1
|
Seed Storage Protein, Functional Diversity and Association with Allergy. ALLERGIES 2023. [DOI: 10.3390/allergies3010003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
Plants are essential for humans as they serve as a source of food, fuel, medicine, oils, and more. The major elements that are utilized for our needs exist in storage organs, such as seeds. These seeds are rich in proteins, show a broad spectrum of physiological roles, and are classified based on their sequence, structure, and conserved motifs. With the improvements to our knowledge of the basic sequence and our structural understanding, we have acquired better insights into seed proteins and their role. However, we still lack a systematic analysis towards understanding the functional diversity associated within each family and their associations with allergy. This review puts together the information about seed proteins, their classification, and diverse functional roles along with their associations with allergy.
Collapse
|
2
|
Comparative Proteomic Analysis of Drug Trichosanthin Addition to BeWo Cell Line. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27051603. [PMID: 35268705 PMCID: PMC8911981 DOI: 10.3390/molecules27051603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/01/2021] [Revised: 02/11/2022] [Accepted: 02/16/2022] [Indexed: 11/17/2022]
Abstract
Trichosanthin (TCS) is a traditional Chinese herbal medicine used to treat some gynecological diseases. Its effective component has diverse biological functions, including antineoplastic activity. The human trophoblast cell line BeWo was chosen as an experimental model for in vitro testing of a drug screen for anticancer properties of TCS. The MTT method was used in this study to get a primary screen result. The result showed that 100 mM had the best IC50 value. Proteomics analysis was then performed for further investigation of the drug effect of TCS on the BeWo cell line. In this differential proteomic expression analysis, the total proteins extracted from the BeWo cell line and their protein expression level after the drug treatment were compared by 2DE. Then, 24 unique three-fold differentially expressed proteins (DEPs) were successfully identified by MALDI-TOF/TOF MS. Label-free proteomics was run as a complemental method for the same experimental procedure. There are two proteins that were identified in both the 2DE and label-free methods. Among those identified proteins, bioinformatics analysis showed the importance of pathway and signal transduction and gives us the potential possibility for the disease treatment hypothesis.
Collapse
|
3
|
Lu JQ, Wong KB, Shaw PC. A Sixty-Year Research and Development of Trichosanthin, a Ribosome-Inactivating Protein. Toxins (Basel) 2022; 14:178. [PMID: 35324675 PMCID: PMC8950148 DOI: 10.3390/toxins14030178] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2022] [Revised: 02/23/2022] [Accepted: 02/25/2022] [Indexed: 02/04/2023] Open
Abstract
Tian Hua Fen, a herbal powder extract that contains trichosanthin (TCS), was used as an abortifacient in traditional Chinese medicine. In 1972, TCS was purified to alleviate the side effects. Because of its clinical applications, TCS became one of the most active research areas in the 1960s to the 1980s in China. These include obtaining the sequence information in the 1980s and the crystal structure in 1995. The replication block of TCS on human immunodeficiency virus in lymphocytes and macrophages was found in 1989 and started a new chapter of its development. Clinical studies were subsequently conducted. TCS was also found to have the potential for gastric and colorectal cancer treatment. Studies on its mechanism showed TCS acts as an rRNA N-glycosylase (EC 3.2.2.22) by hydrolyzing and depurinating A-4324 in α-sarcin/ricin loop on 28S rRNA of rat ribosome. Its interaction with acidic ribosomal stalk proteins was revealed in 2007, and its trafficking in mammalian cells was elucidated in the 2000s. The adverse drug reactions, such as inducing immune responses, short plasma half-life, and non-specificity, somehow became the obstacles to its usage. Immunotoxins, sequence modification, or coupling with polyethylene glycerol and dextran were developed to improve the pharmacological properties. TCS has nicely shown the scientific basis of traditional Chinese medicine and how its research and development have expanded the knowledge and applications of ribosome-inactivating proteins.
Collapse
Affiliation(s)
- Jia-Qi Lu
- Centre for Protein Science and Crystallography, School of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong, China; (J.-Q.L.); (K.-B.W.)
| | - Kam-Bo Wong
- Centre for Protein Science and Crystallography, School of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong, China; (J.-Q.L.); (K.-B.W.)
| | - Pang-Chui Shaw
- Centre for Protein Science and Crystallography, School of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong, China; (J.-Q.L.); (K.-B.W.)
- Li Dak Sum Yip Yio Chin R&D Centre for Chinese Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong, China
| |
Collapse
|
4
|
Strategies to package recombinant Adeno-Associated Virus expressing the N-terminal gasdermin domain for tumor treatment. Nat Commun 2021; 12:7155. [PMID: 34887423 PMCID: PMC8660823 DOI: 10.1038/s41467-021-27407-0] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Accepted: 11/11/2021] [Indexed: 12/29/2022] Open
Abstract
Pyroptosis induced by the N-terminal gasdermin domain (GSDMNT) holds great potential for anti-tumor therapy. However, due to the extreme cytoxicity of GSDMNT, it is challenging to efficiently produce and deliver GSDMNT into tumor cells. Here, we report the development of two strategies to package recombinant adeno-associated virus (rAAV) expressing GSDMNT: 1) drive the expression of GSDMNT by a mammal specific promoter and package the virus in Sf9 insect cells to avoid its expression; 2) co-infect rAAV-Cre to revert and express the double-floxed inverted GSDMNT. We demonstrate that these rAAVs can induce pyroptosis and prolong survival in preclinical cancer models. The oncolytic-viruses induce pyroptosis and evoke a robust immune-response. In a glioblastoma model, rAAVs temporarily open the blood-brain barrier and recruit tumor infiltrating lymphocytes into the brain. The oncolytic effect is further improved in combination with anti-PD-L1. Together, our strategies efficiently produce and deliver GSDMNT into tumor cells and successfully induce pyroptosis, which can be exploited for anti-tumor therapy. Pyroptosis, a gasdermin-mediated inflammatory cell death, could be harnessed therapeutically to improve response to cancer immunotherapy. Here the authors report the development of recombinant adeno-associated viruses to deliver the pore-forming N-terminal domain of gasdermin into cancer cells, promoting pyroptosis and anti-tumor immune responses in preclinical cancer models.
Collapse
|
5
|
Citores L, Iglesias R, Ferreras JM. Antiviral Activity of Ribosome-Inactivating Proteins. Toxins (Basel) 2021; 13:80. [PMID: 33499086 PMCID: PMC7912582 DOI: 10.3390/toxins13020080] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Revised: 01/14/2021] [Accepted: 01/20/2021] [Indexed: 12/13/2022] Open
Abstract
Ribosome-inactivating proteins (RIPs) are rRNA N-glycosylases from plants (EC 3.2.2.22) that inactivate ribosomes thus inhibiting protein synthesis. The antiviral properties of RIPs have been investigated for more than four decades. However, interest in these proteins is rising due to the emergence of infectious diseases caused by new viruses and the difficulty in treating viral infections. On the other hand, there is a growing need to control crop diseases without resorting to the use of phytosanitary products which are very harmful to the environment and in this respect, RIPs have been shown as a promising tool that can be used to obtain transgenic plants resistant to viruses. The way in which RIPs exert their antiviral effect continues to be the subject of intense research and several mechanisms of action have been proposed. The purpose of this review is to examine the research studies that deal with this matter, placing special emphasis on the most recent findings.
Collapse
Affiliation(s)
| | | | - José M. Ferreras
- Department of Biochemistry and Molecular Biology and Physiology, Faculty of Sciences, University of Valladolid, E-47011 Valladolid, Spain; (L.C.); (R.I.)
| |
Collapse
|
6
|
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.
Collapse
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
| |
Collapse
|
7
|
Lu JQ, Zhu ZN, Zheng YT, Shaw PC. Engineering of Ribosome-inactivating Proteins for Improving Pharmacological Properties. Toxins (Basel) 2020; 12:toxins12030167. [PMID: 32182799 PMCID: PMC7150887 DOI: 10.3390/toxins12030167] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Revised: 03/05/2020] [Accepted: 03/06/2020] [Indexed: 12/23/2022] Open
Abstract
Ribosome-inactivating proteins (RIPs) are N-glycosidases, which depurinate a specific adenine residue in the conserved α-sarcin/ricin loop (α-SRL) of rRNA. This loop is important for anchoring elongation factor (EF-G for prokaryote or eEF2 for eukaryote) in mRNA translocation. Translation is inhibited after the attack. RIPs therefore may have been applied for anti-cancer, and anti-virus and other therapeutic applications. The main obstacles of treatment with RIPs include short plasma half-life, non-selective cytotoxicity and antigenicity. This review focuses on the strategies used to improve the pharmacological properties of RIPs on human immunodeficiency virus (HIV) and cancers. Coupling with polyethylene glycol (PEG) increases plasma time and reduces antigenicity. RIPs conjugated with antibodies to form immunotoxins increase the selective toxicity to target cells. The prospects for future development on the engineering of RIPs for improving their pharmacological properties are also discussed.
