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Kipkorir T, Polgar P, Barker D, D’Halluin A, Patel Z, Arnvig K. A novel regulatory interplay between atypical B12 riboswitches and uORF translation in Mycobacterium tuberculosis. Nucleic Acids Res 2024; 52:7876-7892. [PMID: 38709884 PMCID: PMC11260477 DOI: 10.1093/nar/gkae338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Revised: 04/10/2024] [Accepted: 04/17/2024] [Indexed: 05/08/2024] Open
Abstract
Vitamin B12 is an essential cofactor in all domains of life and B12-sensing riboswitches are some of the most widely distributed riboswitches. Mycobacterium tuberculosis, the causative agent of tuberculosis, harbours two B12-sensing riboswitches. One controls expression of metE, encoding a B12-independent methionine synthase, the other controls expression of ppe2 of uncertain function. Here, we analysed ligand sensing, secondary structure and gene expression control of the metE and ppe2 riboswitches. Our results provide the first evidence of B12 binding by these riboswitches and show that they exhibit different preferences for individual isoforms of B12, use distinct regulatory and structural elements and act as translational OFF switches. Based on our results, we propose that the ppe2 switch represents a new variant of Class IIb B12-sensing riboswitches. Moreover, we have identified short translated open reading frames (uORFs) upstream of metE and ppe2, which modulate the expression of their downstream genes. Translation of the metE uORF suppresses MetE expression, while translation of the ppe2 uORF is essential for PPE2 expression. Our findings reveal an unexpected regulatory interplay between B12-sensing riboswitches and the translational machinery, highlighting a new level of cis-regulatory complexity in M. tuberculosis. Attention to such mechanisms will be critical in designing next-level intervention strategies.
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Affiliation(s)
- Terry Kipkorir
- Institute for Structural and Molecular Biology, University College London, Gower Street, WC1E 6BT London, UK
| | - Peter Polgar
- Institute for Structural and Molecular Biology, University College London, Gower Street, WC1E 6BT London, UK
| | - Declan Barker
- Institute for Structural and Molecular Biology, University College London, Gower Street, WC1E 6BT London, UK
| | - Alexandre D’Halluin
- Institute for Structural and Molecular Biology, University College London, Gower Street, WC1E 6BT London, UK
| | - Zaynah Patel
- Institute for Structural and Molecular Biology, University College London, Gower Street, WC1E 6BT London, UK
| | - Kristine B Arnvig
- Institute for Structural and Molecular Biology, University College London, Gower Street, WC1E 6BT London, UK
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Izquierdo Lafuente B, Verboom T, Coenraads S, Ummels R, Bitter W, Speer A. Vitamin B 12 uptake across the mycobacterial outer membrane is influenced by membrane permeability in Mycobacterium marinum. Microbiol Spectr 2024; 12:e0316823. [PMID: 38722177 DOI: 10.1128/spectrum.03168-23] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2023] [Accepted: 04/12/2024] [Indexed: 06/06/2024] Open
Abstract
Vitamin B12 (B12) serves as a critical cofactor within mycobacterial metabolism. While some pathogenic strains can synthesize B12 de novo, others rely on host-acquired B12. In this investigation, we studied the transport of vitamin B12 in Mycobacterium marinum using B12-auxotrophic and B12-sensitive strains by deleting metH or metE, respectively. These two enzymes rely on B12 in different ways to function as methionine synthases. We used these strains to select mutants affecting B12 scavenging and confirmed their phenotypes during growth experiments in vitro. Our analysis of B12 uptake mechanisms revealed that membrane lipids and cell wall integrity play an essential role in cell envelope transport. Furthermore, we identified a potential transcription regulator that responds to B12. Our study demonstrates that M. marinum can take up exogenous B12 and that altering mycobacterial membrane integrity affects B12 uptake. Finally, during zebrafish infection using B12-auxotrophic and B12-sensitive strains, we found that B12 is available for virulent mycobacteria in vivo.IMPORTANCEOur study investigates how mycobacteria acquire essential vitamin B12. These microbes, including those causing tuberculosis, face challenges in nutrient uptake due to their strong outer layer. We focused on Mycobacterium marinum, similar to TB bacteria, to uncover its vitamin B12 absorption. We used modified strains unable to produce their own B12 and discovered that M. marinum can indeed absorb it from the environment, even during infections. Changes in the outer layer composition affect this process, and genes related to membrane integrity play key roles. These findings illuminate the interaction between mycobacteria and their environment, offering insights into combatting diseases like tuberculosis through innovative strategies. Our concise research underscores the pivotal role of vitamin B12 in microbial survival and its potential applications in disease control.
