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Sivananthan S, Gosse JT, Huard S, Baetz K. Pab1 acetylation at K131 decreases stress granule formation in Saccharomyces cerevisiae. J Biol Chem 2022; 299:102834. [PMID: 36572187 PMCID: PMC9867979 DOI: 10.1016/j.jbc.2022.102834] [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: 06/21/2022] [Revised: 12/02/2022] [Accepted: 12/05/2022] [Indexed: 12/25/2022] Open
Abstract
Under environmental stress, such as glucose deprivation, cells form stress granules-the accumulation of cytoplasmic aggregates of repressed translational initiation complexes, proteins, and stalled mRNAs. Recent research implicates stress granules in various diseases, such as neurodegenerative diseases, but the exact regulators responsible for the assembly and disassembly of stress granules are unknown. An important aspect of stress granule formation is the presence of posttranslational modifications on core proteins. One of those modifications is lysine acetylation, which is regulated by either a lysine acetyltransferase or a lysine deacetylase enzyme. This work deciphers the impact of lysine acetylation on an essential protein found in Saccharomyces cerevisiae stress granules, poly(A)-binding protein (Pab1). We demonstrated that an acetylation mimic of the lysine residue in position 131 reduces stress granule formation upon glucose deprivation and other stressors such as ethanol, raffinose, and vanillin. We present genetic evidence that the enzyme Rpd3 is the primary candidate for the deacetylation of Pab1-K131. Further, our electromobility shift assay studies suggest that the acetylation of Pab1-K131 negatively impacts poly(A) RNA binding. Due to the conserved nature of stress granules, therapeutics targeting the activity of lysine acetyltransferases and lysine deacetylase enzymes may be a promising route to modulate stress granule dynamics in the disease state.
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Affiliation(s)
- Sangavi Sivananthan
- Ottawa Institute of Systems Biology, Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, Ontario, Canada
| | - Jessica T. Gosse
- Ottawa Institute of Systems Biology, Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, Ontario, Canada
| | - Sylvain Huard
- Ottawa Institute of Systems Biology, Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, Ontario, Canada
| | - Kristin Baetz
- Ottawa Institute of Systems Biology, Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, Ontario, Canada; Department of Biological Sciences, University of Calgary, Calgary, Alberta, Canada.
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Kanda Y, Satoh R, Takasaki T, Tomimoto N, Tsuchiya K, Tsai CA, Tanaka T, Kyomoto S, Hamada K, Fujiwara T, Sugiura R. Sequestration of the PKC ortholog Pck2 in stress granules as a feedback mechanism of MAPK signaling in fission yeast. J Cell Sci 2021; 134:224095. [PMID: 33277379 DOI: 10.1242/jcs.250191] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Accepted: 11/23/2020] [Indexed: 12/22/2022] Open
Abstract
Protein kinase C (PKC) signaling is a highly conserved signaling module that plays a central role in a myriad of physiological processes, ranging from cell proliferation to cell death, via various signaling pathways, including MAPK signaling. Stress granules (SGs) are non-membranous cytoplasmic foci that aggregate in cells exposed to environmental stresses. Here, we explored the role of SGs in PKC/MAPK signaling activation in fission yeast. High-heat stress (HHS) induced Pmk1 MAPK activation and Pck2 translocation from the cell tips into poly(A)-binding protein (Pabp)-positive SGs. Pck2 dispersal from the cell tips required Pck2 kinase activity, and constitutively active Pck2 exhibited increased translocation to SGs. Importantly, Pmk1 deletion impaired Pck2 recruitment to SGs, indicating that MAPK activation stimulates Pck2 SG translocation. Consistently, HHS-induced SGs delayed Pck2 relocalization at the cell tips, thereby blocking subsequent Pmk1 reactivation after recovery from HHS. HHS partitioned Pck2 into the Pabp-positive SG-containing fraction, which resulted in reduced Pck2 abundance and kinase activity in the soluble fraction. Taken together, these results indicate that MAPK-dependent Pck2 SG recruitment serves as a feedback mechanism to intercept PKC/MAPK activation induced by HHS, which might underlie PKC-related diseases.
