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Zhang L, Guo L, Cui Z, Ju F. Exploiting predatory bacteria as biocontrol agents across ecosystems. Trends Microbiol 2024; 32:398-409. [PMID: 37951768 DOI: 10.1016/j.tim.2023.10.005] [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: 06/30/2023] [Revised: 10/10/2023] [Accepted: 10/11/2023] [Indexed: 11/14/2023]
Abstract
Predatory bacteria have been increasingly known for their ubiquity in environments and great functional potentials in controlling unwanted microorganisms. Fundamental understanding of the predation mechanisms, population dynamics, and interaction patterns underlying bacterial predation is required for wise exploitation of predatory bacteria for enhancing ecoenvironmental, animal, and human health. Here, we review the recent achievements on applying predatory bacteria in different systems as biocontrol agents and living antibiotics as well as new findings in their phylogenetic diversity and predation mechanisms. We finally propose critical issues that deserve priority research and highlight the necessity to combine classic culture-based and advanced culture-independent approaches to push research frontiers of bacterial predation across ecosystems for promising biocontrol and therapy strategies towards a sustainable ecoenvironment and health.
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Affiliation(s)
- Lu Zhang
- Research Center for Industries of the Future, Westlake University, Hangzhou, Zhejiang Province, China; Key Laboratory of Coastal Environment and Resources of Zhejiang Province, School of Engineering, Westlake University, Hangzhou, Zhejiang Province, China; Center of Synthetic Biology and Integrated Bioengineering, Westlake University, Hangzhou, Zhejiang Province, China; Institute of Advanced Technology, Westlake Institute for Advanced Study, Hangzhou, Zhejiang Province, China
| | - Lingyun Guo
- Research Center for Industries of the Future, Westlake University, Hangzhou, Zhejiang Province, China; Key Laboratory of Coastal Environment and Resources of Zhejiang Province, School of Engineering, Westlake University, Hangzhou, Zhejiang Province, China; Center of Synthetic Biology and Integrated Bioengineering, Westlake University, Hangzhou, Zhejiang Province, China
| | - Zhongli Cui
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture and Rural Affairs, College of Life Sciences, Nanjing Agricultural University, Nanjing, Jiangsu Province, China
| | - Feng Ju
- Research Center for Industries of the Future, Westlake University, Hangzhou, Zhejiang Province, China; Key Laboratory of Coastal Environment and Resources of Zhejiang Province, School of Engineering, Westlake University, Hangzhou, Zhejiang Province, China; Center of Synthetic Biology and Integrated Bioengineering, Westlake University, Hangzhou, Zhejiang Province, China; Institute of Advanced Technology, Westlake Institute for Advanced Study, Hangzhou, Zhejiang Province, China; Westlake Laboratory of Life Sciences and Biomedicine, Hangzhou, Zhejiang Province, China.
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2
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Xiao Y, Cheng P, Zhu X, Xu M, Liu M, Li H, Zhang Y, Yao S. Antimicrobial Agent Functional Gold Nanocluster-Mediated Multichannel Sensor Array for Bacteria Sensing. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:2369-2376. [PMID: 38230676 DOI: 10.1021/acs.langmuir.3c03612] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2024]
Abstract
Urinary tract infections (UTIs) have greatly affected human health in recent years. Accurate and rapid diagnosis of UTIs can enable a more effective treatment. Herein, we developed a multichannel sensor array for efficient identification of bacteria based on three antimicrobial agents (vancomycin, lysozyme, and bacitracin) functional gold nanoclusters (AuNCs). In this sensor, the fluorescence intensity of the three AuNCs was quenched to varying degrees by the bacterial species, providing a unique fingerprint for different bacteria. With this sensing platform, seven pathogenic bacteria, different concentrations of the same bacteria, and even bacterial mixtures were successfully differentiated. Furthermore, UTIs can be accurately identified with our sensors in ∼30 min with 100% classification accuracy. The proposed sensing systems offer a rapid, high-throughput, and reliable sensing platform for the diagnosis of UTIs.
