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Lu JQ, Wong KB, Shaw PC. A Sixty-Year Research and Development of Trichosanthin, a Ribosome-Inactivating Protein. Toxins (Basel) 2022; 14:toxins14030178. [PMID: 35324675 PMCID: PMC8950148 DOI: 10.3390/toxins14030178] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [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.
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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
- Correspondence:
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Lu JQ, Shi WW, Xiao MJ, Tang YS, Zheng YT, Shaw PC. Lyophyllin, a Mushroom Protein from the Peptidase M35 Superfamily Is an RNA N-Glycosidase. Int J Mol Sci 2021; 22:ijms222111598. [PMID: 34769028 PMCID: PMC8584072 DOI: 10.3390/ijms222111598] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2021] [Revised: 10/21/2021] [Accepted: 10/22/2021] [Indexed: 11/16/2022] Open
Abstract
Ribosome-inactivating proteins (RIPs) hydrolyze the N-glycosidic bond and depurinate a specific adenine residue (A-4324 in rat 28S ribosomal RNA, rRNA) in the conserved α-sarcin/ricin loop (α-SRL) of rRNA. In this study, we have purified and characterized lyophyllin, an unconventional RIP from Lyophyllum shimeji, an edible mushroom. The protein resembles peptidase M35 domain of peptidyl-Lys metalloendopeptidases. Nevertheless, protein either from the mushroom or in recombinant form possessed N-glycosidase and protein synthesis inhibitory activities. A homology model of lyophyllin was constructed. It was found that the zinc binding pocket of this protein resembles the catalytic cleft of a classical RIP, with key amino acids that interact with the adenine substrate in the appropriate positions. Mutational studies showed that E122 may play a role in stabilizing the positively charged oxocarbenium ion and H121 for protonating N-3 of adenine. The tyrosine residues Y137 and Y104 may be used for stacking the target adenine ring. This work first shows a protein in the peptidase M35 superfamily based on conserved domain search possessing N-glycosidase activity.
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Affiliation(s)
- Jia-Qi Lu
- Centre for Protein Science and Crystallography, School of Life Sciences, The Chinese University of Hong Kong, Hong Kong, China; (J.-Q.L.); (M.-J.X.); (Y.-S.T.)
- Li Dak Sum Yip Yio Chin R & D Centre for Chinese Medicine, The Chinese University of Hong Kong, Hong Kong, China
| | - Wei-Wei Shi
- BayRay Innovation Center, Shenzhen Bay Laboratory, Shenzhen 518107, China;
| | - Meng-Jie Xiao
- Centre for Protein Science and Crystallography, School of Life Sciences, The Chinese University of Hong Kong, Hong Kong, China; (J.-Q.L.); (M.-J.X.); (Y.-S.T.)
- Li Dak Sum Yip Yio Chin R & D Centre for Chinese Medicine, The Chinese University of Hong Kong, Hong Kong, China
| | - Yun-Sang Tang
- Centre for Protein Science and Crystallography, School of Life Sciences, The Chinese University of Hong Kong, Hong Kong, China; (J.-Q.L.); (M.-J.X.); (Y.-S.T.)
- Li Dak Sum Yip Yio Chin R & D Centre for Chinese Medicine, The Chinese University of Hong Kong, Hong Kong, China
| | - 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, China;
| | - Pang-Chui Shaw
- Centre for Protein Science and Crystallography, School of Life Sciences, The Chinese University of Hong Kong, Hong Kong, China; (J.-Q.L.); (M.-J.X.); (Y.-S.T.)
- Li Dak Sum Yip Yio Chin R & D Centre for Chinese Medicine, The Chinese University of Hong Kong, Hong Kong, China
- Correspondence:
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Britikov VV, Britikova EV, Urban AS, Lesovoy DM, Le TBT, Van Phan C, Usanov SA, Arseniev AS, Bocharov EV. Backbone and side-chain chemical shift assignments for the ribosome-inactivating protein trichobakin (TBK). BIOMOLECULAR NMR ASSIGNMENTS 2020; 14:55-61. [PMID: 31734904 DOI: 10.1007/s12104-019-09920-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2019] [Accepted: 11/11/2019] [Indexed: 06/10/2023]
Abstract
Trichobakin (TBK) is a type-I ribosome-inactivating protein (RIP-I), acting as an extremely potent inhibitor of protein synthesis in the cell-free translation system of rabbit reticulocyte lysate (IC50: 3.5 pM). In this respect, TBK surpasses the well-studied highly homologous RIP-I trichosanthin (IC50: 20-27 pM), therefore creation of recombinant toxins based on it is of great interest. TBK needs to penetrate into cytosol through the cell membrane and specifically bind to α-sarcin/ricin loop of 28S ribosome RNA to perform the function of specific RNA depurination. At the moment, there is no detailed structural-dynamic information in solution about diverse states RIP-I can adopt at different stages on the way to protein synthesis inhibition. In this work, we report a near-complete assignment of 1H, 13C, and 15N TBK (27.3 kDa) resonances and analysis of the secondary structure based on the experimental chemical shifts data. This work will serve as a basis for further investigations of the structure, dynamics and interactions of the TBK with its molecular partners using NMR techniques.
