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Yin X, Zhang K, Wang J, Zhou X, Zhang C, Song X, Wu Z, Du J, Chen Q, Zhang S, Deng W. RNA polymerase I subunit 12 plays opposite roles in cell proliferation and migration. Biochem Biophys Res Commun 2021; 560:112-118. [PMID: 33984768 DOI: 10.1016/j.bbrc.2021.04.091] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2021] [Accepted: 04/20/2021] [Indexed: 11/29/2022]
Abstract
RNA polymerase I (Pol I) is responsible for the synthesis of the majority of ribosomal RNA molecules in eukaryotes. Pol I subunit 12 (RPA12) is involved in the transcriptional termination and lipid metabolism in yeast. However, its role in human cells hasn't been investigated so far. Here, we show that RPA12 is present in the nucleolus and nucleoplasm of HeLa cells. RPA12 can act as a positive factor to regulate Pol I-mediated transcription and the proliferation of 293T and HeLa cells. Unexpectedly, RPA12 can repress HeLa cell migration, indicating that RPA12 plays opposite roles in cell proliferation and migration. This study provides a novel insight into the role of RPA12 in human cells.
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Affiliation(s)
- Xiaomei Yin
- College of Life Science and Health, Wuhan University of Science and Technology, Wuhan, 430065, China
| | - Kewei Zhang
- College of Life Science and Health, Wuhan University of Science and Technology, Wuhan, 430065, China
| | - Juan Wang
- College of Life Science and Health, Wuhan University of Science and Technology, Wuhan, 430065, China; School of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, China
| | - Xiangyu Zhou
- College of Life Science and Health, Wuhan University of Science and Technology, Wuhan, 430065, China
| | - Cheng Zhang
- College of Life Science and Health, Wuhan University of Science and Technology, Wuhan, 430065, China
| | - Xiaoye Song
- College of Life Science and Health, Wuhan University of Science and Technology, Wuhan, 430065, China
| | - Zhongyu Wu
- College of Life Science and Health, Wuhan University of Science and Technology, Wuhan, 430065, China
| | - Jiannan Du
- College of Life Science and Health, Wuhan University of Science and Technology, Wuhan, 430065, China
| | - Qiyue Chen
- College of Life Science and Health, Wuhan University of Science and Technology, Wuhan, 430065, China
| | - Shihua Zhang
- College of Life Science and Health, Wuhan University of Science and Technology, Wuhan, 430065, China.
| | - Wensheng Deng
- College of Life Science and Health, Wuhan University of Science and Technology, Wuhan, 430065, China.
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Rajvanshi PK, Arya M, Rajasekharan R. The stress-regulatory transcription factors Msn2 and Msn4 regulate fatty acid oxidation in budding yeast. J Biol Chem 2017; 292:18628-18643. [PMID: 28924051 DOI: 10.1074/jbc.m117.801704] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2017] [Revised: 09/12/2017] [Indexed: 11/06/2022] Open
Abstract
The transcription factors Msn2 and Msn4 (multicopy suppressor of SNF1 mutation proteins 2 and 4) bind the stress-response element in gene promoters in the yeast Saccharomyces cerevisiae However, the roles of Msn2/4 in primary metabolic pathways such as fatty acid β-oxidation are unclear. Here, in silico analysis revealed that the promoters of most genes involved in the biogenesis, function, and regulation of the peroxisome contain Msn2/4-binding sites. We also found that transcript levels of MSN2/MSN4 are increased in glucose-depletion conditions and that during growth in nonpreferred carbon sources, Msn2 is constantly localized to the nucleus in wild-type cells. Of note, the double mutant msn2Δmsn4Δ exhibited a severe growth defect when grown with oleic acid as the sole carbon source and had reduced transcript levels of major β-oxidation genes. ChIP indicated that Msn2 has increased occupancy on the promoters of β-oxidation genes in glucose-depleted conditions, and in vivo reporter gene analysis indicated reduced expression of these genes in msn2Δmsn4Δ cells. Moreover, mobility shift assays revealed that Msn4 binds β-oxidation gene promoters. Immunofluorescence microscopy with anti-peroxisome membrane protein antibodies disclosed that the msn2Δmsn4Δ strain had fewer peroxisomes than the wild type, and lipid analysis indicated that the msn2Δmsn4Δ strain had increased triacylglycerol and steryl ester levels. Collectively, our data suggest that Msn2/Msn4 transcription factors activate expression of the genes involved in fatty acid oxidation. Because glucose sensing, signaling, and fatty acid β-oxidation pathways are evolutionarily conserved throughout eukaryotes, the msn2Δmsn4Δ strain could therefore be a good model system for further study of these critical processes.
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Affiliation(s)
- Praveen Kumar Rajvanshi
- From the Department of Lipid Science of the Lipidomic Centre and.,the Academy of Scientific and Innovative Research, Council of Scientific and Industrial Research-Central Food Technological Research Institute, Mysuru 570020, Karnataka, India
| | - Madhuri Arya
- From the Department of Lipid Science of the Lipidomic Centre and.,the Academy of Scientific and Innovative Research, Council of Scientific and Industrial Research-Central Food Technological Research Institute, Mysuru 570020, Karnataka, India
| | - Ram Rajasekharan
- From the Department of Lipid Science of the Lipidomic Centre and .,the Academy of Scientific and Innovative Research, Council of Scientific and Industrial Research-Central Food Technological Research Institute, Mysuru 570020, Karnataka, India
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Singh N, Yadav KK, Rajasekharan R. Effect of zinc deprivation on the lipid metabolism of budding yeast. Curr Genet 2017; 63:977-982. [PMID: 28500379 DOI: 10.1007/s00294-017-0704-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2017] [Revised: 05/04/2017] [Accepted: 05/07/2017] [Indexed: 12/21/2022]
Abstract
Zinc is an essential micronutrient for all living cells. It serves as a structural and catalytic cofactor for numerous proteins, hence maintaining a proper level of cellular zinc is essential for normal functioning of the cell. Zinc homeostasis is sustained through various ways under severe zinc-deficient conditions. Zinc-dependent proteins play an important role in biological systems and limitation of zinc causes a drastic change in their expression. In budding yeast, a zinc-responsive transcription factor Zap1p controls the expression of genes required for uptake and mobilization of zinc under zinc-limiting conditions. It also regulates the polar lipid levels under zinc-limiting conditions to maintain membrane integrity. Deletion of ZAP1 causes an increase in triacylglyerol levels which is due to the increased biosynthesis of acetate that serves as a precursor for triacylglycerol biosynthesis. In this review, we expanded our recent work role of Zap1p in nonpolar lipid metabolism of budding yeast.
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Affiliation(s)
- Neelima Singh
- Department of Lipid Science, Council of Scientific and Industrial Research (CSIR), Central Food Technological Research Institute (CFTRI), Mysore, 570020, Karnataka, India
| | - Kamlesh Kumar Yadav
- Department of Lipid Science, Council of Scientific and Industrial Research (CSIR), Central Food Technological Research Institute (CFTRI), Mysore, 570020, Karnataka, India
| | - Ram Rajasekharan
- Department of Lipid Science, Council of Scientific and Industrial Research (CSIR), Central Food Technological Research Institute (CFTRI), Mysore, 570020, Karnataka, India.
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