Collapse
Affiliation(s)
- Jia-Qi Lu
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong 99077, China; (J.-Q.L.); (Z.-N.Z.)
| | - Zhen-Ning Zhu
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong 99077, China; (J.-Q.L.); (Z.-N.Z.)
| | - Yong-Tang Zheng
- Key Laboratory of Animal Models and Human Disease Mechanisms, National Kunming High level Biosafety Research Center for Non-human Primates, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming 650223, Yunnan, China;
| | - Pang-Chui Shaw
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong 99077, China; (J.-Q.L.); (Z.-N.Z.)
- Correspondence:
| |
Collapse
|
8
|
Min B, Kim S, Oh YL, Kong WS, Park H, Cho H, Jang KY, Kim JG, Choi IG. Genomic discovery of the hypsin gene and biosynthetic pathways for terpenoids in Hypsizygus marmoreus. BMC Genomics 2018; 19:789. [PMID: 30382831 PMCID: PMC6211417 DOI: 10.1186/s12864-018-5159-y] [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: 06/07/2018] [Accepted: 10/11/2018] [Indexed: 11/17/2022] Open
Abstract
Background Hypsizygus marmoreus (Beech mushroom) is a popular ingredient in Asian cuisine. The medicinal effects of its bioactive compounds such as hypsin and hypsiziprenol have been reported, but the genetic basis or biosynthesis of these components is unknown. Results In this study, we sequenced a reference strain of H. marmoreus (Haemi 51,987–8). We evaluated various assembly strategies, and as a result the Allpaths and PBJelly produced the best assembly. The resulting genome was 42.7 Mbp in length and annotated with 16,627 gene models. A putative gene (Hypma_04324) encoding the antifungal and antiproliferative hypsin protein with 75% sequence identity with the previously known N-terminal sequence was identified. Carbohydrate active enzyme analysis displayed the typical feature of white-rot fungi where auxiliary activity and carbohydrate-binding modules were enriched. The genome annotation revealed four terpene synthase genes responsible for terpenoid biosynthesis. From the gene tree analysis, we identified that terpene synthase genes can be classified into six clades. Four terpene synthase genes of H. marmoreus belonged to four different groups that implies they may be involved in the synthesis of different structures of terpenes. A terpene synthase gene cluster was well-conserved in Agaricomycetes genomes, which contained known biosynthesis and regulatory genes. Conclusions Genome sequence analysis of this mushroom led to the discovery of the hypsin gene. Comparative genome analysis revealed the conserved gene cluster for terpenoid biosynthesis in the genome. These discoveries will further our understanding of the biosynthesis of medicinal bioactive molecules in this edible mushroom. Electronic supplementary material The online version of this article (10.1186/s12864-018-5159-y) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
- Byoungnam Min
- Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, 145 Anam-ro, Seongbuk-Gu, Seoul, 02841, Korea
| | - Seunghwan Kim
- Genomics Division, National Institute of Agricultural Sciences, Rural Development Administration (RDA), Jeonju, 54874, Korea
| | - Youn-Lee Oh
- Mushroom Division, National Institute of Horticultural and Herbal Science (NHHS), Rural Development Administration (RDA), Eumseong, 27709, Korea
| | - Won-Sik Kong
- Mushroom Division, National Institute of Horticultural and Herbal Science (NHHS), Rural Development Administration (RDA), Eumseong, 27709, Korea
| | - Hongjae Park
- Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, 145 Anam-ro, Seongbuk-Gu, Seoul, 02841, Korea
| | - Heejung Cho
- Genomics Division, National Institute of Agricultural Sciences, Rural Development Administration (RDA), Jeonju, 54874, Korea
| | - Kab-Yeul Jang
- Mushroom Division, National Institute of Horticultural and Herbal Science (NHHS), Rural Development Administration (RDA), Eumseong, 27709, Korea
| | - Jeong-Gu Kim
- Genomics Division, National Institute of Agricultural Sciences, Rural Development Administration (RDA), Jeonju, 54874, Korea.
| | - In-Geol Choi
- Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, 145 Anam-ro, Seongbuk-Gu, Seoul, 02841, Korea.
| |
Collapse
|
9
|
Khandaker M, Akter S, Imam MZ. Trichosanthes dioica Roxb.: A vegetable with diverse pharmacological properties. FOOD SCIENCE AND HUMAN WELLNESS 2018. [DOI: 10.1016/j.fshw.2017.12.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
|
10
|
Gao J, Yao S, Wang Y, Hou Z, Yang C, Song H. Hydrolysis of trichosanthin (TCS) catalyzed by imidazolium-based ionic liquids in heating and microwave-assisted modes. NEW J CHEM 2018. [DOI: 10.1039/c8nj01876f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two modes of TCS hydrolysis based on ILs were compared and a higher degree of hydrolysis can be obtained compared to common catalysts.
Collapse
Affiliation(s)
- Jing Gao
- Department of Pharmaceutical and Biological Engineering
- Sichuan University
- Chengdu 610065
- China
| | - Shun Yao
- Department of Pharmaceutical and Biological Engineering
- Sichuan University
- Chengdu 610065
- China
| | - Yu Wang
- Department of Pharmaceutical and Biological Engineering
- Sichuan University
- Chengdu 610065
- China
| | - Zhengbo Hou
- Department of Pharmaceutical and Biological Engineering
- Sichuan University
- Chengdu 610065
- China
| | - Chang Yang
- Inner Mongolia Mengniu Dairy Industry (Group) Co., LTD
- Shengle Economical District
- Helingeer
- Huhhot Inner Mongolia
- China
| | - Hang Song
- Department of Pharmaceutical and Biological Engineering
- Sichuan University
- Chengdu 610065
- China
| |
Collapse
|
11
|
Serna N, Sánchez-García L, Unzueta U, Díaz R, Vázquez E, Mangues R, Villaverde A. Protein-Based Therapeutic Killing for Cancer Therapies. Trends Biotechnol 2017; 36:318-335. [PMID: 29246477 DOI: 10.1016/j.tibtech.2017.11.007] [Citation(s) in RCA: 80] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2017] [Revised: 11/19/2017] [Accepted: 11/20/2017] [Indexed: 02/07/2023]
Abstract
The treatment of some high-incidence human diseases is based on therapeutic cell killing. In cancer this is mainly achieved by chemical drugs that are systemically administered to reach effective toxic doses. As an innovative alternative, cytotoxic proteins identified in nature can be adapted as precise therapeutic agents. For example, individual toxins and venom components, proapoptotic factors, and antimicrobial peptides from bacteria, animals, plants, and humans have been engineered as highly potent drugs. In addition to the intrinsic cytotoxic activities of these constructs, their biological fabrication by DNA recombination allows the recruitment, in single pharmacological entities, of diverse functions of clinical interest such as specific cell-surface receptor binding, self-activation, and self-assembling as nanoparticulate materials, with wide applicability in cell-targeted oncotherapy and theragnosis.
Collapse
Affiliation(s)
- Naroa Serna
- Institut de Biotecnologia i de Biomedicina, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Spain; Departament de Genètica i de Microbiologia, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Spain; Centro de Investigación Biomédica en Red (CIBER) de Bioingeniería, Biomateriales y Nanomedicina, 08193 Cerdanyola del Vallès, Spain
| | - Laura Sánchez-García
- Institut de Biotecnologia i de Biomedicina, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Spain; Departament de Genètica i de Microbiologia, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Spain; Centro de Investigación Biomédica en Red (CIBER) de Bioingeniería, Biomateriales y Nanomedicina, 08193 Cerdanyola del Vallès, Spain
| | - Ugutz Unzueta
- Centro de Investigación Biomédica en Red (CIBER) de Bioingeniería, Biomateriales y Nanomedicina, 08193 Cerdanyola del Vallès, Spain; Institut d'Investigacions Biomèdiques Sant Pau and Josep Carreras Research Institute, Hospital de la Santa Creu i Sant Pau, 08025 Barcelona, Spain
| | - Raquel Díaz
- Institut de Biotecnologia i de Biomedicina, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Spain; Departament de Genètica i de Microbiologia, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Spain; Centro de Investigación Biomédica en Red (CIBER) de Bioingeniería, Biomateriales y Nanomedicina, 08193 Cerdanyola del Vallès, Spain
| | - Esther Vázquez
- Institut de Biotecnologia i de Biomedicina, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Spain; Departament de Genètica i de Microbiologia, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Spain; Centro de Investigación Biomédica en Red (CIBER) de Bioingeniería, Biomateriales y Nanomedicina, 08193 Cerdanyola del Vallès, Spain
| | - Ramón Mangues
- Centro de Investigación Biomédica en Red (CIBER) de Bioingeniería, Biomateriales y Nanomedicina, 08193 Cerdanyola del Vallès, Spain; Institut d'Investigacions Biomèdiques Sant Pau and Josep Carreras Research Institute, Hospital de la Santa Creu i Sant Pau, 08025 Barcelona, Spain.
| | - Antonio Villaverde
- Institut de Biotecnologia i de Biomedicina, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Spain; Departament de Genètica i de Microbiologia, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Spain; Centro de Investigación Biomédica en Red (CIBER) de Bioingeniería, Biomateriales y Nanomedicina, 08193 Cerdanyola del Vallès, Spain.