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Affiliation(s)
- Vladimir V Britikov
- Institute of Bioorganic Chemistry, National Academy of Sciences of Belarus, Minsk, Belarus.
| | - Elena V Britikova
- Institute of Bioorganic Chemistry, National Academy of Sciences of Belarus, Minsk, Belarus
| | - Anatoly S Urban
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
- Moscow Institute of Physics and Technology (MIPT), Dolgoprudny, Russia
| | - Dmitry M Lesovoy
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | - Thi Bich Thao Le
- Institute of Biotechnology, Vietnam Academy of Science and Technology, Hanoi, Vietnam
| | - Chi Van Phan
- Institute of Biotechnology, Vietnam Academy of Science and Technology, Hanoi, Vietnam
| | - Sergey A Usanov
- Institute of Bioorganic Chemistry, National Academy of Sciences of Belarus, Minsk, Belarus
| | - Alexander S Arseniev
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
- Moscow Institute of Physics and Technology (MIPT), Dolgoprudny, Russia
| | - Eduard V Bocharov
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
- Moscow Institute of Physics and Technology (MIPT), Dolgoprudny, Russia
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Bansia H, Bagaria S, Karande AA, Ramakumar S. Structural basis for neutralization of cytotoxic abrin by monoclonal antibody D6F10. FEBS J 2019; 286:1003-1029. [DOI: 10.1111/febs.14716] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2018] [Revised: 11/02/2018] [Accepted: 11/30/2018] [Indexed: 11/26/2022]
Affiliation(s)
- Harsh Bansia
- Department of Physics Indian Institute of Science Bengaluru India
| | - Shradha Bagaria
- Department of Biochemistry Indian Institute of Science Bengaluru India
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Pandey SN, Iqbal N, Singh PK, Rastogi N, Kaur P, Sharma S, Singh TP. Binding and structural studies of the complexes of type 1 ribosome inactivating protein from Momordica balsamina
with uracil and uridine. Proteins 2018; 87:99-109. [DOI: 10.1002/prot.25584] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2018] [Revised: 05/07/2018] [Accepted: 07/04/2018] [Indexed: 01/24/2023]
Affiliation(s)
- Sada Nand Pandey
- Department of Biophysics; All India Institute of Medical Sciences; New Delhi India
| | - Naseer Iqbal
- Department of Biophysics; All India Institute of Medical Sciences; New Delhi India
| | - Prashant K. Singh
- Department of Biophysics; All India Institute of Medical Sciences; New Delhi India
| | - Nilisha Rastogi
- Department of Biophysics; All India Institute of Medical Sciences; New Delhi India
| | - Punit Kaur
- Department of Biophysics; All India Institute of Medical Sciences; New Delhi India
| | - Sujata Sharma
- Department of Biophysics; All India Institute of Medical Sciences; New Delhi India
| | - Tej P. Singh
- Department of Biophysics; All India Institute of Medical Sciences; New Delhi India
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Giansanti F, Flavell DJ, Angelucci F, Fabbrini MS, Ippoliti R. Strategies to Improve the Clinical Utility of Saporin-Based Targeted Toxins. Toxins (Basel) 2018; 10:toxins10020082. [PMID: 29438358 PMCID: PMC5848183 DOI: 10.3390/toxins10020082] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2017] [Revised: 01/29/2018] [Accepted: 02/11/2018] [Indexed: 02/06/2023] Open
Abstract
Plant Ribosome-inactivating proteins (RIPs) including the type I RIP Saporin have been used for the construction of Immunotoxins (ITxs) obtained via chemical conjugation of the toxic domain to whole antibodies or by generating genetic fusions to antibody fragments/targeting domains able to direct the chimeric toxin against a desired sub-population of cancer cells. The high enzymatic activity, stability and resistance to conjugation procedures and especially the possibility to express recombinant fusions in yeast, make Saporin a well-suited tool for anti-cancer therapy approaches. Previous clinical work on RIPs-based Immunotoxins (including Saporin) has shown that several critical issues must be taken into deeper consideration to fully exploit their therapeutic potential. This review focuses on possible combinatorial strategies (chemical and genetic) to augment Saporin-targeted toxin efficacy. Combinatorial approaches may facilitate RIP escape into the cytosolic compartment (where target ribosomes are), while genetic manipulations may minimize potential adverse effects such as vascular-leak syndrome or may identify T/B cell epitopes in order to decrease the immunogenicity following similar strategies as those used in the case of bacterial toxins such as Pseudomonas Exotoxin A or as for Type I RIP Bouganin. This review will further focus on strategies to improve recombinant production of Saporin-based chimeric toxins.
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Affiliation(s)
- Francesco Giansanti
- Department of Life, Health and Environmental Sciences, University of L'Aquila, I-67100 L'Aquila, Italy.
| | - David J Flavell
- The Simon Flavell Leukaemia Research Laboratory (Leukaemia Busters), Southampton General Hospital, Southampton, SO16 8AT, UK.
| | - Francesco Angelucci
- Department of Life, Health and Environmental Sciences, University of L'Aquila, I-67100 L'Aquila, Italy.
| | | | - Rodolfo Ippoliti
- Department of Life, Health and Environmental Sciences, University of L'Aquila, I-67100 L'Aquila, Italy.
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Akkouh O, Ng TB, Cheung RCF, Wong JH, Pan W, Ng CCW, Sha O, Shaw PC, Chan WY. Biological activities of ribosome-inactivating proteins and their possible applications as antimicrobial, anticancer, and anti-pest agents and in neuroscience research. Appl Microbiol Biotechnol 2015; 99:9847-63. [PMID: 26394859 DOI: 10.1007/s00253-015-6941-2] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2015] [Revised: 08/10/2015] [Accepted: 08/13/2015] [Indexed: 02/06/2023]
Abstract
Ribosome-inactivating proteins (RIPs) are enzymes which depurinate ribosomal RNA (rRNA), thus impeding the process of translation resulting in inhibition of protein synthesis. They are produced by various organisms including plants, fungi and bacteria. RIPs from plants are linked to plant defense due to their antiviral, antifungal, antibacterial, and insecticidal activities in which they can be applied in agriculture to combat microbial pathogens and pests. Their anticancer, antiviral, embryotoxic, and abortifacient properties may find medicinal applications. Besides, conjugation of RIPs with antibodies or other carriers to form immunotoxins has been found useful to research in neuroscience and anticancer therapy.
