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De Coninck T, Gippert GP, Henrissat B, Desmet T, Van Damme EJM. Investigating diversity and similarity between CBM13 modules and ricin-B lectin domains using sequence similarity networks. BMC Genomics 2024; 25:643. [PMID: 38937673 PMCID: PMC11212257 DOI: 10.1186/s12864-024-10554-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2024] [Accepted: 06/24/2024] [Indexed: 06/29/2024] Open
Abstract
BACKGROUND The CBM13 family comprises carbohydrate-binding modules that occur mainly in enzymes and in several ricin-B lectins. The ricin-B lectin domain resembles the CBM13 module to a large extent. Historically, ricin-B lectins and CBM13 proteins were considered completely distinct, despite their structural and functional similarities. RESULTS In this data mining study, we investigate structural and functional similarities of these intertwined protein groups. Because of the high structural and functional similarities, and differences in nomenclature usage in several databases, confusion can arise. First, we demonstrate how public protein databases use different nomenclature systems to describe CBM13 modules and putative ricin-B lectin domains. We suggest the introduction of a novel CBM13 domain identifier, as well as the extension of CAZy cross-references in UniProt to guard the distinction between CAZy and non-CAZy entries in public databases. Since similar problems may occur with other lectin families and CBM families, we suggest the introduction of novel CBM InterPro domain identifiers to all existing CBM families. Second, we investigated phylogenetic, nomenclatural and structural similarities between putative ricin-B lectin domains and CBM13 modules, making use of sequence similarity networks. We concluded that the ricin-B/CBM13 superfamily may be larger than initially thought and that several putative ricin-B lectin domains may display CAZyme functionalities, although biochemical proof remains to be delivered. CONCLUSIONS Ricin-B lectin domains and CBM13 modules are associated groups of proteins whose database semantics are currently biased towards ricin-B lectins. Revision of the CAZy cross-reference in UniProt and introduction of a dedicated CBM13 domain identifier in InterPro may resolve this issue. In addition, our analyses show that several proteins with putative ricin-B lectin domains show very strong structural similarity to CBM13 modules. Therefore ricin-B lectin domains and CBM13 modules could be considered distant members of a larger ricin-B/CBM13 superfamily.
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Affiliation(s)
- Tibo De Coninck
- Laboratory of Biochemistry and Glycobiology, Department of Biotechnology, Ghent University, Proeftuinstraat 86, Ghent, 9000, Belgium
- Centre for Synthetic Biology, Department of Biotechnology, Ghent University, Coupure Links 653, Ghent, 9000, Belgium
| | - Garry P Gippert
- Section for Protein Chemistry and Enzyme Technology, Department of Biotechnology & Biomedicine, Technical University of Denmark, Søltofts Plads 224, Kgs. Lyngby, 2800, Denmark
| | - Bernard Henrissat
- Section for Protein Chemistry and Enzyme Technology, Department of Biotechnology & Biomedicine, Technical University of Denmark, Søltofts Plads 224, Kgs. Lyngby, 2800, Denmark
| | - Tom Desmet
- Centre for Synthetic Biology, Department of Biotechnology, Ghent University, Coupure Links 653, Ghent, 9000, Belgium
| | - Els J M Van Damme
- Laboratory of Biochemistry and Glycobiology, Department of Biotechnology, Ghent University, Proeftuinstraat 86, Ghent, 9000, Belgium.
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Sharma A, Gupta S, Sharma NR, Paul K. Expanding role of ribosome-inactivating proteins: From toxins to therapeutics. IUBMB Life 2023; 75:82-96. [PMID: 36121739 DOI: 10.1002/iub.2675] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2022] [Accepted: 08/26/2022] [Indexed: 02/02/2023]
Abstract
Ribosome-inactivating proteins (RIPs) are toxic proteins with N-glycosidase activity. RIPs exert their action by removing a specific purine from 28S rRNA, thereby, irreversibly inhibiting the process of protein synthesis. RIPs can target both prokaryotic and eukaryotic cells. In bacteria, the production of RIPs aid in the process of pathogenesis whereas, in plants, the production of these toxins has been attributed to bolster defense against insects, viral, bacterial and fungal pathogens. In recent years, RIPs have been engineered to target a particular cell type, this has fueled various experiments testing the potential role of RIPs in many biomedical applications like anti-viral and anti-tumor therapies in animals as well as anti-pest agents in engineered plants. In this review, we present a comprehensive study of various RIPs, their mode of action, their significance in various fields involving plants and animals. Their potential as treatment options for plant infections and animal diseases is also discussed.
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Affiliation(s)
- Anuj Sharma
- Department of Biochemistry, DAV University, Jalandhar, Punjab, India
| | - Shelly Gupta
- Department of Biochemistry, School of Biosciences and Bioengineering, Lovely Professional University, Phagwara, Punjab, India
| | - Neeta Raj Sharma
- School of Biosciences and Bioengineering, Lovely Professional University, Phagwara, Punjab, India
| | - Karan Paul
- Department of Biochemistry, DAV University, Jalandhar, Punjab, India
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Mishra V, Mishra R, Shamra RS. Ribosome inactivating proteins - An unfathomed biomolecule for developing multi-stress tolerant transgenic plants. Int J Biol Macromol 2022; 210:107-122. [PMID: 35525494 DOI: 10.1016/j.ijbiomac.2022.05.004] [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: 01/23/2022] [Revised: 04/10/2022] [Accepted: 05/01/2022] [Indexed: 11/15/2022]
Abstract
Transgenic crops would serve as a tool to overcome the forthcoming crisis in food security and environmental safety posed by degrading land and changing global climate. Commercial transgenic crops developed so far focus on single stress; however, sustaining crop yield to ensure food security requires transgenics tolerant to multiple environmental stresses. Here we argue and demonstrate the untapped potential of ribosome inactivating proteins (RIPs), translation inhibitors, as potential transgenes in developing transgenics to combat multiple stresses in the environment. Plant RIPs target the fundamental processes of the cell with very high specificity to the infecting pests. While controlling pathogens, RIPs also cause ectopic expression of pathogenesis-related proteins and trigger systemic acquired resistance. On the other hand, during abiotic stress, RIPs show antioxidant activity and trigger both enzyme-dependent and enzyme-independent metabolic pathways, alleviating abiotic stress such as drought, salinity, temperature, etc. RIPs express in response to specific environmental signals; therefore, their expression obviates additional physiological load on the transgenic plants instead of the constitutive expression. Based on evidence from its biological significance, ecological roles, laboratory- and controlled-environment success of its transgenics, and ethical merits, we unravel the potential of RIPs in developing transgenic plants showing co-tolerance to multiple environmental stresses.
