1
|
Murdoch E, Schweizer LM, Schweizer M. Hypothesis: evidence that the PRS gene products of Saccharomyces cerevisiae support both PRPP synthesis and maintenance of cell wall integrity. Curr Genet 2024; 70:6. [PMID: 38733432 PMCID: PMC11088543 DOI: 10.1007/s00294-024-01290-w] [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] [Received: 09/22/2023] [Revised: 01/26/2024] [Accepted: 04/16/2024] [Indexed: 05/13/2024]
Abstract
The gene products of PRS1-PRS5 in Saccharomyces cerevisiae are responsible for the production of PRPP (5-phospho-D-ribosyl-α-1-pyrophosphate). However, it has been demonstrated that they are also involved in the cell wall integrity (CWI) signalling pathway as shown by protein-protein interactions (PPIs) with, for example Slt2, the MAP kinase of the CWI pathway. The following databases: SGD, BioGRID and Hit Predict, which collate PPIs from various research papers, have been scrutinized for evidence of PPIs between Prs1-Prs5 and components of the CWI pathway. The level of certainty in PPIs was verified by interaction scores available in the Hit Predict database revealing that well-documented interactions correspond with higher interaction scores and can be graded as high confidence interactions based on a score > 0.28, an annotation score ≥ 0.5 and a method-based high confidence score level of ≥ 0.485. Each of the Prs1-Prs5 polypeptides shows some degree of interaction with the CWI pathway. However, Prs5 has a vital role in the expression of FKS2 and Rlm1, previously only documented by reporter assay studies. This report emphasizes the importance of investigating interactions using more than one approach since every method has its limitations and the use of different methods, as described herein, provides complementary experimental and statistical data, thereby corroborating PPIs. Since the experimental data described so far are consistent with a link between PRPP synthetase and the CWI pathway, our aim was to demonstrate that these data are also supported by high-throughput bioinformatic analyses promoting our hypothesis that two of the five PRS-encoding genes contain information required for the maintenance of CWI by combining data from our targeted approach with relevant, unbiased data from high-throughput analyses.
Collapse
Affiliation(s)
- Emily Murdoch
- School of Energy, Geoscience, Infrastructure and Society, Institute of Life and Earth Sciences, Energy, Geoscience, Infrastructure and Society, Riccarton Campus, Edinburgh, EH14 4AS, UK
| | | | - Michael Schweizer
- School of Engineering and Physical Sciences, Institute of Biological Chemistry, Biophysics and Bioengineering, Heriot Watt University, Riccarton Campus, Edinburgh, EH14 4AS, UK.
| |
Collapse
|
2
|
Çetin H, Çakar ZP, Ülgen KO. Understanding the adaptive laboratory evolution of multiple stress‐resistant yeast strains by genome scale modeling. Yeast 2022; 39:449-465. [DOI: 10.1002/yea.3806] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2022] [Accepted: 06/24/2022] [Indexed: 11/06/2022] Open
Affiliation(s)
- Handan Çetin
- Department of Computational Science and EngineeringBogazici UniversityIstanbulTurkey
| | - Zeynep Petek Çakar
- Department of Molecular Biology and GeneticsIstanbul Technical UniversityIstanbulTurkey
| | - Kutlu O. Ülgen
- Department of Computational Science and EngineeringBogazici UniversityIstanbulTurkey
- Department of Chemical EngineeringBogazici UniversityIstanbulTurkey
| |
Collapse
|
3
|
Ugbogu EA, Schweizer LM, Schweizer M. Contribution of Model Organisms to Investigating the Far-Reaching Consequences of PRPP Metabolism on Human Health and Well-Being. Cells 2022; 11:1909. [PMID: 35741038 PMCID: PMC9221600 DOI: 10.3390/cells11121909] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Revised: 05/03/2022] [Accepted: 05/05/2022] [Indexed: 11/17/2022] Open
Abstract
