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Huang Z, Xiao F, Wang Q, Zhang X, Shen Y, Deng Y, Shi P. BSC2 modulates AmB resistance via the maintenance of intracellular sodium/potassium ion homeostasis in Saccharomyces cerevisiae. Res Microbiol 2024:104245. [PMID: 39245192 DOI: 10.1016/j.resmic.2024.104245] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2024] [Revised: 06/13/2024] [Accepted: 09/03/2024] [Indexed: 09/10/2024]
Abstract
Previous studies on BSC2 have shown that it enhances yeast cell resistance to AmB via antioxidation and induces multidrug resistance by contributing to biofilm formation. Herein, we found that BSC2 overexpression could reverse the sensitivity of pmp3Δ to AmB and help the tested strains restore the intracellular sodium/potassium balance under exposure to AmB. Meanwhile, overexpression of the chitin gene CHS2 could simulate BSC2 to reverse the sensitivity of pmp3Δ and nha1Δ to high salt or AmB. However, BSC2 overexpression in flo11Δ failed to induce AmB resistance, form biofilms, and affect cell wall biogenesis, while CHS2 overexpression compensated the resistance of flo11Δ to AmB. Additionally, BSC2 levels were positively correlated with maintaining cell membrane integrity under exposure to AmB, CAS, or a combination of both. BSC2 overexpression in nha1Δ exhibited a similar function of CHS2, which can compensate for the sensitivity of the mutant to high salt. Altogether, the results demonstrate for the first time that BSC2 may promote ion equilibrium by strengthening cell walls and inhibiting membrane damage in a FLO path-dependent manner, thus enhancing the resistance of yeast cells to AmB. This study also reveals the possible mechanism of antifungal drugs CAS and AmB combined to inhibit fungi.
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Affiliation(s)
- Zhiwei Huang
- College of Biological Science and Medical Engineering, Donghua University, 2999 Renmin Road, Shanghai, 201620, China.
| | - Fulong Xiao
- College of Biological Science and Medical Engineering, Donghua University, 2999 Renmin Road, Shanghai, 201620, China
| | - Qiao Wang
- College of Biological Science and Medical Engineering, Donghua University, 2999 Renmin Road, Shanghai, 201620, China
| | - Xiaojuan Zhang
- College of Biological Science and Medical Engineering, Donghua University, 2999 Renmin Road, Shanghai, 201620, China
| | - Yuhu Shen
- Key Laboratory of Adaptation and Evolution of Plateau Biota, Qinghai Provincial Key Laboratory of Crop Molecular Breeding, Northwest Institute of Plateau Biology, Innovation Academy for Seed Design, Chinese Academy of Sciences, Xining, 810008, China; Laboratory for Research and Utilization of Qinghai Tibet Plateau Germplasm Resources, Academy of Agriculture and Forestry Sciences of Qinghai University (Qinghai Academy of Agriculture and Forestry Sciences), Xining, 810016, China
| | - Yunxia Deng
- College of Biological Science and Medical Engineering, Donghua University, 2999 Renmin Road, Shanghai, 201620, China
| | - Ping Shi
- Laboratory for Research and Utilization of Qinghai Tibet Plateau Germplasm Resources, Academy of Agriculture and Forestry Sciences of Qinghai University (Qinghai Academy of Agriculture and Forestry Sciences), Xining, 810016, China; State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China
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2
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Jiang H, Milanov M, Jüngert G, Angebauer L, Flender C, Smudde E, Gather F, Vogel T, Jessen HJ, Koch HG. Control of a chemical chaperone by a universally conserved ATPase. iScience 2024; 27:110215. [PMID: 38993675 PMCID: PMC11237923 DOI: 10.1016/j.isci.2024.110215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2023] [Revised: 05/16/2024] [Accepted: 06/05/2024] [Indexed: 07/13/2024] Open
Abstract
The universally conserved YchF/Ola1 ATPases regulate stress response pathways in prokaryotes and eukaryotes. Deletion of YchF/Ola1 leads to increased resistance against environmental stressors, such as reactive oxygen species, while their upregulation is associated with tumorigenesis in humans. The current study shows that in E. coli, the absence of YchF stimulates the synthesis of the alternative sigma factor RpoS by a transcription-independent mechanism. Elevated levels of RpoS then enhance the transcription of major stress-responsive genes. In addition, the deletion of ychF increases the levels of polyphosphate kinase, which in turn boosts the production of the evolutionary conserved and ancient chemical chaperone polyphosphate. This potentially provides a unifying concept for the increased stress resistance in bacteria and eukaryotes upon YchF/Ola1 deletion. Intriguingly, the simultaneous deletion of ychF and the polyphosphate-degrading enzyme exopolyphosphatase causes synthetic lethality in E. coli, demonstrating that polyphosphate production needs to be fine-tuned to prevent toxicity.
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Affiliation(s)
- Hong Jiang
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, Albert-Ludwigs-University Freiburg, 79104 Freiburg, Germany
- Faculty of Biology, Albert-Ludwigs-University Freiburg, 79104 Freiburg, Germany
- Spemann Graduate School of Biology and Medicine, Albert-Ludwigs University Freiburg, 79104 Freiburg, Germany
| | - Martin Milanov
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, Albert-Ludwigs-University Freiburg, 79104 Freiburg, Germany
- Faculty of Biology, Albert-Ludwigs-University Freiburg, 79104 Freiburg, Germany
- Spemann Graduate School of Biology and Medicine, Albert-Ludwigs University Freiburg, 79104 Freiburg, Germany
| | - Gabriela Jüngert
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, Albert-Ludwigs-University Freiburg, 79104 Freiburg, Germany
| | - Larissa Angebauer
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, Albert-Ludwigs-University Freiburg, 79104 Freiburg, Germany
- Faculty of Biology, Albert-Ludwigs-University Freiburg, 79104 Freiburg, Germany
| | - Clara Flender
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, Albert-Ludwigs-University Freiburg, 79104 Freiburg, Germany
| | - Eva Smudde
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, Albert-Ludwigs-University Freiburg, 79104 Freiburg, Germany
| | - Fabian Gather
- Institute for Anatomy and Cell Biology, Department of Molecular Embryology, Faculty of Medicine, Albert-Ludwigs-University Freiburg, 79104 Freiburg, Germany
| | - Tanja Vogel
- Institute for Anatomy and Cell Biology, Department of Molecular Embryology, Faculty of Medicine, Albert-Ludwigs-University Freiburg, 79104 Freiburg, Germany
| | - Henning J. Jessen
- Institute for Organic Chemistry, Faculty of Chemistry and Pharmacy, University Freiburg 79104 Freiburg, Germany
| | - Hans-Georg Koch
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, Albert-Ludwigs-University Freiburg, 79104 Freiburg, Germany
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3
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Dubey PK, Singh S, Khalil H, Kommini GK, Bhat KM, Krishnamurthy P. Obg-like ATPase 1 Genetic Deletion Leads to Dilated Cardiomyopathy in Mice and Structural Changes in Drosophila Heart. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.05.28.596265. [PMID: 38854005 PMCID: PMC11160646 DOI: 10.1101/2024.05.28.596265] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2024]
Abstract
Cardiomyopathy, disease of the heart muscle, is a significant contributor to heart failure. The pathogenesis of cardiomyopathy is multifactorial and involves genetic, environmental, and lifestyle factors. Identifying and characterizing novel genes that contribute to cardiac pathophysiology are crucial for understanding cardiomyopathy and effective therapies. In this study, we investigated the role of a novel gene, Obg-like ATPase 1 ( Ola1 ), in cardiac pathophysiology using a cardiac-specific knockout mouse model as well as a Drosophila model. Our previous work demonstrated that OLA1 modulates the hypertrophic response of cardiomyocytes through the GSK-beta/beta-catenin signaling pathway. Furthermore, recent studies have suggested that OLA1 plays a critical role in organismal growth and development. For example, Ola1 null mice exhibit increased heart size and growth retardation. It is not known, however, if loss of function for Ola1 leads to dilated cardiomyopathy. We generated cardiac-specific Ola1 knockout mice (OLA1-cKO) to evaluate the role of OLA1 in cardiac pathophysiology. We found that Ola1 -cKO in mice leads to dilated cardiomyopathy (DCM) and left ventricular (LV) dysfunction. These mice developed severe LV dilatation, thinning of the LV wall, reduced LV function, and, in some cases, ventricular wall rupture and death. In Drosophila, RNAi-mediated knock-down specifically in developing heart cells led to the change in the structure of pericardial cells from round to elongated, and abnormal heart function. This also caused significant growth reduction and pupal lethality. Thus, our findings suggest that OLA1 is critical for cardiac homeostasis and that its deficiency leads to dilated cardiomyopathy and dysfunction. Furthermore, our study highlights the potential of the Ola1 gene as a therapeutic target for dilated cardiomyopathy and heart failure.