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Affiliation(s)
- Vandana Mishra
- Bioresources and Environmental Biotechnology Laboratory, Department of Environmental Studies, University of Delhi, Delhi 110007, India.
| | - Ruchi Mishra
- Bioresources and Environmental Biotechnology Laboratory, Department of Environmental Studies, University of Delhi, Delhi 110007, India; Jesus and Mary College, University of Delhi, Chanakyapuri, Delhi 110021, India.
| | - Radhey Shyam Shamra
- Bioresources and Environmental Biotechnology Laboratory, Department of Environmental Studies, University of Delhi, Delhi 110007, India; Delhi School of Climate Change & Sustainability, Institute of Eminence, University of Delhi, Delhi 110007, India.
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Maiello S, Iglesias R, Polito L, Citores L, Bortolotti M, Ferreras JM, Bolognesi A. Sequence, Structure, and Binding Site Analysis of Kirkiin in Comparison with Ricin and Other Type 2 RIPs. Toxins (Basel) 2021; 13:toxins13120862. [PMID: 34941700 PMCID: PMC8705660 DOI: 10.3390/toxins13120862] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Revised: 11/26/2021] [Accepted: 11/30/2021] [Indexed: 11/29/2022] Open
Abstract
Kirkiin is a new type 2 ribosome-inactivating protein (RIP) purified from the caudex of Adenia kirkii with a cytotoxicity compared to that of stenodactylin. The high toxicity of RIPs from Adenia genus plants makes them interesting tools for biotechnology and therapeutic applications, particularly in cancer therapy. The complete amino acid sequence and 3D structure prediction of kirkiin are here reported. Gene sequence analysis revealed that kirkiin is encoded by a 1572 bp open reading frame, corresponding to 524 amino acid residues, without introns. The amino acid sequence analysis showed a high degree of identity with other Adenia RIPs. The 3D structure of kirkiin preserves the overall folding of type 2 RIPs. The key amino acids of the active site, described for ricin and other RIPs, are also conserved in the kirkiin A chain. Sugar affinity studies and docking experiments revealed that both the 1α and 2γ sites of the kirkiin B chain exhibit binding activity toward lactose and D-galactose, being lower than ricin. The replacement of His246 in the kirkiin 2γ site instead of Tyr248 in ricin causes a different structure arrangement that could explain the lower sugar affinity of kirkiin with respect to ricin.
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Affiliation(s)
- Stefania Maiello
- Department of Experimental, Diagnostic and Specialty Medicine—DIMES, Alma Mater Studiorum—University of Bologna, Via S. Giacomo 14, 40126 Bologna, Italy; (S.M.); (M.B.); (A.B.)
| | - Rosario Iglesias
- Department of Biochemistry and Molecular Biology and Physiology, Faculty of Sciences, University of Valladolid, 47011 Valladolid, Spain; (L.C.); (J.M.F.)
- Correspondence: (R.I.); (L.P.)
| | - Letizia Polito
- Department of Experimental, Diagnostic and Specialty Medicine—DIMES, Alma Mater Studiorum—University of Bologna, Via S. Giacomo 14, 40126 Bologna, Italy; (S.M.); (M.B.); (A.B.)
- Correspondence: (R.I.); (L.P.)
| | - Lucía Citores
- Department of Biochemistry and Molecular Biology and Physiology, Faculty of Sciences, University of Valladolid, 47011 Valladolid, Spain; (L.C.); (J.M.F.)
| | - Massimo Bortolotti
- Department of Experimental, Diagnostic and Specialty Medicine—DIMES, Alma Mater Studiorum—University of Bologna, Via S. Giacomo 14, 40126 Bologna, Italy; (S.M.); (M.B.); (A.B.)
| | - José M. Ferreras
- Department of Biochemistry and Molecular Biology and Physiology, Faculty of Sciences, University of Valladolid, 47011 Valladolid, Spain; (L.C.); (J.M.F.)
| | - Andrea Bolognesi
- Department of Experimental, Diagnostic and Specialty Medicine—DIMES, Alma Mater Studiorum—University of Bologna, Via S. Giacomo 14, 40126 Bologna, Italy; (S.M.); (M.B.); (A.B.)
