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Cao Y, Zhu H, He R, Kong L, Shao J, Zhuang R, Xi J, Zhang J. Proteasome, a Promising Therapeutic Target for Multiple Diseases Beyond Cancer. DRUG DESIGN DEVELOPMENT AND THERAPY 2020; 14:4327-4342. [PMID: 33116419 PMCID: PMC7585272 DOI: 10.2147/dddt.s265793] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Accepted: 09/22/2020] [Indexed: 12/14/2022]
Abstract
Proteasome is vital for intracellular protein homeostasis as it eliminates misfolded and damaged protein. Inhibition of proteasome has been validated as a powerful strategy for anti-cancer therapy, and several drugs have been approved for treatment of multiple myeloma. Recent studies indicate that proteasome has potent therapeutic effects on a variety of diseases besides cancer, including parasite infectious diseases, bacterial/fungal infections diseases, neurodegenerative diseases and autoimmune diseases. In this review, recent developments of proteasome inhibitors for various diseases and related structure activity relationships are going to be summarized.
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Affiliation(s)
- Yu Cao
- School of Medicine, Zhejiang University City College, Hangzhou, Zhejiang Province, 310015, People's Republic of China
| | - Huajian Zhu
- School of Medicine, Zhejiang University City College, Hangzhou, Zhejiang Province, 310015, People's Republic of China
| | - Ruoyu He
- Department of Pharmaceutical Preparation, Hangzhou Xixi Hospital, Hangzhou, Zhejiang Province, 310023 People's Republic of China
| | - Limin Kong
- Department of Pharmacy, The First Affiliated Hospital, Zhejiang University, Hangzhou, Zhejiang Province, 310003, People's Republic of China
| | - Jiaan Shao
- School of Medicine, Zhejiang University City College, Hangzhou, Zhejiang Province, 310015, People's Republic of China
| | - Rangxiao Zhuang
- Department of Pharmaceutical Preparation, Hangzhou Xixi Hospital, Hangzhou, Zhejiang Province, 310023 People's Republic of China
| | - Jianjun Xi
- Department of Pharmaceutical Preparation, Hangzhou Xixi Hospital, Hangzhou, Zhejiang Province, 310023 People's Republic of China
| | - Jiankang Zhang
- School of Medicine, Zhejiang University City College, Hangzhou, Zhejiang Province, 310015, People's Republic of China
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Koszela J, Pham NT, Evans D, Mann S, Perez-Pi I, Shave S, Ceccarelli DFJ, Sicheri F, Tyers M, Auer M. Real-time tracking of complex ubiquitination cascades using a fluorescent confocal on-bead assay. BMC Biol 2018; 16:88. [PMID: 30097011 PMCID: PMC6086040 DOI: 10.1186/s12915-018-0554-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2018] [Accepted: 07/24/2018] [Indexed: 12/05/2022] Open
Abstract
BACKGROUND The ubiquitin-proteasome system (UPS) controls the stability, localization and/or activity of the proteome. However, the identification and characterization of complex individual ubiquitination cascades and their modulators remains a challenge. Here, we report a broadly applicable, multiplexed, miniaturized on-bead technique for real-time monitoring of various ubiquitination-related enzymatic activities. The assay, termed UPS-confocal fluorescence nanoscanning (UPS-CONA), employs a substrate of interest immobilized on a micro-bead and a fluorescently labeled ubiquitin which, upon enzymatic conjugation to the substrate, is quantitatively detected on the bead periphery by confocal imaging. RESULTS UPS-CONA is suitable for studying individual enzymatic activities, including various E1, E2, and HECT-type E3 enzymes, and for monitoring multi-step reactions within ubiquitination cascades in a single experimental compartment. We demonstrate the power of the UPS-CONA technique by simultaneously following ubiquitin transfer from Ube1 through Ube2L3 to E6AP. We applied this multi-step setup to investigate the selectivity of five ubiquitination inhibitors reportedly targeting different classes of ubiquitination enzymes. Using UPS-CONA, we have identified a new activity of a small molecule E2 inhibitor, BAY 11-7082, and of a HECT E3 inhibitor, heclin, towards the Ube1 enzyme. CONCLUSIONS As a sensitive, quantitative, flexible, and reagent-efficient method with a straightforward protocol, UPS-CONA constitutes a powerful tool for interrogation of ubiquitination-related enzymatic pathways and their chemical modulators, and is readily scalable for large experiments.