| |
Collapse
|
12
|
Secondary Metabolite Production in Transgenic Hairy Root Cultures of Cucurbits. REFERENCE SERIES IN PHYTOCHEMISTRY 2017. [PMCID: PMC7123301 DOI: 10.1007/978-3-319-28669-3_6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Cucurbits are important group of vegetables due to their nutritional significance and are also used for valuable traditional medicine. The infection of plants by Agrobacterium rhizogenes results in a hairy root (HR) phenotype characterized by rapid growth in hormone-free medium, an unusual ageotropism and extensive lateral branching. These genetically transformed root cultures (hairy roots) can produce levels of secondary metabolites comparable to that of intact plants. Hairy root cultures offer promise for high production and productivity of valuable secondary metabolites in many plants. High stability and productivity features allow the exploitation of HRs as valuable biotechnological tool for the production of plant secondary metabolites. While these chemical compounds are employed by plants for interactions with their environment, humans have long since explored and exploited plant secondary metabolites for medicinal and practical uses. The main constraint for commercial exploitation of hairy root cultivations is the development and scaling up of appropriate reactor vessels (bioreactors) that permit the growth of interconnected tissues normally unevenly distributed throughout the vessel. Emphasis has focused on designing appropriate bioreactors suitable to culture the delicate and sensitive plant hairy roots. To this end, hairy root culture presents an excellent platform for producing valuable secondary metabolites. For these reasons, this chapter describes the establishment of hairy roots and production of secondary metabolites from hairy roots of cucurbits and also phytochemicals uses for biological activity.
Collapse
|
13
|
A novel trichosanthin fusion protein with increased cytotoxicity to tumor cells. Biotechnol Lett 2016; 39:71-78. [DOI: 10.1007/s10529-016-2222-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2016] [Accepted: 09/15/2016] [Indexed: 10/20/2022]
|
14
|
Ajji PK, Walder K, Puri M. Functional Analysis of a Type-I Ribosome Inactivating Protein Balsamin from Momordica balsamina with Anti-Microbial and DNase Activity. PLANT FOODS FOR HUMAN NUTRITION (DORDRECHT, NETHERLANDS) 2016; 71:265-71. [PMID: 27319013 DOI: 10.1007/s11130-016-0555-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Ribosome inactivating proteins (RIPs) have received considerable attention in biomedical research because of their unique activities towards tumor and virus-infected cells. We extracted balsamin, a type-I RIP, from Momordica balsamina. In the present study, a detailed investigation on DNase activity, antioxidant capacity and antibacterial activity was conducted using purified balsamin. DNase-like activity of balsamin towards plasmid DNA was pH, incubation time and temperature dependent. Moreover, the presence of Mg(2+) (10-50 mM) influenced the DNA cleavage activity. Balsamin also demonstrated reducing power and a capacity to scavenge free radicals in a dose dependent manner. Furthermore, the protein exhibited antibacterial activity against Staphylococcus aureus, Salmonella enterica, Staphylococcus epidermidis and Escherichia coli, which suggests potential utility of balsamin as a nutraceutical.
Collapse
Affiliation(s)
- Parminder Kaur Ajji
- Bioprocessing Laboratory, Centre for Chemistry and Biotechnology, School of Life and Environment Sciences, Deakin University, 75 Pigdons Road, Waurn Ponds, Geelong, 3220, Victoria, Australia
- Metabolic Research Unit, School of Medicine, Deakin University, Waurn Ponds, 75 Pigdons Road, Locked Bag 20000, Geelong, VIC, 3220, Australia
| | - Ken Walder
- Metabolic Research Unit, School of Medicine, Deakin University, Waurn Ponds, 75 Pigdons Road, Locked Bag 20000, Geelong, VIC, 3220, Australia
| | - Munish Puri
- Bioprocessing Laboratory, Centre for Chemistry and Biotechnology, School of Life and Environment Sciences, Deakin University, 75 Pigdons Road, Waurn Ponds, Geelong, 3220, Victoria, Australia.
| |
Collapse
|
15
|
Lu YZ, Li PF, Li YZ, Luo F, Guo C, Lin B, Cao XW, Zhao J, Wang FJ. Enhanced anti-tumor activity of trichosanthin after combination with a human-derived cell-penetrating peptide, and a possible mechanism of activity. Fitoterapia 2016; 112:183-90. [DOI: 10.1016/j.fitote.2016.03.019] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2016] [Revised: 03/27/2016] [Accepted: 03/28/2016] [Indexed: 12/13/2022]
|
16
|
Rekha K, Thiruvengadam M. Secondary Metabolite Production in Transgenic Hairy Root Cultures of Cucurbits. TRANSGENESIS AND SECONDARY METABOLISM 2016:1-27. [DOI: 10.1007/978-3-319-27490-4_6-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2016] [Accepted: 05/06/2016] [Indexed: 06/16/2023]
|
17
|
Sánchez M, Scirè A, Tanfani F, Ausili A. The thermal unfolding of the ribosome-inactivating protein saporin-S6 characterized by infrared spectroscopy. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2015; 1854:1357-64. [DOI: 10.1016/j.bbapap.2015.06.006] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2015] [Revised: 06/08/2015] [Accepted: 06/17/2015] [Indexed: 10/23/2022]
|
18
|
Wu W, Sun R. Toxicological studies on plant proteins: a review. J Appl Toxicol 2011; 32:377-86. [PMID: 22183867 DOI: 10.1002/jat.1780] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2011] [Revised: 10/08/2011] [Accepted: 10/27/2011] [Indexed: 11/08/2022]
Abstract
Nowadays, toxicological studies are contributing to human health more than ever. Reports on the toxicological studies of plant proteins, which are continuously growing in number in the literature, have been reviewed. Two important aspects are discussed: dietary safety evaluation, including toxicity tests and the maximum daily intake allowance, and the appropriate proportion in our daily diets of proteins from traditional foods and of new proteins from plant sources not traditionally employed as foods. Water hyacinth leaf proteins, sweet lupin proteins and canola proteins have not been shown to be toxic, although they are not traditionally employed as food proteins. These findings are very important for exploiting valuable new protein sources that are suitable for human or animal consumption and applicable to the food industry. Acutely toxic proteins, including lectins, ribosome-inactivating proteins, inhibitors of proteolytic enzymes and glycohydro-lases, have been isolated from plant materials and identified. Their toxicities and molecular characteristics have been described. The toxicity of proteins depends upon their specific native structures. Once they are denatured by appropriate treatment, such as heating, their toxicity can be reduced or even eliminated. These findings indicate that raw materials that contain this kind of toxic protein are not edible. However, after proper processing, they may be suitable for human or animal consumption. Although the toxicities of type 2 ribosome-inactivating proteins reported by different authors vary, the maximum dosages are still trace amounts.
Collapse
Affiliation(s)
- Wenbiao Wu
- College of Food Science, Southwest University, 216 Tian Sheng Qiao, Beibei, Chongqing, People's Republic of China.
| | | |
Collapse
|
19
|
Choudhary NL, Yadav OP, Lodha ML. Ribonuclease, deoxyribonuclease, and antiviral activity of Escherichia coli-expressed Bougainvillea xbuttiana antiviral protein 1. BIOCHEMISTRY (MOSCOW) 2011; 73:273-7. [DOI: 10.1134/s000629790803005x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
20
|
Toxin-based therapeutic approaches. Toxins (Basel) 2010; 2:2519-83. [PMID: 22069564 PMCID: PMC3153180 DOI: 10.3390/toxins2112519] [Citation(s) in RCA: 92] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2010] [Revised: 10/25/2010] [Accepted: 10/26/2010] [Indexed: 01/08/2023] Open
Abstract
Protein toxins confer a defense against predation/grazing or a superior pathogenic competence upon the producing organism. Such toxins have been perfected through evolution in poisonous animals/plants and pathogenic bacteria. Over the past five decades, a lot of effort has been invested in studying their mechanism of action, the way they contribute to pathogenicity and in the development of antidotes that neutralize their action. In parallel, many research groups turned to explore the pharmaceutical potential of such toxins when they are used to efficiently impair essential cellular processes and/or damage the integrity of their target cells. The following review summarizes major advances in the field of toxin based therapeutics and offers a comprehensive description of the mode of action of each applied toxin.
Collapse
|
21
|
Jin SW, Xiang BP, Cao BX, Wang Y. Trichobitacin - a new ribosome-inactivating protein I. The isolation, physicochemical and biological properties of trichobitacin. CHINESE J CHEM 2010. [DOI: 10.1002/cjoc.19970150211] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
22
|
Zhao W, Feng D, Sun S, Han T, Sui S. The anti-viral protein of trichosanthin penetrates into human immunodeficiency virus type 1. Acta Biochim Biophys Sin (Shanghai) 2010; 42:91-7. [PMID: 20119629 DOI: 10.1093/abbs/gmp111] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Trichosanthin (TCS) is a type I ribosome-inactivating protein with potent inhibitory activity against human immunodeficiency virus type 1, and has been clinically applied in acquired immunodeficiency syndrome (AIDS) therapy. Previous studies revealed that TCS recognized human immunodeficiency virus type 1 (HIV-1) particles. Here, we investigated the physical relationship between TCS and HIV-1 particles, and demonstrated that TCS penetrates into viral particles, where it is protected from various protease digestion. The penetration of TCS exerts no obvious effect on viral integrity. FYY140-142, D176, and K177 were identified as key amino acid residues for the membranetranslocation process. Moreover, TCS penetrated into HIV-1 virions showed potent anti-viral activity. Overall, the observations suggest that the penetration of TCS into HIV-1 particles may be important for eliminating the virus.