Phosphoribosyl pyrophosphate synthetase (PRS EC 2.7.6.1) is a rate-limiting enzyme that irreversibly catalyzes the formation of phosphoribosyl pyrophosphate (PRPP) from ribose-5-phosphate and adenosine triphosphate (ATP). This key metabolite is required for the synthesis of purine and pyrimidine nucleotides, the two aromatic amino acids histidine and tryptophan, the cofactors nicotinamide adenine dinucleotide (NAD+) and nicotinamide adenine dinucleotide phosphate (NADP+), all of which are essential for various life processes. Despite its ubiquity and essential nature across the plant and animal kingdoms, PRPP synthetase displays species-specific characteristics regarding the number of gene copies and architecture permitting interaction with other areas of cellular metabolism. The impact of mutated PRS genes in the model eukaryote Saccharomyces cerevisiae on cell signalling and metabolism may be relevant to the human neuropathies associated with PRPS mutations. Human PRPS1 and PRPS2 gene products are implicated in drug resistance associated with recurrent acute lymphoblastic leukaemia and progression of colorectal cancer and hepatocellular carcinoma. The investigation of PRPP metabolism in accepted model organisms, e.g., yeast and zebrafish, has the potential to reveal novel drug targets for treating at least some of the diseases, often characterized by overlapping symptoms, such as Arts syndrome and respiratory infections, and uncover the significance and relevance of human PRPS in disease diagnosis, management, and treatment.
Collapse
Affiliation(s)
- Eziuche A. Ugbogu
- School of Life Sciences, Heriot Watt University, Edinburgh EH14 4AS, UK; (E.A.U.); (L.M.S.)
| | - Lilian M. Schweizer
- School of Life Sciences, Heriot Watt University, Edinburgh EH14 4AS, UK; (E.A.U.); (L.M.S.)
| | - Michael Schweizer
- Institute of Biological Chemistry, Biophysics & Engineering (IB3), School of Engineering &Physical Sciences, Heriot Watt University, Edinburgh EH14 4AS, UK
| |
Collapse
|
4
|
Sauvaget M, Hutton F, Coull R, Vavassori S, Wang K, Reznik A, Chyker T, Newfield CG, Euston E, Benary G, Schweizer LM, Schweizer M. The NHR1-1 of Prs1 and the pentameric motif 284KKCPK288 of Prs3 permit multi-functionality of the PRPP synthetase in Saccharomyces cerevisiae. FEMS Yeast Res 2019; 19:5288342. [PMID: 30649305 DOI: 10.1093/femsyr/foz006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Accepted: 01/10/2019] [Indexed: 12/23/2022] Open
Abstract
The five-membered PRS gene family of Saccharomyces cerevisiae is an example of gene duplication allowing the acquisition of novel functions. Each of the five Prs polypeptides is theoretically capable of synthesising PRPP but at least one of the following heterodimers is required for survival: Prs1/Prs3, Prs2/Prs5 and Prs4/Prs5. Prs3 contains a pentameric motif 284KKCPK288 found only in nuclear proteins. Deletion of 284KKCPK288 destabilises the Prs1/Prs3 complex resulting in a cascade of events, including reduction in PRPP synthetase activity and altered cell wall integrity (CWI) as measured by caffeine sensitivity and Rlm1 expression. Prs3 also interacts with the kinetochore-associated protein, Nuf2. Following the possibility of 284KKCPK288-mediated transport of the Prs1/Prs3 complex to the nucleus, it may interact with Nuf2 and phosphorylated Slt2 permitting activation of Rlm1. This scenario explains the breakdown of CWI encountered in mutants lacking PRS3 or deleted for 284KKCPK288. However, removal of NHR1-1 from Prs1 does not disrupt the Prs1/Prs3 interaction as shown by increased PRPP synthetase activity. This is evidence for the separation of the two metabolic functions of the PRPP-synthesising machinery: provision of PRPP and maintenance of CWI and is an example of evolutionary development when multiple copies of a gene were present in the ancestral organism.