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4
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Pacheco M, D’Orazio KN, Lessen LN, Veltri AJ, Neiman Z, Loll-Krippleber R, Brown GW, Green R. Genetic screens in Saccharomyces cerevisiae identify a role for 40S ribosome recycling factors Tma20 and Tma22 in nonsense-mediated decay. G3 (BETHESDA, MD.) 2024; 14:jkad295. [PMID: 38198768 PMCID: PMC10917514 DOI: 10.1093/g3journal/jkad295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Revised: 08/29/2023] [Accepted: 12/06/2023] [Indexed: 01/12/2024]
Abstract
The decay of messenger RNA with a premature termination codon by nonsense-mediated decay (NMD) is an important regulatory pathway for eukaryotes and an essential pathway in mammals. NMD is typically triggered by the ribosome terminating at a stop codon that is aberrantly distant from the poly-A tail. Here, we use a fluorescence screen to identify factors involved in NMD in Saccharomyces cerevisiae. In addition to the known NMD factors, including the entire UPF family (UPF1, UPF2, and UPF3), as well as NMD4 and EBS1, we identify factors known to function in posttermination recycling and characterize their contribution to NMD. These observations in S. cerevisiae expand on data in mammals indicating that the 60S recycling factor ABCE1 is important for NMD by showing that perturbations in factors implicated in 40S recycling also correlate with a loss of NMD.
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Affiliation(s)
- Miguel Pacheco
- Department of Molecular Biology and Genetics, Howard Hughes Medical Institute, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Karole N D’Orazio
- Department of Molecular Biology and Genetics, Howard Hughes Medical Institute, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Laura N Lessen
- Department of Molecular Biology and Genetics, Howard Hughes Medical Institute, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Anthony J Veltri
- Department of Molecular Biology and Genetics, Howard Hughes Medical Institute, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Zachary Neiman
- Department of Molecular Biology and Genetics, Howard Hughes Medical Institute, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Raphael Loll-Krippleber
- Department of Biochemistry and Donnelly Centre, University of Toronto, Toronto, ON M5S 3E1, Canada
| | - Grant W Brown
- Department of Biochemistry and Donnelly Centre, University of Toronto, Toronto, ON M5S 3E1, Canada
| | - Rachel Green
- Department of Molecular Biology and Genetics, Howard Hughes Medical Institute, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
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5
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Takallou S, Hajikarimlou M, Al-Gafari M, Wang J, Kazmirchuk TDD, Said KB, Samanfar B, Golshani A. The Involvement of YNR069C in Protein Synthesis in the Baker's Yeast, Saccharomyces cerevisiae. BIOLOGY 2024; 13:138. [PMID: 38534408 DOI: 10.3390/biology13030138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2023] [Revised: 02/17/2024] [Accepted: 02/19/2024] [Indexed: 03/28/2024]
Abstract
Maintaining translation fidelity is a critical step within the process of gene expression. It requires the involvement of numerous regulatory elements to ensure the synthesis of functional proteins. The efficient termination of protein synthesis can play a crucial role in preserving this fidelity. Here, we report on investigating a protein of unknown function, YNR069C (also known as BSC5), for its activity in the process of translation. We observed a significant increase in the bypass of premature stop codons upon the deletion of YNR069C. Interestingly, the genomic arrangement of this ORF suggests a compatible mode of expression reliant on translational readthrough, incorporating the neighboring open reading frame. We also showed that the deletion of YNR069C results in an increase in the rate of translation. Based on our results, we propose that YNR069C may play a role in translation fidelity, impacting the overall quantity and quality of translation. Our genetic interaction analysis supports our hypothesis, associating the role of YNR069C to the regulation of protein synthesis.
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Affiliation(s)
- Sarah Takallou
- Ottawa Institute of Systems Biology, University of Ottawa, Ottawa, ON K1N 6N5, Canada
- Department of Biology, Carleton University, Ottawa, ON K1S 5B6, Canada
| | - Maryam Hajikarimlou
- Ottawa Institute of Systems Biology, University of Ottawa, Ottawa, ON K1N 6N5, Canada
- Department of Biology, Carleton University, Ottawa, ON K1S 5B6, Canada
| | - Mustafa Al-Gafari
- Ottawa Institute of Systems Biology, University of Ottawa, Ottawa, ON K1N 6N5, Canada
- Department of Biology, Carleton University, Ottawa, ON K1S 5B6, Canada
| | - Jiashu Wang
- Ottawa Institute of Systems Biology, University of Ottawa, Ottawa, ON K1N 6N5, Canada
- Department of Biology, Carleton University, Ottawa, ON K1S 5B6, Canada
| | - Thomas David Daniel Kazmirchuk
- Ottawa Institute of Systems Biology, University of Ottawa, Ottawa, ON K1N 6N5, Canada
- Department of Biology, Carleton University, Ottawa, ON K1S 5B6, Canada
| | - Kamaledin B Said
- Department of Pathology and Microbiology, College of Medicine, University of Hail, Hail 55476, Saudi Arabia
| | - Bahram Samanfar
- Ottawa Institute of Systems Biology, University of Ottawa, Ottawa, ON K1N 6N5, Canada
- Department of Biology, Carleton University, Ottawa, ON K1S 5B6, Canada
- Agriculture and Agri-Food Canada, Ottawa Research and Development Centre (ORDC), Ottawa, ON K1A 0C6, Canada
| | - Ashkan Golshani
- Ottawa Institute of Systems Biology, University of Ottawa, Ottawa, ON K1N 6N5, Canada
- Department of Biology, Carleton University, Ottawa, ON K1S 5B6, Canada
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6
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Kovacs M, Geltinger F, Schartel L, Pöschl S, Briza P, Paschinger M, Boros K, Felder TK, Wimmer H, Duschl J, Rinnerthaler M. Ola1p trafficking indicates an interaction network between mitochondria, lipid droplets, and stress granules in times of stress. J Lipid Res 2023; 64:100473. [PMID: 37949369 PMCID: PMC10757043 DOI: 10.1016/j.jlr.2023.100473] [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: 07/03/2023] [Revised: 09/25/2023] [Accepted: 11/01/2023] [Indexed: 11/12/2023] Open
Abstract
Protein aggregates arise naturally under normal physiological conditions, but their formation is accelerated by age or stress-induced protein misfolding. When the stressful event dissolves, these aggregates are removed by mechanisms, such as aggrephagy, chaperone-mediated autophagy, refolding attempts, or the proteasome. It was recently shown that mitochondria in yeast cells may support these primarily cytosolic processes. Protein aggregates attach to mitochondria, and misfolded proteins are transported into the matrix and degraded by mitochondria-specific proteases. Using a proximity labeling method and colocalization with an established stress granule (SG) marker, we were able to show that these mitochondria-localized aggregates that harbor the "super aggregator" Ola1p are, in fact, SGs. Our in vivo and in vitro studies have revealed that Ola1p can be transferred from mitochondria to lipid droplets (LDs). This "mitochondria to LD" aggregate transfer dampens proteotoxic effects. The LD-based protein aggregate removal system gains importance when other proteolytic systems fail. Furthermore, we were able to show that the distribution of SGs is drastically altered in LD-deficient yeast cells, demonstrating that LDs play a role in the SG life cycle.
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Affiliation(s)
- Melanie Kovacs
- Department of Biosciences, Paris-Lodron University Salzburg, Salzburg, Austria
| | - Florian Geltinger
- Department of Biosciences, Paris-Lodron University Salzburg, Salzburg, Austria; Institute of Functional Anatomy, Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
| | - Lukas Schartel
- Department of Biosciences, Paris-Lodron University Salzburg, Salzburg, Austria; Biocentre, Departments of Biology and Chemistry, Johannes Gutenberg University and Institute of Molecular Biology, Mainz, Germany
| | - Simon Pöschl
- Department of Biosciences, Paris-Lodron University Salzburg, Salzburg, Austria
| | - Peter Briza
- Department of Biosciences, Paris-Lodron University Salzburg, Salzburg, Austria
| | - Manuel Paschinger
- Department of Biosciences, Paris-Lodron University Salzburg, Salzburg, Austria
| | - Kitti Boros
- Department of Biosciences, Paris-Lodron University Salzburg, Salzburg, Austria
| | - Thomas Klaus Felder
- Department of Laboratory Medicine, Paracelsus Medical University, Salzburg, Austria
| | - Herbert Wimmer
- Department of Biosciences, Paris-Lodron University Salzburg, Salzburg, Austria
| | - Jutta Duschl
- Department of Biosciences, Paris-Lodron University Salzburg, Salzburg, Austria
| | - Mark Rinnerthaler
- Department of Biosciences, Paris-Lodron University Salzburg, Salzburg, Austria.