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Song C, Wei XY, Qiu ZD, Gong L, Chen ZY, Ma Y, Shen Y, Zhao YJ, Wang WH, Lai CJS, Yang B. Exploring the resources of the genus Viscum for potential therapeutic applications. JOURNAL OF ETHNOPHARMACOLOGY 2021; 277:114233. [PMID: 34044077 DOI: 10.1016/j.jep.2021.114233] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2020] [Revised: 05/03/2021] [Accepted: 05/20/2021] [Indexed: 06/12/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE The genus Viscum comprises approximately 100 species that are mainly distributed across Africa, Asia and Europe. The extracts and preparations of Viscum species are widely used as common complementary and alternative medicines in the treatment of rheumatism and cancer. AIM OF THE REVIEW This review aims to explore the medicinal properties of twelve species belonging to the genus Viscum for potential therapeutic applications. MATERIALS AND METHODS We collected online information (including PubMed, CNKI, Google Scholar, and Web of Science) from January 1915 to April 2021 and knowledge from classical books on Chinese herbal medicines available for 12 species of the genus Viscum, including Viscum coloratum (Kom.) Nakai, Viscum album L., Viscum articulatum Burm. f., Viscum liquidambaricola Hayata, Viscum ovalifolium DC., Viscum capitellatum Sm., Viscum cruciatum Sieber ex Boiss., Viscum nudum Danser, Viscum angulatum B.Heyne ex DC., Viscum tuberculatum A.Rich., Viscum multinerve Hayata, and Viscum diospyrosicola Hayata. RESULTS At least 250 different compounds have been reported across twelve Viscum species, including amino acid and peptides, alkaloids, phenolic acids, flavonoids, terpenoids, carbohydrates, fatty acids, lipids, and other types of compounds. In particular, for Viscum coloratum (Kom.) Nakai and Viscum album L., the plants, preparations, and bioactive components have been thoroughly reviewed. This has allowed to elucidate the role of active components, including lectins, viscotoxins, flavonoids, terpenoids, phenolic acids, and polysaccharides, in multiple bioactivities, such as anti-cancer, anti-rheumatism arthralgia, anti-inflammation, anti-cardiovascular diseases, enhancing immunity, and anti-chemotherapy side effects. We also evaluated quality control methods based on active compounds, in vivo exposure compounds, and discriminated chemical markers. CONCLUSIONS This is the first report to systematically review the pharmaceutical development history, chemical composition, clinical evidence, pharmacological activity, discriminated chemical markers, in vivo exposure, and quality control on twelve distinct species of Viscum plants with medicinal properties. The significant safety and efficacy, along with the minor side effects are constantly confirmed in clinics. The genus Viscum is thus an important medicinal resource that is worth exploring and developing in future pharmacological and chemical studies.
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Affiliation(s)
- Chuan Song
- Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing, 100700, PR China; State Key Laboratory Breeding Base of Dao-di Herbs, National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing, 100700, PR China
| | - Xu-Ya Wei
- Academician Workstation, Jiangxi University of Traditional Chinese Medicine, Nanchang, 330004, PR China
| | - Zi-Dong Qiu
- State Key Laboratory Breeding Base of Dao-di Herbs, National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing, 100700, PR China
| | - Li Gong
- State Key Laboratory Breeding Base of Dao-di Herbs, National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing, 100700, PR China
| | - Ze-Yan Chen
- State Key Laboratory Breeding Base of Dao-di Herbs, National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing, 100700, PR China
| | - Ying Ma
- State Key Laboratory Breeding Base of Dao-di Herbs, National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing, 100700, PR China
| | - Ye Shen
- State Key Laboratory Breeding Base of Dao-di Herbs, National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing, 100700, PR China
| | - Yu-Jun Zhao
- State Key Laboratory Breeding Base of Dao-di Herbs, National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing, 100700, PR China
| | - Wei-Hao Wang
- Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing, 100700, PR China
| | - Chang-Jiang-Sheng Lai
- State Key Laboratory Breeding Base of Dao-di Herbs, National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing, 100700, PR China.
| | - Bin Yang
- Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing, 100700, PR China.
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Choudhary N, Lodha ML, Baranwal VK. The role of enzymatic activities of antiviral proteins from plants for action against plant pathogens. 3 Biotech 2020; 10:505. [PMID: 33184592 PMCID: PMC7642053 DOI: 10.1007/s13205-020-02495-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Accepted: 10/19/2020] [Indexed: 11/25/2022] Open
Abstract
Antiviral proteins (AVPs) from plants possess multiple activities, such as N-glycosidase, RNase, DNase enzymatic activity, and induce pathogenesis-related proteins, salicylic acid, superoxide dismutase, peroxidase, and catalase. The N-glycosidase activity releases the adenine residues from sarcin/ricin (S/R) loop of large subunit of ribosomes and interfere the host protein synthesis process and this activity has been attributed for antiviral activity in plant. It has been shown that AVP binds directly to viral genome-linked protein of plant viruses and interfere with protein synthesis of virus. AVPs also possess the RNase and DNase like activity and may be targeting nucleic acid of viruses directly. Recently, the antifungal, antibacterial, and antiinsect properties of AVPs have also been demonstrated. Gene encoding for AVPs has been used for the development of transgenic resistant crops to a broad range of plant pathogens and insect pests. However, the cytotoxicity has been observed in transgenic crops using AVP gene in some cases which can be a limiting factor for its application in agriculture. In this review, we have reviewed various aspects of AVPs particularly their characteristics, possible mode of action and application.