Collapse
Affiliation(s)
- Maëlle Sauvaget
- Institute of Biological Chemistry, Biophysics & Bioengineering (IB3), School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, Edinburgh EH14 4AS, UK
| | - Fraser Hutton
- Institute of Life & Earth Sciences, School of Energy, Geoscience, Infrastructure & Society, Heriot-Watt University, Edinburgh, Edinburgh EH14 4AS, UK
| | - Robert Coull
- Institute of Life & Earth Sciences, School of Energy, Geoscience, Infrastructure & Society, Heriot-Watt University, Edinburgh, Edinburgh EH14 4AS, UK
| | - Stefano Vavassori
- Institute of Biological Chemistry, Biophysics & Bioengineering (IB3), School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, Edinburgh EH14 4AS, UK
| | - Ke Wang
- School of Life Sciences, Heriot-Watt University, Edinburgh, Edinburgh EH14 4AS, UK
| | - Aleksandra Reznik
- School of Life Sciences, Heriot-Watt University, Edinburgh, Edinburgh EH14 4AS, UK
| | - Tatsiana Chyker
- School of Life Sciences, Heriot-Watt University, Edinburgh, Edinburgh EH14 4AS, UK
| | - Chelsea G Newfield
- Institute of Life & Earth Sciences, School of Energy, Geoscience, Infrastructure & Society, Heriot-Watt University, Edinburgh, Edinburgh EH14 4AS, UK
| | - Eloise Euston
- Institute of Biological Chemistry, Biophysics & Bioengineering (IB3), School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, Edinburgh EH14 4AS, UK
| | - Gerrit Benary
- Institute of Biological Chemistry, Biophysics & Bioengineering (IB3), School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, Edinburgh EH14 4AS, UK
| | - Lilian M Schweizer
- School of Life Sciences, Heriot-Watt University, Edinburgh, Edinburgh EH14 4AS, UK
| | - Michael Schweizer
- Institute of Biological Chemistry, Biophysics & Bioengineering (IB3), School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, Edinburgh EH14 4AS, UK
| |
Collapse
|
5
|
Jiang P, Wei WF, Zhong GW, Zhou XG, Qiao WR, Fisher R, Lu L. The function of the three phosphoribosyl pyrophosphate synthetase (Prs) genes in hyphal growth and conidiation in Aspergillus nidulans. MICROBIOLOGY-SGM 2017; 163:218-232. [PMID: 28277197 DOI: 10.1099/mic.0.000427] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Phosphoribosyl pyrophosphate synthetase, which is encoded by the Prs gene, catalyses the reaction of ribose-5-phosphate and adenine ribonucleotide triphosphate (ATP) and has central importance in cellular metabolism. However, knowledge about how Prs family members function and contribute to total 5-phosphoribosyl-α-1-pyrophosphate (PRPP) synthetase activity is limited. In this study, we identified that the filamentous fungus Aspergillus nidulans genome contains three PRPP synthase-homologous genes (AnprsA, AnprsB and AnprsC), among which AnprsB and AnprsC but not AnprsA are auxotrophic genes. Transcriptional expression profiles revealed that the mRNA levels of AnprsA, AnprsB and AnprsC are dynamic during germination, hyphal growth and sporulation and that they all showed abundant expression during the vigorous hyphal growth time point. Inhibiting the expression of AnprsB or AnprsC in conditional strains produced more effects on the total PRPP synthetase activity than did inhibiting AnprsA, thus indicating that different AnPrs proteins are unequal in their contributions to Prs enzyme activity. In addition, the constitutive overexpression of AnprsA or AnprsC could significantly rescue the defective phenotype of the AnprsB-absent strain, suggesting that the function of AnprsB is not a specific consequence of this auxotrophic gene but instead comes from the contribution of Prs proteins to PRPP synthetase activity.