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7
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Piao W, Li C, Sun P, Yang M, Ding Y, Song W, Jia Y, Yu L, Lu Y, Jin H. Identification of RNA-Binding Protein Targets with HyperTRIBE in Saccharomyces cerevisiae. Int J Mol Sci 2023; 24:ijms24109033. [PMID: 37240377 DOI: 10.3390/ijms24109033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Revised: 05/17/2023] [Accepted: 05/18/2023] [Indexed: 05/28/2023] Open
Abstract
As a master regulator in cells, RNA-binding protein (RBP) plays critical roles in organismal development, metabolism and various diseases. It regulates gene expression at various levels mostly by specific recognition of target RNA. The traditional CLIP-seq method to detect transcriptome-wide RNA targets of RBP is less efficient in yeast due to the low UV transmissivity of their cell walls. Here, we established an efficient HyperTRIBE (Targets of RNA-binding proteins Identified By Editing) in yeast, by fusing an RBP to the hyper-active catalytic domain of human RNA editing enzyme ADAR2 and expressing the fusion protein in yeast cells. The target transcripts of RBP were marked with new RNA editing events and identified by high-throughput sequencing. We successfully applied HyperTRIBE to identifying the RNA targets of two yeast RBPs, KHD1 and BFR1. The antibody-free HyperTRIBE has competitive advantages including a low background, high sensitivity and reproducibility, as well as a simple library preparation procedure, providing a reliable strategy for RBP target identification in Saccharomyces cerevisiae.
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Affiliation(s)
- Weilan Piao
- Key Laboratory of Molecular Medicine and Biotherapy, School of Life Science, Beijing Institute of Technology, No. 5 South Zhongguancun Street, Beijing 100081, China
| | - Chong Li
- Key Laboratory of Molecular Medicine and Biotherapy, School of Life Science, Beijing Institute of Technology, No. 5 South Zhongguancun Street, Beijing 100081, China
| | - Pengkun Sun
- Key Laboratory of Molecular Medicine and Biotherapy, School of Life Science, Beijing Institute of Technology, No. 5 South Zhongguancun Street, Beijing 100081, China
| | - Miaomiao Yang
- Key Laboratory of Molecular Medicine and Biotherapy, School of Life Science, Beijing Institute of Technology, No. 5 South Zhongguancun Street, Beijing 100081, China
| | - Yansong Ding
- Key Laboratory of Molecular Medicine and Biotherapy, School of Life Science, Beijing Institute of Technology, No. 5 South Zhongguancun Street, Beijing 100081, China
| | - Wei Song
- Key Laboratory of Molecular Medicine and Biotherapy, School of Life Science, Beijing Institute of Technology, No. 5 South Zhongguancun Street, Beijing 100081, China
| | - Yunxiao Jia
- Key Laboratory of Molecular Medicine and Biotherapy, School of Life Science, Beijing Institute of Technology, No. 5 South Zhongguancun Street, Beijing 100081, China
| | - Liqun Yu
- Key Laboratory of Molecular Medicine and Biotherapy, School of Life Science, Beijing Institute of Technology, No. 5 South Zhongguancun Street, Beijing 100081, China
| | - Yanming Lu
- Key Laboratory of Molecular Medicine and Biotherapy, School of Life Science, Beijing Institute of Technology, No. 5 South Zhongguancun Street, Beijing 100081, China
| | - Hua Jin
- Key Laboratory of Molecular Medicine and Biotherapy, School of Life Science, Beijing Institute of Technology, No. 5 South Zhongguancun Street, Beijing 100081, China
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8
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Hajikarimlou M, Hooshyar M, Sunba N, Nazemof N, Moutaoufik MT, Phanse S, Said KB, Babu M, Holcik M, Samanfar B, Smith M, Golshani A. A Correlation between 3'-UTR of OXA1 Gene and Yeast Mitochondrial Translation. J Fungi (Basel) 2023; 9:jof9040445. [PMID: 37108900 PMCID: PMC10143089 DOI: 10.3390/jof9040445] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2023] [Revised: 03/27/2023] [Accepted: 04/01/2023] [Indexed: 04/29/2023] Open
Abstract
Mitochondria possess their own DNA (mtDNA) and are capable of carrying out their transcription and translation. Although protein synthesis can take place in mitochondria, the majority of the proteins in mitochondria have nuclear origin. 3' and 5' untranslated regions of mRNAs (3'-UTR and 5'-UTR, respectively) are thought to play key roles in directing and regulating the activity of mitochondria mRNAs. Here we investigate the association between the presence of 3'-UTR from OXA1 gene on a prokaryotic reporter mRNA and mitochondrial translation in yeast. OXA1 is a nuclear gene that codes for mitochondrial inner membrane insertion protein and its 3'-UTR is shown to direct its mRNA toward mitochondria. It is not clear, however, if this mRNA may also be translated by mitochondria. In the current study, using a β-galactosidase reporter gene, we provide genetic evidence for a correlation between the presence of 3'-UTR of OXA1 on an mRNA and mitochondrial translation in yeast.
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Affiliation(s)
- Maryam Hajikarimlou
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, ON K1S 5B6, Canada
| | - Mohsen Hooshyar
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, ON K1S 5B6, Canada
| | - Noor Sunba
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, ON K1S 5B6, Canada
| | - Nazila Nazemof
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, ON K1S 5B6, Canada
| | - Mohamed Taha Moutaoufik
- Department of Biochemistry, Research and Innovation Centre, University of Regina, Regina, SK S4S 0A2, Canada
| | - Sadhena Phanse
- Department of Biochemistry, Research and Innovation Centre, University of Regina, Regina, SK S4S 0A2, Canada
| | - Kamaledin B Said
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, ON K1S 5B6, Canada
- Department of Pathology and Microbiology, College of Medicine, University of Hail, Hail P.O. Box 2240, Saudi Arabia
| | - Mohan Babu
- Department of Biochemistry, Research and Innovation Centre, University of Regina, Regina, SK S4S 0A2, Canada
| | - Martin Holcik
- Department of Health Sciences, Carleton University, Ottawa, ON K1S 5B6, Canada
| | - Bahram Samanfar
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, ON K1S 5B6, Canada
- Agriculture and Agri-Food Canada, Ottawa Research and Development Centre (ORDC), Ottawa, ON K2H 8S2, Canada
| | - Myron Smith
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, ON K1S 5B6, Canada
| | - Ashkan Golshani
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, ON K1S 5B6, Canada
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9
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Zackin MT, Stieglitz JT, Van Deventer JA. Genome-Wide Screen for Enhanced Noncanonical Amino Acid Incorporation in Yeast. ACS Synth Biol 2022; 11:3669-3680. [PMID: 36346914 PMCID: PMC10065164 DOI: 10.1021/acssynbio.2c00267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Numerous applications of noncanonical amino acids (ncAAs) in basic biology and therapeutic development require efficient protein biosynthesis using an expanded genetic code. However, achieving such incorporation at repurposed stop codons in cells is generally inefficient and limited by complex cellular processes that preserve the fidelity of protein synthesis. A more comprehensive understanding of the processes that contribute to ncAA incorporation would aid in the development of genomic engineering strategies for augmenting genetic code manipulation. In this work, we used a series of fluorescent reporters to screen a pooled Saccharomyces cerevisiae molecular barcoded yeast knockout (YKO) collection. Fluorescence-activated cell sorting enabled isolation of strains encoding single-gene deletions exhibiting improved ncAA incorporation efficiency in response to the amber (TAG) stop codon; 55 unique candidate deletions were identified. The deleted genes encoded for proteins that participate in diverse cellular processes, including many genes that have no known connection with protein translation. We then verified that two knockouts, yil014c-aΔ and alo1Δ, exhibited improved ncAA incorporation efficiency starting from independently acquired strains possessing the knockouts. Using additional orthogonal translation systems and ncAAs, we determined that yil014c-aΔ and alo1Δ enhance ncAA incorporation efficiency without loss of fidelity over a wide range of conditions. Our findings highlight opportunities for further modulating gene expression with genetic, genomic, and synthetic biology approaches to improve ncAA incorporation efficiency. In addition, these discoveries have the potential to enhance our fundamental understanding of protein translation. Ultimately, cells that efficiently biosynthesize ncAA-containing proteins will streamline the realization of applications utilizing expanded genetic codes ranging from basic biology to drug discovery.
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Affiliation(s)
- Matthew T. Zackin
- Chemical and Biological Engineering Department, Tufts University, Medford, Massachusetts 02155, USA
| | - Jessica T. Stieglitz
- Chemical and Biological Engineering Department, Tufts University, Medford, Massachusetts 02155, USA
| | - James A. Van Deventer
- Chemical and Biological Engineering Department, Tufts University, Medford, Massachusetts 02155, USA
- Biomedical Engineering Department, Tufts University, Medford, Massachusetts 02155, USA
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10
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The Role of the Universally Conserved ATPase YchF/Ola1 in Translation Regulation during Cellular Stress. Microorganisms 2021; 10:microorganisms10010014. [PMID: 35056463 PMCID: PMC8779481 DOI: 10.3390/microorganisms10010014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2021] [Revised: 12/16/2021] [Accepted: 12/20/2021] [Indexed: 11/17/2022] Open
Abstract
The ability to respond to metabolic or environmental changes is an essential feature in all cells and involves both transcriptional and translational regulators that adjust the metabolic activity to fluctuating conditions. While transcriptional regulation has been studied in detail, the important role of the ribosome as an additional player in regulating gene expression is only beginning to emerge. Ribosome-interacting proteins are central to this translational regulation and include universally conserved ribosome interacting proteins, such as the ATPase YchF (Ola1 in eukaryotes). In both eukaryotes and bacteria, the cellular concentrations of YchF/Ola1 determine the ability to cope with different stress conditions and are linked to several pathologies in humans. The available data indicate that YchF/Ola1 regulates the stress response via controlling non-canonical translation initiation and via protein degradation. Although the molecular mechanisms appear to be different between bacteria and eukaryotes, increased non-canonical translation initiation is a common consequence of YchF/Ola1 regulated translational control in E. coli and H. sapiens. In this review, we summarize recent insights into the role of the universally conserved ATPase YchF/Ola1 in adapting translation to unfavourable conditions.