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Affiliation(s)
- Ouafae Akkouh
- Department of Biology and Medical Laboratory Research, Faculty of Technology, University of Applied Sciences Leiden, Zernikdreef 11, 2333 CK, Leiden, The Netherlands.
| | - Tzi Bun Ng
- School of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong.
| | - Randy Chi Fai Cheung
- School of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong.
| | - Jack Ho Wong
- School of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong.
| | - Wenliang Pan
- School of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong.
| | - Charlene Cheuk Wing Ng
- School of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong.
| | - Ou Sha
- School of Medicine, Shenzhen University Health Science Centre, Shenzhen University, Shenzhen, China.
| | - Pang Chui Shaw
- School of Life Sciences, Faculty of Science, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong.
| | - Wai Yee Chan
- School of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong.
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8
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Vinkovic M, Dunn G, Wood GE, Husain J, Wood SP, Gill R. Cleavage of nicotinamide adenine dinucleotide by the ribosome-inactivating protein from Momordica charantia. Acta Crystallogr F Struct Biol Commun 2015; 71:1152-5. [PMID: 26323301 PMCID: PMC4555922 DOI: 10.1107/s2053230x15013540] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2015] [Accepted: 07/14/2015] [Indexed: 11/10/2022] Open
Abstract
The interaction of momordin, a type 1 ribosome-inactivating protein from Momordica charantia, with NADP(+) and NADPH has been investigated by X-ray diffraction analysis of complexes generated by co-crystallization and crystal soaking. It is known that the proteins of this family readily cleave the adenine-ribose bond of adenosine and related nucleotides in the crystal, leaving the product, adenine, bound to the enzyme active site. Surprisingly, the nicotinamide-ribose bond of oxidized NADP(+) is cleaved, leaving nicotinamide bound in the active site in the same position but in a slightly different orientation to that of the five-membered ring of adenine. No binding or cleavage of NADPH was observed at pH 7.4 in these experiments. These observations are in accord with current views of the enzyme mechanism and may contribute to ongoing searches for effective inhibitors.
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Affiliation(s)
- M. Vinkovic
- Astex Therapeutics, 436 Cambridge Science Park, Milton Road, Cambridge CB4 0QA, England
- Department of Crystallography, Birkbeck College, Malet Street, London WC1E 7HX, England
| | - G. Dunn
- School of Biological Science, University of Southampton, Highfield, Southampton SO16 7PX, England
| | - G. E. Wood
- Poole Hospital NHS Foundation Trust, Longfleet Road, Poole BH15 2JB, England
| | - J. Husain
- Department of Crystallography, Birkbeck College, Malet Street, London WC1E 7HX, England
| | - S. P. Wood
- Laboratory of Protein Crystallography, Centre for Amyloidosis and Acute Phase Proteins, UCL Division of Medicine (Royal Free Campus), Rowland Hill Street, London NW3 2PF, England
| | - R. Gill
- Laboratory of Protein Crystallography, Centre for Amyloidosis and Acute Phase Proteins, UCL Division of Medicine (Royal Free Campus), Rowland Hill Street, London NW3 2PF, England
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Kumar A, Singhal NK, Ramanujam B, Mitra A, Rameshwaram NR, Nadimpalli SK, Rao CP. C(1)-/C(2)-aromatic-imino-glyco-conjugates: experimental and computational studies of binding, inhibition and docking aspects towards glycosidases isolated from soybean and jack bean. Glycoconj J 2009; 26:495-510. [PMID: 18953653 DOI: 10.1007/s10719-008-9199-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2008] [Revised: 09/24/2008] [Accepted: 10/01/2008] [Indexed: 11/28/2022]
Abstract
Several C(1)-imino conjugates of D: -galactose, D: -lactose and D: -ribose, where the nitrogen center was substituted by the salicylidene or naphthylidene, were synthesized and characterized. Similar C(2)-imino conjugates of D: -glucose have also been synthesized. All the glyco-imino-conjugates, which are transition state analogues, exhibited 100% inhibition of the activity towards glycosidases extracted from soybean and jack bean meal. Among these, a galactosyl-napthyl-imine-conjugate (1c) showed 50% inhibition of the activity of pure alpha-mannosidase from jack bean at 22 +/- 2.5 microM, and a ribosyl-naphthyl-imine-conjugate (3c) showed at 31 +/- 5.5 microM and hence these conjugates are potent inhibitors of glycosidases. The kinetic studies suggested non-competitive inhibition by these conjugates. The studies are also suggestive of the involvement of aromatic, imine and carbohydrate moieties of the glyco-imino-conjugates in the effective inhibition. The binding of glyco-imino-conjugate has been established by extensive studies carried out using fluorescence emission and isothermal titration calorimetry. The conformational changes resulted in the enzyme upon interaction of these derivatives has been established by studying the fluorescence quench of the enzyme by KI as well as from the secondary structural changes noticed in CD spectra. All these studies revealed the difference in the binding strengths of the naphthylidene vs. salicylidene as well as galactosyl vs. lactosyl moieties present in these conjugates. The differential inhibition of these glyco-conjugates has been addressed by quantifying the specific interactions present between the glyco-conjugates and the enzyme by using rigid docking studies.