Collapse
|
23
|
|
24
|
Sha O, Yew DTW, Cho EYP, Ng TB, Yuan L, Kwong WH. Mechanism of the specific neuronal toxicity of a type I ribosome-inactivating protein, trichosanthin. Neurotox Res 2009; 18:161-72. [PMID: 19851719 DOI: 10.1007/s12640-009-9122-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2009] [Revised: 09/24/2009] [Accepted: 09/29/2009] [Indexed: 11/24/2022]
Abstract
The aim was to study the mechanism of neuronal toxicity, the cellular pathway, and the glial cell reactions induced by trichosanthin (TCS), a type I ribosome-inactivating protein (RIP). Ricin A chain (RTA) was included for comparison. TCS, RTA, and fluorescein isothiocyanate (FITC)-labeled TCS and RTA were separately injected into rat eyes. Saline or pure FITC was used as the control. Electron microscopy, confocal microscopy, and lectin and immunohistochemical staining were used to study the neurotoxic mechanism. TCS mainly induced apoptosis by causing degeneration of the mitochondria. TCS was able to enter the Müller and pigment cells. It caused a change in cell number of the following types of glial cells: a decrease in Müller cells, an increase in astrocytes, and little change in microglia. In contrast, RTA mainly induced necrosis and entered vascular endothelial cells. Astrocyte and microglia reactions were stronger in the RTA-treated retinas than those in the TCS-treated retinas. In conclusion, TCS appears to selectively enter and destroy Müller and pigment epithelia cells, which subsequently induce the death of photoreceptors. Degeneration of mitochondria is involved in the pathways of apoptosis of the photoreceptors caused by TCS. In sharp contrast, RTA can enter vascular endothelial cells and damage the vascular endothelium, resulting in retinitis and necrosis.
Collapse
Affiliation(s)
- Ou Sha
- Faculty of Medicine, School of Biomedical Sciences, The Chinese University of Hong Kong, Shatin NT, Hong Kong, China.
| | | | | | | | | | | |
Collapse
|
25
|
Zhao WL, Feng D, Wu J, Sui SF. Trichosanthin inhibits integration of human immunodeficiency virus type 1 through depurinating the long-terminal repeats. Mol Biol Rep 2009; 37:2093-8. [PMID: 19669933 DOI: 10.1007/s11033-009-9668-2] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2009] [Accepted: 07/27/2009] [Indexed: 10/20/2022]
Abstract
Trichosanthin (TCS) is a type I ribosome-inactivating protein with potent inhibitory activity against human immunodeficiency virus type 1. However, the anti-viral mechanism remains elusive. By a well-accepted HIV-1 integration assay, we demonstrated that TCS prevents HIV-1 DNA integration in a dose dependent manner in cell culture. At the same condition, TCS fails to induce obvious cytotoxicity and is also unable to interference viral early events such as viral entry, uncoating or reverse transcription. The HIV-1 integrase can integrate HIV-1 long-terminal repeats into cellular chromosome. The interaction of TCS with these viral integration components was also examined, indicating that TCS does not interact with HIV-1 integrase by the GST-pull down assay, but binds to the long terminal repeats in a transient manner. We further revealed that TCS can efficiently depurinate HIV-1 long-terminal repeats, which may be responsible for the inhibitory activity on HIV-1 integration. In conclusion, we elucidated that TCS specifically inhibits HIV-1 integration by depurinating the long-terminal repeats.
Collapse
Affiliation(s)
- Wen-Long Zhao
- State Key Laboratory of Biomembrane and Membrane Biotechnology, Department of Biological Sciences and Biotechnology, Tsinghua University, 100084, Beijing, People's Republic of China
| | | | | | | |
Collapse
|
26
|
Moon SS, Rahman AA, Kim JY, Kee SH. Hanultarin, a cytotoxic lignan as an inhibitor of actin cytoskeleton polymerization from the seeds of Trichosanthes kirilowii. Bioorg Med Chem 2008; 16:7264-9. [PMID: 18603435 DOI: 10.1016/j.bmc.2008.06.032] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2008] [Revised: 06/17/2008] [Accepted: 06/18/2008] [Indexed: 11/17/2022]
Abstract
Bioactivity-directed fractionation of extracts from the seeds of Trichosanthes kirilowii led to the isolation of (-)-1-O-feruloylsecoisolariciresinol (2), named hanultarin, In addition, four known lignans were also isolated, including (-)-secoisolariciresinol (1), 1,4-O-diferuloylsecoisolariciresinol (3), (-)-pinoresinol (4), and 4-ketopinoresinol (5). Their structures were elucidated on the basis of spectroscopic data. Compounds 2 and 3 exhibited strong cytotoxic effects against human lung carcinoma A549 cells, melanoma SK-Mel-2 cells, and mouse skin melanoma B16F1 cells with IC(50) ranges of 3-13 microg/mL. Compound 2 showed an inhibitory effect on the polymerization of the actin cytoskeleton in normal epidermal keratinocyte (HaCaT cells), suggesting unique biological properties of compound 2 compared to those of the other isolates.
Collapse
Affiliation(s)
- Surk-Sik Moon
- Department of Chemistry, Kongju National University, 182 Shinkwangdong, Kongju 314-701, Republic of Korea.
| | | | | | | |
Collapse
|
27
|
An Q, Lei Y, Jia N, Zhang X, Bai Y, Yi J, Chen R, Xia A, Yang J, Wei S, Cheng X, Fan A, Mu S, Xu Z. Effect of site-directed PEGylation of trichosanthin on its biological activity, immunogenicity, and pharmacokinetics. ACTA ACUST UNITED AC 2007; 24:643-9. [PMID: 18023612 DOI: 10.1016/j.bioeng.2007.10.002] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2007] [Accepted: 10/19/2007] [Indexed: 10/22/2022]
Abstract
Trichosanthin (TCS) is a type I ribosome-inactivating protein (RIP) with multiple biological and pharmacological activities. It has been approved effective in the clinical treatment of AIDS and tumor, but its strong immunogenicity and short plasma half-life have limited the clinical administration. To reduce the immunogenicity and prolong the plasma half-life of this compound, three TCS muteins (M(1), M(2) and M(3)) and two PEGylated TCS muteins (PM(1) and PM(2)) were constructed by site-directed mutagenesis and PEGylation, respectively. Compared with the unmodified TCS, both PEGylated TCS showed a 3- to 4-fold decrease in immunogenicity, a 0.5- to 0.8-fold decrease in non-specific toxicity, and a 4.5- to 6-fold increase in plasma half-life. But there is a problem of activity reduction. The increased circulating half-life in vivo may compensate for the reduced activity. Together with the other benefits of PEGylation such as reduced immunogenicity and toxicity, it is worthwhile to further explore the potential application of the PEGylated TCS as a better therapeutic agent for AIDS and tumor.
Collapse
Affiliation(s)
- Qunxing An
- Department of Blood Transfusion, Xijing Hospital, Fourth Military Medical University, Xi'an 710033, China
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
28
|
Zhou H, Jiao Z, Pan J, Hong J, Tao J, Li N, Zhou Y, Zhang J, Chou KY. Immune suppression via IL-4/IL-10-secreting T cells: A nontoxic property of anti-HIV agent Trichosanthin. Clin Immunol 2007; 122:312-22. [PMID: 17182284 DOI: 10.1016/j.clim.2006.11.001] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2006] [Revised: 10/11/2006] [Accepted: 11/02/2006] [Indexed: 01/28/2023]
Abstract
The activity of Trichosanthin (Tk) has been attributed to its toxicity since this plant protein was used as an anti-HIV agent. However, in this study strong inhibition of human lymphoproliferation to soluble and allogeneic antigens was induced by Tk at 0.005-0.5 microg/ml without causing cell damages including apoptosis. The suppression was dependent on the presence of monocytes that are able to internalize and process Tk molecules as exogenous antigens. Among 39 Tk-primed T cell lines established, those with strong suppressive activity were CD8(+) TCRalphabeta(+) with type 2 cytokine secretion profile. Depletion of CD8 cells from total T cells or blocking expression of HLA-DQ molecules diminished Tk's inhibitory activity. In addition, healthy subjects with HLA haplotype DRB1*0301-DQA1*0501-DQB1*0201 were susceptible to the hyporeaction induced by Tk or a Tk-derived peptide. This indicates that Tk could induce an HLA-associated immune suppression via activating IL-4/IL-10-secreting T cells, which might belong to CD8 Tc2 subset.