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Affiliation(s)
- Beatriz Izquierdo Lafuente
- Section Molecular Microbiology, Amsterdam Institute of Molecular and Life Sciences (AIMMS), Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - Theo Verboom
- Department of Medical Microbiology and Infection Control, Amsterdam UMC, Amsterdam, The Netherlands
| | - Sita Coenraads
- Section Molecular Microbiology, Amsterdam Institute of Molecular and Life Sciences (AIMMS), Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - Roy Ummels
- Department of Medical Microbiology and Infection Control, Amsterdam UMC, Amsterdam, The Netherlands
| | - Wilbert Bitter
- Section Molecular Microbiology, Amsterdam Institute of Molecular and Life Sciences (AIMMS), Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
- Department of Medical Microbiology and Infection Control, Amsterdam UMC, Amsterdam, The Netherlands
| | - Alexander Speer
- Department of Medical Microbiology and Infection Control, Amsterdam UMC, Amsterdam, The Netherlands
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3
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Nijland M, Lefebvre SN, Thangaratnarajah C, Slotboom DJ. Bidirectional ATP-driven transport of cobalamin by the mycobacterial ABC transporter BacA. Nat Commun 2024; 15:2626. [PMID: 38521790 PMCID: PMC10960864 DOI: 10.1038/s41467-024-46917-1] [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: 10/13/2023] [Accepted: 03/13/2024] [Indexed: 03/25/2024] Open
Abstract
BacA is a mycobacterial ATP-binding cassette (ABC) transporter involved in the translocation of water-soluble compounds across the lipid bilayer. Whole-cell-based assays have shown that BacA imports cobalamin as well as unrelated hydrophilic compounds such as the antibiotic bleomycin and the antimicrobial peptide Bac7 into the cytoplasm. Surprisingly, there are indications that BacA also mediates the export of different antibacterial compounds, which is difficult to reconcile with the notion that ABC transporters generally operate in a strictly unidirectional manner. Here we resolve this conundrum by developing a fluorescence-based transport assay to monitor the transport of cobalamin across liposomal membranes. We find that BacA transports cobalamin in both the import and export direction. This highly unusual bidirectionality suggests that BacA is mechanistically distinct from other ABC transporters and facilitates ATP-driven diffusion, a function that may be important for the evolvability of specific transporters, and may bring competitive advantages to microbial communities.
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Affiliation(s)
- Mark Nijland
- Faculty of Science and Engineering, Groningen, Biomolecular Sciences and Biotechnology, Membrane Enzymology Group, University of Groningen, 9747 AG, Groningen, The Netherlands
| | - Solène N Lefebvre
- Faculty of Science and Engineering, Groningen, Biomolecular Sciences and Biotechnology, Membrane Enzymology Group, University of Groningen, 9747 AG, Groningen, The Netherlands
| | - Chancievan Thangaratnarajah
- Faculty of Science and Engineering, Groningen, Biomolecular Sciences and Biotechnology, Membrane Enzymology Group, University of Groningen, 9747 AG, Groningen, The Netherlands
- Sosei Heptares, Steinmetz Building, Granta Park, Great Abington, Cambridge, CB21 6DG, UK
| | - Dirk J Slotboom
- Faculty of Science and Engineering, Groningen, Biomolecular Sciences and Biotechnology, Membrane Enzymology Group, University of Groningen, 9747 AG, Groningen, The Netherlands.
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Campos-Pardos E, Uranga S, Picó A, Gómez AB, Gonzalo-Asensio J. Dependency on host vitamin B12 has shaped Mycobacterium tuberculosis Complex evolution. Nat Commun 2024; 15:2161. [PMID: 38461302 PMCID: PMC10924821 DOI: 10.1038/s41467-024-46449-8] [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: 02/22/2023] [Accepted: 02/27/2024] [Indexed: 03/11/2024] Open
Abstract
Human and animal tuberculosis is caused by the Mycobacterium tuberculosis Complex (MTBC), which has evolved a genomic decay of cobalamin (vitamin B12) biosynthetic genes. Accordingly, and in sharp contrast to environmental, opportunistic and ancestor mycobacteria; we demonstrate that M. tuberculosis (Mtb), M. africanum, and animal-adapted lineages, lack endogenous production of cobalamin, yet they retain the capacity for exogenous uptake. A B12 anemic model in immunocompromised and immunocompetent mice, demonstrates improved survival, and lower bacteria in organs, in B12 anemic animals infected with Mtb relative to non-anemic controls. Conversely, no differences were observed between mice groups infected with M. canettii, an ancestor mycobacterium which retains cobalamin biosynthesis. Interrogation of the B12 transcriptome in three MTBC strains defined L-methionine synthesis by metE and metH genes as a key phenotype. Expression of metE is repressed by a cobalamin riboswitch, while MetH requires the cobalamin cofactor. Thus, deletion of metE predominantly attenuates Mtb in anemic mice; although inactivation of metH exclusively causes attenuation in non-anemic controls. Here, we show how sub-physiological levels of B12 in the host antagonizes Mtb virulence, and describe a yet unknown mechanism of host-pathogen cross-talk with implications for B12 anemic populations.
