Fahy
- Department of Medicine and CVRI, University of California San Francisco, San Francisco, California, United States of America
| | - Michel Chignard
- Unité de Défense Innée et Inflammation, Institut Pasteur and INSERM U874, Paris, France
| | - Anne Imberty
- CERMAV-CNRS affiliated to Université de Grenoble, Grenoble, France
| | - Michaela Wimmerova
- Central European Institute for Technology, Masaryk University, Brno, Czech Republic
- National Centre for Biomolecular Research, Faculty of Science, Masaryk University, Brno, Czech Republic
- Department of Biochemistry, Faculty of Science, Masaryk University, Brno, Czech Republic
- * E-mail:
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Purification and characterization of a thermostable mycelial lectin from basidiomycete Lentinus squarrosulus. Biologia (Bratisl) 2013. [DOI: 10.2478/s11756-013-0273-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Immunomodulatory and therapeutic potential of a mycelial lectin from Aspergillus nidulans. Appl Biochem Biotechnol 2011; 165:624-38. [PMID: 21590306 DOI: 10.1007/s12010-011-9281-4] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2010] [Accepted: 05/04/2011] [Indexed: 10/18/2022]
Abstract
Lectins bind to surface receptors on target cells, and activate a cascade of events, eventually leading to altered immune status of host. The immunomodulatory potential of purified lectin from Aspergillus nidulans was evaluated in Swiss albino mice treated intraperitoneally with seven different doses of purified lectin. Lectin prevented BSA-induced Arthus reaction and systemic anaphylaxis. The enhanced functional ability of macrophages was evident from respiratory burst activity and nitric oxide production in splenocyte cultures. Interferon-gamma and interleukin-6 levels were significantly up-regulated in treated groups. Maximum stimulatory effect was observed at the dose of 1.5 mg/kg body weight. Therapeutic potential of A. nidulans lectin was assessed against trinitrobenzene sulfonic acid-induced ulcerative colitis in male Wistar rats. Rats pre-treated with 80 mg/kg body weight of purified lectin intraperitoneally prior to colitis induction showed lesser disease severity and recovery within 7 days, while rats post-treated with the same dose showed recovery in 11 days. The results demonstrate immunomodulatory effects of A. nidulans lectin in Swiss albino mice, resulting in improved immune status of the animals and unfold its curative effect against ulcerative colitis in rat model. This is the first report on immunomodulatory and therapeutic potential of a lectin from microfungi.
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Singh RS, Bhari R, Kaur HP. Mushroom lectins: current status and future perspectives. Crit Rev Biotechnol 2010; 30:99-126. [PMID: 20105049 DOI: 10.3109/07388550903365048] [Citation(s) in RCA: 95] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Lectins are nonimmune proteins or glycoproteins that bind specifically to cell surface carbohydrates, culminating in cell agglutination. These are known to play key roles in host defense system and also in metastasis. Many new sources have been explored for the occurrence of lectins during the last few years. Numerous novel lectins with unique specificities and exploitable properties have been discovered. Mushrooms have attracted a number of researchers in food and pharmaceuticals. Many species have long been used in traditional Chinese medicines or functional foods in Japan and other Asian countries. A number of bioactive constituents have been isolated from mushrooms including polysaccharides, polysaccharopeptides, polysaccharide-protein complexes, proteases, ribonucleases, ribosome inactivating proteins, antifungal proteins, immunomodulatory proteins, enzymes, lectins, etc. Mushroom lectins are endowed with mitogenic, antiproliferative, antitumor, antiviral, and immune stimulating potential. In this review, an attempt has been made to collate the information on mushroom lectins, their blood group and sugar specificities, with an emphasis on their biomedical potential and future perspectives.
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Affiliation(s)
- Ram Sarup Singh
- Carbohydrate and Protein Biotechnology Laboratory, Department of Biotechnology, Punjabi University, Patiala, Punjab, India.
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Singh RS, Bhari R, Singh J, Tiwary AK. Purification and characterization of a mucin-binding mycelial lectin from Aspergillus nidulans with potent mitogenic activity. World J Microbiol Biotechnol 2010. [DOI: 10.1007/s11274-010-0488-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Singh RS, Bhari R, Rai J. Further screening of Aspergillus
species for occurrence of lectins and their partial characterization. J Basic Microbiol 2010; 50:90-7. [DOI: 10.1002/jobm.200900299] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Singh RS, Bhari R, Kaur HP, Vig M. Purification and Characterization of a Novel Thermostable Mycelial Lectin from Aspergillus terricola. Appl Biochem Biotechnol 2010; 162:1339-49. [DOI: 10.1007/s12010-009-8906-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2009] [Accepted: 12/28/2009] [Indexed: 11/30/2022]
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Singh RS, Sharma S, Kaur G, Bhari R. Screening of Penicillium species for occurrence of lectins and their characterization. J Basic Microbiol 2010; 49:471-6. [PMID: 19798656 DOI: 10.1002/jobm.200800282] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Out of 15 Penicillium species screened for lectin activities, P. griseofulvum and P. thomii were found to possess mycelial lectin activity. None of the species displayed extracellular or cell surface-bound lectin activity. Both species agglutinated rabbit erythrocytes. P. griseofulvum lectin showed specificity to human type O erythrocytes. While P. thomii lectin specifically agglutinated human type A erythrocytes. Highest lectin activities from P. thomii and P. griseofulvum were expressed after 8 and 7 days of growth, respectively. Lectins from both the species displayed a high binding affinity to chondroitin-6-sulphate, mucin, asialofetuin, D-sucrose, and D-trehalose. Ammonium sulphate at 50% saturation yielded 80% of the total lectin activity. Dialysis and ultrafiltration of the precipitates resulted in 1.79 and 3.46 fold purification of P. griseofulvum and P. thomii lectins, respectively. Both lectins showed pH optima between 7.0-8.0 and were stable near the neutral pH after 2 h. P. thomii lectin exhibited optimal activity at 35-40 degrees C, and P. griseofulvum lectin at 30-40 degrees C. P. thomii lectin showed a complete loss of activity above 40 degrees C, P. griseofulvum lectin was stable at or below 35 degrees C.
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Affiliation(s)
- Ram Sarup Singh
- Carbohydrate and Protein Biotechnology Laboratory, Department of Biotechnology, Punjabi University, Patiala, Punjab, India.
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