The J-Subunit of Human Translation Initiation Factor Eif3 Is Required for the Stable Binding of Eif3 and Its Subcomplexes to 40 S Ribosomal Subunits in Vitro*
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Structural Characterization of the Human Eukaryotic Initiation Factor 3 Protein Complex by Mass Spectrometry*□S
Supplemental Material can be found at: http://www.mcponline.org/cgi/content/full/M600399-MCP200 /DC1 Research Structural Characterization of the Human Eukaryotic Initiation Factor 3 Protein Complex by Mass Spectrometry*□S Eugen Damoc‡, Christopher S. Fraser§, Min Zhou¶, Hortense Videler¶, Greg L. Mayeurʈ, John W. B. Hersheyʈ, Jennifer A. Doudna§, Carol V. Robinson¶**, and Julie A. Leary‡ ‡‡ Protein synthesis in mammalian cells requires initiation The initiation phase of eukaryotic protein synthesis involves factor eIF3, an ϳ800-kDa protein complex that plays a formation of an 80 S ribosomal complex containing the initi- Downloaded from central role in binding of initiator methionyl-tRNA and ator methionyl-tRNAi bound to the initiation codon in the mRNA to the 40 S ribosomal subunit to form the 48 S mRNA. This is a multistep process promoted by proteins initiation complex. The eIF3 complex also prevents pre- called eukaryotic initiation factors (eIFs).1 Currently at least 12 mature association of the 40 and 60 S ribosomal subunits eIFs, composed of at least 29 distinct subunits, have been and interacts with other initiation factors involved in start identified (1). Mammalian eIF3, the largest initiation factor, is a codon selection. The molecular mechanisms by which multisubunit complex with an apparent molecular mass of www.mcponline.org eIF3 exerts these functions are poorly understood. Since ϳ800 kDa. This protein complex plays an essential role in its initial characterization in the 1970s, the exact size, translation by binding directly to the 40 S ribosomal subunit composition, and post-translational modifications of and promoting formation of the 43 S preinitiation complex ⅐ ⅐ mammalian eIF3 have not been rigorously determined. -
A Computational Approach for Defining a Signature of Β-Cell Golgi Stress in Diabetes Mellitus
Page 1 of 781 Diabetes A Computational Approach for Defining a Signature of β-Cell Golgi Stress in Diabetes Mellitus Robert N. Bone1,6,7, Olufunmilola Oyebamiji2, Sayali Talware2, Sharmila Selvaraj2, Preethi Krishnan3,6, Farooq Syed1,6,7, Huanmei Wu2, Carmella Evans-Molina 1,3,4,5,6,7,8* Departments of 1Pediatrics, 3Medicine, 4Anatomy, Cell Biology & Physiology, 5Biochemistry & Molecular Biology, the 6Center for Diabetes & Metabolic Diseases, and the 7Herman B. Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN 46202; 2Department of BioHealth Informatics, Indiana University-Purdue University Indianapolis, Indianapolis, IN, 46202; 8Roudebush VA Medical Center, Indianapolis, IN 46202. *Corresponding Author(s): Carmella Evans-Molina, MD, PhD ([email protected]) Indiana University School of Medicine, 635 Barnhill Drive, MS 2031A, Indianapolis, IN 46202, Telephone: (317) 274-4145, Fax (317) 274-4107 Running Title: Golgi Stress Response in Diabetes Word Count: 4358 Number of Figures: 6 Keywords: Golgi apparatus stress, Islets, β cell, Type 1 diabetes, Type 2 diabetes 1 Diabetes Publish Ahead of Print, published online August 20, 2020 Diabetes Page 2 of 781 ABSTRACT The Golgi apparatus (GA) is an important site of insulin processing and granule maturation, but whether GA organelle dysfunction and GA stress are present in the diabetic β-cell has not been tested. We utilized an informatics-based approach to develop a transcriptional signature of β-cell GA stress using existing RNA sequencing and microarray datasets generated using human islets from donors with diabetes and islets where type 1(T1D) and type 2 diabetes (T2D) had been modeled ex vivo. To narrow our results to GA-specific genes, we applied a filter set of 1,030 genes accepted as GA associated. -