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Affiliation(s)
- Yuquan Xiao
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education), College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081, P.R. China
| | - Pei Cheng
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education), College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081, P.R. China
| | - Xiaohua Zhu
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education), College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081, P.R. China
- Henan Key Laboratory of Biomolecular Recognition and Sensing, College of Chemistry and Chemical Engineering, Shangqiu Normal University, Shangqiu, Henan 476000, P.R. China
| | - Maotian Xu
- Henan Key Laboratory of Biomolecular Recognition and Sensing, College of Chemistry and Chemical Engineering, Shangqiu Normal University, Shangqiu, Henan 476000, P.R. China
| | - Meiling Liu
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education), College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081, P.R. China
| | - Haitao Li
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education), College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081, P.R. China
| | - Youyu Zhang
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education), College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081, P.R. China
| | - Shouzhuo Yao
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education), College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081, P.R. China
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3
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Caulton SG, Lambert C, Tyson J, Radford P, Al-Bayati A, Greenwood S, Banks EJ, Clark C, Till R, Pires E, Sockett RE, Lovering AL. Bdellovibrio bacteriovorus uses chimeric fibre proteins to recognize and invade a broad range of bacterial hosts. Nat Microbiol 2024; 9:214-227. [PMID: 38177296 PMCID: PMC10769870 DOI: 10.1038/s41564-023-01552-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2023] [Accepted: 11/07/2023] [Indexed: 01/06/2024]
Abstract
Predatory bacteria, like the model endoperiplasmic bacterium Bdellovibrio bacteriovorus, show several adaptations relevant to their requirements for locating, entering and killing other bacteria. The mechanisms underlying prey recognition and handling remain obscure. Here we use complementary genetic, microscopic and structural methods to address this deficit. During invasion, the B. bacteriovorus protein CpoB concentrates into a vesicular compartment that is deposited into the prey periplasm. Proteomic and structural analyses of vesicle contents reveal several fibre-like proteins, which we name the mosaic adhesive trimer (MAT) superfamily, and show localization on the predator surface before prey encounter. These dynamic proteins indicate a variety of binding capabilities, and we confirm that one MAT member shows specificity for surface glycans from a particular prey. Our study shows that the B. bacteriovorus MAT protein repertoire enables a broad means for the recognition and handling of diverse prey epitopes encountered during bacterial predation and invasion.
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Affiliation(s)
- Simon G Caulton
- School of Biosciences, University of Birmingham, Birmingham, UK
| | - Carey Lambert
- School of Life Sciences, University of Nottingham, Medical School, Queen's Medical Centre, Nottingham, UK
- Biodiscovery Institute, School of Life Sciences, Nottingham University, Nottingham, UK
| | - Jess Tyson
- School of Life Sciences, University of Nottingham, Medical School, Queen's Medical Centre, Nottingham, UK
| | - Paul Radford
- School of Life Sciences, University of Nottingham, Medical School, Queen's Medical Centre, Nottingham, UK
| | - Asmaa Al-Bayati
- School of Life Sciences, University of Nottingham, Medical School, Queen's Medical Centre, Nottingham, UK
- Northern Technical University, Kirkuk, Iraq
| | - Samuel Greenwood
- School of Life Sciences, University of Nottingham, Medical School, Queen's Medical Centre, Nottingham, UK
| | - Emma J Banks
- School of Life Sciences, University of Nottingham, Medical School, Queen's Medical Centre, Nottingham, UK
- Department of Molecular Microbiology, John Innes Centre, Norwich, UK
| | - Callum Clark
- School of Life Sciences, University of Nottingham, Medical School, Queen's Medical Centre, Nottingham, UK
- Institute of Microbiology and Infection, University of Birmingham, Birmingham, UK
| | - Rob Till
- School of Life Sciences, University of Nottingham, Medical School, Queen's Medical Centre, Nottingham, UK
| | - Elisabete Pires
- Chemistry Research Laboratory, University of Oxford, Oxford, UK
| | - R Elizabeth Sockett
- School of Life Sciences, University of Nottingham, Medical School, Queen's Medical Centre, Nottingham, UK.