Collapse
Affiliation(s)
- Ping Jiang
- Jiangsu Key Laboratory for Microbes and Functional Genomics, Jiangsu Engineering and Technology Research Center for Microbiology, College of Life Sciences, Nanjing Normal University, Nanjing 210023, PR China
| | - Wen-Fan Wei
- Jiangsu Key Laboratory for Microbes and Functional Genomics, Jiangsu Engineering and Technology Research Center for Microbiology, College of Life Sciences, Nanjing Normal University, Nanjing 210023, PR China
| | - Guo-Wei Zhong
- Department of Hygiene Analysis and Detection, School of Public Health, Nanjing Medical University, Nanjing 211166, PR China
| | - Xiao-Gang Zhou
- Jiangsu Key Laboratory for Microbes and Functional Genomics, Jiangsu Engineering and Technology Research Center for Microbiology, College of Life Sciences, Nanjing Normal University, Nanjing 210023, PR China
| | - Wei-Ran Qiao
- Jiangsu Key Laboratory for Microbes and Functional Genomics, Jiangsu Engineering and Technology Research Center for Microbiology, College of Life Sciences, Nanjing Normal University, Nanjing 210023, PR China
| | - Reinhard Fisher
- Department of Microbiology, Karlsruhe Institute of Technology (KIT) - South Campus Institute for Applied Biosciences, Karlsruhe, Germany
| | - Ling Lu
- Jiangsu Key Laboratory for Microbes and Functional Genomics, Jiangsu Engineering and Technology Research Center for Microbiology, College of Life Sciences, Nanjing Normal University, Nanjing 210023, PR China
| |
Collapse
|
6
|
Phosphoribosyl Diphosphate (PRPP): Biosynthesis, Enzymology, Utilization, and Metabolic Significance. Microbiol Mol Biol Rev 2016; 81:81/1/e00040-16. [PMID: 28031352 DOI: 10.1128/mmbr.00040-16] [Citation(s) in RCA: 117] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Phosphoribosyl diphosphate (PRPP) is an important intermediate in cellular metabolism. PRPP is synthesized by PRPP synthase, as follows: ribose 5-phosphate + ATP → PRPP + AMP. PRPP is ubiquitously found in living organisms and is used in substitution reactions with the formation of glycosidic bonds. PRPP is utilized in the biosynthesis of purine and pyrimidine nucleotides, the amino acids histidine and tryptophan, the cofactors NAD and tetrahydromethanopterin, arabinosyl monophosphodecaprenol, and certain aminoglycoside antibiotics. The participation of PRPP in each of these metabolic pathways is reviewed. Central to the metabolism of PRPP is PRPP synthase, which has been studied from all kingdoms of life by classical mechanistic procedures. The results of these analyses are unified with recent progress in molecular enzymology and the elucidation of the three-dimensional structures of PRPP synthases from eubacteria, archaea, and humans. The structures and mechanisms of catalysis of the five diphosphoryltransferases are compared, as are those of selected enzymes of diphosphoryl transfer, phosphoryl transfer, and nucleotidyl transfer reactions. PRPP is used as a substrate by a large number phosphoribosyltransferases. The protein structures and reaction mechanisms of these phosphoribosyltransferases vary and demonstrate the versatility of PRPP as an intermediate in cellular physiology. PRPP synthases appear to have originated from a phosphoribosyltransferase during evolution, as demonstrated by phylogenetic analysis. PRPP, furthermore, is an effector molecule of purine and pyrimidine nucleotide biosynthesis, either by binding to PurR or PyrR regulatory proteins or as an allosteric activator of carbamoylphosphate synthetase. Genetic analyses have disclosed a number of mutants altered in the PRPP synthase-specifying genes in humans as well as bacterial species.