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Affiliation(s)
- Elena Campos-Pardos
- Grupo de Genética de Micobacterias, Departamento de Microbiología. Facultad de Medicina, Universidad de Zaragoza, IIS Aragón, Zaragoza, Spain
- CIBER Enfermedades Respiratorias, Instituto de Salud Carlos III, Madrid, Spain
| | - Santiago Uranga
- Grupo de Genética de Micobacterias, Departamento de Microbiología. Facultad de Medicina, Universidad de Zaragoza, IIS Aragón, Zaragoza, Spain
- CIBER Enfermedades Respiratorias, Instituto de Salud Carlos III, Madrid, Spain
| | - Ana Picó
- Grupo de Genética de Micobacterias, Departamento de Microbiología. Facultad de Medicina, Universidad de Zaragoza, IIS Aragón, Zaragoza, Spain
- CIBER Enfermedades Respiratorias, Instituto de Salud Carlos III, Madrid, Spain
| | - Ana Belén Gómez
- Grupo de Genética de Micobacterias, Departamento de Microbiología. Facultad de Medicina, Universidad de Zaragoza, IIS Aragón, Zaragoza, Spain
- CIBER Enfermedades Respiratorias, Instituto de Salud Carlos III, Madrid, Spain
| | - Jesús Gonzalo-Asensio
- Grupo de Genética de Micobacterias, Departamento de Microbiología. Facultad de Medicina, Universidad de Zaragoza, IIS Aragón, Zaragoza, Spain.
- CIBER Enfermedades Respiratorias, Instituto de Salud Carlos III, Madrid, Spain.
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Li K, Chen Y, Xie J, Cai W, Pang C, Cui C, Huan Y, Deng B. How vitamins act as novel agents for ameliorating diabetic peripheral neuropathy: A comprehensive overview. Ageing Res Rev 2023; 91:102064. [PMID: 37689144 DOI: 10.1016/j.arr.2023.102064] [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: 03/19/2023] [Revised: 08/10/2023] [Accepted: 09/01/2023] [Indexed: 09/11/2023]
Abstract
Diabetic peripheral neuropathy (DPN) is a pervasive and incapacitating sequela of diabetes, affecting a significant proportion of those diagnosed with the disease, yet an effective treatment remains elusive. Vitamins have been extensively studied, emerging as a promising target for diagnosing and treating various systemic diseases, but their role in DPN is not known. This review collates and synthesizes knowledge regarding the interplay between vitamins and DPN, drawing on bibliographies from prior studies and relevant articles, and stratifying the therapeutic strategies from prophylactic to interventional. In addition, the clinical evidence supporting the use of vitamins to ameliorate DPN is also evaluated, underscoring the potential of vitamins as putative therapeutic agents. We anticipate that this review will offer novel insights for developing and applying vitamin-based therapies for DPN.
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Affiliation(s)
- Kezheng Li
- Department of Neurology, First Affiliated Hospital of Wenzhou Medical University, Wenzhou, PR China; First School of Clinical Medicine, Wenzhou Medical University, Wenzhou, PR China
| | - Yinuo Chen
- Department of Neurology, First Affiliated Hospital of Wenzhou Medical University, Wenzhou, PR China; First School of Clinical Medicine, Wenzhou Medical University, Wenzhou, PR China
| | - Jiali Xie
- Department of Neurology, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, PR China
| | - Weiwei Cai
- Department of Rheumatology and Immunology, Beijing Hospital, Beijing, PR China
| | - Chunyang Pang
- Department of Neurology, First Affiliated Hospital of Wenzhou Medical University, Wenzhou, PR China
| | - Can Cui
- Department of Clinical Sciences Malmö, Lund University, Skåne, Sweden
| | - Yu Huan
- Department of Pediatrics, Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, PR China
| | - Binbin Deng
- Department of Neurology, First Affiliated Hospital of Wenzhou Medical University, Wenzhou, PR China; First School of Clinical Medicine, Wenzhou Medical University, Wenzhou, PR China.