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Affiliation(s)
- Nandlal Choudhary
- Amity Institute of Virology & Immunology, Amity University Uttar Pradesh, Noida, 201313 India
| | - M. L. Lodha
- Division of Biochemistry, Indian Agricultural Research Institute, Pusa, New Delhi, 110012 India
| | - V. K. Baranwal
- Division of Plant Pathology, Indian Agricultural Research Institute, Pusa, New Delhi, 110012 India
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Mishra R, Sharma S, Sharma RS, Singh S, Sardesai MM, Sharma S, Mishra V. Viscum articulatum Burm. f. aqueous extract exerts antiproliferative effect and induces cell cycle arrest and apoptosis in leukemia cells. JOURNAL OF ETHNOPHARMACOLOGY 2018; 219:91-102. [PMID: 29555410 DOI: 10.1016/j.jep.2018.03.005] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2017] [Revised: 03/06/2018] [Accepted: 03/06/2018] [Indexed: 06/08/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Viscum articulatum Burm. f. (leafless mistletoe) has been used in traditional system of medicines in India, China, Taiwan, Cambodia, Laos, and Vietnam, to treat blood-related diseases and various inflammatory and degenerative diseases including cancer. Anticancer activities of some phytomolecules purified from Viscum articulatum Burm. f. have been tested. However scientific evidence for the anticancerous potential of aqueous extract of V. articularum (VAQE) used in traditional medicine is lacking. AIM OF THE STUDY To study the antiproliferative and apoptotic effect of VAQE on Jurkat E6.1 and THP1 leukemia cells. MATERIALS AND METHODS The aqueous extract of the whole plant of Viscum articulatum Burm. f. was prepared in phosphate buffer saline. In VAQE, total soluble protein was estimated using Bradford's dye-binding assay; flavonoid content was determined using aluminum chloride colorimetric assay; and phenolic content was estimated following Folin-Ciocalteu colorimetric assay. XTT cell viability assay was used to test VAQE induced cytotoxicity in Jurkat E6.1 and THP1 leukemia cells and peripheral blood mononuclear cells (PBMC). The effect of VAQE on cell cycle progression was analyzed by PI staining using flow cytometry. Annexin-V-FITC/PI differential staining method was used for detecting the onset of apoptosis in leukemia cells. Rhodamine 123 dye was used to detect the change in mitochondrial membrane potential (MMP) using flow cytometry. DCF-DA fluorescence dye was used to estimate the level of reactive oxygen species (ROS). The ROS inhibitors were used to evaluate the role of ROS in mediating DNA degradation in VAQE-treated leukemia cells. The molecular mechanisms underlying VAQE induced apoptosis induction was studied by analyzing the expression of anti-apoptotic (Bcl-2) and pro-apoptotic (Bax) proteins, caspase-8 and caspase-3 enzymes using western blot. Diphenylamine (DPA) assay was used to determine the DNA fragmentation and conclusion of apoptosis. RESULTS VAQE triggered cytotoxic effect on Jurkat E6.1 (IC50-2.4 µg/ml; 24 h) and THP1 (IC50-1.0 µg/ml; 24 h) cells in a dose- and time-dependent manner. The apoptosis induction and G2/M arrest of the cell cycle are the cause of VAQE-induced cytotoxicity in leukemia cells. The apoptosis in VAQE-treated Jurkat E6.1 and THP1 cells was mediated via a reduction in MMP, elevation of intracellular ROS, decreased expression of the anti-apoptotic (Bcl-2) and increased expression of the pro-apoptotic (Bax) protein, activation of caspase-8 and caspase-3 and DNA fragmentation. CONCLUSION VAQE has a high efficacy to exert a cytotoxic effect in Jurkat E6.1 and THP1 cells and to induce apoptosis and G2/M cell cycle arrest. VAQE induces extrinsic pathway of apoptosis in both the leukemia cell lines via disruption of MMP, intracellular ROS imbalance, increased ratio of Bax/Bcl-2, activation of caspase-8, caspase-3 and ROS-mediated DNA fragmentation. The knowledge gained from the outcomes of the study may encourage the identification of novel chemotherapeutic agent from Viscum articulatum Burm. f. to treat leukemia.
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Affiliation(s)
- Ruchi Mishra
- Bioresources and Environmental Biotechnology Laboratory, Department of Environmental Studies, University of Delhi, Delhi 110007, India
| | - Saurabh Sharma
- Bioresources and Environmental Biotechnology Laboratory, Department of Environmental Studies, University of Delhi, Delhi 110007, India
| | - Radhey Shyam Sharma
- Bioresources and Environmental Biotechnology Laboratory, Department of Environmental Studies, University of Delhi, Delhi 110007, India
| | - Savita Singh
- Bioresources and Environmental Biotechnology Laboratory, Department of Environmental Studies, University of Delhi, Delhi 110007, India
| | | | - Sadhna Sharma
- Department of Zoology, Miranda House, University of Delhi, Delhi 110007, India
| | - Vandana Mishra
- Bioresources and Environmental Biotechnology Laboratory, Department of Environmental Studies, University of Delhi, Delhi 110007, India.
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Singh S, Mishra R, Sharma RS, Mishra V. Phenol remediation by peroxidase from an invasive mesquite: Turning an environmental wound into wisdom. JOURNAL OF HAZARDOUS MATERIALS 2017; 334:201-211. [PMID: 28412630 DOI: 10.1016/j.jhazmat.2017.04.007] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2017] [Revised: 04/01/2017] [Accepted: 04/03/2017] [Indexed: 06/07/2023]
Abstract
The present study examines mesquite (Prosopis juliflora), an invasive species, to yield peroxidase that may reduce hazards of phenolics to living organisms. As low as 0.3U of low-purity mesquite peroxidase (MPx) efficiently remove phenol and chlorophenols (90-92%) compared with Horseradish peroxidase (HRP) (40-60%). MPx shows a very high removal efficiency (40-50%) at a wide range of pH (2-9) and temperature (20-80°C), as opposed to HRP (15-20%). At a high-level of the substrate (2.4mM) and without the addition of PEG, MPx maintains a significant phenolic removal (60-≥92%) and residual activity (∼25%). It proves the superiority of MPx over HRP, which showed insignificant removal (10-12%) under similar conditions, and no residual activity even with PEG addition. The root elongation and plant growth bioassays confirm phenolic detoxification by MPx. Readily availability of mesquite across the countries and easy preparation of MPx from leaves make this tree as a sustainable source for a low-technological solution for phenol remediation. This study is the first step towards converting a biological wound of invasive species into wisdom and strength for protecting the environment from phenol pollution.
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Affiliation(s)
- Savita Singh
- Bioresources and Environmental Biotechnology, Laboratory, Department of Environmental Studies, University of Delhi, Delhi-110 007, India
| | - Ruchi Mishra
- Bioresources and Environmental Biotechnology, Laboratory, Department of Environmental Studies, University of Delhi, Delhi-110 007, India
| | - Radhey Shyam Sharma
- Bioresources and Environmental Biotechnology, Laboratory, Department of Environmental Studies, University of Delhi, Delhi-110 007, India
| | - Vandana Mishra
- Bioresources and Environmental Biotechnology, Laboratory, Department of Environmental Studies, University of Delhi, Delhi-110 007, India.
