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Mara P, Zhou YL, Teske A, Morono Y, Beaudoin D, Edgcomb V. Microbial gene expression in Guaymas Basin subsurface sediments responds to hydrothermal stress and energy limitation. THE ISME JOURNAL 2023; 17:1907-1919. [PMID: 37658181 PMCID: PMC10579382 DOI: 10.1038/s41396-023-01492-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Revised: 08/01/2023] [Accepted: 08/02/2023] [Indexed: 09/03/2023]
Abstract
Analyses of gene expression of subsurface bacteria and archaea provide insights into their physiological adaptations to in situ subsurface conditions. We examined patterns of expressed genes in hydrothermally heated subseafloor sediments with distinct geochemical and thermal regimes in Guaymas Basin, Gulf of California, Mexico. RNA recovery and cell counts declined with sediment depth, however, we obtained metatranscriptomes from eight sites at depths spanning between 0.8 and 101.9 m below seafloor. We describe the metabolic potential of sediment microorganisms, and discuss expressed genes involved in tRNA, mRNA, and rRNA modifications that enable physiological flexibility of bacteria and archaea in the hydrothermal subsurface. Microbial taxa in hydrothermally influenced settings like Guaymas Basin may particularly depend on these catalytic RNA functions since they modulate the activity of cells under elevated temperatures and steep geochemical gradients. Expressed genes for DNA repair, protein maintenance and circadian rhythm were also identified. The concerted interaction of many of these genes may be crucial for microorganisms to survive and to thrive in the Guaymas Basin subsurface biosphere.
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Affiliation(s)
- Paraskevi Mara
- Geology and Geophysics Department, Woods Hole Oceanographic Institution, Woods Hole, MA, USA
| | - Ying-Li Zhou
- Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, China
| | - Andreas Teske
- Department of Earth, Marine and Environmental Sciences, University of North Carolina, Chapel Hill, NC, USA
| | - Yuki Morono
- Kochi Institute for Core Sample Research, Institute for Extra-cutting-edge Science and Technology Avant-garde Research (X-star), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Monobe, Nankoku, Kochi, Japan
| | - David Beaudoin
- Biology Department, Woods Hole Oceanographic Institution, Woods Hole, MA, USA
| | - Virginia Edgcomb
- Geology and Geophysics Department, Woods Hole Oceanographic Institution, Woods Hole, MA, USA.
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Cesur MF, Basile A, Patil KR, Çakır T. A new metabolic model of Drosophila melanogaster and the integrative analysis of Parkinson's disease. Life Sci Alliance 2023; 6:e202201695. [PMID: 37236669 PMCID: PMC10215973 DOI: 10.26508/lsa.202201695] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2022] [Revised: 05/11/2023] [Accepted: 05/12/2023] [Indexed: 05/28/2023] Open
Abstract
High conservation of the disease-associated genes between flies and humans facilitates the common use of Drosophila melanogaster to study metabolic disorders under controlled laboratory conditions. However, metabolic modeling studies are highly limited for this organism. We here report a comprehensively curated genome-scale metabolic network model of Drosophila using an orthology-based approach. The gene coverage and metabolic information of the draft model derived from a reference human model were expanded via Drosophila-specific KEGG and MetaCyc databases, with several curation steps to avoid metabolic redundancy and stoichiometric inconsistency. Furthermore, we performed literature-based curations to improve gene-reaction associations, subcellular metabolite locations, and various metabolic pathways. The performance of the resulting Drosophila model (8,230 reactions, 6,990 metabolites, and 2,388 genes), iDrosophila1 (https://github.com/SysBioGTU/iDrosophila), was assessed using flux balance analysis in comparison with the other currently available fly models leading to superior or comparable results. We also evaluated the transcriptome-based prediction capacity of iDrosophila1, where differential metabolic pathways during Parkinson's disease could be successfully elucidated. Overall, iDrosophila1 is promising to investigate system-level metabolic alterations in response to genetic and environmental perturbations.
