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Huo C, Wu D, Li X, Zhang Y, Hu B, Zhang T, Ren J, Wang T, Liu Y. eIf3a mediates malignant biological behaviors in colorectal cancer through the PI3K/AKT signaling pathway. Cancer Biol Ther 2024; 25:2355703. [PMID: 38782896 PMCID: PMC11123456 DOI: 10.1080/15384047.2024.2355703] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Accepted: 05/09/2024] [Indexed: 05/25/2024] Open
Abstract
Colorectal cancer (CRC) is among the most common gastrointestinal malignancies worldwide. eIF3a is highly expressed in a variety of cancer types, yet its role in CRC remains unclear. We introduced ectopic eIF3a expression in CRC cells to investigate its relevance to various malignant behaviors. Further, we silenced eIF3a to explore its effect on tumor growth in a nude mouse tumor xenograft model. Finally, the molecular mechanisms through which eIF3a regulates malignancy in CRC cells were explored through bioinformatics analysis combined with the use of a specific PI3K inhibitor (LY294002). eIF3a was highly expressed in the peripheral blood and cancer tissue of CRC patients. Malignancy and tumor growth were significantly inhibited by silencing eIF3a, while overexpression promoted malignant behaviors, with a positive correlation between PI3K/AKT activation and eIF3a expression. Taken together, eIF3a plays an oncogenic role in CRC by regulating PI3K/AKT signaling and is a potential biomarker for CRC diagnosis and prognostic monitoring.
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Affiliation(s)
- Chao Huo
- Department of Anus and Intestines, Shenzhen Nanshan People’s Hospital, Shenzhen, Guangdong, China
| | - Disheng Wu
- Department of Anus and Intestines, Shenzhen Nanshan People’s Hospital, Shenzhen, Guangdong, China
| | - Xiaodan Li
- Hongshan Community Hospital, People’s Hospital of Longhua District, Shenzhen, Guangdong, China
| | - Yan Zhang
- Guangdong Provincial Key Laboratory of Research and Development of Natural Drugs, School of Pharmacy, Guangdong Medical University, Dongguan, Guangdong, China
| | - Baoguang Hu
- Department of Gastrointestinal Surgery, Binzhou Medical University Hospital, Binzhou, Shandong, China
| | - Taoming Zhang
- Hongshan Community Hospital, People’s Hospital of Longhua District, Shenzhen, Guangdong, China
| | - Jianwei Ren
- Centre for Regenerative Medicine and Health, Hong Kong Institute of Science and Innovation, Chinese Academy of Sciences, Hong Kong, China
- R&D Department, Shenzhen Ritzcon Biological Technology Co., Ltd., Shenzhen, Guangdong, China
| | - Tianbao Wang
- Department of Gastrointestinal Surgery, South China Hospital of Shenzhen University, Shenzhen, Guangdong, China
| | - Yi Liu
- School of Ocean and Tropical Medicine, Guangdong Medical University, Zhanjiang, Guangdong, China
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2
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Baena-Lopez LA, Wang L, Wendler F. Cellular stress management by caspases. Curr Opin Cell Biol 2024; 86:102314. [PMID: 38215516 DOI: 10.1016/j.ceb.2023.102314] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Revised: 12/14/2023] [Accepted: 12/18/2023] [Indexed: 01/14/2024]
Abstract
Cellular stress plays a pivotal role in the onset of numerous human diseases. Consequently, the removal of dysfunctional cells, which undergo excessive stress-induced damage via various cell death pathways, including apoptosis, is essential for maintaining organ integrity and function. The evolutionarily conserved family of cysteine-aspartic-proteases, known as caspases, has been a key player in orchestrating apoptosis. However, recent research has unveiled the capability of these enzymes to govern fundamental cellular processes without triggering cell death. Remarkably, some of these non-lethal functions of caspases may contribute to restoring cellular equilibrium in stressed cells. This manuscript discusses how caspases can function as cellular stress managers and their potential impact on human health and disease. Additionally, it sheds light on the limitations of caspase-based therapies, given our still incomplete understanding of the biology of these enzymes, particularly in non-apoptotic contexts.