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Articulatin-D induces apoptosis via activation of caspase-8 in acute T-cell leukemia cell line. Mol Cell Biochem 2016; 426:87-99. [DOI: 10.1007/s11010-016-2883-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2016] [Accepted: 11/07/2016] [Indexed: 12/14/2022]
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10
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Awadallah AKE, Osman MEM, Ibrahim MA, Bernardes ES, Dias-Baruffi M, Konozy EHE. Isolation and partial characterization of 3 nontoxic d-galactose-specific isolectins from seeds of Momordica balsamina. J Mol Recognit 2016; 30. [PMID: 27774692 DOI: 10.1002/jmr.2582] [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] [Received: 05/29/2016] [Revised: 08/11/2016] [Accepted: 08/26/2016] [Indexed: 11/08/2022]
Abstract
Three isolectins denoted hereforth MBaL-30, MBaL-60, and MBaL-80 were isolated from seeds extract of Momordica balsamina by 30%, 60%, and 80% ammonium sulfate saturations, respectively. The native molecular weights of these lectins, as judged by gel filtration, were 108, 56, and 160 kDa, respectively. On SDS-PAGE, under reduced condition, 27 kDa band was obtained for all isolectins. The lectins hemagglutinating activities were variably inhibited by d-galactose (minimum inhibitory concentrations = 12.5mM, 50mM, and 0.391mM, respectively). MBaL-30 and -60 could agglutinate all human blood types with slight preference for the A and O blood groups, whereas MBaL-80 did not agglutinate B and AB blood types. The 3 isolectins were purified from crude seeds extract, collectively, in a single step on the affinity matrix Lactamyl-Seralose 4B; this purified lectin fraction, which contains all isolectins, is termed MBaL. The N-terminal of MBaL till the 25th amino acid was NLSLSELDFSADTYKSFIKNLRKQL, which shares 88% sequence identity with Momordica charantia lectin type-2 ribosomal inactivating protein from Momordica charantia and 50% with momordin II from Momordica balsamina. MBaL retained 100% activity at up to 50°C for 30 minutes. MBaL-30 and MBaL-60 exhibited maximum activities in the pH range between 4 and 8, while MBaL-80 was showing maximum activity in the pH range between 3 and 5. Treatment of MBaL-30 and MBaL-60 with EDTA completely abolished their hemagglutinating activities. Addition of Zn and Fe ions to the ethylenediaminetetraacetic acid-treated MBaL-30 and MBaL-60 lectins did not only regained the loss of activity but also resulted in 200% to 300% increase in activity, respectively. MBaL-30 and -60 agglutinated gram positive Listeria monocytogenes and Staphylococcus aureus, whereas MBaL-30 could merely agglutinate Escherichia coli. None of these lectins could arrest bacterial growth. Addition of MBaL to cancer cell lines (Gastric cancer cell line (AGS) and Gastric cencer cell line (MKN45), Glioblastoma (ECV-304), and Human urinary bladder cancer cell line (U87-MG)) at varying concentrations did not cause statistically significant changes on cell growth and viability.
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Affiliation(s)
- Amna K E Awadallah
- Department of Zoology, Faculty of Science, University of Khartoum, Khartoum, Sudan
| | | | - Mariam A Ibrahim
- College of Medical Laboratory Science, Sudan University of Science and Technology, Khartoum, Sudan
| | | | - Marcelo Dias-Baruffi
- Faculdade De Ciêncies, Farmacêuticas De Ribeirão Preto, SP, 14040903, Universidade De São Paulo, São Paulo, Brazil
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Villanueva J, Quirós LM, Castañón S. Purification and partial characterization of a ribosome-inactivating protein from the latex of Euphorbia trigona Miller with cytotoxic activity toward human cancer cell lines. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2015; 22:689-695. [PMID: 26141754 DOI: 10.1016/j.phymed.2015.04.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2015] [Revised: 03/10/2015] [Accepted: 04/06/2015] [Indexed: 06/04/2023]
Abstract
BACKGROUND The objective of this study is to investigate the cytotoxic activity of three isolectins purified from the latex of Euphorbia trigona Miller. HYPOTHESIS Among lectins are the ribosome-inactivating proteins (RIPs), which are potent inhibitors of protein synthesis in cells and in cell-free systems. RESULTS Three isolectins, ETR1, ETR2 and ETR3, were purified by anion exchange chromatography. Both ETR1 and ETR3 yielded a single band on SDS-PAGE under reducing conditions, corresponding to a molecular weight of 32 g mol(-1), while ETR2 yielded two bands corresponding to 31 and 33 g mol(-1). When non-reducing conditions were used molecular weight decreased, indicating the presence of intrachain disulfide bonds. Size-exclusion chromatography revealed proteins of apparent molecular weight of 59-63 g mol(-1), suggesting a dimeric nature, with subunits not being held together by disulfide linkage. ETR1, ETR2 and ETR3 hemagglutinated human, sheep and rat erythrocytes and this hemagglutination was specifically inhibited by galactose and its derivatives. The lectins studied were thermostable up to 60 °C and their observed activity was maintained across pH range 5-12. These lectins, from the latex of Euphorbia trigona, are potent inhibitors of eukaryotic protein synthesis in a cell-free system. Flow cytometry analysis revealed the antiproliferative activity of them toward A549, HeLa, H116, HL-60 cell lines. CONCLUSION Euphorbia trigona isolectins are RIPs with cytotoxic activity toward human cancer cell lines.