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11
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Dannenmaier S, Desroches Altamirano C, Schüler L, Zhang Y, Hummel J, Milanov M, Oeljeklaus S, Koch HG, Rospert S, Alberti S, Warscheid B. Quantitative proteomics identifies the universally conserved ATPase Ola1p as a positive regulator of heat shock response in Saccharomyces cerevisiae. J Biol Chem 2021; 297:101050. [PMID: 34571008 PMCID: PMC8531669 DOI: 10.1016/j.jbc.2021.101050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Revised: 07/24/2021] [Accepted: 08/04/2021] [Indexed: 12/02/2022] Open
Abstract
The universally conserved P-loop ATPase Ola1 is implicated in various cellular stress response pathways, as well as in cancer and tumor progression. However, Ola1p functions are divergent between species, and the involved mechanisms are only poorly understood. Here, we studied the role of Ola1p in the heat shock response of the yeast Saccharomyces cerevisiae using a combination of quantitative and pulse labeling-based proteomics approaches, in vitro studies, and cell-based assays. Our data show that when heat stress is applied to cells lacking Ola1p, the expression of stress-protective proteins is enhanced. During heat stress Ola1p associates with detergent-resistant protein aggregates and rapidly forms assemblies that localize to stress granules. The assembly of Ola1p was also observed in vitro using purified protein and conditions, which resembled those in living cells. We show that loss of Ola1p results in increased protein ubiquitination of detergent-insoluble aggregates recovered from heat-shocked cells. When cells lacking Ola1p were subsequently relieved from heat stress, reinitiation of translation was delayed, whereas, at the same time, de novo synthesis of central factors required for protein refolding and the clearance of aggregates was enhanced when compared with wild-type cells. The combined data suggest that upon acute heat stress, Ola1p is involved in the stabilization of misfolded proteins, which become sequestered in cytoplasmic stress granules. This function of Ola1p enables cells to resume translation in a timely manner as soon as heat stress is relieved.
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Affiliation(s)
- Stefan Dannenmaier
- Biochemistry and Functional Proteomics, Institute of Biology II, Faculty of Biology, University of Freiburg, Freiburg, Germany
| | | | - Lisa Schüler
- Biochemistry and Functional Proteomics, Institute of Biology II, Faculty of Biology, University of Freiburg, Freiburg, Germany
| | - Ying Zhang
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Johannes Hummel
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Martin Milanov
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Silke Oeljeklaus
- Biochemistry and Functional Proteomics, Institute of Biology II, Faculty of Biology, University of Freiburg, Freiburg, Germany
| | - Hans-Georg Koch
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Sabine Rospert
- Institute of Biochemistry and Molecular Biology, ZBMZ, Faculty of Medicine, University of Freiburg, Freiburg, Germany; BIOSS Centre for Biological Signalling Studies, University of Freiburg, Freiburg, Germany
| | - Simon Alberti
- BIOTEC and CMCB, Technische Universität Dresden, Dresden, Germany
| | - Bettina Warscheid
- Biochemistry and Functional Proteomics, Institute of Biology II, Faculty of Biology, University of Freiburg, Freiburg, Germany; Signalling Research Centres BIOSS and CIBSS, University of Freiburg, Freiburg, Germany.
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12
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Landwehr V, Milanov M, Angebauer L, Hong J, Jüngert G, Hiersemenzel A, Siebler A, Schmit F, Öztürk Y, Dannenmaier S, Drepper F, Warscheid B, Koch HG. The Universally Conserved ATPase YchF Regulates Translation of Leaderless mRNA in Response to Stress Conditions. Front Mol Biosci 2021; 8:643696. [PMID: 34026826 PMCID: PMC8138138 DOI: 10.3389/fmolb.2021.643696] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Accepted: 04/13/2021] [Indexed: 12/14/2022] Open
Abstract
The universally conserved P-loop GTPases control diverse cellular processes, like signal transduction, ribosome assembly, cell motility, and intracellular transport and translation. YchF belongs to the Obg-family of P-loop GTPases and is one of the least characterized member of this family. It is unique because it preferentially hydrolyses ATP rather than GTP, but its physiological role is largely unknown. Studies in different organisms including humans suggest a possible role of YchF in regulating the cellular adaptation to stress conditions. In the current study, we explored the role of YchF in the model organism Escherichia coli. By western blot and promoter fusion experiments, we demonstrate that YchF levels decrease during stress conditions or when cells enter stationary phase. The decline in YchF levels trigger increased stress resistance and cells lacking YchF are resistant to multiple stress conditions, like oxidative stress, replication stress, or translational stress. By in vivo site directed cross-linking we demonstrate that YchF interacts with the translation initiation factor 3 (IF3) and with multiple ribosomal proteins at the surface of the small ribosomal subunit. The absence of YchF enhances the anti-association activity of IF3, stimulates the translation of leaderless mRNAs, and increases the resistance against the endoribonuclease MazF, which generates leaderless mRNAs during stress conditions. In summary, our data identify YchF as a stress-responsive regulator of leaderless mRNA translation.
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Affiliation(s)
- Victoria Landwehr
- Institute for Biochemistry and Molecular Biology, Zentrum für Biochemie und Molekulare Medizin, Faculty of Medicine, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany
| | - Martin Milanov
- Institute for Biochemistry and Molecular Biology, Zentrum für Biochemie und Molekulare Medizin, Faculty of Medicine, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany
- Faculty of Biology, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany
- Spemann Graduate School of Biology and Medicine, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany
| | - Larissa Angebauer
- Institute for Biochemistry and Molecular Biology, Zentrum für Biochemie und Molekulare Medizin, Faculty of Medicine, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany
- Faculty of Biology, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany
| | - Jiang Hong
- Institute for Biochemistry and Molecular Biology, Zentrum für Biochemie und Molekulare Medizin, Faculty of Medicine, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany
- Faculty of Biology, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany
| | - Gabriela Jüngert
- Institute for Biochemistry and Molecular Biology, Zentrum für Biochemie und Molekulare Medizin, Faculty of Medicine, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany
| | - Anna Hiersemenzel
- Institute for Biochemistry and Molecular Biology, Zentrum für Biochemie und Molekulare Medizin, Faculty of Medicine, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany
| | - Ariane Siebler
- Institute for Biochemistry and Molecular Biology, Zentrum für Biochemie und Molekulare Medizin, Faculty of Medicine, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany
| | - Fränk Schmit
- Institute for Biochemistry and Molecular Biology, Zentrum für Biochemie und Molekulare Medizin, Faculty of Medicine, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany
| | - Yavuz Öztürk
- Institute for Biochemistry and Molecular Biology, Zentrum für Biochemie und Molekulare Medizin, Faculty of Medicine, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany
| | - Stefan Dannenmaier
- Biochemistry and Functional Proteomics, Institute of Biology II, Faculty of Biology, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany
| | - Friedel Drepper
- Biochemistry and Functional Proteomics, Institute of Biology II, Faculty of Biology, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany
| | - Bettina Warscheid
- Spemann Graduate School of Biology and Medicine, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany
- Biochemistry and Functional Proteomics, Institute of Biology II, Faculty of Biology, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany
- Signalling Research Centers BIOSS and CIBSS, University Freiburg, Freiburg, Germany
| | - Hans-Georg Koch
- Institute for Biochemistry and Molecular Biology, Zentrum für Biochemie und Molekulare Medizin, Faculty of Medicine, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany
- Spemann Graduate School of Biology and Medicine, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany
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13
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Hajikarimlou M, Hunt K, Kirby G, Takallou S, Jagadeesan SK, Omidi K, Hooshyar M, Burnside D, Moteshareie H, Babu M, Smith M, Holcik M, Samanfar B, Golshani A. Lithium Chloride Sensitivity in Yeast and Regulation of Translation. Int J Mol Sci 2020; 21:ijms21165730. [PMID: 32785068 PMCID: PMC7461102 DOI: 10.3390/ijms21165730] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Revised: 08/06/2020] [Accepted: 08/07/2020] [Indexed: 12/18/2022] Open
Abstract
For decades, lithium chloride (LiCl) has been used as a treatment option for those living with bipolar disorder (BD). As a result, many studies have been conducted to examine its mode of action, toxicity, and downstream cellular responses. We know that LiCl is able to affect cell signaling and signaling transduction pathways through protein kinase C and glycogen synthase kinase-3, which are considered to be important in regulating gene expression at the translational level. However, additional downstream effects require further investigation, especially in translation pathway. In yeast, LiCl treatment affects the expression, and thus the activity, of PGM2, a phosphoglucomutase involved in sugar metabolism. Inhibition of PGM2 leads to the accumulation of intermediate metabolites of galactose metabolism causing cell toxicity. However, it is not fully understood how LiCl affects gene expression in this matter. In this study, we identified three genes, NAM7, PUS2, and RPL27B, which increase yeast LiCl sensitivity when deleted. We further demonstrate that NAM7, PUS2, and RPL27B influence translation and exert their activity through the 5′-Untranslated region (5′-UTR) of PGM2 mRNA in yeast.
