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Graña-Miraglia L, Geney Higuita JL, Salazar JC, Guaya Iñiguez D, Alcolado León C, García-Angulo VA. Total substitution and partial modification of the set of non-ribosomal peptide synthetases clusters lead to pyoverdine diversity in the Pseudomonas fluorescens complex. Front Microbiol 2024; 15:1421749. [PMID: 39224222 PMCID: PMC11366639 DOI: 10.3389/fmicb.2024.1421749] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2024] [Accepted: 07/30/2024] [Indexed: 09/04/2024] Open
Abstract
Pyoverdines are high affinity siderophores produced by most Pseudomonas with a wide role in microbial interspecies interactions. They are primarily composed of a conserved chromophore moiety, an acyl side chain and a peptide backbone which may be highly variable among strains. Upon ferric iron sequestration, pyoverdines are internalized through specialized receptors. The peptide precursor of pyoverdine, termed ferribactin, is synthesized by a set of non-ribosomal peptide synthetase (NRPS) enzymes and further modified by tailoring enzymes. While PvdL, the NRPS responsible for the synthesis of the peptide moiety that derives into the chromophore is conserved, the NRPSs for the peptide backbone are different across fluorescent Pseudomonas. Although the variation of pyoverdine is a widely recognized characteristic within the genus, the evolutionary events associated with the diversity and distribution of this trait remain mostly unknown. This study analyzed the NRPSs clusters for the biosynthesis of the peptide backbone of ferribactin in the genomes of a representative subset of strains of the Pseudomonas fluorescens complex. Bioinformatic analysis of the specificity of adenylation domains of the NRPSs allowed the prediction of 30 different pyoverdine variants. Phylogenetic reconstruction and mapping of the NRPS clusters pinpointed two different general levels of modifications. In the first level, a complete replacement of the set of NRPRs by horizontal transfer occurs. In the second level, the original set of NRPSs is modified through different mechanisms, including partial substitution of the NRPS genes by horizontal transfer, adenylation domain specificity change or NRPS accessory domain gain/loss.
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Affiliation(s)
- Lucía Graña-Miraglia
- Department of Cell and Systems Biology, University of Toronto, Toronto, ON, Canada
| | - Jorge Luis Geney Higuita
- Bacterial Metabolism Laboratory, Instituto de Ciencias Biomédicas, Microbiology and Mycology Program, University of Chile, Santiago, Chile
| | - Juan Carlos Salazar
- Laboratory of Enteropathogens, Instituto de Ciencias Biomédicas, Microbiology and Mycology Program, University of Chile, Santiago, Chile
| | - Diana Guaya Iñiguez
- Bacterial Metabolism Laboratory, Instituto de Ciencias Biomédicas, Microbiology and Mycology Program, University of Chile, Santiago, Chile
| | - Carlos Alcolado León
- Bacterial Metabolism Laboratory, Instituto de Ciencias Biomédicas, Microbiology and Mycology Program, University of Chile, Santiago, Chile
| | - Víctor A. García-Angulo
- Bacterial Metabolism Laboratory, Instituto de Ciencias Biomédicas, Microbiology and Mycology Program, University of Chile, Santiago, Chile
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Song Y, Wu X, Li Z, Ma QQ, Bao R. Molecular mechanism of siderophore regulation by the Pseudomonas aeruginosa BfmRS two-component system in response to osmotic stress. Commun Biol 2024; 7:295. [PMID: 38461208 PMCID: PMC10924945 DOI: 10.1038/s42003-024-05995-z] [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: 11/13/2023] [Accepted: 02/29/2024] [Indexed: 03/11/2024] Open
Abstract
Pseudomonas aeruginosa, a common nosocomial pathogen, relies on siderophores to acquire iron, crucial for its survival in various environments and during host infections. However, understanding the molecular mechanisms of siderophore regulation remains incomplete. In this study, we found that the BfmRS two-component system, previously associated with biofilm formation and quorum sensing, is essential for siderophore regulation under high osmolality stress. Activated BfmR directly bound to the promoter regions of pvd, fpv, and femARI gene clusters, thereby activating their transcription and promoting siderophore production. Subsequent proteomic and phenotypic analyses confirmed that deletion of BfmRS reduces siderophore-related proteins and impairs bacterial survival in iron-deficient conditions. Furthermore, phylogenetic analysis demonstrated the high conservation of the BfmRS system across Pseudomonas species, functional evidences also indicated that BfmR homologues from Pseudomonas putida KT2440 and Pseudomonas sp. MRSN12121 could bind to the promoter regions of key siderophore genes and osmolality-mediated increases in siderophore production were observed. This work illuminates a novel signaling pathway for siderophore regulation and enhances our understanding of siderophore-mediated bacterial interactions and community establishment.
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Affiliation(s)
- Yingjie Song
- College of Life Science, Sichuan Normal University, Chengdu, 610101, China
| | - Xiyu Wu
- Advanced Mass Spectrometry Center, Research Core Facility, Frontiers Science Center for Disease-related Molecular Network, West China Hospital, Sichuan University, Chengdu, 610213, China
| | - Ze Li
- Center of Infectious Diseases, Division of Infectious Diseases in State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Qin Qin Ma
- College of Life Science, Sichuan Normal University, Chengdu, 610101, China
| | - Rui Bao
- Center of Infectious Diseases, Division of Infectious Diseases in State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, 610041, China.