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Affiliation(s)
- Judith Villanueva
- Neiker-Tecnalia, Biotechnology Department, Arkaute Agrifood Campus, PO Box 46, 01080 Vitoria-Gasteiz, Álava, Spain
| | - Luis Manuel Quirós
- University Institute of Oncology of Asturias and Department of Functional Biology, University of Oviedo, Julian Claveria s/n, Oviedo 33006, Spain
| | - Sonia Castañón
- Neiker-Tecnalia, Biotechnology Department, Arkaute Agrifood Campus, PO Box 46, 01080 Vitoria-Gasteiz, Álava, Spain .
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Schrot J, Weng A, Melzig MF. Ribosome-inactivating and related proteins. Toxins (Basel) 2015; 7:1556-615. [PMID: 26008228 PMCID: PMC4448163 DOI: 10.3390/toxins7051556] [Citation(s) in RCA: 77] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2015] [Revised: 04/23/2015] [Accepted: 04/28/2015] [Indexed: 01/15/2023] Open
Abstract
Ribosome-inactivating proteins (RIPs) are toxins that act as N-glycosidases (EC 3.2.2.22). They are mainly produced by plants and classified as type 1 RIPs and type 2 RIPs. There are also RIPs and RIP related proteins that cannot be grouped into the classical type 1 and type 2 RIPs because of their different sizes, structures or functions. In addition, there is still not a uniform nomenclature or classification existing for RIPs. In this review, we give the current status of all known plant RIPs and we make a suggestion about how to unify those RIPs and RIP related proteins that cannot be classified as type 1 or type 2 RIPs.
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Affiliation(s)
- Joachim Schrot
- Institute of Pharmacy, Freie Universitaet Berlin, Koenigin-Luise-Str. 2 + 4, 14195 Berlin, Germany.
| | - Alexander Weng
- Institute of Pharmacy, Freie Universitaet Berlin, Koenigin-Luise-Str. 2 + 4, 14195 Berlin, Germany.
| | - Matthias F Melzig
- Institute of Pharmacy, Freie Universitaet Berlin, Koenigin-Luise-Str. 2 + 4, 14195 Berlin, Germany.
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Polito L, Bortolotti M, Mercatelli D, Mancuso R, Baruzzi G, Faedi W, Bolognesi A. Protein synthesis inhibition activity by strawberry tissue protein extracts during plant life cycle and under biotic and abiotic stresses. Int J Mol Sci 2013; 14:15532-45. [PMID: 23892598 PMCID: PMC3759871 DOI: 10.3390/ijms140815532] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2013] [Revised: 06/24/2013] [Accepted: 07/17/2013] [Indexed: 01/15/2023] Open
Abstract
Ribosome-inactivating proteins (RIPs), enzymes that are widely distributed in the plant kingdom, inhibit protein synthesis by depurinating rRNA and many other polynucleotidic substrates. Although RIPs show antiviral, antifungal, and insecticidal activities, their biological and physiological roles are not completely understood. Additionally, it has been described that RIP expression is augmented under stressful conditions. In this study, we evaluated protein synthesis inhibition activity in partially purified basic proteins (hereafter referred to as RIP activity) from tissue extracts of Fragaria × ananassa (strawberry) cultivars with low (Dora) and high (Record) tolerance to root pathogens and fructification stress. Association between the presence of RIP activity and the crop management (organic or integrated soil), growth stage (quiescence, flowering, and fructification), and exogenous stress (drought) were investigated. RIP activity was found in every tissue tested (roots, rhizomes, leaves, buds, flowers, and fruits) and under each tested condition. However, significant differences in RIP distribution were observed depending on the soil and growth stage, and an increase in RIP activity was found in the leaves of drought-stressed plants. These results suggest that RIP expression and activity could represent a response mechanism against biotic and abiotic stresses and could be a useful tool in selecting stress-resistant strawberry genotypes.
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Affiliation(s)
- Letizia Polito
- Department of Experimental, Diagnostic and Specialty Medicine (DIMES); Alma Mater Studiorum-University of Bologna, Bologna 40126, Italy; E-Mails: (L.P.); (M.B.); (D.M.); (R.M.)
| | - Massimo Bortolotti
- Department of Experimental, Diagnostic and Specialty Medicine (DIMES); Alma Mater Studiorum-University of Bologna, Bologna 40126, Italy; E-Mails: (L.P.); (M.B.); (D.M.); (R.M.)
| | - Daniele Mercatelli
- Department of Experimental, Diagnostic and Specialty Medicine (DIMES); Alma Mater Studiorum-University of Bologna, Bologna 40126, Italy; E-Mails: (L.P.); (M.B.); (D.M.); (R.M.)
| | - Rossella Mancuso
- Department of Experimental, Diagnostic and Specialty Medicine (DIMES); Alma Mater Studiorum-University of Bologna, Bologna 40126, Italy; E-Mails: (L.P.); (M.B.); (D.M.); (R.M.)
| | - Gianluca Baruzzi
- Agricultural Research Council (CRA-FRF), Forlì 47121, Italy; E-Mails: (G.B.); (W.F.)
| | - Walther Faedi
- Agricultural Research Council (CRA-FRF), Forlì 47121, Italy; E-Mails: (G.B.); (W.F.)
| | - Andrea Bolognesi
- Department of Experimental, Diagnostic and Specialty Medicine (DIMES); Alma Mater Studiorum-University of Bologna, Bologna 40126, Italy; E-Mails: (L.P.); (M.B.); (D.M.); (R.M.)