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Affiliation(s)
- Amit Kumar
- Bioinorganic Laboratory, Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, 400 076, India
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Zhang K, Xu J, Huang X, Wu L, Wen C, Hu Y, Su Y, Chen Y, Zhang Z. Trichosanthin down-regulated p210Bcr-Abl and enhanced imatinib-induced growth arrest in chronic myelogenous leukemia cell line K562. Cancer Chemother Pharmacol 2007; 60:581-7. [PMID: 17435997 DOI: 10.1007/s00280-007-0457-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2006] [Accepted: 03/04/2007] [Indexed: 11/28/2022]
Abstract
PURPOSE Trichosanthin (TCS), an active component extracted from the root tubers of traditional Chinese medical herb Tian-Hua-Fen of the Cucurbitaceae family, has long been used for medical purpose in China; there is increasing interest in developing TCS as cancer therapeutic agents. The present study was to investigate the growth arrest of K562 cells and its molecular mechanisms, which the drugs induced by TCS and the possible functional interaction of TCS with imatinib (STI571) to K562 cells. METHODS Trypan blue exclusive staining was used to access the cell growth inhibition; western blot was used to evaluate the p210(Bcr-Abl), phosphorylated tyrosine kinase (PTK), and some signaling molecules involving in cell proliferation and apoptosis in K562 cells. RESULTS TCS and imatinib inhibited K562 cells at a time- and dose-dependent manners, respectively; TCS down-regulated p210(Bcr-Abl) at a time- and dose-dependent manners; TCS synergistically enhanced imatinib-induced K562 cell growth arrest and down-regulation of p210(Bcr-Abl), PTK activities, procaspase-3, Hsp90,NF-kappaB and PKC. CONCLUSION The results suggest that TCS not only by itself involves but also synergizes activities of imatinib to induce K562 cell growth arrest, down-regulation of p210(Bcr-Abl) and its downstream signals and to stimulate the effect of the tyrosine kinase inhibition.
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Affiliation(s)
- Kunzhong Zhang
- Institute of Clinical Pharmacology, School of Pharmacy, Fujian Medical University, Fujian 350004, People's Republic China
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Chan DS, Chu LO, Lee KM, Too PH, Ma KW, Sze KH, Zhu G, Shaw PC, Wong KB. Interaction between trichosanthin, a ribosome-inactivating protein, and the ribosomal stalk protein P2 by chemical shift perturbation and mutagenesis analyses. Nucleic Acids Res 2007; 35:1660-72. [PMID: 17308345 PMCID: PMC1865052 DOI: 10.1093/nar/gkm065] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Trichosanthin (TCS) is a type I ribosome-inactivating protein that inactivates ribosome by enzymatically depurinating the A4324 at the α-sarcin/ricin loop of 28S rRNA. We have shown in this and previous studies that TCS interacts with human acidic ribosomal proteins P0, P1 and P2, which constitute the lateral stalk of eukaryotic ribosome. Deletion mutagenesis showed that TCS interacts with the C-terminal tail of P2, the sequences of which are conserved in P0, P1 and P2. The P2-binding site on TCS was mapped to the C-terminal domain by chemical shift perturbation experiments. Scanning charge-to-alanine mutagenesis has shown that K173, R174 and K177 in the C-terminal domain of TCS are involved in interacting with the P2, presumably through forming charge–charge interactions to the conserved DDD motif at the C-terminal tail of P2. A triple-alanine variant K173A/R174A/K177A of TCS, which fails to bind P2 and ribosomal stalk in vitro, was found to be 18-fold less active in inhibiting translation in rabbit reticulocyte lysate, suggesting that interaction with P-proteins is required for full activity of TCS. In an analogy to the role of stalk proteins in binding elongation factors, we propose that interaction with acidic ribosomal stalk proteins help TCS to locate its RNA substrate.
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Affiliation(s)
- Denise S.B. Chan
- Department of Biochemistry, Centre for Protein Science and Crystallography and Molecular Biotechnology Programme, The Chinese University of Hong Kong, Shatin, Hong Kong, China, Department of Chemistry, The University of Hong Kong, Pokfulam, Hong Kong, China and Department of Biochemistry, The Hong Kong University of Science and Technology, Clear Water Bay, New Territories, Hong Kong, China
| | - Lai-On Chu
- Department of Biochemistry, Centre for Protein Science and Crystallography and Molecular Biotechnology Programme, The Chinese University of Hong Kong, Shatin, Hong Kong, China, Department of Chemistry, The University of Hong Kong, Pokfulam, Hong Kong, China and Department of Biochemistry, The Hong Kong University of Science and Technology, Clear Water Bay, New Territories, Hong Kong, China
| | - Ka-Ming Lee
- Department of Biochemistry, Centre for Protein Science and Crystallography and Molecular Biotechnology Programme, The Chinese University of Hong Kong, Shatin, Hong Kong, China, Department of Chemistry, The University of Hong Kong, Pokfulam, Hong Kong, China and Department of Biochemistry, The Hong Kong University of Science and Technology, Clear Water Bay, New Territories, Hong Kong, China
| | - Priscilla H.M. Too
- Department of Biochemistry, Centre for Protein Science and Crystallography and Molecular Biotechnology Programme, The Chinese University of Hong Kong, Shatin, Hong Kong, China, Department of Chemistry, The University of Hong Kong, Pokfulam, Hong Kong, China and Department of Biochemistry, The Hong Kong University of Science and Technology, Clear Water Bay, New Territories, Hong Kong, China
| | - Kit-Wan Ma
- Department of Biochemistry, Centre for Protein Science and Crystallography and Molecular Biotechnology Programme, The Chinese University of Hong Kong, Shatin, Hong Kong, China, Department of Chemistry, The University of Hong Kong, Pokfulam, Hong Kong, China and Department of Biochemistry, The Hong Kong University of Science and Technology, Clear Water Bay, New Territories, Hong Kong, China
| | - Kong-Hung Sze
- Department of Biochemistry, Centre for Protein Science and Crystallography and Molecular Biotechnology Programme, The Chinese University of Hong Kong, Shatin, Hong Kong, China, Department of Chemistry, The University of Hong Kong, Pokfulam, Hong Kong, China and Department of Biochemistry, The Hong Kong University of Science and Technology, Clear Water Bay, New Territories, Hong Kong, China
| | - Guang Zhu
- Department of Biochemistry, Centre for Protein Science and Crystallography and Molecular Biotechnology Programme, The Chinese University of Hong Kong, Shatin, Hong Kong, China, Department of Chemistry, The University of Hong Kong, Pokfulam, Hong Kong, China and Department of Biochemistry, The Hong Kong University of Science and Technology, Clear Water Bay, New Territories, Hong Kong, China
| | - Pang-Chui Shaw
- Department of Biochemistry, Centre for Protein Science and Crystallography and Molecular Biotechnology Programme, The Chinese University of Hong Kong, Shatin, Hong Kong, China, Department of Chemistry, The University of Hong Kong, Pokfulam, Hong Kong, China and Department of Biochemistry, The Hong Kong University of Science and Technology, Clear Water Bay, New Territories, Hong Kong, China
| | - Kam-Bo Wong
- Department of Biochemistry, Centre for Protein Science and Crystallography and Molecular Biotechnology Programme, The Chinese University of Hong Kong, Shatin, Hong Kong, China, Department of Chemistry, The University of Hong Kong, Pokfulam, Hong Kong, China and Department of Biochemistry, The Hong Kong University of Science and Technology, Clear Water Bay, New Territories, Hong Kong, China
- *To whom correspondence should be addressed. 852 2609 8024852 2603 7732 Correspondence may also be addressed to Pang-Chui Shaw. 852 2609 6803 852 2603 5123;
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13
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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.