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Affiliation(s)
| | - Li Wang
- Sir William Dunn School of Pathology, University of Oxford, Oxford, OX13RE, UK
| | - Franz Wendler
- Sir William Dunn School of Pathology, University of Oxford, Oxford, OX13RE, UK. https://twitter.com/wendlerfranz
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3
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Gaete-Argel A, Velásquez F, Márquez CL, Rojas-Araya B, Bueno-Nieto C, Marín-Rojas J, Cuevas-Zúñiga M, Soto-Rifo R, Valiente-Echeverría F. Tellurite Promotes Stress Granules and Nuclear SG-Like Assembly in Response to Oxidative Stress and DNA Damage. Front Cell Dev Biol 2021; 9:622057. [PMID: 33681200 PMCID: PMC7928414 DOI: 10.3389/fcell.2021.622057] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Accepted: 01/21/2021] [Indexed: 12/13/2022] Open
Abstract
Tellurium oxyanion, tellurite (TeO3–2), is a highly toxic compound for many organisms. Its presence in the environment has increased over the past years due to industrial manufacturing processes and has been associated with adverse effects on human health. Although tellurite induces the phosphorylation of eIF2α, DNA damage and oxidative stress, the molecular mechanisms related to the cellular responses to tellurite-induced stress are poorly understood. In this work, we evaluated the ability of tellurite to induce phosphorylation of eIF2α, stress granules (SGs) assembly and their relationship with DNA damage in U2OS cells. We demonstrate that tellurite promotes the assembly of bona fide cytoplasmic SGs. Unexpectedly, tellurite also induces the assembly of nuclear SGs. Interestingly, we observed that the presence of tellurite-induced nuclear SGs correlates with γH2AX foci. However, although H2O2 also induce DNA damage, no nuclear SGs were observed. Our data show that tellurite promotes the assembly of cytoplasmic and nuclear SGs in response to oxidative stress and DNA damage, revealing a new aspect of cellular stress response mediated by the assembly of nuclear stress granules.
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Affiliation(s)
- Aracelly Gaete-Argel
- Molecular and Cellular Virology Laboratory, Faculty of Medicine, Virology Program, Institute of Biomedical Sciences, Universidad de Chile, Santiago, Chile.,HIV/AIDS Workgroup, Faculty of Medicine, Universidad de Chile, Santiago, Chile
| | - Felipe Velásquez
- Molecular and Cellular Virology Laboratory, Faculty of Medicine, Virology Program, Institute of Biomedical Sciences, Universidad de Chile, Santiago, Chile.,HIV/AIDS Workgroup, Faculty of Medicine, Universidad de Chile, Santiago, Chile
| | - Chantal L Márquez
- Molecular and Cellular Virology Laboratory, Faculty of Medicine, Virology Program, Institute of Biomedical Sciences, Universidad de Chile, Santiago, Chile.,HIV/AIDS Workgroup, Faculty of Medicine, Universidad de Chile, Santiago, Chile
| | - Barbara Rojas-Araya
- HIV/AIDS Workgroup, Faculty of Medicine, Universidad de Chile, Santiago, Chile
| | - Constanza Bueno-Nieto
- Molecular and Cellular Virology Laboratory, Faculty of Medicine, Virology Program, Institute of Biomedical Sciences, Universidad de Chile, Santiago, Chile
| | - Josefina Marín-Rojas
- Molecular and Cellular Virology Laboratory, Faculty of Medicine, Virology Program, Institute of Biomedical Sciences, Universidad de Chile, Santiago, Chile.,HIV/AIDS Workgroup, Faculty of Medicine, Universidad de Chile, Santiago, Chile
| | - Miguel Cuevas-Zúñiga
- Molecular and Cellular Virology Laboratory, Faculty of Medicine, Virology Program, Institute of Biomedical Sciences, Universidad de Chile, Santiago, Chile
| | - Ricardo Soto-Rifo
- Molecular and Cellular Virology Laboratory, Faculty of Medicine, Virology Program, Institute of Biomedical Sciences, Universidad de Chile, Santiago, Chile.,HIV/AIDS Workgroup, Faculty of Medicine, Universidad de Chile, Santiago, Chile
| | - Fernando Valiente-Echeverría
- Molecular and Cellular Virology Laboratory, Faculty of Medicine, Virology Program, Institute of Biomedical Sciences, Universidad de Chile, Santiago, Chile.,HIV/AIDS Workgroup, Faculty of Medicine, Universidad de Chile, Santiago, Chile
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4
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Smith RCL, Kanellos G, Vlahov N, Alexandrou C, Willis AE, Knight JRP, Sansom OJ. Translation initiation in cancer at a glance. J Cell Sci 2021; 134:jcs248476. [PMID: 33441326 DOI: 10.1242/jcs.248476] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Cell division, differentiation and function are largely dependent on accurate proteome composition and regulated gene expression. To control this, protein synthesis is an intricate process governed by upstream signalling pathways. Eukaryotic translation is a multistep process and can be separated into four distinct phases: initiation, elongation, termination and recycling of ribosomal subunits. Translation initiation, the focus of this article, is highly regulated to control the activity and/or function of eukaryotic initiation factors (eIFs) and permit recruitment of mRNAs to the ribosomes. In this Cell Science at a Glance and accompanying poster, we outline the mechanisms by which tumour cells alter the process of translation initiation and discuss how this benefits tumour formation, proliferation and metastasis.