Collapse
|
7
|
Ugbogu EA, Wang K, Schweizer LM, Schweizer M. Metabolic gene products have evolved to interact with the cell wall integrity pathway inSaccharomyces cerevisiae. FEMS Yeast Res 2016; 16:fow092. [DOI: 10.1093/femsyr/fow092] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/13/2016] [Indexed: 12/19/2022] Open
|
8
|
Ugbogu EA, Wippler S, Euston M, Kouwenhoven EN, de Brouwer AP, Schweizer LM, Schweizer M. The contribution of the nonhomologous region of Prs1 to the maintenance of cell wall integrity and cell viability. FEMS Yeast Res 2013; 13:291-301. [DOI: 10.1111/1567-1364.12033] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2012] [Revised: 01/28/2013] [Accepted: 01/28/2013] [Indexed: 11/29/2022] Open
Affiliation(s)
| | - Sonja Wippler
- School of Life Sciences; Heriot-Watt University; Edinburgh; UK
| | - Matthew Euston
- School of Life Sciences; Heriot-Watt University; Edinburgh; UK
| | - Evelyn N. Kouwenhoven
- Department of Human Genetics; Nijmegen Centre for Molecular Sciences and Institute of Genetics and Metabolic Diseases; Radboud University Nijmegen Medical Centre; Nijmegen; The Netherlands
| | - Arjan P.M. de Brouwer
- Department of Human Genetics; Nijmegen Centre for Molecular Sciences and Institute of Genetics and Metabolic Diseases; Radboud University Nijmegen Medical Centre; Nijmegen; The Netherlands
| | | | | |
Collapse
|
9
|
Breda A, Martinelli LKB, Bizarro CV, Rosado LA, Borges CB, Santos DS, Basso LA. Wild-type phosphoribosylpyrophosphate synthase (PRS) from Mycobacterium tuberculosis: a bacterial class II PRS? PLoS One 2012; 7:e39245. [PMID: 22745722 PMCID: PMC3380012 DOI: 10.1371/journal.pone.0039245] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2012] [Accepted: 05/22/2012] [Indexed: 11/18/2022] Open
Abstract
The 5-phospho-α-D-ribose 1-diphosphate (PRPP) metabolite plays essential roles in several biosynthetic pathways, including histidine, tryptophan, nucleotides, and, in mycobacteria, cell wall precursors. PRPP is synthesized from α-D-ribose 5-phosphate (R5P) and ATP by the Mycobacterium tuberculosis prsA gene product, phosphoribosylpyrophosphate synthase (MtPRS). Here, we report amplification, cloning, expression and purification of wild-type MtPRS. Glutaraldehyde cross-linking results suggest that MtPRS predominates as a hexamer, presenting varied oligomeric states due to distinct ligand binding. MtPRS activity measurements were carried out by a novel coupled continuous spectrophotometric assay. MtPRS enzyme activity could be detected in the absence of Pi. ADP, GDP and UMP inhibit MtPRS activity. Steady-state kinetics results indicate that MtPRS has broad substrate specificity, being able to accept ATP, GTP, CTP, and UTP as diphosphoryl group donors. Fluorescence spectroscopy data suggest that the enzyme mechanism for purine diphosphoryl donors follows a random order of substrate addition, and for pyrimidine diphosphoryl donors follows an ordered mechanism of substrate addition in which R5P binds first to free enzyme. An ordered mechanism for product dissociation is followed by MtPRS, in which PRPP is the first product to be released followed by the nucleoside monophosphate products to yield free enzyme for the next round of catalysis. The broad specificity for diphosphoryl group donors and detection of enzyme activity in the absence of Pi would suggest that MtPRS belongs to Class II PRS proteins. On the other hand, the hexameric quaternary structure and allosteric ADP inhibition would place MtPRS in Class I PRSs. Further data are needed to classify MtPRS as belonging to a particular family of PRS proteins. The data here presented should help augment our understanding of MtPRS mode of action. Current efforts are toward experimental structure determination of MtPRS to provide a solid foundation for the rational design of specific inhibitors of this enzyme.