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Affiliation(s)
- Joanna Koszela
- Institute of Quantitative Biology, Biochemistry and Biotechnology, School of Biological Sciences, University of Edinburgh, C H Waddington Building, 3.07, Max Born Crescent, Edinburgh, EH9 3BF UK
| | - Nhan T. Pham
- Institute of Quantitative Biology, Biochemistry and Biotechnology, School of Biological Sciences, University of Edinburgh, C H Waddington Building, 3.07, Max Born Crescent, Edinburgh, EH9 3BF UK
| | - David Evans
- Institute of Quantitative Biology, Biochemistry and Biotechnology, School of Biological Sciences, University of Edinburgh, C H Waddington Building, 3.07, Max Born Crescent, Edinburgh, EH9 3BF UK
| | - Stefan Mann
- Institute of Quantitative Biology, Biochemistry and Biotechnology, School of Biological Sciences, University of Edinburgh, C H Waddington Building, 3.07, Max Born Crescent, Edinburgh, EH9 3BF UK
| | - Irene Perez-Pi
- Institute of Quantitative Biology, Biochemistry and Biotechnology, School of Biological Sciences, University of Edinburgh, C H Waddington Building, 3.07, Max Born Crescent, Edinburgh, EH9 3BF UK
| | - Steven Shave
- Institute of Quantitative Biology, Biochemistry and Biotechnology, School of Biological Sciences, University of Edinburgh, C H Waddington Building, 3.07, Max Born Crescent, Edinburgh, EH9 3BF UK
| | - Derek F. J. Ceccarelli
- The Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, 600 University Avenue, Room 1090, Toronto, Ontario M5G 1X5 Canada
| | - Frank Sicheri
- The Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, 600 University Avenue, Room 1090, Toronto, Ontario M5G 1X5 Canada
| | - Mike Tyers
- Institute for Research in Immunology and Cancer, Université de Montréal, Montréal, Québec H3C 3J7 Canada
| | - Manfred Auer
- Institute of Quantitative Biology, Biochemistry and Biotechnology, School of Biological Sciences, University of Edinburgh, C H Waddington Building, 3.07, Max Born Crescent, Edinburgh, EH9 3BF UK
- Biomedical Sciences, Medical School, University of Edinburgh, C H Waddington Building, 3.07, Max Born Crescent, Edinburgh, EH9 3BF UK
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Voltammetric and atomic force microscopy characterization of chymotrypsin, trypsin and caspase activities of proteasome. Catal Today 2018. [DOI: 10.1016/j.cattod.2017.01.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Zaal EA, Wu W, Jansen G, Zweegman S, Cloos J, Berkers CR. Bortezomib resistance in multiple myeloma is associated with increased serine synthesis. Cancer Metab 2017; 5:7. [PMID: 28855983 PMCID: PMC5575874 DOI: 10.1186/s40170-017-0169-9] [Citation(s) in RCA: 114] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2017] [Accepted: 08/14/2017] [Indexed: 12/20/2022] Open
Abstract
Background The proteasome inhibitor bortezomib (BTZ) is successfully applied in the treatment of multiple myeloma, but its efficacy is restricted by the wide-spread occurrence of resistance. Metabolic alterations play an important role in cancer development and aid in the cellular adaptation to pharmacologically changed environments. Metabolic changes could therefore play an essential role in the development of drug resistance. However, specific metabolic pathways that can be targeted to improve bortezomib therapy remain unidentified. Methods We elucidated the metabolic mechanisms underlying bortezomib resistance by using mass spectrometry-based metabolomics and proteomics on BTZ-sensitive and BTZ–resistant multiple myeloma cell lines as well as in a set of CD138+ cells obtained from multiple myeloma patients. Results Our findings demonstrate that a rewired glucose metabolism sustains bortezomib resistance. Mechanistically, this results in higher activity of both the pentose phosphate pathway and serine synthesis pathway, ultimately leading to an increased anti-oxidant capacity of BTZ-resistant cells. Moreover, our results link both serine synthesis pathway activity and expression of 3-phosphoglycerate dehydrogenase (PHGDH), which catalyzes the rate-limiting step of serine synthesis, to bortezomib resistance