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Affiliation(s)
- Rachael C L Smith
- CRUK Beatson Institute, Garscube Estate, Switchback Road, Glasgow G61 1BD, UK
- Institute of Cancer Sciences, University of Glasgow, G61 1QH, UK
| | - Georgios Kanellos
- CRUK Beatson Institute, Garscube Estate, Switchback Road, Glasgow G61 1BD, UK
| | - Nikola Vlahov
- CRUK Beatson Institute, Garscube Estate, Switchback Road, Glasgow G61 1BD, UK
| | | | - Anne E Willis
- MRC Toxicology Unit, University of Cambridge, Cambridge CB2 1QW, UK
| | - John R P Knight
- CRUK Beatson Institute, Garscube Estate, Switchback Road, Glasgow G61 1BD, UK
| | - Owen J Sansom
- CRUK Beatson Institute, Garscube Estate, Switchback Road, Glasgow G61 1BD, UK
- Institute of Cancer Sciences, University of Glasgow, G61 1QH, UK
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Effects of EIF3B gene downregulation on apoptosis and proliferation of human ovarian cancer SKOV3 and HO-8910 cells. Biomed Pharmacother 2018; 109:831-837. [PMID: 30551537 DOI: 10.1016/j.biopha.2018.10.027] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2018] [Revised: 10/04/2018] [Accepted: 10/04/2018] [Indexed: 02/06/2023] Open
Abstract
In order to investigate the role of EIF3B (eukaryotic translation initiation factor 3B, EIF3B) gene in the proliferation and apoptosis of ovarian cancer cells, a lentiviral vector system and shEIF3B lentiviral vector were constructed to transfect human ovarian cancer cells. SKOV3 and HO-8910 cells were used in this experiment. The cell growth was detected by Celigo cell counting assay, the apoptosis rate was measured by flow cytometry and the cell proliferation ability of lentivirus transfected cells was tested by MTT assay and clone formation assay. Results showed that the specific shRNA had a significant inhibitory effect on the expression of EIF3B gene. Compared with the negative control, the expression of EIF3B mRNA and protein in SKOV3 and HO-8910 cells were significantly inhibited in the knockdown group. Then the proliferation rate of each group was tested, we found that SKOV3 and HO-8910 cells in siRNA lentivirus infected group was significantly decreased. Same result was obtained from the clonogenic assay of which the colony formation of transfected cells was significantly inhibited compared with the control group. Further study showed that the proliferation inhibitory effect was associated with as increased apoptosis rate of SKOV3 and HO-8910 cells in EIF3B knockdown groups. All in all, inhibition of EIF3B gene expression significantly inhibit the proliferation of ovarian cancer cells and increase the apoptosis of ovarian cancer cells. These results provide a new basis for the study of the molecular mechanism of ovarian cancer development and provide new target gene for ovarian cancer treatment.
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Yang C, Liu X, Li C, Li S, Du W, Yang D. Eukaryotic translation initiation factor 3 subunit G (EIF3G) resensitized HCT116/5-Fu to 5-fluorouracil (5-Fu) via inhibition of MRP and MDR1. Onco Targets Ther 2018; 11:5315-5324. [PMID: 30214237 PMCID: PMC6126502 DOI: 10.2147/ott.s170854] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Purpose Colorectal cancer (CRC) has become a predominant cancer and accounts for approximately 10% of cancer-related mortality. Drug resistance still remains a priority mortality factor for patients due to no available therapeutic alternatives. The purpose of the present study was to investigate the underlying molecular mechanisms how eukaryotic translation initiation factor 3 subunit G (EIF3G) resensitized 5-Fu-resistant human CRC cells (HCT116/5-Fu) to 5-fluorouracil (5-Fu). Methods Multiple cellular and molecular biology experiments were performed in the present study, such as CCK-8, western blotting and flow cytometry. Results We found that EIF3G is highly expressed at RNA and protein levels in HCT116/5-Fu cells compared with HCT116 cells using quantitative real-time polymerase chain reaction and Western blot analysis. In addition, silencing EIF3G enhanced 5-Fu-induced apoptosis in HCT116/5-Fu cells. Moreover, EIF3G silencing decreased the activity of the drug-related proteins MDR1 and MRP levels in HCT116/5-Fu cells. Finally, the xenograft tumor model further confirmed that EIF3G resensitized HCT116/5-Fu tumors to 5-Fu. We observed that EIF3G silencing followed by 5-Fu administration had a synergistic interaction effect on HCT116/5-Fu in vitro and in vivo. Conclusion These findings demonstrate that EIF3G is a targetable regulator of chemoresistance in CRC, and inhibiting EIF3G in combination with 5-Fu might be a potential therapeutic strategy for colon cancer.