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +39-05-1209-4729; Fax: +39-05-1209-4746
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Nascimento KS, Cunha AI, Nascimento KS, Cavada BS, Azevedo AM, Aires-Barros MR. An overview of lectins purification strategies. J Mol Recognit 2012; 25:527-41. [DOI: 10.1002/jmr.2200] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Kelany S. Nascimento
- Institute for Biotechnology and Bioengineering (IBB), Centre for Biological and Chemical Engineering, Department of Bioengineering, Instituto Superior Técnico; Technical University of Lisbon; Av. Rovisco Pais; 1049-001; Lisbon; Portugal
| | - Ana I. Cunha
- Institute for Biotechnology and Bioengineering (IBB), Centre for Biological and Chemical Engineering, Department of Bioengineering, Instituto Superior Técnico; Technical University of Lisbon; Av. Rovisco Pais; 1049-001; Lisbon; Portugal
| | - Kyria S. Nascimento
- Biochemistry and Molecular Biology Department; Federal University of Ceará (UFC); CEP 60.455-970; Fortaleza; Ceará; Brazil
| | - Benildo S. Cavada
- Biochemistry and Molecular Biology Department; Federal University of Ceará (UFC); CEP 60.455-970; Fortaleza; Ceará; Brazil
| | - Ana M. Azevedo
- Institute for Biotechnology and Bioengineering (IBB), Centre for Biological and Chemical Engineering, Department of Bioengineering, Instituto Superior Técnico; Technical University of Lisbon; Av. Rovisco Pais; 1049-001; Lisbon; Portugal
| | - Maria Raquel Aires-Barros
- Institute for Biotechnology and Bioengineering (IBB), Centre for Biological and Chemical Engineering, Department of Bioengineering, Instituto Superior Técnico; Technical University of Lisbon; Av. Rovisco Pais; 1049-001; Lisbon; Portugal
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Bayer H, Ey N, Wattenberg A, Voss C, Berger MR. Purification and characterization of riproximin from Ximenia americana fruit kernels. Protein Expr Purif 2012; 82:97-105. [DOI: 10.1016/j.pep.2011.11.018] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2011] [Revised: 11/28/2011] [Accepted: 11/30/2011] [Indexed: 11/29/2022]
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16
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Das MK, Sharma RS, Mishra V. Induction of apoptosis by ribosome inactivating proteins: importance of N-glycosidase activity. Appl Biochem Biotechnol 2012; 166:1552-61. [PMID: 22262020 DOI: 10.1007/s12010-012-9550-x] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2011] [Accepted: 01/05/2012] [Indexed: 11/26/2022]
Abstract
Apoptotic cell death is a fundamental process in the development and physiological homeostasis of multicellular organisms. It is associated with control of cell numbers in tissues and organs during development, with cell turnover, and with response to infection. Molecules that trigger this process in continuously proliferating cancer cells can be used as chemotherapeutic agents. Ribosome inactivating proteins (RIPs) that inhibit translation in a cell by depurinating (N-glycosidase activity) the 28S rRNA are known to serve as apoptosis inducers. However, the role of depurination activity of the RIPs in apoptosis induction is still controversial. Presently, there are three different hypotheses which propose that depurination is: (1) essential, (2) essential but not the sole factor, or (3) not essential for apoptosis induction. This article reviews various experimental outcomes on the importance of N-glycosidase activity of RIPs in the induction of apoptosis.
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Affiliation(s)
- Mrinal Kumar Das
- Department of Environmental Studies, Laboratory of Bioresources & Environmental Biotechnology, University of Delhi, Delhi, -110 007, India
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Das MK, Sharma RS, Mishra V. A cytotoxic type-2 ribosome inactivating protein (from leafless mistletoe) lacking sugar binding activity. Int J Biol Macromol 2011; 49:1096-103. [DOI: 10.1016/j.ijbiomac.2011.09.006] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2011] [Revised: 09/03/2011] [Accepted: 09/06/2011] [Indexed: 11/16/2022]
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Das MK, Sharma RS, Mishra V. A novel cationic peroxidase (VanPrx) from a hemi-parasitic plant (Viscum angulatum) of Western Ghats (India): Purification, characterization and kinetic properties. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/j.molcatb.2011.03.010] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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19
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Sharma RS, Mishra V, Mohmmed A, Babu CR. Variations in Outer-membrane Characteristics of Two Stem-nodulating Bacteria of Sesbania rostrata and its Role in Tolerance Towards Diverse Stress. Curr Microbiol 2011; 63:81-6. [DOI: 10.1007/s00284-011-9946-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2011] [Accepted: 04/25/2011] [Indexed: 11/28/2022]
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20
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Costa RM, Vaz AF, Oliva ML, Coelho LC, Correia MT, Carneiro-da-Cunha MG. A new mistletoe Phthirusa pyrifolia leaf lectin with antimicrobial properties. Process Biochem 2010. [DOI: 10.1016/j.procbio.2009.11.013] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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Abstract
There are only a few reports on agglutinins from ascomycete and medicinal fungi. An HA (haemagglutinin), with an N-terminal amino acid sequence different from those of known lectins, was isolated in the present study from dried fruiting bodies of the medicinal ascomycete fungus Cordyceps militaris. The purification protocol consisted of affinity chromatography, ion-exchange chromatography and gel filtration. The haemagglutinating activity of the HA could not be inhibited by simple sugars or heparin, and was stable over the pH range 2–13 and up to 60°C. Chemical modification of tryptophan and tyrosine residues had no effect. The HA exhibited some antiproliferative activity towards hepatoma (HepG2) cells and inhibited HIV-1 reverse transcriptase (IC50=10 μM). However, it did not exhibit antifungal activity, mitogenic activity towards splenocytes, nitric oxide-inducing activity towards macrophages or RNase activity. The results of the present study add to the meagre information pertaining to agglutinins from ascomycete and medicinal mushrooms. It is revealed in this study that C. militaris HA differs from other ascomycete mushroom HAs in a variety of biochemical characteristics.