across different BTZ-resistant multiple myeloma cell lines. Consistently, serine starvation enhanced the cytotoxicity of bortezomib, underscoring the importance of serine metabolism in the response to BTZ. Importantly, in CD138+ cells of clinically bortezomib refractory multiple myeloma patients, PHGDH expression was also markedly increased. Conclusions Our findings indicate that interfering with serine metabolism may be a novel strategy to improve bortezomib therapy and identify PHGDH as a potential biomarker for BTZ resistance. Electronic supplementary material The online version of this article (doi:10.1186/s40170-017-0169-9) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Esther A Zaal
- Biomolecular Mass Spectrometry and Proteomics, Bijvoet Center for Biomolecular Research and Utrecht Institute of Pharmaceutical Sciences, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
| | - Wei Wu
- Biomolecular Mass Spectrometry and Proteomics, Bijvoet Center for Biomolecular Research and Utrecht Institute of Pharmaceutical Sciences, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
| | - Gerrit Jansen
- Amsterdam Rheumatology and Immunology Center-Location VUMC, VU University Medical Center, Amsterdam, The Netherlands
| | - Sonja Zweegman
- Department of Hematology, VU University Medical Center, Amsterdam, The Netherlands
| | - Jacqueline Cloos
- Department of Hematology, VU University Medical Center, Amsterdam, The Netherlands.,Pediatric Oncology/Hematology, VU University Medical Center, Amsterdam, The Netherlands
| | - Celia R Berkers
- Biomolecular Mass Spectrometry and Proteomics, Bijvoet Center for Biomolecular Research and Utrecht Institute of Pharmaceutical Sciences, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
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Blanco B, Palasis KA, Adwal A, Callen DF, Abell AD. Azobenzene-containing photoswitchable proteasome inhibitors with selective activity and cellular toxicity. Bioorg Med Chem 2017. [PMID: 28642029 DOI: 10.1016/j.bmc.2017.06.011] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
A series of azobenzene-containing peptidic boronate esters was prepared and the activity of the thermally adapted states (TAS), enriched in trans isomer, and the photostationary states (PSS), enriched in cis isomer, for each compound were evaluated against β5 and β1 proteasome subunits. Compounds with a sterically demanding phenyl-substituted azobenzene at P2 (4c), and a less sterically demanding unsubstituted azobenzene at the N-terminus (5a), showed the greatest difference in activity between the two states. In both cases, the more active trans-enriched TAS had activity comparable to bortezomib and delanzomib. Furthermore, cis-enriched 4c inhibited tumor growth in both breast and colorectal carcinoma cell lines. Significantly, the initial trans-enriched TAS of 4c was not cytotoxic against the non-malignant MCF-10A cells.
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Affiliation(s)
- Beatriz Blanco
- Department of Chemistry, The University of Adelaide, North Terrace, Adelaide, South Australia 5005, Australia
| | - Kathryn A Palasis
- Department of Chemistry, The University of Adelaide, North Terrace, Adelaide, South Australia 5005, Australia; ARC Centre of Excellence for Nanoscale BioPhotonics (CNBP) and Institute of Photonics and Advanced Sensing (IPAS), The University of Adelaide, Adelaide, South Australia 5005, Australia
| | - Alaknanda Adwal
- Centre for Personalised Cancer Medicine, Discipline of Medicine, The University of Adelaide, North Terrace, Adelaide, South Australia 5005, Australia
| | - David F Callen
- Centre for Personalised Cancer Medicine, Discipline of Medicine, The University of Adelaide, North Terrace, Adelaide, South Australia 5005, Australia
| | - Andrew D Abell
- Department of Chemistry, The University of Adelaide, North Terrace, Adelaide, South Australia 5005, Australia; ARC Centre of Excellence for Nanoscale BioPhotonics (CNBP) and Institute of Photonics and Advanced Sensing (IPAS), The University of Adelaide, Adelaide, South Australia 5005, Australia.