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Affiliation(s)
| | - Xin Liu
- Department of Gastrointestinal Surgery,
| | | | - Shuangjing Li
- Department of Central Laboratory, Liaocheng People's Hospital, Liaocheng 252000, Shandong, China
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7
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Zheng Q, Liu H, Ye J, Zhang H, Jia Z, Cao J. Nuclear distribution of eIF3g and its interacting nuclear proteins in breast cancer cells. Mol Med Rep 2016; 13:2973-80. [PMID: 26935993 PMCID: PMC4805062 DOI: 10.3892/mmr.2016.4935] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2015] [Accepted: 01/11/2016] [Indexed: 12/11/2022] Open
Abstract
Eukaryotic translation initiation factor 3 subunit g (eIF3g) is a core subunit of the eukaryotic translation initiation factor 3 complex, and is important in the initiation of translation. It is also involved in caspase-mediated apoptosis, and is upregulated in multidrug-resistant cancer cells. In the present study, the nuclear distribution of eIF3g was determined by performing co-immunoprecipitation of proteins that potentially interact with eIF3g in the nucleus. Mass spectrometry characterization showed that three proteins, heterogeneous nuclear ribonucleoprotein U/scaffold attachment factor A, HSZFP36/zinc finger protein 823 and β-actin, were among the candidate eIF3g-interacting proteins in the nucleus. The protein-protein interaction was further confirmed by cross-linking and a glutathione S-transferase pull-down assay, followed by western blotting. The co-localization of these proteins was determined by confocal microscopy. These findings provide novel insight into the possible functions of eIF3g in the nucleus and serves as an important first step for further investigation of the roles of eIF3g in cancer development.
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Affiliation(s)
- Qiaoli Zheng
- Clinical Research Center, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang 310009, P.R. China
| | - Hao Liu
- Institute of Occupational Diseases, Zhejiang Academy of Medical Sciences, Hangzhou, Zhejiang 310007, P.R. China
| | - Jingjia Ye
- Clinical Research Center, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang 310009, P.R. China
| | - Hui Zhang
- Department of Clinical Laboratory, Hangzhou First People's Hospital, Hangzhou, Zhejiang 310006, P.R. China
| | - Zhenyu Jia
- Institute of Occupational Diseases, Zhejiang Academy of Medical Sciences, Hangzhou, Zhejiang 310007, P.R. China
| | - Jiang Cao
- Clinical Research Center, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang 310009, P.R. China
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Holm A, Lin L, Faraco J, Mostafavi S, Battle A, Zhu X, Levinson DF, Han F, Gammeltoft S, Jennum P, Mignot E, Kornum BR. EIF3G is associated with narcolepsy across ethnicities. Eur J Hum Genet 2015; 23:1573-80. [PMID: 25669430 DOI: 10.1038/ejhg.2015.4] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2014] [Revised: 10/28/2014] [Accepted: 12/09/2014] [Indexed: 01/06/2023] Open
Abstract
Type 1 narcolepsy, an autoimmune disease affecting hypocretin (orexin) neurons, is strongly associated with HLA-DQB1*06:02. Among polymorphisms associated with the disease is single-nucleotide polymorphism rs2305795 (c.*638G>A) located within the P2RY11 gene. P2RY11 is in a region of synteny conserved in mammals and zebrafish containing PPAN, EIF3G and DNMT1 (DNA methyltransferase 1). As mutations in DNMT1 cause a rare dominant form of narcolepsy in association with deafness, cerebellar ataxia and dementia, we questioned whether the association with P2RY11 in sporadic narcolepsy could be secondary to linkage disequilibrium with DNMT1. Based on genome-wide association data from two cohorts of European and Chinese ancestry, we found that the narcolepsy association signal drops sharply between P2RY11/EIF3G and DNMT1, suggesting that the association with narcolepsy does not extend into the DNMT1 gene region. Interestingly, using transethnic mapping, we identified a novel single-nucleotide polymorphism rs3826784 (c.596-260A>G) in the EIF3G gene also associated with narcolepsy. The disease-associated allele increases EIF3G mRNA expression. EIF3G is located in the narcolepsy risk locus and EIF3G expression correlates with PPAN and P2RY11 expression. This suggests shared regulatory mechanisms that might be affected by the polymorphism and are of relevance to narcolepsy.