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Affiliation(s)
- Qunxing An
- Department of Microbiology, Fourth Medical University of PLA, Xi'an, 710032, China
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14
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Fermani S, Falini G, Ripamonti A, Polito L, Stirpe F, Bolognesi A. The 1.4 anstroms structure of dianthin 30 indicates a role of surface potential at the active site of type 1 ribosome inactivating proteins. J Struct Biol 2005; 149:204-12. [PMID: 15681236 DOI: 10.1016/j.jsb.2004.11.007] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2004] [Revised: 11/03/2004] [Indexed: 11/16/2022]
Abstract
Ribosome inactivating proteins (RIPs) are plant proteins with enzymatic activity identified as rRNA N-glycosidase (EC 3.2.2.22), which cleaves the N-glycosidic bond of a specific adenine on the ricin/sarcin region of rRNA, thus causing inhibition of protein synthesis. They also depurinate extensively DNA and other polynucleotides. The three-dimensional structure of dianthin 30, a type 1 (single-chain) RIP of Dianthus caryophyllus (leaves), is now described at 1.4 angstroms, a resolution never achieved before for any RIP. The fold typical of RIPs is conserved, despite some differences in the loop regions. The general structure comparison by superimposed alpha-carbon (249 atoms) and the sequence alignment by structure for dianthin 30 and saporin-S6 give a root mean square deviation of 0.625 angstroms. Despite the differences reported for the biological activities of the two RIPs, their structures fit quite well and both show a protein segment containing strands beta7, beta8, and beta9 shorter than other RIPs. However, the surface electrostatic potential in the active site region neatly distinguishes dianthin 30 from saporin-S6. The possible relationship between the charge distribution and the behavior of the proteins toward different substrates is discussed.
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Affiliation(s)
- Simona Fermani
- Dipartimento di Chimica G. Ciamician, Alma Mater Studiorum Universita' di Bologna, via Selmi 2, I-40126 Bologna, Italy
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15
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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.
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Affiliation(s)
- Xiao-Feng Xia
- Department of Biological Sciences and Biotechnology, State-Key Laboratory of Biomembrane, Tsinghua University, Beijing 100084, China
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16
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Quevillon-Cheruel S, Leulliot N, Meyer P, Graille M, Bremang M, Blondeau K, Sorel I, Poupon A, Janin J, van Tilbeurgh H. Crystal structure of the bifunctional chorismate synthase from Saccharomyces cerevisiae. J Biol Chem 2003; 279:619-25. [PMID: 14573601 DOI: 10.1074/jbc.m310380200] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Chorismate synthase (EC 4.2.3.5), the seventh enzyme in the shikimate pathway, catalyzes the transformation of 5-enolpyruvylshikimate 3-phosphate (EPSP) to chorismate, which is the last common precursor in the biosynthesis of numerous aromatic compounds in bacteria, fungi, and plants. The chorismate synthase reaction involves a 1,4-trans-elimination of phosphoric acid from EPSP and has an absolute requirement for reduced FMN as a cofactor. We have determined the three-dimensional x-ray structure of the yeast chorismate synthase from selenomethionine-labeled crystals at 2.2-A resolution. The structure shows a novel betaalphabetaalpha fold consisting of an alternate tight packing of two alpha-helical and two beta-sheet layers, showing no resemblance to any documented protein structure. The molecule is arranged as a tight tetramer with D2 symmetry, in accordance with its quaternary structure in solution. Electron density is missing for 23% of the amino acids, spread over sequence regions that in the three-dimensional structure converge on the surface of the protein. Many totally conserved residues are contained within these regions, and they probably form a structured but mobile domain that closes over a cleft upon substrate binding and catalysis. This hypothesis is supported by previously published spectroscopic measurements implying that the enzyme undergoes considerable structural changes upon binding of both FMN and EPSP.
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Affiliation(s)
- Sophie Quevillon-Cheruel
- Institut de Biochimie et de Biophysique Moléculaire et Cellulaire (CNRS-UMR 8619), Université Paris-Sud, Bâtiment 430, 91405 Orsay, France
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17
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Hellings M, De Maeyer M, Verheyden S, Hao Q, Van Damme EJM, Peumans WJ, Engelborghs Y. The dead-end elimination method, tryptophan rotamers, and fluorescence lifetimes. Biophys J 2003; 85:1894-902. [PMID: 12944302 PMCID: PMC1303361 DOI: 10.1016/s0006-3495(03)74617-7] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2002] [Accepted: 05/30/2003] [Indexed: 11/17/2022] Open
Abstract
The Dead-End Elimination method was used to identify 40 low energy microconformations of 16 tryptophan residues in eight proteins. Single Trp-mutants of these proteins all show a double- or triple-exponential fluorescence decay. For ten of these lifetimes the corresponding rotameric state could be identified by comparing the bimolecular acrylamide quenching constant (k(q)) and the relative solvent exposure of the side chain in that microstate. In the absence of any identifiable quencher, the origin of the lifetime heterogeneity is interpreted in terms of the electron transfer process from the indole C epsilon 3 atom to the carbonyl carbon of the peptide bond. Therefore it is expected that a shorter [C epsilon 3-C[double bond]O] distance leads to a shorter lifetime as observed for these ten rotamers. Applying the same rule to the other 30 lifetimes, a link with their corresponding rotameric state could also be made. In agreement with the theory of Marcus and Sutin, the nonradiative rate constant shows an exponential relationship with the [C epsilon 3-C[double bond]O] distance for the 40 datapoints.