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Promoting tumorigenesis in nasopharyngeal carcinoma, NEDD8 serves as a potential theranostic target. Cell Death Dis 2017; 8:e2834. [PMID: 28569775 PMCID: PMC5520881 DOI: 10.1038/cddis.2017.195] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2016] [Revised: 03/28/2017] [Accepted: 03/29/2017] [Indexed: 12/16/2022]
Abstract
Nasopharyngeal carcinoma (NPC), is one of the most common human malignancies in south China, it has the highest recurrence rate and treatment resistance. The underlying molecular mechanisms of NPC relapse and treatment tolerance are not fully understood. In this study, the effects of NEDD8 and NEDD8-activating enzyme inhibitor (MLN4924) on NPC were studied both in vitro and in vivo. Immunohistochemical staining of 197 NPC tissues revealed an elevated NEDD8 expression as an unfavorable independent factor in overall survival and disease-free survival rates. NEDD8 expression was positively correlated with a high risk of death and positivity of lymph node metastasis. Depleted NEDD8 expression by shRNA and inhibited by specific inhibitor MLN4924 dramatically suppressed cell proliferation, cell apoptosis, cell cycle arrest, while ectopic NEDD8 exhibited opposing effects. NEDD8 affected cancer stem cell phenotypes of NPC as assessed in vitro using the cell number of side population (SP) by flow cytometry analysis, colony formation assay, sphere formation assay, and tumor initiation ability in vivo. Downregulation of NEDD8 enhanced the susceptibility of NPC cells to cisplatin and radiation. Moreover, we found that MLN4924 suppressed c-Jun degradation in human NPC cells. Taken together, this report revealed that NEDD8 may act as a novel prognostic marker and MLN4924 may serve as a promising therapeutic target for patients with NPC.
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Nie XH, Ou-yang J, Xing Y, Li DY, Dong XY, Liu RE, Xu RX. Paeoniflorin inhibits human glioma cells via STAT3 degradation by the ubiquitin-proteasome pathway. DRUG DESIGN DEVELOPMENT AND THERAPY 2015; 9:5611-22. [PMID: 26508835 PMCID: PMC4610779 DOI: 10.2147/dddt.s93912] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
We investigated the underlying mechanism for the potent proapoptotic effect of paeoniflorin (PF) on human glioma cells in vitro, focusing on signal transducer and activator of transcription 3 (STAT3) signaling. Significant time- and dose-dependent apoptosis and inhibition of proliferation were observed in PF-treated U87 and U251 glioma cells. Expression of STAT3, its active form phosphorylated STAT3 (p-STAT3), and several downstream molecules, including HIAP, Bcl-2, cyclin D1, and Survivin, were significantly downregulated upon PF treatment. Overexpression of STAT3 induced resistance to PF, suggesting that STAT3 was a critical target of PF. Interestingly, rapid downregulation of STAT3 was consistent with its accelerated degradation, but not with its dephosphorylation or transcriptional modulation. Using specific inhibitors, we demonstrated that the prodegradation effect of PF on STAT3 was mainly through the ubiquitin-proteasome pathway rather than via lysosomal degradation. These findings indicated that PF-induced growth suppression and apoptosis in human glioma cells through the proteasome-dependent degradation of STAT3.