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Affiliation(s)
- Anja Holm
- Molecular Sleep Laboratory, Department of Diagnostics, Glostrup University Hospital, Glostrup, Denmark.,Danish Center for Sleep Medicine, Department of Neurophysiology, Glostrup Hospital, University of Copenhagen, Glostrup, Denmark
| | - Ling Lin
- Center for Sleep Sciences in Medicine and Department of Psychiatry, Stanford University School of Medicine, Palo Alto, CA, USA
| | - Juliette Faraco
- Center for Sleep Sciences in Medicine and Department of Psychiatry, Stanford University School of Medicine, Palo Alto, CA, USA
| | - Sara Mostafavi
- Department of Computer Science, Stanford University, Palo Alto, CA, USA
| | - Alexis Battle
- Department of Computer Science, Stanford University, Palo Alto, CA, USA
| | - Xiaowei Zhu
- Department of Psychiatry and Behavioral Sciences, Stanford University, Palo Alto, CA, USA
| | - Douglas F Levinson
- Department of Psychiatry and Behavioral Sciences, Stanford University, Palo Alto, CA, USA
| | - Fang Han
- Department of Pulmonary, Critical Care Medicine, Peking University People's Hospital, Beijing, China
| | - Steen Gammeltoft
- Molecular Sleep Laboratory, Department of Diagnostics, Glostrup University Hospital, Glostrup, Denmark
| | - Poul Jennum
- Danish Center for Sleep Medicine, Department of Neurophysiology, Glostrup Hospital, University of Copenhagen, Glostrup, Denmark
| | - Emmanuel Mignot
- Center for Sleep Sciences in Medicine and Department of Psychiatry, Stanford University School of Medicine, Palo Alto, CA, USA
| | - Birgitte R Kornum
- Molecular Sleep Laboratory, Department of Diagnostics, Glostrup University Hospital, Glostrup, Denmark
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Gao L, Tuo D, Shen W, Yan P, Li X, Zhou P. NIa-Pro of Papaya ringspot virus interacts with Carica papaya eukaryotic translation initiation factor 3 subunit G (CpeIF3G). Virus Genes 2014; 50:97-103. [PMID: 25416301 DOI: 10.1007/s11262-014-1145-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2014] [Accepted: 11/12/2014] [Indexed: 11/29/2022]
Abstract
The interaction of papaya eukaryotic translation initiation factor 3 subunit G (CpeIF3G) with Papaya ringspot virus (PRSV) NIa-Pro was validated using a bimolecular fluorescence complementation assay in papaya protoplasts based on the previous yeast two-hybrid assay results. The C-terminal (residues 133-239) fragment of PRSV NIa-Pro and the central domain (residues 59-167) of CpeIF3G were required for effective interaction between NIa-Pro and CpeIF3G as shown by a Sos recruitment yeast two-hybrid system with several deletion mutants of NIa-Pro and CpeIF3G. The central domain of CpeIF3G, which contains a C2HC-type zinc finger motif, is required to bind to other eIFs of the translational machinery. In addition, quantitative real-time reverse transcription PCR assay confirmed that PRSV infection leads to a 2- to 4.5-fold up-regulation of CpeIF3G mRNA in papaya. Plant eIF3G is involved in various stress response by enhancing the translation of resistance-related proteins. It is proposed that the NIa-Pro-CpeIF3G interaction may impair translation preinitiation complex assembly of defense proteins and interfere with host defense.
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Affiliation(s)
- Le Gao
- Key Laboratory of Biology and Genetic Resources of Tropical Crops, Ministry of Agriculture, Institute of Tropical Bioscience and Biotechnology & Analysis and Testing Center, Chinese Academy of Tropical Agricultural Sciences, Haikou, 571101, People's Republic of China
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