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Affiliation(s)
- Müberra Fatma Cesur
- Systems Biology and Bioinformatics Program, Department of Bioengineering, Gebze Technical University, Kocaeli, Turkey
| | - Arianna Basile
- Medical Research Council Toxicology Unit, University of Cambridge, Cambridge, UK
| | - Kiran Raosaheb Patil
- Medical Research Council Toxicology Unit, University of Cambridge, Cambridge, UK
| | - Tunahan Çakır
- Systems Biology and Bioinformatics Program, Department of Bioengineering, Gebze Technical University, Kocaeli, Turkey
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Wang M, Wu C, Liu N, Zhang F, Dong H, Wang S, Chen M, Jiang X, Zhang K, Gu L. SARS-CoV-2 RdRp uses NDPs as a substrate and is able to incorporate NHC into RNA from diphosphate form molnupiravir. Int J Biol Macromol 2023; 226:946-955. [PMID: 36528144 PMCID: PMC9749393 DOI: 10.1016/j.ijbiomac.2022.12.112] [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: 07/23/2022] [Revised: 12/08/2022] [Accepted: 12/11/2022] [Indexed: 12/23/2022]
Abstract
The coronavirus disease 2019 has been ravaging throughout the world for three years and has severely impaired both human health and the economy. The causative agent, severe acute respiratory syndrome coronavirus 2 employs the viral RNA dependent RNA polymerase (RdRp) complex for genome replication and transcription, making RdRp an appealing target for antiviral drug development. Systematic characterization of RdRp will undoubtedly aid in the development of antiviral drugs targeting RdRp. Here, our research reveals that RdRp can recognize and utilize nucleoside diphosphates as a substrate to synthesize RNA with an efficiency of about two thirds of using nucleoside triphosphates as a substrate. Nucleoside diphosphates incorporation is also template-specific and has high fidelity. Moreover, RdRp can incorporate β-d-N4-hydroxycytidine into RNA while using diphosphate form molnupiravir as a substrate. This incorporation results in genome mutation and virus death. It is also observed that diphosphate form molnupiravir is a better substrate for RdRp than the triphosphate form molnupiravir, presenting a new strategy for drug design.
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Affiliation(s)
- Maofeng Wang
- State Key Laboratory of Microbial Technology, Shandong University, 72 Binhai Road, Qingdao 266237, PR China
| | - Cancan Wu
- State Key Laboratory of Microbial Technology, Shandong University, 72 Binhai Road, Qingdao 266237, PR China
| | - Nan Liu
- State Key Laboratory of Microbial Technology, Shandong University, 72 Binhai Road, Qingdao 266237, PR China
| | - Fengyu Zhang
- State Key Laboratory of Microbial Technology, Shandong University, 72 Binhai Road, Qingdao 266237, PR China
| | - Hongjie Dong
- State Key Laboratory of Microbial Technology, Shandong University, 72 Binhai Road, Qingdao 266237, PR China
| | - Shuai Wang
- State Key Laboratory of Microbial Technology, Shandong University, 72 Binhai Road, Qingdao 266237, PR China
| | - Min Chen
- State Key Laboratory of Microbial Technology, Shandong University, 72 Binhai Road, Qingdao 266237, PR China
| | - Xiaoqiong Jiang
- State Key Laboratory of Microbial Technology, Shandong University, 72 Binhai Road, Qingdao 266237, PR China
| | - Kundi Zhang
- State Key Laboratory of Microbial Technology, Shandong University, 72 Binhai Road, Qingdao 266237, PR China.
| | - Lichuan Gu
- State Key Laboratory of Microbial Technology, Shandong University, 72 Binhai Road, Qingdao 266237, PR China.