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Affiliation(s)
- Yuki Kanda
- Laboratory of Molecular Pharmacogenomics, Department of Pharmaceutical Sciences, Faculty of Pharmacy, Kindai University, Osaka 577-8502, Japan
| | - Ryosuke Satoh
- Laboratory of Molecular Pharmacogenomics, Department of Pharmaceutical Sciences, Faculty of Pharmacy, Kindai University, Osaka 577-8502, Japan
| | - Teruaki Takasaki
- Laboratory of Molecular Pharmacogenomics, Department of Pharmaceutical Sciences, Faculty of Pharmacy, Kindai University, Osaka 577-8502, Japan
| | - Naofumi Tomimoto
- Laboratory of Molecular Pharmacogenomics, Department of Pharmaceutical Sciences, Faculty of Pharmacy, Kindai University, Osaka 577-8502, Japan
| | - Kiko Tsuchiya
- Laboratory of Molecular Pharmacogenomics, Department of Pharmaceutical Sciences, Faculty of Pharmacy, Kindai University, Osaka 577-8502, Japan
| | - Chun An Tsai
- Laboratory of Molecular Pharmacogenomics, Department of Pharmaceutical Sciences, Faculty of Pharmacy, Kindai University, Osaka 577-8502, Japan
| | - Taemi Tanaka
- Laboratory of Molecular Pharmacogenomics, Department of Pharmaceutical Sciences, Faculty of Pharmacy, Kindai University, Osaka 577-8502, Japan
| | - Shu Kyomoto
- Laboratory of Molecular Pharmacogenomics, Department of Pharmaceutical Sciences, Faculty of Pharmacy, Kindai University, Osaka 577-8502, Japan
| | - Kozo Hamada
- Laboratory of Molecular Pharmacogenomics, Department of Pharmaceutical Sciences, Faculty of Pharmacy, Kindai University, Osaka 577-8502, Japan
| | - Toshinobu Fujiwara
- Laboratory of Biochemistry, Department of Pharmacy, Faculty of Pharmacy, Kindai University, Osaka 577-8502, Japan
| | - Reiko Sugiura
- Laboratory of Molecular Pharmacogenomics, Department of Pharmaceutical Sciences, Faculty of Pharmacy, Kindai University, Osaka 577-8502, Japan
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Kanodia P, Vijayapalani P, Srivastava R, Bi R, Liu P, Miller WA, Howell SH. Control of translation during the unfolded protein response in maize seedlings: Life without PERKs. PLANT DIRECT 2020; 4:e00241. [PMID: 32743235 PMCID: PMC7390965 DOI: 10.1002/pld3.241] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Accepted: 06/17/2020] [Indexed: 05/05/2023]
Abstract
The accumulation of misfolded proteins in the endoplasmic reticulum (ER) defines a condition called ER stress that induces the unfolded protein response (UPR). The UPR in mammalian cells attenuates protein synthesis initiation, which prevents the piling up of misfolded proteins in the ER. Mammalian cells rely on Protein Kinase RNA-Like Endoplasmic Reticulum Kinase (PERK) phosphorylation of eIF2α to arrest protein synthesis, however, plants do not have a PERK homolog, so the question is whether plants control translation in response to ER stress. We compared changes in RNA levels in the transcriptome to the RNA levels protected by ribosomes and found a decline in translation efficiency, including many UPR genes, in response to ER stress. The decline in translation efficiency is due to the fact that many mRNAs are not loaded onto polyribosomes (polysomes) in proportion to their increase in total RNA, instead some of the transcripts accumulate in stress granules (SGs). The RNAs that populate SGs are not derived from the disassembly of polysomes because protein synthesis remains steady during stress. Thus, the surge in transcription of UPR genes in response to ER stress is accompanied by the formation of SGs, and the sequestration of mRNAs in SGs may serve to temporarily relieve the translation load during ER stress.
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Affiliation(s)
- Pulkit Kanodia
- Plant Pathology and Microbiology DepartmentIowa State UniversityAmesIAUSA
- Interdepartmental Genetics and Genomics MajorIowa State UniversityAmesIAUSA
| | | | | | - Ran Bi
- Statistics DepartmentIowa State UniversityAmesIAUSA
| | - Peng Liu
- Plant Science InstituteIowa State UniversityAmesIAUSA
- Statistics DepartmentIowa State UniversityAmesIAUSA
| | - W. Allen Miller
- Plant Pathology and Microbiology DepartmentIowa State UniversityAmesIAUSA
- Interdepartmental Genetics and Genomics MajorIowa State UniversityAmesIAUSA
- Plant Science InstituteIowa State UniversityAmesIAUSA
| | - Stephen H. Howell
- Interdepartmental Genetics and Genomics MajorIowa State UniversityAmesIAUSA
- Plant Science InstituteIowa State UniversityAmesIAUSA
- Genetics, Development and Cell Biology DepartmentIowa State UniversityAmesIAUSA
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4
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Brambilla M, Martani F, Bertacchi S, Vitangeli I, Branduardi P. The Saccharomyces cerevisiae
poly (A) binding protein (Pab1): Master regulator of mRNA metabolism and cell physiology. Yeast 2018; 36:23-34. [DOI: 10.1002/yea.3347] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2017] [Revised: 06/26/2018] [Accepted: 07/06/2018] [Indexed: 12/15/2022] Open
Affiliation(s)
- Marco Brambilla
- Department of Biotechnology and Biosciences; University of Milano-Bicocca; Piazza della Scienza 2 20126 Milan Italy
| | - Francesca Martani
- Department of Biotechnology and Biosciences; University of Milano-Bicocca; Piazza della Scienza 2 20126 Milan Italy
| | - Stefano Bertacchi
- Department of Biotechnology and Biosciences; University of Milano-Bicocca; Piazza della Scienza 2 20126 Milan Italy
| | - Ilaria Vitangeli
- Department of Biotechnology and Biosciences; University of Milano-Bicocca; Piazza della Scienza 2 20126 Milan Italy
| | - Paola Branduardi
- Department of Biotechnology and Biosciences; University of Milano-Bicocca; Piazza della Scienza 2 20126 Milan Italy
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5
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Falcone C, Mazzoni C. RNA stability and metabolism in regulated cell death, aging and diseases. FEMS Yeast Res 2018; 18:4978431. [DOI: 10.1093/femsyr/foy050] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2018] [Accepted: 04/17/2018] [Indexed: 12/13/2022] Open
Affiliation(s)
- Claudio Falcone
- Pasteur Institute-Cenci Bolognetti Foundation, Department of Biology and Biotechnology “Charles Darwin”, Sapienza University of Rome, Piazzale Aldo Moro 5, 00185-Rome, Italy
| | - Cristina Mazzoni
- Pasteur Institute-Cenci Bolognetti Foundation, Department of Biology and Biotechnology “Charles Darwin”, Sapienza University of Rome, Piazzale Aldo Moro 5, 00185-Rome, Italy
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