Collapse
Affiliation(s)
- Hong Zhou
- Shanghai Institute of Immunology, Shanghai Jiaotong University School of Medicine, Shanghai 200025, China
| | | | | | | | | | | | | | | | | |
Collapse
|
29
|
Lei H, Qi J, Song J, Yang D, Wang Y, Zhang Y, Yang J. Biosynthesis and bioactivity of trichosanthin in cultured crown gall tissues of Trichosanthes kirilowii Maximowicz. PLANT CELL REPORTS 2006; 25:1205-12. [PMID: 16758196 DOI: 10.1007/s00299-006-0187-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2005] [Revised: 05/04/2006] [Accepted: 05/19/2006] [Indexed: 05/10/2023]
Abstract
Trichosanthin (TCS) from Trichosanthes kirilowii Maximowicz (T. kirilowii) can be used to treat choriocarcinoma. In this work, we established a novel system to produce TCS in crown gall tissues of T. kirilowii infected by Agrobacterium tumefaciens C58 (A. tumefaciens). In the crown gall tissues, a nopaline synthase (NOS) gene of A. tumefaciens was identified by polymerase chain reaction (PCR), and nopaline accumulation was confirmed by a high-voltage filter paper electrophoresis. Furthermore, we optimized conditions to culture the crown gall tissues able to grow fast and produce TCS in an auxin-free medium, and found that a fungal elicitor of Armillaria mellea was capable of stimulation of TCS secretion into the medium. Moreover, we identified that the TCS purified from the crown gall tissues could induce gastric cancer cell death. These data underscore the usefulness of our system as an inexpensive and virtually unlimited source of TCS.
Collapse
Affiliation(s)
- Hetian Lei
- Institute of Medicinal Plant Development, Chinese Academy of Medical Science & Peking Union Medical College, Xi-Bei-Wang, Hai-Dian District, Beijing, 100094, PR China.
| | | | | | | | | | | | | |
Collapse
|
30
|
An Q, Wei S, Mu S, Zhang X, Lei Y, Zhang W, Jia N, Cheng X, Fan A, Li Z, Xu Z. Mapping the antigenic determinants and reducing the immunogenicity of trichosanthin by site-directed mutagenesis. J Biomed Sci 2006; 13:637-43. [PMID: 16977428 DOI: 10.1007/s11373-006-9095-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2006] [Accepted: 06/01/2006] [Indexed: 11/26/2022] Open
Abstract
Trichosanthin (TCS) is a type I ribosome-inactivating protein (RIP) possessing multiple pharmacological properties. One of its interesting properties is to inhibit human immunodeficiency virus (HIV) replication but its strong immunogenicity has limited the repeated clinical administration. To map the antigenic determinants and reduce the immunogenicity of TCS, two potential antigenic sites (YFF81-83 and KR173-174) were identified by computer modeling, and then three TCS mutants namely TCS(YFF81-83ACS), TCS(KR173-174CG), and TCS(YFF-KR) were constructed by site-directed mutagenesis. The RI activity and DNase-like activity of the three constructed TCS mutants were similar to natural TCS but with much lower immunogenicity. Results suggested that the two selected sites are all located at or near the antigenic determinants of TCS. In toxicity studies, the LD(50) of the three TCS mutants was not different from natural TCS. These findings would be useful in designing a better therapeutic agent for AIDS.
Collapse
Affiliation(s)
- Qunxing An
- Department of Microbiology, Fourth Medical University of PLA, Xi'an, 710032, China
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
31
|
Aceto S, Di Maro A, Conforto B, Siniscalco GG, Parente A, Delli Bovi P, Gaudio L. Nicking activity on pBR322 DNA of ribosome inactivating proteins from Phytolacca dioica L. leaves. Biol Chem 2005; 386:307-17. [PMID: 15899692 DOI: 10.1515/bc.2005.037] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Ribosome-inactivating proteins isolated from Phytolacca dioica L. leaves are rRNA-N-glycosidases, as well as adenine polynucleotide glycosylases. Here we report that some of them cleave supercoiled pBR322 dsDNA, generating relaxed and linear molecules. PD-L1, the glycosylated major form isolated from the winter leaves of adult P . dioica plants, produces both free 3'-OH and 5'-P termini randomly distributed along the DNA molecule, as suggested by labelling experiments with [alpha- 32P]dCTP and [gamma- 32 P]dATP. Moreover, when the reaction is carried out under low-salt conditions, cleavage is observed mainly at a specific site, located downstream of the ampicillin resistance gene (close to position 3200), ending with the deletion of a fragment of approximately 70 nucleotides. This cleavage pattern is similar to that obtained under the same conditions with mung bean nuclease, a single-strand endonuclease. Furthermore, pBR322 DNA treated with PD-L1 shows reduced transforming activity with E . coli HB101 competent cells in comparison to untreated control plasmid DNA.
Collapse
Affiliation(s)
- Serena Aceto
- Dipartimento di Genetica, Biologia Generale e Molecolare, Università degli Studi di Napoli Federico II, Via Mezzocannone 8, I-80134 Napoli, Italy
| | | | | | | | | | | | | |
Collapse
|
32
|
Xia XF, Wang F, Yang M, Sui SF. Trichosanthin’s interfacial interactions with phospholipids: a monolayer study. Colloids Surf B Biointerfaces 2004; 39:105-12. [PMID: 15556338 DOI: 10.1016/j.colsurfb.2003.12.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Lipid monolayer at the air/water interface, as half a membrane, was used here to investigate the interaction between trichosanthin (TCS), a ribosome inactivating protein, and phospholipid membrane. First, the protein adsorption experiments showed that the negatively charged DPPG caused obvious enrichment of TCS beneath the monolayer, indicating electrostatic attraction between TCS and the negatively charged phospholipid. Second, when TCS was incorporated into the phospholipid monolayer, it could not be completely squeezed out until the monolayer collapsed. The results were demonstrated to be irrelative with the phospholipid headgroup, suggesting a strong hydrophobic force between TCS and phospholipid hydrocarbon chain was involved in the interaction. Third, the protein/membrane interaction was further studied with fluorescence microscope. The results showed that TCS could penetrate into both the condensed and the fluid phase of the DPPG monolayer under low pH condition and eventually resulted in a homogeneous phospholipid phase. The breakage of ordered packing of phospholipid by TCS may be responsible for this homogenizing effect.
Collapse
Affiliation(s)
- Xiao-Feng Xia
- Department of Biological Sciences and Biotechnology, State-Key Laboratory of Biomembrane, Tsinghua University, Beijing 100084, China
| | | | | | | |
Collapse
|
33
|
Sharma N, Park SW, Vepachedu R, Barbieri L, Ciani M, Stirpe F, Savary BJ, Vivanco JM. Isolation and characterization of an RIP (ribosome-inactivating protein)-like protein from tobacco with dual enzymatic activity. PLANT PHYSIOLOGY 2004; 134:171-81. [PMID: 14671015 PMCID: PMC316297 DOI: 10.1104/pp.103.030205] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2003] [Revised: 09/10/2003] [Accepted: 09/22/2003] [Indexed: 05/09/2023]
Abstract
Ribosome-inactivating proteins (RIPs) are N-glycosidases that remove a specific adenine from the sarcin/ricin loop of the large rRNA, thus arresting protein synthesis at the translocation step. In the present study, a protein termed tobacco RIP (TRIP) was isolated from tobacco (Nicotiana tabacum) leaves and purified using ion exchange and gel filtration chromatography in combination with yeast ribosome depurination assays. TRIP has a molecular mass of 26 kD as evidenced by sodium dodecyl sulfate-polyacrylamide gel electrophoresis and showed strong N-glycosidase activity as manifested by the depurination of yeast rRNA. Purified TRIP showed immunoreactivity with antibodies of RIPs from Mirabilis expansa. TRIP released fewer amounts of adenine residues from ribosomal (Artemia sp. and rat ribosomes) and non-ribosomal substrates (herring sperm DNA, rRNA, and tRNA) compared with other RIPs. TRIP inhibited translation in wheat (Triticum aestivum) germ more efficiently than in rabbit reticulocytes, showing an IC50 at 30 ng in the former system. Antimicrobial assays using highly purified TRIP (50 microg mL(-1)) conducted against various fungi and bacterial pathogens showed the strongest inhibitory activity against Trichoderma reesei and Pseudomonas solancearum. A 15-amino acid internal polypeptide sequence of TRIP was identical with the internal sequences of the iron-superoxide dismutase (Fe-SOD) from wild tobacco (Nicotiana plumbaginifolia), Arabidopsis, and potato (Solanum tuberosum). Purified TRIP showed SOD activity, and Escherichia coli Fe-SOD was observed to have RIP activity too. Thus, TRIP may be considered a dual activity enzyme showing RIP-like activity and Fe-SOD characteristics.