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Affiliation(s)
- Maryam Hajikarimlou
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, ON K1S 5B6, Canada; (M.H.); (K.H.); (G.K.); (S.T.); (S.K.J.); (K.O.); (M.H.); (D.B.); (H.M.); (M.S.); (B.S.)
| | - Kathryn Hunt
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, ON K1S 5B6, Canada; (M.H.); (K.H.); (G.K.); (S.T.); (S.K.J.); (K.O.); (M.H.); (D.B.); (H.M.); (M.S.); (B.S.)
| | - Grace Kirby
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, ON K1S 5B6, Canada; (M.H.); (K.H.); (G.K.); (S.T.); (S.K.J.); (K.O.); (M.H.); (D.B.); (H.M.); (M.S.); (B.S.)
| | - Sarah Takallou
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, ON K1S 5B6, Canada; (M.H.); (K.H.); (G.K.); (S.T.); (S.K.J.); (K.O.); (M.H.); (D.B.); (H.M.); (M.S.); (B.S.)
| | - Sasi Kumar Jagadeesan
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, ON K1S 5B6, Canada; (M.H.); (K.H.); (G.K.); (S.T.); (S.K.J.); (K.O.); (M.H.); (D.B.); (H.M.); (M.S.); (B.S.)
| | - Katayoun Omidi
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, ON K1S 5B6, Canada; (M.H.); (K.H.); (G.K.); (S.T.); (S.K.J.); (K.O.); (M.H.); (D.B.); (H.M.); (M.S.); (B.S.)
| | - Mohsen Hooshyar
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, ON K1S 5B6, Canada; (M.H.); (K.H.); (G.K.); (S.T.); (S.K.J.); (K.O.); (M.H.); (D.B.); (H.M.); (M.S.); (B.S.)
| | - Daniel Burnside
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, ON K1S 5B6, Canada; (M.H.); (K.H.); (G.K.); (S.T.); (S.K.J.); (K.O.); (M.H.); (D.B.); (H.M.); (M.S.); (B.S.)
| | - Houman Moteshareie
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, ON K1S 5B6, Canada; (M.H.); (K.H.); (G.K.); (S.T.); (S.K.J.); (K.O.); (M.H.); (D.B.); (H.M.); (M.S.); (B.S.)
| | - Mohan Babu
- Department of Biochemistry, Research and Innovation Centre, University of Regina, Regina, SK S4S 0A2, Canada;
| | - Myron Smith
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, ON K1S 5B6, Canada; (M.H.); (K.H.); (G.K.); (S.T.); (S.K.J.); (K.O.); (M.H.); (D.B.); (H.M.); (M.S.); (B.S.)
| | - Martin Holcik
- Department of Health Sciences, Carleton University, Ottawa, ON K1S 5B6, Canada;
| | - Bahram Samanfar
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, ON K1S 5B6, Canada; (M.H.); (K.H.); (G.K.); (S.T.); (S.K.J.); (K.O.); (M.H.); (D.B.); (H.M.); (M.S.); (B.S.)
- Agriculture and Agri-Food Canada, Ottawa Research and Development Centre (ORDC), Ottawa, ON K1Y 4X2, Canada
| | - Ashkan Golshani
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, ON K1S 5B6, Canada; (M.H.); (K.H.); (G.K.); (S.T.); (S.K.J.); (K.O.); (M.H.); (D.B.); (H.M.); (M.S.); (B.S.)
- Correspondence:
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14
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Hajikarimlou M, Moteshareie H, Omidi K, Hooshyar M, Shaikho S, Kazmirchuk T, Burnside D, Takallou S, Zare N, Jagadeesan SK, Puchacz N, Babu M, Smith M, Holcik M, Samanfar B, Golshani A. Sensitivity of yeast to lithium chloride connects the activity of YTA6 and YPR096C to translation of structured mRNAs. PLoS One 2020; 15:e0235033. [PMID: 32639961 PMCID: PMC7343135 DOI: 10.1371/journal.pone.0235033] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Accepted: 06/08/2020] [Indexed: 11/18/2022] Open
Abstract
Lithium Chloride (LiCl) toxicity, mode of action and cellular responses have been the subject of active investigations over the past decades. In yeast, LiCl treatment is reported to reduce the activity and alters the expression of PGM2, a gene that encodes a phosphoglucomutase involved in sugar metabolism. Reduced activity of phosphoglucomutase in the presence of galactose causes an accumulation of intermediate metabolites of galactose metabolism leading to a number of phenotypes including growth defect. In the current study, we identify two understudied yeast genes, YTA6 and YPR096C that when deleted, cell sensitivity to LiCl is increased when galactose is used as a carbon source. The 5’-UTR of PGM2 mRNA is structured. Using this region, we show that YTA6 and YPR096C influence the translation of PGM2 mRNA.
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Affiliation(s)
- Maryam Hajikarimlou
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, Ontario, Canada
| | - Houman Moteshareie
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, Ontario, Canada
| | - Katayoun Omidi
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, Ontario, Canada
| | - Mohsen Hooshyar
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, Ontario, Canada
| | - Sarah Shaikho
- Molecular Biomedicine Program, Children's Hospital of Eastern Ontario Research Institute, Ottawa, Ontario, Canada
| | - Tom Kazmirchuk
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, Ontario, Canada
| | - Daniel Burnside
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, Ontario, Canada
| | - Sarah Takallou
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, Ontario, Canada
| | - Narges Zare
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, Ontario, Canada
| | - Sasi Kumar Jagadeesan
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, Ontario, Canada
| | - Nathalie Puchacz
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, Ontario, Canada
| | - Mohan Babu
- Department of Biochemistry, Research and Innovation Centre, University of Regina, Regina, Canada
| | - Myron Smith
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, Ontario, Canada
| | - Martin Holcik
- Department of Health Sciences, Carleton University, Ottawa, Ontario, Canada
| | - Bahram Samanfar
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, Ontario, Canada.,Agriculture and Agri-Food Canada, Ottawa Research and Development Centre (ORDC), Ottawa, Ontario, Canada
| | - Ashkan Golshani
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, Ontario, Canada
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15
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Kong Y, Wang Q, Cao F, Zhang X, Fang Z, Shi P, Wang H, Shen Y, Huang Z. BSC2 enhances cell resistance to AmB by inhibiting oxidative damage in Saccharomyces cerevisiae. Free Radic Res 2020; 54:231-243. [DOI: 10.1080/10715762.2020.1751151] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Yingying Kong
- Key Lab of Science & Technology of Eco-textile, Ministry of Education, College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai, China
| | - Qiao Wang
- Key Lab of Science & Technology of Eco-textile, Ministry of Education, College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai, China
- Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Beijing, People’s Republic of China
| | - Fangqi Cao
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China
| | - Xiaoyu Zhang
- Key Lab of Science & Technology of Eco-textile, Ministry of Education, College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai, China
| | - Zhijia Fang
- Key Lab of Science & Technology of Eco-textile, Ministry of Education, College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai, China
| | - Ping Shi
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China
| | - Handong Wang
- Qinghai Key Laboratory of Qinghai-Tibet Plateau Biological Resources, Northwest Institute of Plateau Biology, The Chinese Academy of Sciences, Xining, China
| | - Yuhu Shen
- Qinghai Key Laboratory of Qinghai-Tibet Plateau Biological Resources, Northwest Institute of Plateau Biology, The Chinese Academy of Sciences, Xining, China
| | - Zhiwei Huang
- Key Lab of Science & Technology of Eco-textile, Ministry of Education, College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai, China
- Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Beijing, People’s Republic of China
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16
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Huang S, Zhang C, Sun C, Hou Y, Zhang Y, Tam NL, Wang Z, Yu J, Huang B, Zhuang H, Zhou Z, Ma Z, Sun Z, He X, Zhou Q, Hou B, Wu L. Obg-like ATPase 1 (OLA1) overexpression predicts poor prognosis and promotes tumor progression by regulating P21/CDK2 in hepatocellular carcinoma. Aging (Albany NY) 2020; 12:3025-3041. [PMID: 32045367 PMCID: PMC7041778 DOI: 10.18632/aging.102797] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2019] [Accepted: 01/12/2020] [Indexed: 12/19/2022]
Abstract
Background: Obg-like ATPase 1 (OLA1) has been found to have a dual role in cancers. However, the relationship between OLA1 and hepatocellular carcinoma (HCC) remains unclear. Results: High expression of OLA1 in HCC was detected in public datasets and clinical samples, and correlated with poor prognosis. Downregulation of OLA1 significantly inhibited the proliferation, migration, invasion and tumorigenicity of HCC cells. Mechanistically, GSEA showed that OLA1 might promote tumor progression by regulating the cell cycle and apoptosis. In addition, OLA1 knockdown resulted in G0/G1 phase arrest and high levels of apoptosis. OLA1 could bind with P21 and upregulate CDK2 expression to promote HCC progression. Conclusions: Overall, these findings uncover a role for OLA1 in regulating the proliferation and apoptosis of HCC cells. Materials and methods: The Cancer Genome Atlas and Gene Expression Omnibus datasets were analyzed to identify gene expression. Immunohistochemistry staining, western blot and real-time polymerase chain reaction were performed to evaluate OLA1 expression in samples. Cell count Kit-8, wound-healing, transwell and flow cytometry assays were used to analyze HCC cell progression. Subcutaneous xenotransplantation models were used to investigate the role of OLA1 in vivo. Coimmunoprecipitation was used to analyze protein interactions.