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Affiliation(s)
- Mario Hellings
- Laboratory of Biomolecular Dynamics, Catholic University of Leuven, Heverlee, Belgium
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18
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Shaw PC, Wong KB, Chan DSB, Williams RL. Structural basis for the interaction of [E160A-E189A]-trichosanthin with adenine. Toxicon 2003; 41:575-81. [PMID: 12676436 DOI: 10.1016/s0041-0101(02)00387-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Trichosanthin is a ribosome-inactivating protein that cleaves specifically the N-glycosidic bond of A-4324 of 28S rRNA. Trichosanthin and its variant [E160A-E189A]-trichosanthin were found to bind an adenine base with a K(d) value of approximately 0.2mM. To determine how this doubly mutated variant of trichosanthin interacts with adenine, the co-crystal structure of [E160A-E189A]-trichosanthin and adenine was resolved to 0.193nm which revealed that the active site conformation of the doubly mutated variant is isomorphous to wild-type trichosanthin. Water molecules were found at locations corresponding to the eliminated side chain of Glu-160 and Glu-189. On the other hand, the adenine base interacted with [E160A-E189A]-trichosanthin in a manner similar to that in wild-type trichosanthin. Our structural analysis illustrates that Glu-160 and Glu-189 in trichosanthin do not play an important role in maintaining the active site conformation and binding adenine, an essential step for substrate-enzyme interaction. On the other hand, removal of two glutamate residues changed a large patch of negatively charged surface to a positive charge, which may account for the destabilization of the oxocarbenium-like transition-state and the significant decrease in ribosome-inactivating activity in [E160A-E189A]-trichosanthin.
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Affiliation(s)
- Pang-Chui Shaw
- Department of Biochemistry, The Chinese University of Hong Kong, Shatin, NT, Hong Kong, People's Republic of China.
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19
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Kho R, Baker BL, Newman JV, Jack RM, Sem DS, Villar HO, Hansen MR. A path from primary protein sequence to ligand recognition. Proteins 2003; 50:589-99. [PMID: 12577265 DOI: 10.1002/prot.10316] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
A novel method to organize protein structural information based solely on sequence is presented. The method clusters proteins into families that correlate with the three-dimensional protein structure and the conformation of the bound ligands. This procedure was applied to nicotinamide adenine dinucleotide [NAD(P)]-utilizing enzymes to identify a total of 94 sequence families, 53 of which are structurally characterized. Each of the structurally characterized proteins within a sequence family correlates to a single protein fold and to a common bound conformation of NAD(P). A wide range of structural folds is identified that recognize NAD(P), including Rossmann folds and beta/alpha barrels. The defined sequence families can be used to identify the type and prevalence of NAD(P)-utilizing enzymes in the proteomes of sequenced organisms. The proteome of Mycobacterium tuberculosis was mined to generate a proteome-wide profile of NAD(P)-utilizing enzymes coded by this organism. This enzyme family comprises approximately 6% of the open reading frames, with the largest subgroup being the Rossmann fold, short-chain dehydrogenases. The preponderance of short-chain dehydrogenases correlates strongly with the phenotype of M. tuberculosis, which is characterized as having one of the most complex prokaryotic cell walls.
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Affiliation(s)
- Richard Kho
- Triad Therapeutics, Inc., San Diego, CA 92121, USA
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20
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Cai X, Yao G, Xu G, Yang C, Xu H, Lin Y, Yu J, Sun B. Identification of the amino acid residues in trichosanthin crucial for IgE response. Biochem Biophys Res Commun 2002; 297:510-6. [PMID: 12270124 DOI: 10.1016/s0006-291x(02)02076-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Trichosanthin (TCS) is the major effective component from Chinese herb Trichosanthes kirilowii. TCS has been approved to be effective in clinical treatment of HIV infection and leukemia, but its allergenicity has limited its clinical usage. To identify amino acid residues in TCS with an important role in IgE induction, TCS-specific IgE mAb (TE1) was used to serve as a probe and TE1 epitope was determined by a random phage-peptide library. Based on phage peptide sequences, TE1 epitope was predicted at amino acid residues 169-174 (QQIGKR) of TCS protein. Based on modeling data, two amino acids (Lys173 and Arg174) on TCS were considered to have a crucial role in binding to TE1. After lysine 173 and arginine 174 were mutated to glycine, the mutant TCS protein specifically lost the binding activity to TE1 mAb and exhibited reduced IgE induction in the immunized mice. The data showed that the IgE epitope of TCS was determined and shown to play a critical role in induction of IgE, and the modification of IgE-epitope may be a useful strategy to reduce the allergenicity of an allergen.
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Affiliation(s)
- Xuan Cai
- Laboratory of Molecular Immunology, Institute of Biochemistry and Cell Biology, Shanghai Institute for Biological Sciences, Chinese Academy of Sciences, 320 Yueyang Road, Shanghai 200031, People's Republic of China
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21
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22
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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.
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Affiliation(s)
- X F Xia
- State Key Laboratory of Biomembrane, Department of Biological Sciences and Biotechnology, Tsinghua University, 100084, Beijing, PR China
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23
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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.