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Affiliation(s)
- Xiao-hu Nie
- Affiliated Bayi Brain Hospital, Southern Medical University, Beijing, People's Republic of China
| | - Jia Ou-yang
- Nanchang University Medical College, Jiangxi, People's Republic of China
| | - Ying Xing
- Department of Gastroenterology, The 98th Hospital of Nanjing Military Command, Huzhou, Zhejiang, People's Republic of China
| | - Dan-yan Li
- Spleen & Stomach Institution, Guangzhou University of Traditional Chinese Medicine, Guangdong, People's Republic of China
| | - Xing-yu Dong
- Affiliated Bayi Brain Hospital, Southern Medical University, Beijing, People's Republic of China
| | - Ru-en Liu
- Department of Neurosurgery, China-Japan Friendship Hospital, Beijing, People's Republic of China
| | - Ru-xiang Xu
- Bayi Brain Hospital, The Military General Hospital of Beijing PLA, Beijing, People's Republic of China
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Lee S, Kim J, Jung S, Li C, Yang Y, Kim KI, Lim JS, Kim Y, Cheon CI, Lee MS. SIAH1-induced p34SEI-1 polyubiquitination/degradation mediates p53 preferential vitamin C cytotoxicity. Int J Oncol 2015; 46:1377-84. [PMID: 25586269 DOI: 10.3892/ijo.2015.2840] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2014] [Accepted: 11/26/2014] [Indexed: 11/06/2022] Open
Abstract
Vitamin C is considered as an important anticancer therapeutic agent although this view is debatable. In this study, we introduce a physiological mechanism demonstrating how vitamin C exerts anticancer activity that induces cell cycle arrest and apoptosis. Our previous and current data reveal that p53 tumor suppressor is the prerequisite factor for stronger anticancer effects of vitamin C. In addition, vitamin C-mediated cancer cell cytotoxicity appears to be achieved at least partly through the downregulation of the p34SEI-1 oncoprotein. Our previous study showed that p34SEI-1 increases the survival of various types of cancer cells by inhibiting their apoptosis. Present data suggest that vitamin C treatment decreases the p34SEI-1 expression at the protein level and therefore alleviates its anti-apoptotic activity. Of note, SIAH1, E3 ubiquitin ligase, appears to be responsible for the p34SEI-1 polyubiquitination and its subsequent degradation, which is dependent on p53. In summary, vitamin C increases cancer cell death by inducing SIAH1-mediated polyubiquitination/degradation of the p34SEI-1 oncoprotein in a p53-dependent manner.
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Affiliation(s)
- Soonduck Lee
- Department of Life Systems, Sookmyung Women's University, Seoul 140-742, Republic of Korea
| | - Jinsun Kim
- Department of Life Systems, Sookmyung Women's University, Seoul 140-742, Republic of Korea
| | - Samil Jung
- Department of Life Systems, Sookmyung Women's University, Seoul 140-742, Republic of Korea
| | - Chengping Li
- Department of Life Systems, Sookmyung Women's University, Seoul 140-742, Republic of Korea
| | - Young Yang
- Department of Life Systems, Sookmyung Women's University, Seoul 140-742, Republic of Korea
| | - Keun Il Kim
- Department of Life Systems, Sookmyung Women's University, Seoul 140-742, Republic of Korea
| | - Jong-Seok Lim
- Department of Life Systems, Sookmyung Women's University, Seoul 140-742, Republic of Korea
| | - Yonghwan Kim
- Department of Life Systems, Sookmyung Women's University, Seoul 140-742, Republic of Korea
| | - Choong-Il Cheon
- Department of Life Systems, Sookmyung Women's University, Seoul 140-742, Republic of Korea
| | - Myeong-Sok Lee
- Department of Life Systems, Sookmyung Women's University, Seoul 140-742, Republic of Korea
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Stein ML, Groll M. Applied techniques for mining natural proteasome inhibitors. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2013; 1843:26-38. [PMID: 23360979 DOI: 10.1016/j.bbamcr.2013.01.017] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2012] [Accepted: 01/14/2013] [Indexed: 11/17/2022]
Abstract
In eukaryotic cells, the ubiquitin-proteasome-system (UPS) is responsible for the non-lysosomal degradation of proteins and plays a pivotal role in such vital processes as protein homeostasis, antigen processing or cell proliferation. Therefore, it is an attractive drug target with various applications in cancer and immunosuppressive therapies. Being an evolutionary well conserved pathway, many pathogenic bacteria have developed small molecules, which modulate the activity of their hosts' UPS components. Such natural products are, due to their stepwise optimization over the millennia, highly potent in terms of their binding mechanisms, their bioavailability and selectivity. Generally, this makes bioactive natural products an ideal starting point for the