Collapse
Affiliation(s)
- Neelam Sharma
- Department of Horticulture and Landscape Architecture, Colorado State University, Fort Collins, Colorado, 80523, USA
| | | | | | | | | | | | | | | |
Collapse
|
34
|
He WJ, Liu WY. Both N- and C-terminal regions are essential for cinnamomin A-chain to deadenylate ribosomal RNA and supercoiled double-stranded DNA. Biochem J 2004; 377:17-23. [PMID: 12952522 PMCID: PMC1223831 DOI: 10.1042/bj20030703] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2003] [Revised: 08/22/2003] [Accepted: 09/03/2003] [Indexed: 11/17/2022]
Abstract
Cinnamomin is a type II ribosome-inactivating protein and its A-chain exhibits RNA N-glycosidase activity to remove an adenine in the conserved sarcin/ricin loop of the largest RNA in ribosome, arresting protein synthesis at the elongation step. In this report, deadenylation of both rRNA and supercoiled DNA by native and recombinant cinnamomin A-chain expressed in Escherichia coli was demonstrated. However, the mutants of cinnamomin A-chain devoid of N-terminal 52 or/and C-terminal 51 amino acid residues lost both the activity of RNA N-glycosidase and the ability to release adenines from supercoiled DNA. Additionally, supercoiled DNA could not be cleaved into nicked and linear forms by these mutants. These results indicate that both N- and C-terminal regions are essential for the cinnamomin A-chain to deadenylate rRNA and supercoiled DNA. It was suggested that phosphodiester bonds in the extensively deadenylated region of supercoiled DNA would become fragile and liable to be broken spontaneously owing to the existence of tension in the supercoiled DNA.
Collapse
Affiliation(s)
- Wen-Jun He
- State Key Laboratory of Molecular Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, 320 Yue-Yang Road, Shanghai 200031, People's Republic of China
| | | |
Collapse
|
35
|
Wang HX, Ng TB, Cheng CHK, Fong WP. Contamination of ribosome inactivating proteins with ribonucleases, separated by affinity chromatography on red sepharose. Prep Biochem Biotechnol 2003; 33:101-11. [PMID: 12784881 DOI: 10.1081/pb-120021435] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Three preparations of type 1 ribosome inactivating proteins (RIPs), namely, agrostin, saporin, and luffin, were subjected to affinity chromatography on Red Sepharose and eluted with a linear concentration gradient of NaCl in 10 mM Tris-HCl buffer (pH 7.4). The eluate was assayed for ability to inhibit translation in a cell-free rabbit reticulocyte lysate system which measures RIP activity, and for ability to hydrolyze yeast transfer RNA which measures RNase activity. It was found that, in all three RIP preparations, the peak of RIP activity, which coincided with the peak of absorbance at 280 nm, was eluted earlier than the peak of RNase activity. It appears that RNase is a possible contaminant of ribosome inactivating protein preparations and that this contamination can be minimized by using Red Sepharose.
Collapse
Affiliation(s)
- H X Wang
- Department of Microbiology, China Agricultural University, Beijing, P. R. China
| | | | | | | |
Collapse
|
36
|
Vivanco JM, Tumer NE. Translation Inhibition of Capped and Uncapped Viral RNAs Mediated by Ribosome-Inactivating Proteins. PHYTOPATHOLOGY 2003; 93:588-95. [PMID: 18942981 DOI: 10.1094/phyto.2003.93.5.588] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
ABSTRACT Ribosome-inactivating proteins (RIPs) are N-glycosidases that remove specific purine residues from the sarcin/ricin (S/R) loop of the large rRNA and arrest protein synthesis at the translocation step. In addition to their enzymatic activity, RIPs have been reputed to be potent antiviral agents against many plant, animal, and human viruses. We recently showed that pokeweed antiviral protein (PAP), an RIP from pokeweed, inhibits translation in cell extracts by binding to the cap structure of eukaryotic mRNA and viral RNAs and depurinating these RNAs at multiple sites downstream of the cap structure. In this study, we examined the activity of three different RIPs against capped and uncapped viral RNAs. PAP, Mirabilis expansa RIP (ME1), and the Saponaria officinalis RIP (saporin) depurinated the capped Tobacco mosaic virus and Brome mosaic virus RNAs, but did not depurinate the uncapped luciferase RNA, indicating that other type I RIPs besides PAP can distinguish between capped and uncapped RNAs. We did not detect depurination of Alfalfa mosaic virus (AMV) RNAs at multiple sites by PAP or ME1. Because AMV RNAs are capped, these results indicate that recognition of the cap structure alone is not sufficient for depurination of the RNA at multiple sites throughout its sequence. Furthermore, PAP did not cause detectable depurination of uncapped RNAs from Tomato bushy stunt virus (TBSV), Satellite panicum mosaic virus (SPMV), and uncapped RNA containing poliovirus internal ribosome entry site (IRES). However, in vitro translation experiments showed that PAP inhibited translation of AMV, TBSV, SPMV RNAs, and poliovirus IRES dependent translation. These results demonstrate that PAP does not depurinate every capped RNA and that PAP can inhibit translation of uncapped viral RNAs in vitro without causing detectable depurination at multiple sites. Thus, the cap structure is not the only determinant for inhibition of translation by PAP.
Collapse
|
37
|
Park SW, Lawrence CB, Linden JC, Vivanco JM. Isolation and characterization of a novel ribosome-inactivating protein from root cultures of pokeweed and its mechanism of secretion from roots. PLANT PHYSIOLOGY 2002. [PMID: 12226497 DOI: 10.1104/pp.000794.of] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Ribosome-inactivating proteins are N-glycosidases that remove a specific adenine from the sarcin/ricin loop of the large rRNA, thus arresting protein synthesis at the translocation step. In the present study, a novel type I ribosome-inactivating protein, termed PAP-H, was purified from Agrobacterium rhizogenes-transformed hairy roots of pokeweed (Phytolacca americana). The protein was purified by anion- and cation-exchange chromatography. PAP-H has a molecular mass of 29.5 kD as detected by sodium dodecyl sulfate-polyacrylamide gel electrophoresis, and its isoelectric point was determined to be 7.8. Yeast (Saccharomyces cerevisiae) ribosomes incubated with PAP-H released the 360-nucleotide diagnostic fragment from the 26S rRNA upon aniline treatment, an indication of its ribosome-inactivating activity. Using immunofluorescence microscopy, PAP-H was found to be located in the cell walls of hairy roots and root border cells. PAP-H was determined to be constitutively secreted as part of the root exudates, with its secretion enhanced by a mechanism mediated by ethylene induction. Purified PAP-H did not show in vitro antifungal activity against soil-borne fungi. In contrast, root exudates containing PAP-H as well as additional chitinase, beta-1,3-glucanase, and protease activities did inhibit the growth of soil-borne fungi. We found that PAP-H depurinates fungal ribosomes in vitro and in vivo, suggesting an additive mechanism that enables PAP-H to penetrate fungal cells.
Collapse
Affiliation(s)
- Sang-Wook Park
- Department of Horticulture and Landscape Architecture, Colorado State University, Fort Collins, Colorado 80523-1173, USA
| | | | | | | |
Collapse
|
38
|
Park SW, Lawrence CB, Linden JC, Vivanco JM. Isolation and characterization of a novel ribosome-inactivating protein from root cultures of pokeweed and its mechanism of secretion from roots. PLANT PHYSIOLOGY 2002; 130:164-78. [PMID: 12226497 PMCID: PMC166550 DOI: 10.1104/pp.000794] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2001] [Revised: 04/26/2002] [Accepted: 05/24/2002] [Indexed: 05/18/2023]
Abstract
Ribosome-inactivating proteins are N-glycosidases that remove a specific adenine from the sarcin/ricin loop of the large rRNA, thus arresting protein synthesis at the translocation step. In the present study, a novel type I ribosome-inactivating protein, termed PAP-H, was purified from Agrobacterium rhizogenes-transformed hairy roots of pokeweed (Phytolacca americana). The protein was purified by anion- and cation-exchange chromatography. PAP-H has a molecular mass of 29.5 kD as detected by sodium dodecyl sulfate-polyacrylamide gel electrophoresis, and its isoelectric point was determined to be 7.8. Yeast (Saccharomyces cerevisiae) ribosomes incubated with PAP-H released the 360-nucleotide diagnostic fragment from the 26S rRNA upon aniline treatment, an indication of its ribosome-inactivating activity. Using immunofluorescence microscopy, PAP-H was found to be located in the cell walls of hairy roots and root border cells. PAP-H was determined to be constitutively secreted as part of the root exudates, with its secretion enhanced by a mechanism mediated by ethylene induction. Purified PAP-H did not show in vitro antifungal activity against soil-borne fungi. In contrast, root exudates containing PAP-H as well as additional chitinase, beta-1,3-glucanase, and protease activities did inhibit the growth of soil-borne fungi. We found that PAP-H depurinates fungal ribosomes in vitro and in vivo, suggesting an additive mechanism that enables PAP-H to penetrate fungal cells.