Collapse
Affiliation(s)
- Ardala Breda
- Instituto Nacional de Ciência e Tecnologia em Tuberculose (INCT-TB), Centro de Pesquisas em Biologia Molecular e Funcional (CPBMF), Programa de Pós-Graduação em Biologia Celular e Molecular, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Porto Alegre, Rio Grande do Sul, Brazil
- Programa de Pós-Graduação em Biologia Celular e Molecular, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Porto Alegre, Rio Grande do Sul, Brazil
| | - Leonardo K. B. Martinelli
- Instituto Nacional de Ciência e Tecnologia em Tuberculose (INCT-TB), Centro de Pesquisas em Biologia Molecular e Funcional (CPBMF), Programa de Pós-Graduação em Biologia Celular e Molecular, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Porto Alegre, Rio Grande do Sul, Brazil
- Programa de Pós-Graduação em Biologia Celular e Molecular, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Porto Alegre, Rio Grande do Sul, Brazil
| | - Cristiano V. Bizarro
- Instituto Nacional de Ciência e Tecnologia em Tuberculose (INCT-TB), Centro de Pesquisas em Biologia Molecular e Funcional (CPBMF), Programa de Pós-Graduação em Biologia Celular e Molecular, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Porto Alegre, Rio Grande do Sul, Brazil
| | - Leonardo A. Rosado
- Instituto Nacional de Ciência e Tecnologia em Tuberculose (INCT-TB), Centro de Pesquisas em Biologia Molecular e Funcional (CPBMF), Programa de Pós-Graduação em Biologia Celular e Molecular, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Porto Alegre, Rio Grande do Sul, Brazil
- Programa de Pós-Graduação em Biologia Celular e Molecular, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Porto Alegre, Rio Grande do Sul, Brazil
| | - Caroline B. Borges
- Instituto Nacional de Ciência e Tecnologia em Tuberculose (INCT-TB), Centro de Pesquisas em Biologia Molecular e Funcional (CPBMF), Programa de Pós-Graduação em Biologia Celular e Molecular, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Porto Alegre, Rio Grande do Sul, Brazil
- Programa de Pós-Graduação em Biologia Celular e Molecular, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Porto Alegre, Rio Grande do Sul, Brazil
| | - Diógenes S. Santos
- Instituto Nacional de Ciência e Tecnologia em Tuberculose (INCT-TB), Centro de Pesquisas em Biologia Molecular e Funcional (CPBMF), Programa de Pós-Graduação em Biologia Celular e Molecular, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Porto Alegre, Rio Grande do Sul, Brazil
- Programa de Pós-Graduação em Biologia Celular e Molecular, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Porto Alegre, Rio Grande do Sul, Brazil
- * E-mail: (LB); (DSS)
| | - Luiz A. Basso
- Instituto Nacional de Ciência e Tecnologia em Tuberculose (INCT-TB), Centro de Pesquisas em Biologia Molecular e Funcional (CPBMF), Programa de Pós-Graduação em Biologia Celular e Molecular, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Porto Alegre, Rio Grande do Sul, Brazil
- Programa de Pós-Graduação em Biologia Celular e Molecular, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Porto Alegre, Rio Grande do Sul, Brazil
- * E-mail: (LB); (DSS)
| |
Collapse
|
10
|
Abstract
The model eukaryote Saccharomyces cerevisiae is well suited to investigate the causes of metabolic disturbance. PRPP [5-phospho-D-ribosyl-1(alpha)-pyrophosphate] may be regarded as a junction of carbon and nitrogen metabolism. As a result of this central position, perturbations in its synthesis can give rise to many unexpected cellular events, such as impaired cell integrity. We have taken advantage of S. cerevisiae's genetic tractability to investigate the metabolic links responsible for connecting the biochemical intermediate PRPP to apparently unrelated cellular functions. This approach provides insight into the co-ordination of different biological processes.
Collapse
|
11
|
In Saccharomyces cerevisiae, impaired PRPP synthesis is accompanied by valproate and Li+ sensitivity. Biochem Soc Trans 2005. [DOI: 10.1042/bst0331154] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The biosynthetic intermediate PRPP (phosphoribosylpyrophosphate) has a central role in cellular biochemistry since it links carbon and nitrogen metabolism. Its importance may be reflected in the fact that, in the Saccharomyces cerevisiae (yeast) genome, there are five unlinked genes, PRS1–PRS5, each of which is theoretically capable of encoding the enzyme synthesizing PRPP. Interference with the complement of PRS genes in S. cerevisiae has far-reaching consequences for yeast physiology and has uncovered unexpected metabolic links including cell wall integrity and phospholipid metabolism.
Collapse
|
12
|
Current awareness on yeast. Yeast 2001; 18:577-84. [PMID: 11284013 DOI: 10.1002/yea.684] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
|