development of novel drugs. Since four out of the ten best seller drugs are natural product derivatives, research in this field is still of unfathomable value for the pharmaceutical industry. The currently most prominent example for the successful exploitation of a natural compound in the UPS field is carfilzomib (Kyprolis®), which represents the second FDA approved drug targeting the proteasome after the admission of the blockbuster bortezomib (Velcade®) in 2003. On the other hand side of the spectrum, ONX 0914, which is derived from the same natural product as carfilzomib, has been shown to selectively inhibit the immune response related branch of the pathway. To date, there exists a huge potential of UPS inhibitors with regard to many diseases. Both approved drugs against the proteasome show severe side effects, adaptive resistances and limited applicability, thus the development of novel compounds with enhanced properties is a main objective of active research. In this review, we describe the techniques, which can be utilized for the discovery of novel natural inhibitors, which in particular block the 20S proteasomal activity. In addition, we will illustrate the successful implementation of a recently published methodology with the example of a highly potent but so far unexploited group of proteasome inhibitors, the syrbactins, and their biological functions. This article is part of a Special Issue entitled: Ubiquitin-Proteasome System. Guest Editors: Thomas Sommer and Dieter H. Wolf.
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Affiliation(s)
- Martin L Stein
- Center for Integrated Protein Science at the Department Chemie, Lehrstuhl für Biochemie, Technische Unversität München, Lichtenbergstraße 4, 85748 Garching, Germany.
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Choi M, Shi J, Jung SH, Chen X, Cho KH. Attractor landscape analysis reveals feedback loops in the p53 network that control the cellular response to DNA damage. Sci Signal 2012; 5:ra83. [PMID: 23169817 DOI: 10.1126/scisignal.2003363] [Citation(s) in RCA: 126] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The protein p53 functions as a tumor suppressor and can trigger either cell cycle arrest or apoptosis in response to DNA damage. We used Boolean network modeling and attractor landscape analysis to analyze the state transition dynamics of a simplified p53 network for which particular combinations of activation states of the molecules corresponded to specific cellular outcomes. Our results identified five critical interactions in the network that determined the cellular response to DNA damage, and simulations lacking any of these interactions produced states associated with sustained p53 activity, which corresponded to a cell death response. Attractor landscape analysis of the cellular response to DNA damage of the breast cancer cell line MCF7 and the effect of the Mdm2 (murine double minute 2) inhibitor nutlin-3 indicated that nutlin-3 would exhibit limited efficacy in triggering cell death, because the cell death state was not induced to a large extent by simulations with nutlin-3 and instead produced a state consistent with oscillatory p53 dynamics and cell cycle arrest. Attractor landscape analysis also suggested that combining nutlin-3 with inhibition of Wip1 would synergize to stimulate a sustained increase in p53 activity and promote p53-mediated cell death. We validated this synergistic effect in stimulating p53 activity and triggering cell death with single-cell imaging of a fluorescent p53 reporter in MCF7 cells. Thus, attractor landscape analysis of p53 network dynamics and its regulation can identify potential therapeutic strategies for treating cancer.
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Affiliation(s)
- Minsoo Choi
- Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea
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11
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A Systematic Phenotypic Screen of F-box Genes Through a Tissue-specific RNAi-based Approach in Drosophila. J Genet Genomics 2012; 39:397-413. [DOI: 10.1016/j.jgg.2012.05.009] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2012] [Revised: 05/25/2012] [Accepted: 05/30/2012] [Indexed: 02/03/2023]
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12
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Smoum R, Rubinstein A, Dembitsky VM, Srebnik M. Boron containing compounds as protease inhibitors. Chem Rev 2012; 112:4156-220. [PMID: 22519511 DOI: 10.1021/cr608202m] [Citation(s) in RCA: 303] [Impact Index Per Article: 25.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Reem Smoum
- The School of Pharmacy, Institute for Drug Research, The Hebrew University of Jerusalem, Faculty of Medicine, Jerusalem, Israel.