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4
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Hocher A, Laursen SP, Radford P, Tyson J, Lambert C, Stevens KM, Montoya A, Shliaha PV, Picardeau M, Sockett RE, Luger K, Warnecke T. Histones with an unconventional DNA-binding mode in vitro are major chromatin constituents in the bacterium Bdellovibrio bacteriovorus. Nat Microbiol 2023; 8:2006-2019. [PMID: 37814071 PMCID: PMC10627809 DOI: 10.1038/s41564-023-01492-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2023] [Accepted: 09/08/2023] [Indexed: 10/11/2023]
Abstract
Histone proteins bind DNA and organize the genomes of eukaryotes and most archaea, whereas bacteria rely on different nucleoid-associated proteins. Homology searches have detected putative histone-fold domains in a few bacteria, but whether these function like archaeal/eukaryotic histones is unknown. Here we report that histones are major chromatin components in the bacteria Bdellovibrio bacteriovorus and Leptospira interrogans. Patterns of sequence evolution suggest important roles for histones in additional bacterial clades. Crystal structures (<2.0 Å) of the B. bacteriovorus histone (Bd0055) dimer and the histone-DNA complex confirm conserved histone-fold topology but indicate a distinct DNA-binding mode. Unlike known histones in eukaryotes, archaea and viruses, Bd0055 binds DNA end-on, forming a sheath of dimers encasing straight DNA rather than wrapping DNA around their outer surface. Our results demonstrate that histones are present across the tree of life and highlight potential evolutionary innovation in how they associate with DNA.
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Affiliation(s)
- Antoine Hocher
- Medical Research Council London Institute of Medical Sciences, London, UK.
- Institute of Clinical Sciences, Faculty of Medicine, Imperial College London, London, UK.
| | - Shawn P Laursen
- Department of Molecular, Cellular, and Developmental Biology, University of Colorado Boulder, Boulder, CO, USA
| | - Paul Radford
- School of Life Sciences, Medical School, Queen's Medical Centre, University of Nottingham, Nottingham, UK
| | - Jess Tyson
- School of Life Sciences, Medical School, Queen's Medical Centre, University of Nottingham, Nottingham, UK
| | - Carey Lambert
- School of Life Sciences, Medical School, Queen's Medical Centre, University of Nottingham, Nottingham, UK
| | - Kathryn M Stevens
- Medical Research Council London Institute of Medical Sciences, London, UK
- Institute of Clinical Sciences, Faculty of Medicine, Imperial College London, London, UK
| | - Alex Montoya
- Medical Research Council London Institute of Medical Sciences, London, UK
- Institute of Clinical Sciences, Faculty of Medicine, Imperial College London, London, UK
| | - Pavel V Shliaha
- Medical Research Council London Institute of Medical Sciences, London, UK
- Institute of Clinical Sciences, Faculty of Medicine, Imperial College London, London, UK
| | - Mathieu Picardeau
- Institut Pasteur, Université Paris Cité, CNRS UMR 6047, Biology of Spirochetes Unit, Paris, France
| | - R Elizabeth Sockett
- School of Life Sciences, Medical School, Queen's Medical Centre, University of Nottingham, Nottingham, UK
| | - Karolin Luger
- Department of Biochemistry, University of Colorado Boulder, Boulder, CO, USA.
- Howard Hughes Medical Institute, Chevy Chase, MD, USA.
| | - Tobias Warnecke
- Medical Research Council London Institute of Medical Sciences, London, UK.
- Institute of Clinical Sciences, Faculty of Medicine, Imperial College London, London, UK.
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5
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Belluati A, Harley I, Lieberwirth I, Bruns N. An Outer Membrane-Inspired Polymer Coating Protects and Endows Escherichia coli with Novel Functionalities. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023; 19:e2303384. [PMID: 37452438 DOI: 10.1002/smll.202303384] [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: 04/25/2023] [Revised: 07/06/2023] [Indexed: 07/18/2023]
Abstract
A bio-inspired membrane made of Pluronic L-121 is produced around Escherichia coli thanks to the simple co-extrusion of bacteria and polymer vesicles. The block copolymer-coated bacteria can withstand various harsh shocks, for example, temperature, pressure, osmolarity, and chemical agents. The polymer membrane also makes the bacteria resistant to enzymatic digestion and enables them to degrade toxic compounds, improving their performance as whole-cell biocatalysts. Moreover, the polymer membrane acts as an anchor layer for the surface modification of the bacteria. Being decorated with α-amylase or lysozyme, the cells are endowed with the ability to digest starch or self-predatory bacteria are created. Thus, without any genetic engineering, the phenotype of encapsulated bacteria is changed as they become sturdier and gain novel metabolic functionalities.