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Sharma RS, Mishra V, Mohmmed A, Babu CR. Phage specificity and lipopolysaccarides of stem- and root-nodulating bacteria (Azorhizobium caulinodans, Sinorhizobium spp., and Rhizobium spp.) of Sesbania spp. Arch Microbiol 2007; 189:411-8. [DOI: 10.1007/s00203-007-0322-x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2007] [Revised: 10/02/2007] [Accepted: 10/24/2007] [Indexed: 11/25/2022]
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24
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Mishra V, Bilgrami S, Sharma RS, Kaur P, Yadav S, Krauspenhaar R, Betzel C, Voelter W, Babu CR, Singh TP. Crystal Structure of Himalayan Mistletoe Ribosome-inactivating Protein Reveals the Presence of a Natural Inhibitor and a New Functionally Active Sugar-binding Site. J Biol Chem 2005; 280:20712-21. [PMID: 15774467 DOI: 10.1074/jbc.m500735200] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Ribosome-inactivating proteins (RIPs) are toxins involved in plant defense. How the plant prevents autotoxicity is not yet fully understood. The present study is the first structural evidence of a naturally inhibited form of RIP from a plant. Himalayan mistletoe RIP (HmRIP) was purified from Viscum album leaves and crystallized with lactose. The structure was determined by the molecular replacement method and refined at 2.8-A resolution. The crystal structure revealed the presence of high quality non-protein electron density at the active site, into which a pteridine derivative (2-amino 4-isopropyl 6-carboxyl pteridine) was modeled. The carboxyl group of the ligand binds strongly with the key active site residue Arg(162), nullifies the positive charge required for catalysis, and thereby acts as a natural inhibitor. Lectin subunits of RIPs have two active sugar-binding sites present in 1alpha- and 2gamma-subdomains. A third functionally active site has been identified in the 1beta-subdomain of HmRIP. The 1beta-site is active despite the absence of conserved polar sugar-binding residues. Loss of these residues is compensated by the following: (i) the presence of an extended site where the penultimate sugar also interacts with the protein; (ii) the interactions of galactose with the protein main chain carbonyl and amide nitrogen atoms; (iii) the presence of a well defined pocket encircled by four walls; and (iv) a favorable stacking of the galactose ring with Tyr(66) besides the conserved Phe(75). The mode of sugar binding is also distinct at the 1alpha and 2gamma sugar-binding sites.
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Affiliation(s)
- Vandana Mishra
- Department of Biophysics, All India Institute of Medical Sciences, New Delhi 110 029, India
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Sharma RS, Mohmmed A, Mishra V, Babu CR. Diversity in a promiscuous group of rhizobia from three Sesbania spp. colonizing ecologically distinct habitats of the semi-arid Delhi region. Res Microbiol 2005; 156:57-67. [PMID: 15636748 DOI: 10.1016/j.resmic.2004.08.009] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2004] [Accepted: 08/17/2004] [Indexed: 10/26/2022]
Abstract
Sesbania-rhizobia associations have immense significance in soil amelioration programs for diverse habitats. Diversity in symbiotic properties, LPS profiles, Sym plasmid and rhizobiophage sensitivity of 28 root- and stem-nodulating bacterial isolates of three Sesbania species (S. sesban, S. aegyptica and S. rostrata) inhabiting six ecologically distinct sites of semi-arid Delhi region was analyzed. The isolates were highly promiscuous among the symbiotic partners (Sesbania spp.). The root nodules formed by all the isolates were morphologically similar but they differed in their symbiotic efficiency and effectiveness. 16S rDNA sequence analyses revealed that root nodule isolates of sesbanias belong to diverse rhizobial taxa (Sinorhizobium saheli, S. meliloti, Rhizobium huautlense) whereas stem-nodule isolates were strictly Azorhizobium caulinodans. Sinorhizobium spp. seem to dominate as microsymbiont partner of Sesbania in the Delhi region. The genetic diversity revealed by cluster analyses based on NPC-PCR reflects sorting of isolates across the ecological gradient. Parallel diversity was also observed in the grouping based on LPS profiles and sym plasmid (NPC-PCR). Segregation of different rhizobial taxa into distinct types/clusters based on LPS and NPC-PCR analyses suggest its significance in the circumscription of the taxa. However, subtypes and subclusters showed their sorting across the ecological gradients. Sesbania rhizobia showed extremely high specificity to rhizobiophages. Enormous diversity in LPS profiles and high specificity of rhizobiophages might be the result of environmental selection pressures operating in ecologically distinct habitats. The ability of sesbanias to enter into effective symbioses with different rhizobial taxa and colonize diverse habitats with various biotic and abiotic stresses appears to contribute to its wide ecological amplitude.
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MESH Headings
- Alphaproteobacteria/chemistry
- Alphaproteobacteria/classification
- Alphaproteobacteria/genetics
- Alphaproteobacteria/isolation & purification
- Azorhizobium caulinodans/chemistry
- Azorhizobium caulinodans/classification
- Azorhizobium caulinodans/genetics
- Azorhizobium caulinodans/isolation & purification
- Bacteriophages/growth & development
- Biodiversity
- DNA Fingerprinting
- DNA, Bacterial/chemistry
- DNA, Bacterial/genetics
- DNA, Bacterial/isolation & purification
- DNA, Ribosomal/chemistry
- DNA, Ribosomal/isolation & purification
- Ecosystem
- Fabaceae/microbiology
- Genes, rRNA
- India
- Lipopolysaccharides/analysis
- Lipopolysaccharides/isolation & purification
- Molecular Sequence Data
- Phylogeny
- Plant Roots/microbiology
- Plant Stems/microbiology
- Plasmids
- RNA, Bacterial/genetics
- RNA, Ribosomal, 16S/genetics
- Rhizobium/chemistry
- Rhizobium/classification
- Rhizobium/genetics
- Rhizobium/isolation & purification
- Sequence Analysis, DNA
- Sinorhizobium/chemistry
- Sinorhizobium/classification
- Sinorhizobium/genetics
- Sinorhizobium/isolation & purification
- Symbiosis
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Affiliation(s)
- Radhey Shyam Sharma
- Centre for Environmental Management of Degraded Ecosystems, School of Environmental Studies, University of Delhi, Delhi 110 007, India.
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