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Ponts N, Saraf A, Chung DWD, Harris A, Prudhomme J, Washburn MP, Florens L, Le Roch KG. Unraveling the ubiquitome of the human malaria parasite. J Biol Chem 2011; 286:40320-30. [PMID: 21930698 PMCID: PMC3220526 DOI: 10.1074/jbc.m111.238790] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2011] [Revised: 09/13/2011] [Indexed: 11/06/2022] Open
Abstract
Malaria is one of the deadliest infectious diseases worldwide. The most severe form is caused by the eukaryotic protozoan parasite Plasmodium falciparum. Recent studies have highlighted the importance of post-translational regulations for the parasite's progression throughout its life cycle, protein ubiquitylation being certainly one of the most abundant. The specificity of its components and the wide range of biological processes in which it is involved make the ubiquitylation pathway a promising source of suitable targets for anti-malarial drug development. Here, we combined immunofluorescent microscopy, biochemical assays, in silico prediction, and mass spectrometry analysis using the multidimensional protein identification technology, or MudPIT, to describe the P. falciparum ubiquitome. We found that ubiquitin conjugates are detected at every morphological stage of the parasite erythrocytic cycle. Furthermore, we detected that more than half of the parasite's proteome represents possible targets for ubiquitylation, especially proteins found to be present at the most replicative stage of the asexual cycle, the trophozoite stage. A large proportion of ubiquitin conjugates were also detected at the schizont stage, consistent with a cell activity slowdown to prepare for merozoite differentiation and invasion. Finally, for the first time in the human malaria parasite, our results strongly indicate the presence of heterologous mixed conjugations, SUMO/UB. This discovery suggests that sumoylated proteins may be regulated by ubiquitylation in P. falciparum. Altogether, our results present the first stepping stone toward a better understanding of ubiquitylation and its role(s) in the biology of the human malaria parasite.
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Affiliation(s)
- Nadia Ponts
- From the Department of Cell Biology and Neuroscience, University of California, Riverside, California 92521 and
| | - Anita Saraf
- the Stowers Institute for Medical Research, Kansas City, Missouri 64110
| | - Duk-Won D. Chung
- From the Department of Cell Biology and Neuroscience, University of California, Riverside, California 92521 and
| | - Alona Harris
- From the Department of Cell Biology and Neuroscience, University of California, Riverside, California 92521 and
| | - Jacques Prudhomme
- From the Department of Cell Biology and Neuroscience, University of California, Riverside, California 92521 and
| | | | - Laurence Florens
- the Stowers Institute for Medical Research, Kansas City, Missouri 64110
| | - Karine G. Le Roch
- From the Department of Cell Biology and Neuroscience, University of California, Riverside, California 92521 and
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Searching for the boundaries: unlimited expansion of ubiquitin and ubiquitin-like signals in multiple cellular functions. Biochem Soc Trans 2010; 38:1-5. [PMID: 20074026 DOI: 10.1042/bst0380001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The ubiquitin-proteasome field has matured, as is evident from the wide diversity of systems and mechanisms in which it participates and that are the subject of investigation, presented in the Ubiquitin-Proteasome System, Dynamics and Targeting meeting held in Barcelona, co-sponsored by the Biochemical Society, the Spanish Ministry of Science, the Spanish Research Council and the Catalan Academy of Sciences. Several of the aspects dealt with in the meeting are discussed in detail in the collection of review papers included in this issue of Biochemical Society Transactions. These papers reflect the importance of ubiquitin and ubiquitin-like modifiers as enormously versatile signalling entities that modulate and direct pathways in specific directions through modification-induced interactions. One conclusion from the meeting is that the field has become so rich and dense that, in order to be useful and informative, future meetings may need to focus on particular aspects of the ubiquitin-proteasome system.
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