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Affiliation(s)
- Shanzhou Huang
- Department of General Surgery, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, School of Medicine, South China University of Technology, Guangzhou 510080, China
| | - Chuanzhao Zhang
- Department of General Surgery, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, School of Medicine, South China University of Technology, Guangzhou 510080, China
| | - Chengjun Sun
- Organ Transplant Center, The First Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510080, China
| | - Yuchen Hou
- Organ Transplant Center, The First Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510080, China
| | - Yixi Zhang
- Organ Transplant Center, The First Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510080, China
| | - Nga Lei Tam
- The Fifth Affiliated Hospital of Sun Yat-Sen University, Division of Hepatobiliary Surgery, Zhuhai 519000, China
| | - Zekang Wang
- Organ Transplant Center, The First Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510080, China
| | - Jia Yu
- Organ Transplant Center, The First Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510080, China
| | - Bowen Huang
- Department of General Surgery, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, School of Medicine, South China University of Technology, Guangzhou 510080, China
| | - Hongkai Zhuang
- Department of General Surgery, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, School of Medicine, South China University of Technology, Guangzhou 510080, China
| | - Zixuan Zhou
- Department of General Surgery, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, School of Medicine, South China University of Technology, Guangzhou 510080, China
| | - Zuyi Ma
- Department of General Surgery, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, School of Medicine, South China University of Technology, Guangzhou 510080, China
| | - Zhonghai Sun
- Department of General Surgery, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, School of Medicine, South China University of Technology, Guangzhou 510080, China
| | - Xiaoshun He
- Organ Transplant Center, The First Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510080, China
| | - Qi Zhou
- Department of Liver Surgery, The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou 510080, China.,China Department of General Surgery, Hui Ya Hospital of The First Affiliated Hospital, Sun Yat-Sen University, Huizhou, Guangdong 516081, China
| | - Baohua Hou
- Department of General Surgery, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, School of Medicine, South China University of Technology, Guangzhou 510080, China
| | - Linwei Wu
- Organ Transplant Center, The First Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510080, China
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17
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Narasimhan G, Henderson J, Luong HT, Rajasekaran NS, Qin G, Zhang J, Krishnamurthy P. OBG-like ATPase 1 inhibition attenuates angiotensin II-induced hypertrophic response in human ventricular myocytes via GSK-3beta/beta-catenin signalling. Clin Exp Pharmacol Physiol 2019; 46:743-751. [PMID: 31063653 DOI: 10.1111/1440-1681.13101] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Revised: 04/23/2019] [Accepted: 04/30/2019] [Indexed: 11/28/2022]
Abstract
Obg-like ATPase 1 (OLA1) that possesses both GTP and ATP hydrolyzing activities has been shown to be involved in translational regulation of cancer cell growth and survival. Also, GSK3β signalling has been implicated in cardiac development and disease. However, the role of OLA1 in pathological cardiac hypertrophy is unknown. We sought to understand the mechanism by which OLA1 regulates GSK3β-β-Catenin signalling and its functional significance in angiotensin-II (ANG II)-induced cardiac hypertrophic response. OLA1 function and its endogenous interaction with GSK3β/β-catenin signalling in cultured human ventricular cardiomyocytes (AC16 cells) and mouse hearts (in vivo) was evaluated with/without ANG II-stimulated hypertrophic response. ANG II administration in mice increases myocardial OLA1 protein expression with a corresponding increase in GSK3β phosphorylation and decrease in β-Catenin phosphorylation. Cultured cardiomyocytes treated with ANG II show endogenous interaction between OLA1 and GSK3β, nuclear accumulation of β-Catenin and significant increase in cell size and expression of hypertrophic marker genes such as atrial natriuretic factor (ANF; NPPA) and β-myosin heavy chain (MYH7). Intriguingly, OLA1 inhibition attenuates the above hypertrophic response in cardiomyocytes. Taken together, our data suggest that OLA1 plays a detrimental role in hypertrophic response via GSK3β/β-catenin signalling. Translation strategies to target OLA1 might potentially limit the underlying molecular derangements leading to left ventricular dysfunction in patients with maladaptive cardiac hypertrophy.
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Affiliation(s)
- Gayathri Narasimhan
- Department of Biomedical Engineering, Schools of Medicine and Engineering, University of Alabama at Birmingham, Birmingham, Alabama
| | - John Henderson
- Department of Biomedical Engineering, Schools of Medicine and Engineering, University of Alabama at Birmingham, Birmingham, Alabama
| | - Hien T Luong
- Department of Biomedical Engineering, Schools of Medicine and Engineering, University of Alabama at Birmingham, Birmingham, Alabama
| | - Namakkal Soorapan Rajasekaran
- Division of Molecular & Cellular Pathology, Department of Pathology, School of Medicine, University of Alabama at Birmingham, Birmingham, Alabama
| | - Gangjian Qin
- Department of Biomedical Engineering, Schools of Medicine and Engineering, University of Alabama at Birmingham, Birmingham, Alabama
| | - Jianyi Zhang
- Department of Biomedical Engineering, Schools of Medicine and Engineering, University of Alabama at Birmingham, Birmingham, Alabama
| | - Prasanna Krishnamurthy
- Department of Biomedical Engineering, Schools of Medicine and Engineering, University of Alabama at Birmingham, Birmingham, Alabama
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18
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Heavy metal sensitivities of gene deletion strains for ITT1 and RPS1A connect their activities to the expression of URE2, a key gene involved in metal detoxification in yeast. PLoS One 2018; 13:e0198704. [PMID: 30231023 PMCID: PMC6145592 DOI: 10.1371/journal.pone.0198704] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2018] [Accepted: 08/28/2018] [Indexed: 11/19/2022] Open
Abstract
Heavy metal and metalloid contaminations are among the most concerning types of pollutant in the environment. Consequently, it is important to investigate the molecular mechanisms of cellular responses and detoxification pathways for these compounds in living organisms. To date, a number of genes have been linked to the detoxification process. The expression of these genes can be controlled at both transcriptional and translational levels. In baker’s yeast, Saccharomyces cerevisiae, resistance to a wide range of toxic metals is regulated by glutathione S-transferases. Yeast URE2 encodes for a protein that has glutathione peroxidase activity and is homologous to mammalian glutathione S-transferases. The URE2 expression is critical to cell survival under heavy metal stress. Here, we report on the finding of two genes, ITT1, an inhibitor of translation termination, and RPS1A, a small ribosomal protein, that when deleted yeast cells exhibit similar metal sensitivity phenotypes to gene deletion strain for URE2. Neither of these genes were previously linked to metal toxicity. Our gene expression analysis illustrates that these two genes affect URE2 mRNA expression at the level of translation.