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Romano GE, Silva-Pereira TT, de Melo FM, Sisco MC, Banari AC, Zimpel CK, Soler-Camargo NC, Guimarães AMDS. Unraveling the metabolism of Mycobacterium caprae using comparative genomics. Tuberculosis (Edinb) 2022; 136:102254. [PMID: 36126496 DOI: 10.1016/j.tube.2022.102254] [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: 02/27/2022] [Revised: 08/01/2022] [Accepted: 08/25/2022] [Indexed: 11/19/2022]
Abstract
In our laboratory, Mycobacterium caprae has poor growth in standard medium (SM) 7H9-OADC supplemented with pyruvate and Tween-80. Our objectives were to identify mutations affecting M. caprae metabolism and use this information to design a culture medium to improve its growth. We selected 77 M. caprae genomes and sequenced M. caprae NLA000201913 used in our experiments. Mutations present in >95% of the strains compared to Mycobacterium tuberculosis H37Rv were analyzed in silico for their deleterious effects on proteins of metabolic pathways. Apart from the known defect in the pyruvate kinase, M. caprae has important lesions in enzymes of the TCA cycle, methylmalonyl cycle, B12 metabolism, and electron-transport chain. We provide evidence of enzymatic redundancy elimination and epistatic mutations, and possible production of toxic metabolites hindering M. caprae growth in vitro. A newly designed SM supplemented with l-glutamate allowed faster growth and increased final microbial mass of M. caprae. However, possible accumulation of metabolic waste-products and/or nutritional limitations halted M. caprae growth prior to a M. tuberculosis-like stationary phase. Our findings suggest that M. caprae relies on GABA and/or glyoxylate shunts for in vitro growth in routine media. The newly developed medium will improve experiments with this bacterium by allowing faster growth in vitro.
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Affiliation(s)
- Giovanni Emiddio Romano
- Laboratory of Applied Research in Mycobacteria (LaPAM), Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, 1374 Prof Lineu Prestes Avenue, Room 229, São Paulo, SP, 05508-000, Brazil.
| | - Taiana Tainá Silva-Pereira
- Laboratory of Applied Research in Mycobacteria (LaPAM), Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, 1374 Prof Lineu Prestes Avenue, Room 229, São Paulo, SP, 05508-000, Brazil.
| | - Filipe Menegatti de Melo
- Laboratory of Applied Research in Mycobacteria (LaPAM), Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, 1374 Prof Lineu Prestes Avenue, Room 229, São Paulo, SP, 05508-000, Brazil.
| | - Maria Carolina Sisco
- Laboratory of Applied Research in Mycobacteria (LaPAM), Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, 1374 Prof Lineu Prestes Avenue, Room 229, São Paulo, SP, 05508-000, Brazil.
| | - Alexandre Campos Banari
- Laboratory of Applied Research in Mycobacteria (LaPAM), Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, 1374 Prof Lineu Prestes Avenue, Room 229, São Paulo, SP, 05508-000, Brazil; Department of Preventive Veterinary Medicine and Animal Health, College of Veterinary Medicine, University of São Paulo, 87 Prof Dr Orlando Marques de Paiva Avenue, São Paulo, SP, 05508-270, Brazil.
| | - Cristina Kraemer Zimpel
- Laboratory of Applied Research in Mycobacteria (LaPAM), Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, 1374 Prof Lineu Prestes Avenue, Room 229, São Paulo, SP, 05508-000, Brazil; Department of Preventive Veterinary Medicine and Animal Health, College of Veterinary Medicine, University of São Paulo, 87 Prof Dr Orlando Marques de Paiva Avenue, São Paulo, SP, 05508-270, Brazil.
| | - Naila Cristina Soler-Camargo
- Laboratory of Applied Research in Mycobacteria (LaPAM), Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, 1374 Prof Lineu Prestes Avenue, Room 229, São Paulo, SP, 05508-000, Brazil; Department of Preventive Veterinary Medicine and Animal Health, College of Veterinary Medicine, University of São Paulo, 87 Prof Dr Orlando Marques de Paiva Avenue, São Paulo, SP, 05508-270, Brazil.
| | - Ana Marcia de Sá Guimarães
- Laboratory of Applied Research in Mycobacteria (LaPAM), Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, 1374 Prof Lineu Prestes Avenue, Room 229, São Paulo, SP, 05508-000, Brazil; Department of Comparative Pathobiology, College of Veterinary Medicine, Purdue University. 625 Harrison Street, West Lafayette, IN, 47907, USA.