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Affiliation(s)
- Q Hao
- Laboratory of Phytopathology and Plant Protection, Katholieke Universiteit Leuven, Willem de Croylaan 42, Leuven, 3001, Belgium
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24
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Gu Y, Chen W, Xia Z. Molecular modeling of the interactions of trichosanthin with four substrate analogs. JOURNAL OF PROTEIN CHEMISTRY 2000; 19:291-7. [PMID: 11043934 DOI: 10.1023/a:1007047413373] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Trichosanthin (TCS) is a ribosome-inactivating protein (RIP) that possesses N-glycosidase activity. It inactivates ribosomes and arrests protein synthesis by removing a specific adenine from 28S rRNA. A molecular dynamics simulated annealing method was applied to study the binding modes of TCS with substrate analogs, three oligonucleotides GAG, GAGA, and CGAGAG, based on the crystal structures of the stable complexes of TCS with NADPH and with the reaction product adenine. A water molecule proposed to be responsible for hydrolyzing the N-glycosidic bond was included in the model. All the oligoribonucleotides can dock into the active cleft of TCS without unfavorable contacts. The interaction energies between TCS and the three oligonucleotides were calculated. The interactions of TCS with NADH were also studied by a molecular dynamics simulated annealing method. The interaction energy between NADH and TCS was compared with that between NADPH and TCS, showing that the lack of 2'-phosphate group leads to an energy rise of 20 kcal/mol.
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Affiliation(s)
- Y Gu
- State Key Laboratory of Bio-organic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences
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25
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Gu YJ, Xia ZX. Crystal structures of the complexes of trichosanthin with four substrate analogs and catalytic mechanism of RNA N-glycosidase. Proteins 2000. [DOI: 10.1002/(sici)1097-0134(20000401)39:1<37::aid-prot4>3.0.co;2-g] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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26
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Yan L, Wu S, Li HG, Li JH, Wong RN, Shi QL, Dong YC. Role of TYR70 in the N-glycosidase activity of neo-trichosanthin. Toxicon 1999; 37:961-72. [PMID: 10484744 DOI: 10.1016/s0041-0101(98)00225-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
Trichosanthin (TCS) is a type I ribosome-inactivating protein (RIP) which possesses rRNA N-glycosidase activity. TCS has long been used as an abortifacient in China. In recent years, its immunomodulatory, anti-tumor and anti-HIV properties have attracted more and more attention. An isoform of trichosanthin, neo-trichosanthin (n-TCS), has been cloned and expressed as recombinant protein. The biochemical studies revealed that n-TCS has virtually the same rRNA N-glycosidase activity as TCS. The crystal structure of n-TCS is similar to TCS. The crystal of Y70A n-TCS, the mutant of recombinant n-TCS, was soaked in sodium citrate buffer (pH 5.5) containing 25% KCl and AMP (10 mg/ml) prior to data collection. After structure determination and refinement, no electron density corresponding to adenine can be detected around the active pocket. Furthermore, the reaction products of Y70A n-TCS and AMP incubated at various reaction times were analyzed using HPLC. No adenine can be detected. These results suggest that Tyr70 is crucial to n-TCS for its substrate recognition, binding and perhaps N-glycosidase activity.
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Affiliation(s)
- L Yan
- Department of Protein Engineering, Institute of Biophysics, Chinese Academy of Sciences, Chaoyang District, Beijing, People's Republic of China
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27
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Eppink MH, Schreuder HA, van Berkel WJ. Interdomain binding of NADPH in p-hydroxybenzoate hydroxylase as suggested by kinetic, crystallographic and modeling studies of histidine 162 and arginine 269 variants. J Biol Chem 1998; 273:21031-9. [PMID: 9694855 DOI: 10.1074/jbc.273.33.21031] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The conserved residues His-162 and Arg-269 of the flavoprotein p-hydroxybenzoate hydroxylase (EC 1.14.13.2) are located at the entrance of the interdomain cleft that leads toward the active site. To study their putative role in NADPH binding, His-162 and Arg-269 were selectively changed by site-specific mutagenesis. The catalytic properties of H162R, H162Y, and R269K were similar to the wild-type enzyme. However, less conservative His-162 and Arg-269 replacements strongly impaired NADPH binding without affecting the conformation of the flavin ring and the efficiency of substrate hydroxylation. The crystal structures of H162R and R269T in complex with 4-hydroxybenzoate were solved at 3.0 and 2.0 A resolution, respectively. Both structures are virtually indistinguishable from the wild-type enzyme-substrate complex except for the substituted side chains. In contrast to wild-type p-hydroxybenzoate hydroxylase, H162R is not inactivated by diethyl pyrocarbonate. NADPH protects wild-type p-hydroxybenzoate hydroxylase from diethylpyrocarbonate inactivation, suggesting that His-162 is involved in NADPH binding. Based on these results and GRID calculations we propose that the side chains of His-162 and Arg-269 interact with the pyrophosphate moiety of NADPH. An interdomain binding mode for NADPH is proposed which takes a novel sequence motif (Eppink, M. H. M., Schreuder, H. A., and van Berkel, W. J. H. (1997) Protein Sci. 6, 2454-2458) into account.
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Affiliation(s)
- M H Eppink
- Department of Biomolecular Sciences, Laboratory of Biochemistry, Wageningen Agricultural University, Dreijenlaan 3, 6703 HA Wageningen, The Netherlands
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28
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Lau CK, Wong RN, Lo SC, Kwok F. Refolding of denatured trichosanthin in the presence of GroEL. Biochem Biophys Res Commun 1998; 245:149-54. [PMID: 9535799 DOI: 10.1006/bbrc.1998.8191] [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
The stability of trichosanthin (TCS), a 27-kDa ribosome-inactivating protein, was investigated in the presence of guanidinium chloride (GdnHCl). The process of unfolding was monitored by CD and fluorescence spectroscopy. Both methods show the presence of partially folded intermediates. Unfolding of TCS is attained in 6M GdnHCl, but the inactive species recover a good deal of its DNase activity upon dilution with buffer containing GroEL and ATP. The mechanism of recognition of unfolded TCS by GroEL was studied by fluorescence spectroscopy.