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Wimmer JLE, Kleinermanns K, Martin WF. Pyrophosphate and Irreversibility in Evolution, or why PP i Is Not an Energy Currency and why Nature Chose Triphosphates. Front Microbiol 2021; 12:759359. [PMID: 34759911 PMCID: PMC8575175 DOI: 10.3389/fmicb.2021.759359] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Accepted: 09/15/2021] [Indexed: 11/13/2022] Open
Abstract
The possible evolutionary significance of pyrophosphate (PPi) has been discussed since the early 1960s. Lipmann suggested that PPi could have been an ancient currency or a possible environmental source of metabolic energy at origins, while Kornberg proposed that PPi vectorializes metabolism because ubiquitous pyrophosphatases render PPi forming reactions kinetically irreversible. To test those ideas, we investigated the reactions that consume phosphoanhydride bonds among the 402 reactions of the universal biosynthetic core that generates amino acids, nucleotides, and cofactors from H2, CO2, and NH3. We find that 36% of the core's phosphoanhydride hydrolyzing reactions generate PPi, while no reactions use PPi as an energy currency. The polymerization reactions that generate ~80% of cell mass - protein, RNA, and DNA synthesis - all generate PPi, while none use PPi as an energy source. In typical prokaryotic cells, aminoacyl tRNA synthetases (AARS) underlie ~80% of PPi production. We show that the irreversibility of the AARS reaction is a kinetic, not a thermodynamic effect. The data indicate that PPi is not an ancient energy currency and probably never was. Instead, PPi hydrolysis is an ancient mechanism that imparts irreversibility, as Kornberg suggested, functioning like a ratchet's pawl to vectorialize the life process toward growth. The two anhydride bonds in nucleoside triphosphates offer ATP-cleaving enzymes an option to impart either thermodynamic control (Pi formation) or kinetic control (PPi formation) upon reactions. This dual capacity explains why nature chose the triphosphate moiety of ATP as biochemistry's universal energy currency.
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Affiliation(s)
- Jessica L. E. Wimmer
- Institute for Molecular Evolution, Department of Biology, Heinrich Heine University Duesseldorf, Duesseldorf, Germany
| | - Karl Kleinermanns
- Institute for Physical Chemistry, Department of Chemistry, Heinrich Heine University Duesseldorf, Duesseldorf, Germany
| | - William F. Martin
- Institute for Molecular Evolution, Department of Biology, Heinrich Heine University Duesseldorf, Duesseldorf, Germany
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Varela FA, Freudenthal BD. Mechanism of Deoxyguanosine Diphosphate Insertion by Human DNA Polymerase β. Biochemistry 2021; 60:373-380. [PMID: 33475337 PMCID: PMC8277322 DOI: 10.1021/acs.biochem.0c00847] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
DNA polymerases play vital roles in the maintenance and replication of genomic DNA by synthesizing new nucleotide polymers using nucleoside triphosphates as substrates. Deoxynucleoside triphosphates (dNTPs) are the canonical substrates for DNA polymerases; however, some bacterial polymerases have been demonstrated to insert deoxynucleoside diphosphates (dNDPs), which lack a third phosphate group, the γ-phosphate. Whether eukaryotic polymerases can efficiently incorporate dNDPs has not been investigated, and much about the chemical or structural role played by the γ-phosphate of dNTPs remains unknown. Using the model mammalian polymerase (Pol) β, we examine how Pol β incorporates a substrate lacking a γ-phosphate [deoxyguanosine diphosphate (dGDP)] utilizing kinetic and crystallographic approaches. Using single-turnover kinetics, we determined dGDP insertion across a templating dC by Pol β to be drastically impaired when compared to dGTP insertion. We found the most significant impairment in the apparent insertion rate (kpol), which was reduced 32000-fold compared to that of dGTP insertion. X-ray crystal structures revealed similar enzyme-substrate contacts for both dGDP and dGTP. These findings suggest the insertion efficiency of dGDP is greatly decreased due to impairments in polymerase chemistry. This work is the first instance of a mammalian polymerase inserting a diphosphate nucleotide and provides insight into the nature of polymerase mechanisms by highlighting how these enzymes have evolved to use triphosphate nucleotide substrates.
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Affiliation(s)
- Fausto A. Varela
- Department of Biochemistry and Molecular Biology and Department of Cancer Biology, University of Kansas Medical Center, Kansas City, Kansas 66160, United States
| | - Bret D. Freudenthal
- Department of Biochemistry and Molecular Biology and Department of Cancer Biology, University of Kansas Medical Center, Kansas City, Kansas 66160, United States
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