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Pepperell CS. Evolution of Tuberculosis Pathogenesis. Annu Rev Microbiol 2022; 76:661-680. [PMID: 35709500 DOI: 10.1146/annurev-micro-121321-093031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Mycobacterium tuberculosis is a globally distributed, lethal pathogen of humans. The virulence armamentarium of M. tuberculosis appears to have been developed on a scaffold of antiphagocytic defenses found among diverse, mostly free-living species of Mycobacterium. Pathoadaptation was further aided by the modularity, flexibility, and interactivity characterizing mycobacterial effectors and their regulators. During emergence of M. tuberculosis, novel genetic material was acquired, created, and integrated with existing tools. The major mutational mechanisms underlying these adaptations are discussed in this review, with examples. During its evolution, M. tuberculosis lost the ability and/or opportunity to engage in lateral gene transfer, but despite this it has retained the adaptability that characterizes mycobacteria. M. tuberculosis exemplifies the evolutionary genomic mechanisms underlying adoption of the pathogenic niche, and studies of its evolution have uncovered a rich array of discoveries about how new pathogens are made. Expected final online publication date for the Annual Review of Microbiology, Volume 76 is September 2022. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.
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Affiliation(s)
- Caitlin S Pepperell
- Division of Infectious Diseases, Department of Medicine, and Department of Medical Microbiology and Immunology, School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, USA;
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Santamaria G, Ruiz-Rodriguez P, Renau-Mínguez C, Pinto FR, Coscollá M. In Silico Exploration of Mycobacterium tuberculosis Metabolic Networks Shows Host-Associated Convergent Fluxomic Phenotypes. Biomolecules 2022; 12:376. [PMID: 35327567 PMCID: PMC8945471 DOI: 10.3390/biom12030376] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Revised: 01/29/2022] [Accepted: 02/22/2022] [Indexed: 02/04/2023] Open
Abstract
Mycobacterium tuberculosis, the causative agent of tuberculosis, is composed of several lineages characterized by a genome identity higher than 99%. Although the majority of the lineages are associated with humans, at least four lineages are adapted to other mammals, including different M. tuberculosis ecotypes. Host specificity is associated with higher virulence in its preferred host in ecotypes such as M. bovis. Deciphering what determines the preference of the host can reveal host-specific virulence patterns. However, it is not clear which genomic determinants might be influencing host specificity. In this study, we apply a combination of unsupervised and supervised classification methods on genomic data of ~27,000 M. tuberculosis clinical isolates to decipher host-specific genomic determinants. Host-specific genomic signatures are scarce beyond known lineage-specific mutations. Therefore, we integrated lineage-specific mutations into the iEK1011 2.0 genome-scale metabolic model to obtain lineage-specific versions of it. Flux distributions sampled from the solution spaces of these models can be accurately separated according to host association. This separation correlated with differences in cell wall processes, lipid, amino acid and carbon metabolic subsystems. These differences were observable when more than 95% of the samples had a specific growth rate significantly lower than the maximum achievable by the models. This suggests that these differences might manifest at low growth rate settings, such as the restrictive conditions M. tuberculosis suffers during macrophage infection.
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Affiliation(s)
- Guillem Santamaria
- ISysBio, University of Valencia-FISABIO Joint Unit, 46980 Paterna, Spain; (G.S.); (P.R.-R.); (C.R.-M.)
- BioISI—Biosciences & Integrative Sciences Institute, Faculty of Sciences, University of Lisboa, 1749-016 Lisboa, Portugal
| | - Paula Ruiz-Rodriguez
- ISysBio, University of Valencia-FISABIO Joint Unit, 46980 Paterna, Spain; (G.S.); (P.R.-R.); (C.R.-M.)
| | - Chantal Renau-Mínguez
- ISysBio, University of Valencia-FISABIO Joint Unit, 46980 Paterna, Spain; (G.S.); (P.R.-R.); (C.R.-M.)
| | - Francisco R. Pinto
- BioISI—Biosciences & Integrative Sciences Institute, Faculty of Sciences, University of Lisboa, 1749-016 Lisboa, Portugal
| | - Mireia Coscollá
- ISysBio, University of Valencia-FISABIO Joint Unit, 46980 Paterna, Spain; (G.S.); (P.R.-R.); (C.R.-M.)
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