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Slavin YN, Ivanova K, Hoyo J, Perelshtein I, Owen G, Haegert A, Lin YY, LeBihan S, Gedanken A, Häfeli UO, Tzanov T, Bach H. Novel Lignin-Capped Silver Nanoparticles against Multidrug-Resistant Bacteria. ACS APPLIED MATERIALS & INTERFACES 2021; 13:22098-22109. [PMID: 33945683 DOI: 10.1021/acsami.0c16921] [Citation(s) in RCA: 53] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
The emergence of bacteria resistant to antibiotics and the resulting infections are increasingly becoming a public health issue. Multidrug-resistant (MDR) bacteria are responsible for infections leading to increased morbidity and mortality in hospitals, prolonged time of hospitalization, and additional burden to financial costs. Therefore, there is an urgent need for novel antibacterial agents that will both treat MDR infections and outsmart the bacterial evolutionary mechanisms, preventing further resistance development. In this study, a green synthesis employing nontoxic lignin as both reducing and capping agents was adopted to formulate stable and biocompatible silver-lignin nanoparticles (NPs) exhibiting antibacterial activity. The resulting silver-lignin NPs were approximately 20 nm in diameter and did not agglomerate after one year of storage at 4 °C. They were able to inhibit the growth of a panel of MDR clinical isolates, including Staphylococcus aureus, Staphylococcus epidermidis, Pseudomonas aeruginosa, Klebsiella pneumoniae, and Acinetobacter baumannii, at concentrations that did not affect the viability of a monocyte-derived THP-1 human cell line. Furthermore, the exposure of silver-lignin NPs to the THP-1 cells led to a significant increase in the secretion of the anti-inflammatory cytokine IL-10, demonstrating the potential of these particles to act as an antimicrobial and anti-inflammatory agent simultaneously. P. aeruginosa genes linked with efflux, heavy metal resistance, capsular biosynthesis, and quorum sensing were investigated for changes in gene expression upon sublethal exposure to the silver-lignin NPs. Genes encoding for membrane proteins with an efflux function were upregulated. However, all other genes were membrane proteins that did not efflux metals and were downregulated.
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Affiliation(s)
- Yael N Slavin
- Faculty of Medicine, Division of Infectious Diseases, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
| | - Kristina Ivanova
- Grup de Biotecnologia Molecular i Industrial, Department of Chemical Engineering, Universitat Politècnica de Catalunya, Terrassa, Barcelona 08222, Spain
| | - Javier Hoyo
- Grup de Biotecnologia Molecular i Industrial, Department of Chemical Engineering, Universitat Politècnica de Catalunya, Terrassa, Barcelona 08222, Spain
| | - Ilana Perelshtein
- Department of Chemistry, Bar-Ilan University, Ramat Gan 52900, Israel
| | - Gethin Owen
- Department of Dentistry, Centre for High-Throughput Phenogenomics, Faculty of Dentistry, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
| | - Anne Haegert
- Laboratory for Advanced Genome Analysis, Vancouver Prostate Centre, Department of Urologic Sciences, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
| | - Yen-Yi Lin
- Laboratory for Advanced Genome Analysis, Vancouver Prostate Centre, Department of Urologic Sciences, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
| | - Stephane LeBihan
- Laboratory for Advanced Genome Analysis, Vancouver Prostate Centre, Department of Urologic Sciences, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
| | - Aharon Gedanken
- Department of Chemistry, Bar-Ilan University, Ramat Gan 52900, Israel
| | - Urs O Häfeli
- Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
| | - Tzanko Tzanov
- Grup de Biotecnologia Molecular i Industrial, Department of Chemical Engineering, Universitat Politècnica de Catalunya, Terrassa, Barcelona 08222, Spain
| | - Horacio Bach
- Faculty of Medicine, Division of Infectious Diseases, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
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A multilocus sequence typing scheme of Pseudomonas putida for clinical and environmental isolates. Sci Rep 2019; 9:13980. [PMID: 31562354 PMCID: PMC6765009 DOI: 10.1038/s41598-019-50299-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2018] [Accepted: 09/10/2019] [Indexed: 11/08/2022] Open
Abstract
Pseudomonas putida is a bacterium commonly found in soils, water and plants. Although P. putida group strains are considered to have low virulence, several nosocomial isolates with carbapenem- or multidrug-resistance have recently been reported. In the present study, we developed a multilocus sequence typing (MLST) scheme for P. putida. MLST loci and primers were selected and designed using the genomic information of 86 clinical isolates sequenced in this study as well as the sequences of 20 isolates previously reported. The genomes were categorised into 68 sequence types (STs). Significant linkage disequilibrium was detected for the 68 STs, indicating that the P. putida isolates are clonal. The MLST tree was similar to the haplotype network tree based on single nucleotide morphisms, demonstrating that our MLST scheme reflects the genetic diversity of P. putida group isolated from both clinical and environmental sites.
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