A Chemical-Genetic Screen for Identifying Substrates of the Er Kinase Perk
University of Pennsylvania ScholarlyCommons Publicly Accessible Penn Dissertations 2014 A Chemical-Genetic Screen for Identifying Substrates of the Er Kinase Perk Nancy L. Maas University of Pennsylvania, [email protected] Follow this and additional works at: https://repository.upenn.edu/edissertations Part of the Biology Commons, Cell Biology Commons, and the Molecular Biology Commons Recommended Citation Maas, Nancy L., "A Chemical-Genetic Screen for Identifying Substrates of the Er Kinase Perk" (2014). Publicly Accessible Penn Dissertations. 1354. https://repository.upenn.edu/edissertations/1354 This paper is posted at ScholarlyCommons. https://repository.upenn.edu/edissertations/1354 For more information, please contact [email protected]. A Chemical-Genetic Screen for Identifying Substrates of the Er Kinase Perk Abstract Cells constantly encounter changing environments that challenge the ability to adapt and survive. Signal transduction networks enable cells to appropriately sense and respond to these changes, and are often mediated through the activity of protein kinases. Protein kinases are a class of enzyme responsible for regulating a broad spectrum of cellular functions by transferring phosphate groups from ATP to substrate proteins, thereby altering substrate activity and function. PERK is a resident kinase of the endoplasmic reticulum, and is responsible for sensing perturbations in the protein folding capacity of the ER. When the influx of unfolded, nascent proteins exceeds the folding capacity of the ER, PERK initiates a cascade of signaling events that enable cell adaptation and ER stress resolution. These signaling pathways are not only essential for the survival of normal cells undergoing ER stress, but are also co-opted by tumor cells in order to survive the oxygen and nutrient-restricted conditions of the tumor microenvironment. -
4-6 Weeks Old Female C57BL/6 Mice Obtained from Jackson Labs Were Used for Cell Isolation
Methods Mice: 4-6 weeks old female C57BL/6 mice obtained from Jackson labs were used for cell isolation. Female Foxp3-IRES-GFP reporter mice (1), backcrossed to B6/C57 background for 10 generations, were used for the isolation of naïve CD4 and naïve CD8 cells for the RNAseq experiments. The mice were housed in pathogen-free animal facility in the La Jolla Institute for Allergy and Immunology and were used according to protocols approved by the Institutional Animal Care and use Committee. Preparation of cells: Subsets of thymocytes were isolated by cell sorting as previously described (2), after cell surface staining using CD4 (GK1.5), CD8 (53-6.7), CD3ε (145- 2C11), CD24 (M1/69) (all from Biolegend). DP cells: CD4+CD8 int/hi; CD4 SP cells: CD4CD3 hi, CD24 int/lo; CD8 SP cells: CD8 int/hi CD4 CD3 hi, CD24 int/lo (Fig S2). Peripheral subsets were isolated after pooling spleen and lymph nodes. T cells were enriched by negative isolation using Dynabeads (Dynabeads untouched mouse T cells, 11413D, Invitrogen). After surface staining for CD4 (GK1.5), CD8 (53-6.7), CD62L (MEL-14), CD25 (PC61) and CD44 (IM7), naïve CD4+CD62L hiCD25-CD44lo and naïve CD8+CD62L hiCD25-CD44lo were obtained by sorting (BD FACS Aria). Additionally, for the RNAseq experiments, CD4 and CD8 naïve cells were isolated by sorting T cells from the Foxp3- IRES-GFP mice: CD4+CD62LhiCD25–CD44lo GFP(FOXP3)– and CD8+CD62LhiCD25– CD44lo GFP(FOXP3)– (antibodies were from Biolegend). In some cases, naïve CD4 cells were cultured in vitro under Th1 or Th2 polarizing conditions (3, 4). -