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Affiliation(s)
- Andrea Belluati
- Department of Chemistry and Centre for Synthetic Biology, Technical University of Darmstadt, Peter-Grünberg-Straße 4, 64287, Darmstadt, Germany
- Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow, G1 1XL, UK
| | - Iain Harley
- Department of Physical Chemistry of Polymers, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Ingo Lieberwirth
- Department of Physical Chemistry of Polymers, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Nico Bruns
- Department of Chemistry and Centre for Synthetic Biology, Technical University of Darmstadt, Peter-Grünberg-Straße 4, 64287, Darmstadt, Germany
- Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow, G1 1XL, UK
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6
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Garner RE, Kraemer SA, Onana VE, Fradette M, Varin MP, Huot Y, Walsh DA. A genome catalogue of lake bacterial diversity and its drivers at continental scale. Nat Microbiol 2023; 8:1920-1934. [PMID: 37524802 DOI: 10.1038/s41564-023-01435-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2022] [Accepted: 06/20/2023] [Indexed: 08/02/2023]
Abstract
Lakes are heterogeneous ecosystems inhabited by a rich microbiome whose genomic diversity is poorly defined. We present a continental-scale study of metagenomes representing 6.5 million km2 of the most lake-rich landscape on Earth. Analysis of 308 Canadian lakes resulted in a metagenome-assembled genome (MAG) catalogue of 1,008 mostly novel bacterial genomospecies. Lake trophic state was a leading driver of taxonomic and functional diversity among MAG assemblages, reflecting the responses of communities profiled by 16S rRNA amplicons and gene-centric metagenomics. Coupling the MAG catalogue with watershed geomatics revealed terrestrial influences of soils and land use on assemblages. Agriculture and human population density were drivers of turnover, indicating detectable anthropogenic imprints on lake bacteria at the continental scale. The sensitivity of bacterial assemblages to human impact reinforces lakes as sentinels of environmental change. Overall, the LakePulse MAG catalogue greatly expands the freshwater genomic landscape, advancing an integrative view of diversity across Earth's microbiomes.
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Affiliation(s)
- Rebecca E Garner
- Department of Biology, Concordia University, Montreal, Quebec, Canada
- Groupe de recherche interuniversitaire en limnologie, Montreal, Quebec, Canada
| | | | - Vera E Onana
- Department of Biology, Concordia University, Montreal, Quebec, Canada
- Groupe de recherche interuniversitaire en limnologie, Montreal, Quebec, Canada
| | - Maxime Fradette
- Département de géomatique appliquée, Université de Sherbrooke, Sherbrooke, Quebec, Canada
| | - Marie-Pierre Varin
- Département de géomatique appliquée, Université de Sherbrooke, Sherbrooke, Quebec, Canada
| | - Yannick Huot
- Groupe de recherche interuniversitaire en limnologie, Montreal, Quebec, Canada
- Département de géomatique appliquée, Université de Sherbrooke, Sherbrooke, Quebec, Canada
| | - David A Walsh
- Department of Biology, Concordia University, Montreal, Quebec, Canada.
- Groupe de recherche interuniversitaire en limnologie, Montreal, Quebec, Canada.
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7
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Jordan CKI, Brown RL, Larkinson MLY, Sequeira RP, Edwards AM, Clarke TB. Symbiotic Firmicutes establish mutualism with the host via innate tolerance and resistance to control systemic immunity. Cell Host Microbe 2023; 31:1433-1449.e9. [PMID: 37582375 DOI: 10.1016/j.chom.2023.07.008] [Citation(s) in RCA: 16] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Revised: 05/12/2023] [Accepted: 07/18/2023] [Indexed: 08/17/2023]
Abstract
The intestinal microbiota regulates immunity across organ systems. Which symbionts control systemic immunity, the mechanisms they use, and how they avoid widespread inflammatory damage are unclear. We uncover host tolerance and resistance mechanisms that allow Firmicutes from the human microbiota to control systemic immunity without inducing immunopathology. Intestinal processing releases Firmicute glycoconjugates that disseminate, resulting in release of cytokine IL-34 that stimulates macrophages and enhances defenses against pneumonia, sepsis, and meningitis. Despite systemic penetration of Firmicutes, immune homeostasis is maintained through feedback control whereby IL-34-mediated mTORC1 activation in macrophages clears polymeric glycoconjugates from peripheral tissues. Smaller glycoconjugates evading this clearance mechanism are tolerated through sequestration by albumin, which acts as an inflammatory buffer constraining their immunological impact. Without these resistance and tolerance mechanisms, Firmicutes drive catastrophic organ damage and cachexia via IL-1β. This reveals how Firmicutes are safely assimilated into systemic immunity to protect against infection without threatening host viability.