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Affiliation(s)
- C K Lau
- Department of Biochemistry, The University of Tennessee, Knoxville, Tennessee, 37996-0840, USA
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29
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Nie H, Cai X, He X, Xu L, Ke X, Ke Y, Tam SC. Position 120-123, a potential active site of trichosanthin. Life Sci 1998; 62:491-500. [PMID: 9464461 DOI: 10.1016/s0024-3205(97)01145-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Trichosanthin (TCS) is a type-I ribosome-inactivating protein (RIP) with wide spectrum of biological and pharmacological activities. In the present study, a potential site on the TCS molecule (position 120-123) is identified which may be important for the biological activities of TCS. By using site-directed mutagenesis, position 120-123 of TCS was either deleted or changed from Lys-Ile-Arg-Glu (hydrophilic) to Ser-Ala-Gly-Gly (hydrophobic). Deletion of these residues rendered a TCS molecule completely deprived of ribosome inactivating activity, while hydrophobic replacement caused 4000-fold decrease in ribosome inactivating activity. The abortifacient activity of these two mutants was retained with decreased potency. This implies that position 120-123 of the native TCS molecule plays a critical role in maintaining its biological activity.
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Affiliation(s)
- H Nie
- Shanghai Institute of Cell Biology, Academia Sinica, China
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30
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Dong Y, Zhu Y, Cheng S, Li J, Shaw P. Crystal structure of Q156A trichosanthin. CHINESE SCIENCE BULLETIN-CHINESE 1997. [DOI: 10.1007/bf02882868] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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31
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Shaw PC, Mulot S, Ma SK, Xu QF, Yao HB, Wu S, Lu XH, Dong YC. Structure/function relationship study of Tyr14 and Arg22 in trichosanthin, a ribosome-inactivating protein. EUROPEAN JOURNAL OF BIOCHEMISTRY 1997; 245:423-7. [PMID: 9151974 DOI: 10.1111/j.1432-1033.1997.00423.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Amino acids Tyr14 and Arg22 in trichosanthin are residues on helix A1 close to the active-site cleft. They are invariant in various type-I and type-II ribosome-inactivating proteins. In this study, Tyr14 was changed to Phe and Arg22 to Lys and Leu. Modified proteins were purified, and activities compared by assaying their median inhibitory concentration (ID50) on a rabbit-reticulocyte-lysate protein-synthesis system. While the ID50 of wild-type trichosanthin was 0.02 nM, those for [Phe14], [Lys22], [Leu22] and [Phe14, Leu22]trichosanthin were 0.10, 0.03, 0.25 and 0.15 nM, respectively. Therefore, compared with Tyr14, Arg22 appears to play a more important role in trichosanthin. Structural studies on [Leu22]trichosanthin showed that two water molecules occupy the space left by the side chain of Arg22, and hydrogen bonds exist between these water molecules and nearby residues to retain the conformation. The use of intermolecular rather than intramolecular hydrogen bonds may have an adverse effect on stability or folding of the protein and results in a mild decrease in activity.
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Affiliation(s)
- P C Shaw
- Department of Biochemistry, The Chinese University of Hong Kong, Shatin
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32
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Abstract
Ricin A-chain is a cytotoxic protein that attacks ribosomes by hydrolyzing a specific adenine base from a highly conserved, single-stranded rRNA hairpin containing the tetraloop sequence GAGA. Molecular-dynamics simulation methods are used to analyze the structural determinant for three substrate analogues bound to the ricin A-chain molecule. Simulations were applied to the binding of the dinucleotide adenyl-3',5'-guanosine employing the x-ray crystal structure of the ricin complex and a modeled CGAGAG hexanucleotide loop taken from the NMR solution structure of a 29-mer oligonucleotide hairpin. A third simulation model is also presented describing a conformational search of the docked 29-mer structure by using a simulated-annealing method. Analysis of the structural interaction energies for each model shows the overall binding dominated by nonspecific interactions, which are mediated by specific arginine contracts from the highly basic region on the protein surface. The tetraloop conformation of the 29-mer was found to make specific interactions with conserved protein residues, in a manner that favored the GAGA sequence. A comparison of the two docked loop conformations with the NMR structure revealed significant positional deviations, suggesting that ricin may use an induced fit mechanism to recognize and bind the rRNA substrate. The conserved Tyr-80 may play an important conformational entropic role in the binding and release of the target adenine in the active site.
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Affiliation(s)
- M A Olson
- Department of Cell Biology and Biochemistry, U.S. Army Medical Research Institute of Infectious Diseases, Frederick, Maryland 21702-5011, USA
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Xiong JP, Xia ZX, Wang Y. Identification of a stable complex of trichosanthin with nicotinamide adenine dinucleotide phosphate. JOURNAL OF PROTEIN CHEMISTRY 1995; 14:139-44. [PMID: 7576081 DOI: 10.1007/bf01980325] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Trichosanthin, a type I ribosome-inactivating protein with RNA N-glycosidase activity, forms a stable complex with nicotinamide adenine dinucleotide phosphate, a substrate analog. Difference UV spectroscopy, fluorescence spectroscopy, and 31P NMR are used to identify the formation of the complex, followed by a crystal structure analysis carried out to elucidate the active-site structure of trichosanthin. The determination of germinal vesicle breakdown indicates that the complex does not, at least for abortion-inducing activity, result in competitive inhibition to the protein.
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Affiliation(s)
- J P Xiong
- Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences
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