Genes with 5' Terminal Oligopyrimidine Tracts Preferentially Escape Global Suppression of Translation by the SARS-Cov-2 NSP1 Protein
Downloaded from rnajournal.cshlp.org on September 28, 2021 - Published by Cold Spring Harbor Laboratory Press Genes with 5′ terminal oligopyrimidine tracts preferentially escape global suppression of translation by the SARS-CoV-2 Nsp1 protein Shilpa Raoa, Ian Hoskinsa, Tori Tonna, P. Daniela Garciaa, Hakan Ozadama, Elif Sarinay Cenika, Can Cenika,1 a Department of Molecular Biosciences, University of Texas at Austin, Austin, TX 78712, USA 1Corresponding author: [email protected] Key words: SARS-CoV-2, Nsp1, MeTAFlow, translation, ribosome profiling, RNA-Seq, 5′ TOP, Ribo-Seq, gene expression 1 Downloaded from rnajournal.cshlp.org on September 28, 2021 - Published by Cold Spring Harbor Laboratory Press Abstract Viruses rely on the host translation machinery to synthesize their own proteins. Consequently, they have evolved varied mechanisms to co-opt host translation for their survival. SARS-CoV-2 relies on a non-structural protein, Nsp1, for shutting down host translation. However, it is currently unknown how viral proteins and host factors critical for viral replication can escape a global shutdown of host translation. Here, using a novel FACS-based assay called MeTAFlow, we report a dose-dependent reduction in both nascent protein synthesis and mRNA abundance in cells expressing Nsp1. We perform RNA-Seq and matched ribosome profiling experiments to identify gene-specific changes both at the mRNA expression and translation level. We discover that a functionally-coherent subset of human genes are preferentially translated in the context of Nsp1 expression. These genes include the translation machinery components, RNA binding proteins, and others important for viral pathogenicity. Importantly, we uncovered a remarkable enrichment of 5′ terminal oligo-pyrimidine (TOP) tracts among preferentially translated genes. -
The Yeast Eif3 Subunits TIF32/A, NIP1/C, and Eif5 Make Critical Connections with the 40Sribosome in Vivo
Downloaded from genesdev.cshlp.org on October 6, 2021 - Published by Cold Spring Harbor Laboratory Press The yeast eIF3 subunits TIF32/a, NIP1/c, and eIF5 make critical connections with the 40Sribosome in vivo Leoš Valášek, Amy A. Mathew, Byung-Sik Shin, Klaus H. Nielsen, Béla Szamecz, and Alan G. Hinnebusch1 Laboratory of Gene Regulation and Development, National Institute of Child Health and Human Development, Bethesda, Maryland 20892, USA Initiation factor 3 (eIF3) forms a multifactor complex (MFC) with eIF1, eIF2, and eIF5 that stimulates Met Met-tRNAi binding to 40Sribosomes and promotes scanning or AUG recognition. We have previously characterized MFC subcomplexes produced in vivo from affinity-tagged eIF3 subunits lacking discrete binding domains for other MFC components. Here we asked whether these subcomplexes can bind to 40Sribosomes in vivo. We found that the N- and C-terminal domains of NIP1/eIF3c, the N- and C-terminal domains of TIF32/eIF3a, and eIF5 have critical functions in 40Sbinding, with eIF5 an d the TIF32-CTD performing redundant functions. The TIF32-CTD interacted in vitro with helices 16–18 of domain I in 18SrRNA, and the TIF32-NTD and NIP1 interacted with 40Sprotein RPS0A.These results sugge st that eIF3 binds to the solvent side of the 40Ssubunit in a way that provides access to the interface side fo r the two eIF3 segments Met (NIP1-NTD and TIF32-CTD) that interact with eIF1, eIF5, and the eIF2/GTP/Met-tRNAi ternary complex. [Keywords: Eukaryotic translation initiation factor (eIF); multifactor complex (MFC); translational control; protein synthesis; 40S ribosome binding; TIF32/NIP1] Supplemental material is available at http://www.genesdev.org. -