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Omidi K, Jessulat M, Hooshyar M, Burnside D, Schoenrock A, Kazmirchuk T, Hajikarimlou M, Daniel M, Moteshareie H, Bhojoo U, Sanders M, Ramotar D, Dehne F, Samanfar B, Babu M, Golshani A. Uncharacterized ORF HUR1 influences the efficiency of non-homologous end-joining repair in Saccharomyces cerevisiae. Gene 2018; 639:128-136. [DOI: 10.1016/j.gene.2017.10.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2017] [Revised: 06/25/2017] [Accepted: 10/02/2017] [Indexed: 01/05/2023]
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Samanfar B, Shostak K, Moteshareie H, Hajikarimlou M, Shaikho S, Omidi K, Hooshyar M, Burnside D, Márquez IG, Kazmirchuk T, Naing T, Ludovico P, York-Lyon A, Szereszewski K, Leung C, Jin JY, Megarbane R, Smith ML, Babu M, Holcik M, Golshani A. The sensitivity of the yeast, Saccharomyces cerevisiae, to acetic acid is influenced by DOM34 and RPL36A. PeerJ 2017; 5:e4037. [PMID: 29158977 PMCID: PMC5691786 DOI: 10.7717/peerj.4037] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2017] [Accepted: 10/24/2017] [Indexed: 12/21/2022] Open
Abstract
The presence of acetic acid during industrial alcohol fermentation reduces the yield of fermentation by imposing additional stress on the yeast cells. The biology of cellular responses to stress has been a subject of vigorous investigations. Although much has been learned, details of some of these responses remain poorly understood. Members of heat shock chaperone HSP proteins have been linked to acetic acid and heat shock stress responses in yeast. Both acetic acid and heat shock have been identified to trigger different cellular responses including reduction of global protein synthesis and induction of programmed cell death. Yeast HSC82 and HSP82 code for two important heat shock proteins that together account for 1–2% of total cellular proteins. Both proteins have been linked to responses to acetic acid and heat shock. In contrast to the overall rate of protein synthesis which is reduced, the expression of HSC82 and HSP82 is induced in response to acetic acid stress. In the current study we identified two yeast genes DOM34 and RPL36A that are linked to acetic acid and heat shock sensitivity. We investigated the influence of these genes on the expression of HSP proteins. Our observations suggest that Dom34 and RPL36A influence translation in a CAP-independent manner.
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Affiliation(s)
- Bahram Samanfar
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, Ontario, Canada.,Agriculture and Ari-Food Canada, Ottawa Research and Development Centre (ORDC), Ottawa, Ontario, Canada
| | - Kristina Shostak
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, Ontario, Canada.,Agriculture and Ari-Food Canada, Ottawa Research and Development Centre (ORDC), Ottawa, Ontario, Canada
| | - Houman Moteshareie
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, Ontario, Canada
| | - Maryam Hajikarimlou
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, Ontario, Canada
| | - Sarah Shaikho
- Children's Hospital of Eastern Ontario Research Institute, Department of Pediatrics , University of Ottawa, Ottawa, Ontario, Canada
| | - Katayoun Omidi
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, Ontario, Canada
| | - Mohsen Hooshyar
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, Ontario, Canada.,Ottawa Hospital Research Institute, Center for Cancer Therapeutics, Ottawa, Ontario, Canada
| | - Daniel Burnside
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, Ontario, Canada
| | - Imelda Galván Márquez
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, Ontario, Canada
| | - Tom Kazmirchuk
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, Ontario, Canada
| | - Thet Naing
- Children's Hospital of Eastern Ontario Research Institute, Department of Pediatrics , University of Ottawa, Ottawa, Ontario, Canada
| | - Paula Ludovico
- Life and Health Sciences Research Institute (ICVS), School of Health Sciences, University of Minho, Portugal
| | - Anna York-Lyon
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, Ontario, Canada
| | - Kama Szereszewski
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, Ontario, Canada.,Department of Chemistry, Carleton University, Ottawa, Ontario, Canada
| | - Cindy Leung
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, Ontario, Canada
| | - Jennifer Yixin Jin
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, Ontario, Canada
| | - Rami Megarbane
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, Ontario, Canada
| | - Myron L Smith
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, Ontario, Canada
| | - Mohan Babu
- Department of Biochemistry, Research and Innovation Centre, University of Regina, Regina, Saskatchewan, Canada
| | - Martin Holcik
- Children's Hospital of Eastern Ontario Research Institute, Department of Pediatrics , University of Ottawa, Ottawa, Ontario, Canada.,Department of Health Sciences, Carleton University, Ottawa, Ontario, Canada
| | - Ashkan Golshani
- Department of Biology and Ottawa Institute of Systems Biology, Carleton University, Ottawa, Ontario, Canada
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OLA1, a Translational Regulator of p21, Maintains Optimal Cell Proliferation Necessary for Developmental Progression. Mol Cell Biol 2016; 36:2568-82. [PMID: 27481995 DOI: 10.1128/mcb.00137-16] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2016] [Accepted: 07/25/2016] [Indexed: 02/07/2023] Open
Abstract
OLA1, an Obg-family GTPase, has been implicated in eukaryotic initiation factor 2 (eIF2)-mediated translational control, but its physiological functions remain obscure. Here we report that mouse embryos lacking OLA1 have stunted growth, delayed development leading to immature organs-especially lungs-at birth, and frequent perinatal lethality. Proliferation of primary Ola1(-/-) mouse embryonic fibroblasts (MEFs) is impaired due to defective cell cycle progression, associated with reduced cyclins D1 and E1, attenuated Rb phosphorylation, and increased p21(Cip1/Waf1) Accumulation of p21 in Ola1(-/-) MEFs is due to enhanced mRNA translation and can be prevented by either reconstitution of OLA1 expression or treatment with an eIF2α dephosphorylation inhibitor, suggesting that OLA1 regulates p21 through a translational mechanism involving eIF2. With immunohistochemistry, overexpression of p21 protein was detected in Ola1-null embryos with reduced cell proliferation. Moreover, we have generated p21(-/-) Ola1(-/-) mice and found that knockout of p21 can partially rescue the growth retardation defect of Ola1(-/-) embryos but fails to rescue them from developmental delay and the lethality. These data demonstrate, for the first time, that OLA1 is required for normal progression of mammalian development. OLA1 plays an important role in promoting cell proliferation at least in part through suppression of p21 and organogenesis via factors yet to be discovered.
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Pelin A, Moteshareie H, Sak B, Selman M, Naor A, Eyahpaise MÈ, Farinelli L, Golshani A, Kvac M, Corradi N. The genome of an Encephalitozoon cuniculi type III strain reveals insights into the genetic diversity and mode of reproduction of a ubiquitous vertebrate pathogen. Heredity (Edinb) 2016; 116:458-65. [PMID: 26837273 DOI: 10.1038/hdy.2016.4] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2015] [Revised: 12/10/2015] [Accepted: 12/18/2015] [Indexed: 02/07/2023] Open
Abstract
Encephalitozoon cuniculi is a model microsporidian species with a mononucleate nucleus and a genome that has been extensively studied. To date, analyses of genome diversity have revealed the existence of four genotypes in E. cuniculi (EcI, II, III and IV). Genome sequences are available for EcI, II and III, and are all very divergent, possibly diploid and genetically homogeneous. The mechanisms that cause low genetic diversity in E. cuniculi (for example, selfing, inbreeding or a combination of both), as well as the degree of genetic variation in their natural populations, have been hard to assess because genome data have been so far gathered from laboratory-propagated strains. In this study, we aim to tackle this issue by analyzing the complete genome sequence of a natural strain of E. cuniculi isolated in 2013 from a steppe lemming. The strain belongs to the EcIII genotype and has been designated EcIII-L. The EcIII-L genome sequence harbors genomic features intermediate to known genomes of II and III lab strains, and we provide primers that differentiate the three E. cuniculi genotypes using a single PCR. Surprisingly, the EcIII-L genome is also highly homogeneous, harbors signatures of heterozygosity and also one strain-specific single-nucleotide polymorphism (SNP) that introduces a stop codon in a key meiosis gene, Spo11. Functional analyses using a heterologous system demonstrate that this SNP leads to a deficient meiosis in a model fungus. This indicates that EcIII-L meiotic machinery may be presently broken. Overall, our findings reveal previously unsuspected genome diversity in E. cuniculi, some of which appears to affect genes of primary importance for the biology of this pathogen.