Collapse
Affiliation(s)
- Sang-Wook Park
- Department of Horticulture and Landscape Architecture, Colorado State University, Fort Collins, Colorado 80523-1173, USA
| | | | | | | |
Collapse
|
39
|
Xia XF, Wang F, Sui SF. Effect of phospholipid on trichosanthin adsorption at the air-water interface. BIOCHIMICA ET BIOPHYSICA ACTA 2001; 1515:1-11. [PMID: 11597347 DOI: 10.1016/s0005-2736(01)00348-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Trichosanthin (TCS) is a toxic protein with multiple pharmacological properties. It belongs to the type I ribosome inactivating protein (RIP) family and can inactivate the eukaryotic ribosome through its RNA N-glycosidase activity. The interaction between TCS and phospholipid membrane was thought to be essential for its physiological effect, for it must get across the cell membrane before it can enter the cytoplasm and exert its RIP function. In order to study the TCS-phospholipid interaction, the difference between spontaneous and phospholipid induced adsorption of TCS at the air-water interface was investigated, and the results were analyzed according to the diffusion-penetration-rearrangement adsorption model. The results showed that both negatively charged 1,2-dipalmitoyl-sn-glycero-3-phosphoglycerol (DPPG) and neutral 1,2-dipalmitoyl-sn-glycero-3-phosphocholine can accelerate the adsorption rate, while there exists a possible membrane induced conformational change of TCS which is specific for the negatively charged DPPG. We also proposed a revised model for the diffusion controlled initial adsorption period.
Collapse
Affiliation(s)
- X F Xia
- State Key Laboratory of Biomembrane, Department of Biological Sciences and Biotechnology, Tsinghua University, 100084, Beijing, PR China
| | | | | |
Collapse
|
40
|
Peumans WJ, Hao Q, Van Damme EJ. Ribosome-inactivating proteins from plants: more than RNA N-glycosidases? FASEB J 2001; 15:1493-506. [PMID: 11427481 DOI: 10.1096/fj.00-0751rev] [Citation(s) in RCA: 210] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Many plants contain proteins that are capable of inactivating ribosomes and accordingly are called ribosome-inactivating proteins or RIPs. These typical plant proteins receive a lot of attention in biological and biomedical research because of their unique biological activities toward animal and human cells. In addition, evidence is accumulating that some RIPs play a role in plant defense and hence can be exploited in plant protection. To understand the mode of action of RIPs and to optimize their medical and therapeutical applications and their use as antiviral compounds in plant protection, intensive efforts have been made to unravel the enzymatic activities of RIPs and provide a structural basis for these activities. Though marked progress has been made during the last decade, the enzymatic activity of RIPs has become a controversial issue because of the concept that RIPs possess, in addition to their classical RNA N-glycosidase and polynucleotide:adenosine glycosidase activity, other unrelated enzymatic activities. Moreover, the presumed novel enzymatic activities, especially those related to diverse nuclease activities, are believed to play an important role in various biological activities of RIPs. However, both the novel enzymatic activities and their presumed involvement in the biological activities of RIPs have been questioned because there is evidence that the activities observed are due to contaminating enzymes. We offer a critical review of the pros and cons of the putative novel enzymatic activities of RIPs. Based on the available data, it is suggested that there is little conclusive evidence in support of the presumed activities and that in the past too little attention has been given to the purity of the RIP preparation. The antiviral activity and mode of action of RIPs in plants are discussed in view of their classical and presumed novel enzymatic activities.
Collapse
Affiliation(s)
- W J Peumans
- Laboratory of Phytopathology and Plant Protection, Katholieke Universiteit Leuven, 3001 Leuven, Belgium
| | | | | |
Collapse
|
41
|
Nielsen K, Boston RS. RIBOSOME-INACTIVATING PROTEINS: A Plant Perspective. ANNUAL REVIEW OF PLANT PHYSIOLOGY AND PLANT MOLECULAR BIOLOGY 2001; 52:785-816. [PMID: 11337416 DOI: 10.1146/annurev.arplant.52.1.785] [Citation(s) in RCA: 203] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Ribosome-inactivating proteins (RIPs) are toxic N-glycosidases that depurinate the universally conserved alpha-sarcin loop of large rRNAs. This depurination inactivates the ribosome, thereby blocking its further participation in protein synthesis. RIPs are widely distributed among different plant genera and within a variety of different tissues. Recent work has shown that enzymatic activity of at least some RIPs is not limited to site-specific action on the large rRNAs of ribosomes but extends to depurination and even nucleic acid scission of other targets. Characterization of the physiological effects of RIPs on mammalian cells has implicated apoptotic pathways. For plants, RIPs have been linked to defense by antiviral, antifungal, and insecticidal properties demonstrated in vitro and in transgenic plants. How these effects are brought about, however, remains unresolved. At the least, these results, together with others summarized here, point to a complex biological role. With genetic, genomic, molecular, and structural tools now available for integrating different experimental approaches, we should further our understanding of these multifunctional proteins and their physiological functions in plants.
Collapse
Affiliation(s)
- Kirsten Nielsen
- Department of Botany, North Carolina State University, Raleigh, North Carolina 27695-7612; e-mail: ;
| | | |
Collapse
|
42
|
Zhang C, Gong Y, Ma H, An C, Chen D, Chen ZL. Reactive oxygen species involved in trichosanthin-induced apoptosis of human choriocarcinoma cells. Biochem J 2001; 355:653-61. [PMID: 11311127 PMCID: PMC1221780 DOI: 10.1042/bj3550653] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The type-I ribosome-inactivating protein trichosanthin (TCS) has a broad spectrum of biological and pharmacological activities, including abortifacient, anti-tumour and anti-HIV activities. We have found for the first time that TCS stimulated the production of reactive oxygen species (ROS) in JAR cells (a human choriocarcinoma cell line) in a time- and concentration-dependent manner by using the fluorescent probe 2',7'-dichlorofluorescein diacetate with confocal laser scanning microscopy. ESR spectral studies and the inhibition of ROS formation by the superoxide radical anion (O(2)(-.)) scavenger superoxide dismutase, the H(2)O(2) scavenger catalase and the hydroxyl radical (OH(.)) scavenger mannitol suggested the involvement of O(2)(-.), H(2)O(2) and OH(.). TCS-induced ROS formation was shown to be dependent on the presence of both extracellular and intracellular Ca(2+); moreover, ROS production paralleled the intracellular Ca(2+) elevation induced by TCS, suggesting that ROS production might be a consequence of Ca(2+) signalling. TCS-induced activation of caspase-3 was initiated within 2 h; however, TCS-induced production of ROS was initiated within 5 min, suggesting that the production of ROS preceded the activation of caspase-3. Simultaneous observation of the nuclear morphological changes via two-photon laser scanning microscopy and ROS production via confocal laser scanning microscopy revealed that ROS is involved in the apoptosis of JAR cells. The involvement of ROS was also confirmed by the inhibition of TCS-induced cell death by the antioxidant Trolox and the ROS scavengers catalase and mannitol. Diethylenetriaminepenta-acetic acid, an inhibitor of metal-facilitated OH(.) formation, markedly inhibited TCS-induced cell death, suggesting that TCS induced OH(.) formation via the Fenton reaction. The finding that ROS is involved in the TCS-induced apoptosis of JAR cells might provide new insight into the anti-tumour and anti-HIV mechanism of TCS.
Collapse
Affiliation(s)
- C Zhang
- Molecular and Nano Sciences Laboratory, Department of Physics, Tsinghua University, Beijing 100084, China
| | | | | | | | | | | |
Collapse
|
43
|
Affiliation(s)
- P Wang
- Biotechnology Center for Agriculture and the Environment, Rutgers University, New Brunswick, New Jersey 08901, USA
| | | |
Collapse
|
44
|
Wang HX, Ng TB. Heterogeneity of the ribosome-inactivating protein trichosanthin in Trichosanthes kirilowii tubers. Comp Biochem Physiol B Biochem Mol Biol 2000; 127:519-24. [PMID: 11281269 DOI: 10.1016/s0305-0491(00)00291-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The ribosome-inactivating protein trichosanthin isolated from the tubers of Trichosanthes kirilowii, the Chinese drug Tianhuafen, has a molecular mass of approximately 26 kDa. We show here that T. kirilowii tubers also contain ribosome-inactivating proteins with a small extent of structural variation from and a larger molecular mass than trichosanthin.
Collapse
Affiliation(s)
- H X Wang
- Department of Microbiology, China Agricultural University, Beijing, PR China
| | | |
Collapse
|
45
|
Hao Q, Van Damme EJ, Barre A, Sillen A, Rougé P, Engelborghs Y, Peumans WJ. Microenvironment of cysteine 242 in type-1 ribosome-inactivating protein from iris. Biochem Biophys Res Commun 2000; 275:481-7. [PMID: 10964691 DOI: 10.1006/bbrc.2000.3338] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
IRIP is a type-1 ribosome-inactivating protein isolated from the bulbs of Iris hollandica. It is one of the few type-1 RIPs that contain Cys residue(s) in their primary sequence. IRIP contains a single Cys residue at position 242. Although IRIP is thought to be a monomeric protein, SDS-PAGE indicates that part of the IRIP molecules can exist as disulphide bridge-linked dimers. Probing of the reactivity of the unique Cys residue by 5, 5'-dithiobis(2-nitrobenzoic acid) indicates that Cys(242) in IRIP is free but is only partially accessible to modifiers. Molecular modelling of IRIP is in agreement with this conclusion. Binding of the ligands adenine and poly(A) results in little or no effect on the conformation of Cys(242) in IRIP. Chemical modification of IRIP by a specific thiol modifier does not abolish the RNA N-glycosidase activity of IRIP, suggesting that Cys(242) is not critical for the enzymatic activity of IRIP. These results suggest that IRIP has the potential to be developed as a novel immunotoxin.