Eukaryotic Translation Initiation Factor 3 Plays Distinct Roles at The
RESEARCH ARTICLE Eukaryotic translation initiation factor 3 plays distinct roles at the mRNA entry and exit channels of the ribosomal preinitiation complex Colin Echeverrı´aAitken1, Petra Beznoskova´ 2, Vladislava Vlcˇkova2, Wen-Ling Chiu3†, Fujun Zhou1, Leosˇ Shivaya Vala´ sˇek2*, Alan G Hinnebusch3*, Jon R Lorsch1* 1Laboratory on the Mechanism and Regulation of Protein Synthesis, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, United States; 2Laboratory of Regulation of Gene Expression, Institute of Microbiology ASCR, Prague, Czech Republic; 3Laboratory of Gene Regulation and Development, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, United States Abstract Eukaryotic translation initiation factor 3 (eIF3) is a central player in recruitment of the pre-initiation complex (PIC) to mRNA. We probed the effects on mRNA recruitment of a library of S. cerevisiae eIF3 functional variants spanning its 5 essential subunits using an in vitro-reconstituted *For correspondence: valasekl@ system. Mutations throughout eIF3 disrupt its interaction with the PIC and diminish its ability to biomed.cas.cz (LSV); [email protected] (AGH); jon. accelerate recruitment to a native yeast mRNA. Alterations to the eIF3a CTD and eIF3b/i/g . [email protected] (JRL) significantly slow mRNA recruitment, and mutations within eIF3b/i/g destabilize eIF2 GTP Met- tRNAi binding to the PIC. Using model mRNAs lacking contacts with the 40S entry or exit channels, Present address: we uncovered a critical role for eIF3 requiring the eIF3a NTD, in stabilizing mRNA interactions at †PharmaEssentia Corp., Taipei, the exit channel, and an ancillary role at the entry channel requiring residues of the eIF3a CTD. -
Characterization of the Small RNA Transcriptomes of Cell Protrusions and Cell Bodies of Highly Metastatic Hepatocellular Carcinoma Cells Via RNA Sequencing
ONCOLOGY LETTERS 22: 568, 2021 Characterization of the small RNA transcriptomes of cell protrusions and cell bodies of highly metastatic hepatocellular carcinoma cells via RNA sequencing WENPIN CAI1*, JINGZHANG JI2*, BITING WU2*, KAIXUAN HAO2, PING REN2, YU JIN2, LIHONG YANG2, QINGCHAO TONG2 and ZHIFA SHEN2 1Department of Laboratory Medicine, Wen Zhou Traditional Chinese Medicine Hospital; 2Zhejiang Provincial Key Laboratory of Medical Genetics, Key Laboratory of Laboratory Medicine, Ministry of Education, School of Laboratory Medicine and Life Sciences, Wenzhou Medical University, Wenzhou, Zhejiang 325035, P.R. China Received July 11, 2020; Accepted February 23, 2021 DOI: 10.3892/ol.2021.12829 Abstract. Increasing evidence suggest that hepatocellular differentially expressed miRNAs and circRNAs. The interac‑ carcinoma (HCC) HCCLM3 cells initially develop pseudo‑ tion maps between miRNAs and circRNAs were constructed, podia when they metastasize, and microRNAs (miRNAs/miRs) and signaling pathway maps were analyzed to determine the and circular RNAs (circRNAs) have been demonstrated to molecular mechanism and regulation of the differentially serve important roles in the development, progression and expressed miRNAs and circRNAs. Taken together, the results metastasis of cancer. The present study aimed to isolate the of the present study suggest that the Boyden chamber assay cell bodies (CBs) and cell protrusions (CPs) from HCCLM3 can be used to effectively isolate the somatic CBs and CPs of cells, and screen the miRNAs and circRNAs associated with HCC, which can be used to screen the miRNAs and circRNAs HCC infiltration and metastasis in CBs and CPs. The Boyden associated with invasion and metastasis of HCC. chamber assay has been confirmed to effectively isolate the CBs and CPs from HCCLM3 cells via observation of microtu‑ Introduction bule immunofluorescence, DAPI staining and nuclear protein H3 western blotting. -