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Affiliation(s)
- A Pelin
- Department of Biology, Canadian Institute for Advanced Research, University of Ottawa, Ottawa, ON, Canada
| | - H Moteshareie
- Department of Biology, Carleton University, Ottawa, Ontario, Canada.,Ottawa Institute of Systems Biology, Carleton University, Ottawa, Ontario, Canada
| | - B Sak
- Institute of Parasitology, Biology Centre of the Academy of Sciences of the Czech Republic, České Budějovice, Czech Republic
| | - M Selman
- Department of Biology, Canadian Institute for Advanced Research, University of Ottawa, Ottawa, ON, Canada
| | - A Naor
- Department of Biology, Canadian Institute for Advanced Research, University of Ottawa, Ottawa, ON, Canada
| | - M-È Eyahpaise
- Department of Biology, Canadian Institute for Advanced Research, University of Ottawa, Ottawa, ON, Canada
| | - L Farinelli
- FASTERIS S.A., Ch. du Pont-du-Centenaire 109, Plan-les-Ouates, Switzerland
| | - A Golshani
- Department of Biology, Carleton University, Ottawa, Ontario, Canada.,Ottawa Institute of Systems Biology, Carleton University, Ottawa, Ontario, Canada
| | - M Kvac
- Institute of Parasitology, Biology Centre of the Academy of Sciences of the Czech Republic, České Budějovice, Czech Republic
| | - N Corradi
- Department of Biology, Canadian Institute for Advanced Research, University of Ottawa, Ottawa, ON, Canada
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Hannemann L, Suppanz I, Ba Q, MacInnes K, Drepper F, Warscheid B, Koch HG. Redox Activation of the Universally Conserved ATPase YchF by Thioredoxin 1. Antioxid Redox Signal 2016; 24:141-56. [PMID: 26160547 PMCID: PMC4742990 DOI: 10.1089/ars.2015.6272] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
AIMS YchF/Ola1 are unconventional members of the universally conserved GTPase family because they preferentially hydrolyze ATP rather than GTP. These ATPases have been associated with various cellular processes and pathologies, including DNA repair, tumorigenesis, and apoptosis. In particular, a possible role in regulating the oxidative stress response has been suggested for both bacterial and human YchF/Ola1. In this study, we analyzed how YchF responds to oxidative stress and how it potentially regulates the antioxidant response. RESULTS Our data identify a redox-regulated monomer-dimer equilibrium of YchF as a key event in the functional cycle of YchF. Upon oxidative stress, the oxidation of a conserved and surface-exposed cysteine residue promotes YchF dimerization, which is accompanied by inhibition of the ATPase activity. No dimers were observed in a YchF mutant lacking this cysteine. In vitro, the YchF dimer is dissociated by thioredoxin 1 (TrxA) and this stimulates the ATPase activity. The physiological significance of the YchF-thioredoxin 1 interaction was demonstrated by in vivo cross-linking, which validated this interaction in living cells. This approach also revealed that both the ATPase domain and the helical domain of YchF are in contact with TrxA. INNOVATION YchF/Ola1 are the first redox-regulated members of the universally conserved GTPase family and are inactivated by oxidation of a conserved cysteine residue within the nucleotide-binding motif. CONCLUSION Our data provide novel insights into the regulation of the so far ill-defined YchF/Ola1 family of proteins and stipulate their role as negative regulators of the oxidative stress response.
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Affiliation(s)
- Liya Hannemann
- 1 Institut für Biochemie und Molekularbiologie, Albert-Ludwigs-Universität Freiburg , Freiburg, Germany
| | - Ida Suppanz
- 2 Faculty of Biology, Albert-Ludwigs-Universität Freiburg , Freiburg, Germany .,3 BIOSS Centre for Biological Signalling Studies, Albert-Ludwigs-Universität Freiburg , Freiburg, Germany
| | - Qiaorui Ba
- 1 Institut für Biochemie und Molekularbiologie, Albert-Ludwigs-Universität Freiburg , Freiburg, Germany .,2 Faculty of Biology, Albert-Ludwigs-Universität Freiburg , Freiburg, Germany
| | - Katherine MacInnes
- 1 Institut für Biochemie und Molekularbiologie, Albert-Ludwigs-Universität Freiburg , Freiburg, Germany
| | - Friedel Drepper
- 2 Faculty of Biology, Albert-Ludwigs-Universität Freiburg , Freiburg, Germany .,3 BIOSS Centre for Biological Signalling Studies, Albert-Ludwigs-Universität Freiburg , Freiburg, Germany
| | - Bettina Warscheid
- 2 Faculty of Biology, Albert-Ludwigs-Universität Freiburg , Freiburg, Germany .,3 BIOSS Centre for Biological Signalling Studies, Albert-Ludwigs-Universität Freiburg , Freiburg, Germany
| | - Hans-Georg Koch
- 1 Institut für Biochemie und Molekularbiologie, Albert-Ludwigs-Universität Freiburg , Freiburg, Germany
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Wallace EWJ, Kear-Scott JL, Pilipenko EV, Schwartz MH, Laskowski PR, Rojek AE, Katanski CD, Riback JA, Dion MF, Franks AM, Airoldi EM, Pan T, Budnik BA, Drummond DA. Reversible, Specific, Active Aggregates of Endogenous Proteins Assemble upon Heat Stress. Cell 2015; 162:1286-98. [PMID: 26359986 DOI: 10.1016/j.cell.2015.08.041] [Citation(s) in RCA: 327] [Impact Index Per Article: 36.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2015] [Revised: 06/19/2015] [Accepted: 08/05/2015] [Indexed: 01/03/2023]
Abstract
Heat causes protein misfolding and aggregation and, in eukaryotic cells, triggers aggregation of proteins and RNA into stress granules. We have carried out extensive proteomic studies to quantify heat-triggered aggregation and subsequent disaggregation in budding yeast, identifying >170 endogenous proteins aggregating within minutes of heat shock in multiple subcellular compartments. We demonstrate that these aggregated proteins are not misfolded and destined for degradation. Stable-isotope labeling reveals that even severely aggregated endogenous proteins are disaggregated without degradation during recovery from shock, contrasting with the rapid degradation observed for many exogenous thermolabile proteins. Although aggregation likely inactivates many cellular proteins, in the case of a heterotrimeric aminoacyl-tRNA synthetase complex, the aggregated proteins remain active with unaltered fidelity. We propose that most heat-induced aggregation of mature proteins reflects the operation of an adaptive, autoregulatory process of functionally significant aggregate assembly and disassembly that aids cellular adaptation to thermal stress.
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Affiliation(s)
- Edward W J Wallace
- Department of Biochemistry and Molecular Biology, The University of Chicago, 929 East 57(th) Street, Chicago, IL 60637, USA
| | - Jamie L Kear-Scott
- Department of Biochemistry and Molecular Biology, The University of Chicago, 929 East 57(th) Street, Chicago, IL 60637, USA
| | - Evgeny V Pilipenko
- Department of Biochemistry and Molecular Biology, The University of Chicago, 929 East 57(th) Street, Chicago, IL 60637, USA
| | - Michael H Schwartz
- Department of Biochemistry and Molecular Biology, The University of Chicago, 929 East 57(th) Street, Chicago, IL 60637, USA
| | - Pawel R Laskowski
- Department of Biochemistry and Molecular Biology, The University of Chicago, 929 East 57(th) Street, Chicago, IL 60637, USA
| | - Alexandra E Rojek
- Department of Biochemistry and Molecular Biology, The University of Chicago, 929 East 57(th) Street, Chicago, IL 60637, USA; Department of Molecular and Cellular Biology, Harvard University, Cambridge, MA 02138, USA
| | - Christopher D Katanski
- Department of Biochemistry and Molecular Biology, The University of Chicago, 929 East 57(th) Street, Chicago, IL 60637, USA
| | - Joshua A Riback
- Department of Biochemistry and Molecular Biology, The University of Chicago, 929 East 57(th) Street, Chicago, IL 60637, USA
| | - Michael F Dion
- FAS Center for Systems Biology, Harvard University, Cambridge, MA 02138, USA
| | | | - Edoardo M Airoldi
- FAS Center for Systems Biology, Harvard University, Cambridge, MA 02138, USA; Department of Statistics, Harvard University, Cambridge, MA 02138, USA
| | - Tao Pan
- Department of Biochemistry and Molecular Biology, The University of Chicago, 929 East 57(th) Street, Chicago, IL 60637, USA
| | - Bogdan A Budnik
- FAS Center for Systems Biology, Harvard University, Cambridge, MA 02138, USA
| | - D Allan Drummond
- Department of Biochemistry and Molecular Biology, The University of Chicago, 929 East 57(th) Street, Chicago, IL 60637, USA.
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25
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OLA1 regulates protein synthesis and integrated stress response by inhibiting eIF2 ternary complex formation. Sci Rep 2015; 5:13241. [PMID: 26283179 PMCID: PMC4539610 DOI: 10.1038/srep13241] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2015] [Accepted: 07/10/2015] [Indexed: 01/06/2023] Open
Abstract
Translation is a fundamental cellular process, and its dysregulation can contribute to human diseases such as cancer. During translation initiation the eukaryotic initiation factor 2 (eIF2) forms a ternary complex (TC) with GTP and the initiator methionyl-tRNA (tRNAi), mediating ribosomal recruitment of tRNAi. Limiting TC availability is a central mechanism for triggering the integrated stress response (ISR), which suppresses global translation in response to various cellular stresses, but induces specific proteins such as ATF4. This study shows that OLA1, a member of the ancient Obg family of GTPases, is an eIF2-regulatory protein that inhibits protein synthesis and promotes ISR by binding eIF2, hydrolyzing GTP, and interfering with TC formation. OLA1 thus represents a novel mechanism of translational control affecting de novo TC formation, different from the traditional model in which phosphorylation of eIF2α blocks the regeneration of TC. Depletion of OLA1 caused a hypoactive ISR and greater survival in stressed cells. In vivo, OLA1-knockdown rendered cancer cells deficient in ISR and the downstream proapoptotic effector, CHOP, promoting tumor growth and metastasis. Our work suggests that OLA1 is a novel translational GTPase and plays a suppressive role in translation and cell survival, as well as cancer growth and progression.
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