Collapse
Affiliation(s)
- Q Hao
- Laboratory of Phytopathology and Plant Protection, Katholieke Universiteit Leuven, Willem de Croylaan 42, Leuven, 3001, Belgium
| | | | | | | | | | | | | |
Collapse
|
46
|
Xia XF, Sui SF. The membrane insertion of trichosanthin is membrane-surface-pH dependent. Biochem J 2000; 349 Pt 3:835-41. [PMID: 10903146 PMCID: PMC1221212 DOI: 10.1042/bj3490835] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Trichosanthin (TCS) is the active component extracted from Tianhuafen, a traditional herbal medicine that has been used for abortion in China for centuries. It belongs to the type-I ribosome-inactivating protein (RIP) family and can inactivate the eukaryotic ribosome through its RNA N-glycosidase activity. Recent studies have shown TCS to be multifunctional, its pharmacological properties including immunomodulatory, anti-tumour and anti-HIV activities. The membrane-insertion property of TCS is thought to be essential for its physiological effect, for it must get across the membrane before it can enter the cytoplasm and exert its RIP function. In this paper, the membrane-insertion mechanism of TCS was studied. The monolayer experiment revealed that TCS's membrane-insertion ability was dependent on low pH. Fluorescence spectroscopy using 1-anilinonaphthalene-8-sulphonic acid as a probe showed that low pH may induce the conformational change of TCS that leads to the hydrophobic-site exposure, and the CD result showed that this conformational change did not alter its secondary structure. Such conformational change leads to an intermediate state, called the 'molten globular state' by previous investigators. The pH-dependent membrane insertion and conformational change were related by the fact that the optimal membrane-surface pH needed was the same for the two events. From these and other results, a membrane-insertion model was proposed.
Collapse
Affiliation(s)
- X F Xia
- State Key Laboratory of Biomembranes, Department of Biological Sciences and Biotechnology, Tsinghua University, Beijing 100084, People's Republic of China
| | | |
Collapse
|
47
|
Barbieri L, Valbonesi P, Govoni M, Pession A, Stirpe F. Polynucleotide:adenosine glycosidase activity of saporin-L1: effect on various forms of mammalian DNA. BIOCHIMICA ET BIOPHYSICA ACTA 2000; 1480:258-66. [PMID: 10899626 DOI: 10.1016/s0167-4838(00)00077-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Saporin-L1 from the leaves of Saponaria officinalis belongs to a group of plant polynucleotide:adenosine glycosidases, known as ribosome-inactivating proteins due to their property of depurinating the major rRNA. Previous experiments indicated that saporin-L1 and other ribosome-inactivating proteins depurinate also DNA [Barbieri et al. (1994) Nature 372, 324; and (1996) Biochem. J. 319, 507-513]. Here we describe the effects of highly purified nuclease-free saporin-L1 on mammalian nuclear and mitochondrial DNA. Saporin-L1 had less activity on mitochondrial DNA than on nuclear DNA. A low, although significant, depurination of both chromatin and whole nuclei was observed. Mitochondrial nucleic acids are heavily depurinated in intact mitochondria, although the contribute of mtDNA to the deadenylation events is not known. The kinetic constants for several substrates were determined.
Collapse
Affiliation(s)
- L Barbieri
- Dipartimento di Patologia Sperimentale, Università di Bologna, Via San Giacomo, 14, I-40126, Bologna, Italy.
| | | | | | | | | |
Collapse
|
48
|
Fong WP, Mock WY, Ng TB. Intrinsic ribonuclease activities in ribonuclease and ribosome-inactivating proteins from the seeds of bitter gourd. Int J Biochem Cell Biol 2000; 32:571-7. [PMID: 10736572 DOI: 10.1016/s1357-2725(99)00149-1] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Alpha- and beta-momorcharins are ribosome-inactivating proteins present in the seeds of the bitter gourd (Momordica charantia). Both of them possess ribonuclease activity which may account for some of their biological properties. However, the activity is weak and hence it is important to confirm that the ribonuclease activity observed is not due to any contamination. To this end, the ribonuclease from the seeds of M. charantia (RNase-MC) was purified and compared with the ribonuclease activity of the momorcharins. Purification was achieved by ion-exchange chromatographies on DEAE-cellulose, SP-Sepharose and Mono-S. RNase-MC had a molecular mass of 22 kDa. It acted on tRNA to release acid-soluble UV-absorbing species with a pH optimum around 6.0-6.5. When polyhomoribonucleotides were used as substrates, it was found that RNase-MC acted preferentially on polyU but exerted much weaker activity on polyC, polyG and polyA. Chromatographic analysis of the reaction product indicated that mono- and oligo-ribonucleotides, but not free base, were generated from polyU, suggesting that the enzymatic action involved ribonucleolytic cleavage. RNase-MC exhibited a much more potent (at least 1000-fold higher) ribonuclease activity than alpha- and beta-momorcharins. RNase-MC, alpha-momorcharin and beta-momorcharin were separable on Mono-S, indicating that the ribonuclease activities present in the three proteins were distinct entities.
Collapse
Affiliation(s)
- W P Fong
- Department of Biochemistry, The Chinese University of Hong Kong, Shatin, People's Republic of China.
| | | | | |
Collapse
|
49
|
Hudak KA, Wang P, Tumer NE. A novel mechanism for inhibition of translation by pokeweed antiviral protein: depurination of the capped RNA template. RNA (NEW YORK, N.Y.) 2000; 6:369-80. [PMID: 10744021 PMCID: PMC1369919 DOI: 10.1017/s1355838200991337] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Pokeweed antiviral protein (PAP) is known to inactivate ribosomes by removal of a specific adenine from the sarcin/ricin (S/R) loop of the large rRNA, thereby inhibiting translation. We demonstrate here that in addition to the previously identified adenine (A4324), PAP removes another adenine (A4321) and a guanine (G4323) from the eukaryotic large rRNA. Recent results indicate that the antiviral activity of PAP may not be due to depurination of host ribosomes. Using PAP mutants that do not depurinate either tobacco or reticulocyte lysate rRNA, we show that PAP inhibits translation of brome mosaic virus (BMV) and potato virus X (PVX) RNAs without depurinating ribosomes. Furthermore, translation of only capped, but not uncapped, luciferase transcripts is inhibited by PAP, providing evidence that PAP and PAP mutants are able to distinguish between capped and uncapped transcripts. Translation inhibition of BMV RNAs is overcome by treatment with PAP in the presence of increasing concentrations of the cap analog m7GpppG, but not GpppG or GTP, indicating that PAP recognizes the cap structure. Incubation of BMV RNAs or the capped luciferase transcripts with PAP results in depurination of either RNA. In contrast, uncapped luciferase transcripts are not depurinated after incubation with identical concentrations of PAP. These results demonstrate for the first time that PAP can inhibit translation by a mechanism other than ribosome depurination, by recognizing the cap structure and specifically depurinating the capped RNAs.
Collapse
Affiliation(s)
- K A Hudak
- Biotechnology Center for Agriculture and the Environment, and the Department of Plant Pathology, Cook College, Rutgers University, New Brunswick, New Jersey 08903, USA
| | | | | |
Collapse
|
50
|
Wang YX, Neamati N, Jacob J, Palmer I, Stahl SJ, Kaufman JD, Huang PL, Huang PL, Winslow HE, Pommier Y, Wingfield PT, Lee-Huang S, Bax A, Torchia DA. Solution structure of anti-HIV-1 and anti-tumor protein MAP30: structural insights into its multiple functions. Cell 1999; 99:433-42. [PMID: 10571185 DOI: 10.1016/s0092-8674(00)81529-9] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
We present the solution structure of MAP30, a plant protein with anti-HIV and anti-tumor activities. Structural analysis and subsequent biochemical assays lead to several novel discoveries. First, MAP30 acts like a DNA glycosylase/apurinic (ap) lyase, an additional activity distinct from its known RNA N-glycosidase activity toward the 28S rRNA. Glycosylase/ap lyase activity explains MAP30's apparent inhibition of the HIV-1 integrase, MAP30's ability to irreversibly relax supercoiled DNA, and may be an alternative cytotoxic pathway that contributes to MAP30's anti-HIV/anti-tumor activities. Second, two distinct, but contiguous, subsites are responsible for MAP30's glycosylase/ap lyase activity. Third, Mn2+ and Zn2+ interact with negatively charged surfaces next to the catalytic sites, facilitating DNA substrate binding instead of directly participating in catalysis.
Collapse
Affiliation(s)
- Y X Wang
- Molecular Structural Biology Laboratory, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, Maryland 20892-4310, USA
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|