GPRC5A Suppresses Protein Synthesis at the Endoplasmic Reticulum to Prevent Radiation-Induced Lung Tumorigenesis
ARTICLE Received 8 Mar 2016 | Accepted 28 Apr 2016 | Published 8 Jun 2016 DOI: 10.1038/ncomms11795 OPEN GPRC5A suppresses protein synthesis at the endoplasmic reticulum to prevent radiation-induced lung tumorigenesis Jian Wang1, Alton B. Farris2, Kaiming Xu1, Ping Wang1, Xiangming Zhang1, Duc M. Duong3, Hong Yi4, Hui-Kuo Shu1, Shi-Yong Sun5 & Ya Wang1 GPRC5A functions as a lung tumour suppressor to prevent spontaneous and environmentally induced lung carcinogenesis; however, the underlying mechanism remains unclear. Here we reveal that GPRC5A at the endoplasmic reticulum (ER) membrane suppresses synthesis of the secreted or membrane-bound proteins including a number of oncogenes, the most important one being Egfr. The ER-located GPRC5A disturbs the assembly of the eIF4F-mediated translation initiation complex on the mRNA cap through directly binding to the eIF4F complex with its two middle extracellular loops. Particularly, suppression of EGFR by GPRC5A contributes significantly to preventing ionizing radiation (IR)-induced lung tumorigenesis. Thus, GPRC5A deletion enhances IR-promoted EGFR expression through an increased translation rate, thereby significantly increasing lung tumour incidence in Gprc5a À / À mice. Our findings indicate that under-expressed GPRC5A during lung tumor- igenesis enhances any transcriptional stimulation through an active translational status, which can be used to control oncogene expression and potentially the resulting related disease. 1 Department of Radiation Oncology, Emory University School of Medicine and the Winship Cancer Institute, Emory University, Atlanta, Georgia 30322, USA. 2 Department of Pathology, Emory University School of Medicine and the Winship Cancer Institute, Emory University, Atlanta, Georgia 30322, USA. 3 Emory Integrated Proteomics Core and Biochemistry Department, Atlanta, Georgia 30322, USA. -
Systematically Profiling the Expression of Eif3 Subunits in Glioma Reveals
Chai et al. Cancer Cell Int (2019) 19:155 https://doi.org/10.1186/s12935-019-0867-1 Cancer Cell International PRIMARY RESEARCH Open Access Systematically profling the expression of eIF3 subunits in glioma reveals the expression of eIF3i has prognostic value in IDH-mutant lower grade glioma Rui‑Chao Chai1,4,6†, Ning Wang2†, Yu‑Zhou Chang3, Ke‑Nan Zhang1,6, Jing‑Jun Li1,6, Jun‑Jie Niu5, Fan Wu1,6*, Yu‑Qing Liu1,6* and Yong‑Zhi Wang1,3,4,6* Abstract Background: Abnormal expression of the eukaryotic initiation factor 3 (eIF3) subunits plays critical roles in tumo‑ rigenesis and progression, and also has potential prognostic value in cancers. However, the expression and clinical implications of eIF3 subunits in glioma remain unknown. Methods: Expression data of eIF3 for patients with gliomas were obtained from the Chinese Glioma Genome Atlas (CGGA) (n 272) and The Cancer Genome Atlas (TCGA) (n 595). Cox regression, the receiver operating characteristic (ROC) curves= and Kaplan–Meier analysis were used to study= the prognostic value. Gene oncology (GO) and gene set enrichment analysis (GSEA) were utilized for functional prediction. Results: In both the CGGA and TCGA datasets, the expression levels of eIF3d, eIF3e, eIF3f, eIF3h and eIF3l highly were associated with the IDH mutant status of gliomas. The expression of eIF3b, eIF3i, eIF3k and eIF3m was increased with the tumor grade, and was associated with poorer overall survival [All Hazard ratio (HR) > 1 and P < 0.05]. By contrast, the expression of eIF3a and eIF3l was decreased in higher grade gliomas and was associated with better overall sur‑ vival (Both HR < 1 and P < 0.05). -
Translation Initiation Factor Eif3h Targets Specific Transcripts To
Translation initiation factor eIF3h targets specific transcripts to polysomes during embryogenesis Avik Choudhuria,b, Umadas Maitraa,1, and Todd Evansb,1 aDepartment of Developmental and Molecular Biology, Albert Einstein College of Medicine of Yeshiva University, Bronx, NY 10461; and bDepartment of Surgery, Weill Cornell Medical College, New York, NY 10065 Edited by Igor B. Dawid, The Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD, and approved April 30, 2013 (received for review February 14, 2013) Eukaryotic translation initiation factor 3 (eIF3) plays a central role eukaryotes. These—eIF3d, eIF3e, eIF3f, eIF3h, eIF3j, eIF3k, in translation initiation and consists of five core (conserved) sub- eIF3l, and eIF3m—were designated “non-core” subunits (4). units present in both budding yeast and higher eukaryotes. Higher In contrast to the budding yeast, the genome of the fission eukaryotic eIF3 contains additional (noncore or nonconserved) yeast Schizosaccharomyces pombe contains structural homologs subunits of poorly defined function, including sub-unit h (eIF3h), of at least five noncore (nonconserved) eIF3 subunits—eIF3d, which in zebrafish is encoded by two distinct genes (eif3ha and eIF3e, eIF3f, eIF3h, and eIF3m. The gene encoding eIF3f is eif3hb). Previously we showed that eif3ha encodes the predominant essential for growth, whereas eIF3d, eIF3e, and eIF3h are dis- isoform during zebrafish embryogenesis and that depletion of this pensable for growth and viability (5–11). However, deleted factor causes defects in the development of the brain and eyes. To strains show specific phenotypes including defects in meiosis/ investigate the molecular mechanism governing this regulation, we sporulation (6, 9, 11). -
1 1 2 Pharmacological Dimerization and Activation of the Exchange
1 2 3 Pharmacological dimerization and activation of the exchange factor eIF2B antagonizes the 4 integrated stress response 5 6 7 *Carmela Sidrauski1,2, *Jordan C. Tsai1,2, Martin Kampmann2,3, Brian R. Hearn4, Punitha 8 Vedantham4, Priyadarshini Jaishankar4 , Masaaki Sokabe5, Aaron S. Mendez1,2, Billy W. 9 Newton6, Edward L. Tang6.7, Erik Verschueren6, Jeffrey R. Johnson6,7, Nevan J. Krogan6,7,, 10 Christopher S. Fraser5, Jonathan S. Weissman2,3, Adam R. Renslo4, and Peter Walter 1,2 11 12 1Department of Biochemistry and Biophysics, University of California, San Francisco, United 13 States 14 2Howard Hughes Medical Institute, University of California, San Francisco, United States 15 3Department of Cellular and Molecular Pharmacology, University of California, San Francisco, 16 United States 17 4Department of Pharmaceutical Chemistry and the Small Molecule Discovery Center, University 18 of California at San Francisco, United States 19 5Department of Molecular and Cellular Biology, College of Biological Sciences, University of 20 California, Davis, United States 21 6QB3, California Institute for Quantitative Biosciences, University of California, San Francisco, 22 United States 23 7Gladstone Institutes, San Francisco, United States 24 25 * Both authors contributed equally to this work 26 27 28 Abstract 29 30 The general translation initiation factor eIF2 is a major translational control point. Multiple 31 signaling pathways in the integrated stress response phosphorylate eIF2 serine-51, inhibiting 32 nucleotide exchange by eIF2B. ISRIB, a potent drug-like small molecule, renders cells 33 insensitive to eIF2α phosphorylation and enhances cognitive function in rodents by blocking 34 long-term depression. ISRIB was identified in a phenotypic cell-based screen, and its mechanism 35 of action remained unknown.