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Affiliation(s)
- Christine K I Jordan
- Centre for Bacterial Resistance Biology, Department of Infectious Disease, Imperial College London, London SW7 2AZ, UK
| | - Rebecca L Brown
- Centre for Bacterial Resistance Biology, Department of Infectious Disease, Imperial College London, London SW7 2AZ, UK
| | - Max L Y Larkinson
- Centre for Bacterial Resistance Biology, Department of Infectious Disease, Imperial College London, London SW7 2AZ, UK
| | - Richard P Sequeira
- Centre for Bacterial Resistance Biology, Department of Infectious Disease, Imperial College London, London SW7 2AZ, UK
| | - Andrew M Edwards
- Centre for Bacterial Resistance Biology, Department of Infectious Disease, Imperial College London, London SW7 2AZ, UK
| | - Thomas B Clarke
- Centre for Bacterial Resistance Biology, Department of Infectious Disease, Imperial College London, London SW7 2AZ, UK.
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8
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Kaljević J, Tesseur C, Le TBK, Laloux G. Cell cycle-dependent organization of a bacterial centromere through multi-layered regulation of the ParABS system. PLoS Genet 2023; 19:e1010951. [PMID: 37733798 PMCID: PMC10547168 DOI: 10.1371/journal.pgen.1010951] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Revised: 10/03/2023] [Accepted: 09/01/2023] [Indexed: 09/23/2023] Open
Abstract
The accurate distribution of genetic material is crucial for all organisms. In most bacteria, chromosome segregation is achieved by the ParABS system, in which the ParB-bound parS sequence is actively partitioned by ParA. While this system is highly conserved, its adaptation in organisms with unique lifestyles and its regulation between developmental stages remain largely unexplored. Bdellovibrio bacteriovorus is a predatory bacterium proliferating through polyploid replication and non-binary division inside other bacteria. Our study reveals the subcellular dynamics and multi-layered regulation of the ParABS system, coupled to the cell cycle of B. bacteriovorus. We found that ParA:ParB ratios fluctuate between predation stages, their balance being critical for cell cycle progression. Moreover, the parS chromosomal context in non-replicative cells, combined with ParB depletion at cell division, critically contribute to the unique cell cycle-dependent organization of the centromere in this bacterium, highlighting new levels of complexity in chromosome segregation and cell cycle control.
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Affiliation(s)
| | | | - Tung B. K. Le
- John Innes Centre, Department of Molecular Microbiology, Norwich, United Kingdom
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9
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Caulton SG, Lovering AL. Moving toward a better understanding of the model bacterial predator Bdellovibrio bacteriovorus. MICROBIOLOGY (READING, ENGLAND) 2023; 169:001380. [PMID: 37535060 PMCID: PMC10482364 DOI: 10.1099/mic.0.001380] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Accepted: 07/27/2023] [Indexed: 08/04/2023]
Abstract
The bacterial predator Bdellovibrio bacteriovorus is a model for the wider phenomenon of bacteria:bacteria predation, and the specialization required to achieve a lifestyle dependent on prey consumption. Bdellovibrio bacteriovorus is able to recognize, enter and ultimately consume fellow Gram-negative bacteria, killing these prey from within their periplasmic space, and lysing the host at the end of the cycle. The classic phenotype-driven characterization (and observation of predation) has benefitted from an increased focus on molecular mechanisms and fluorescence microscopy and tomography, revealing new features of several of the lifecycle stages. Herein we summarize a selection of these advances and describe likely areas for exploration that will push the field toward a more complete understanding of this fascinating 'two-cell' system.
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Affiliation(s)
- Simon G. Caulton
- School of Biosciences, University of Birmingham, Birmingham B15 2TT, UK
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10
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Kaplan M, Chang YW, Oikonomou CM, Nicolas WJ, Jewett AI, Kreida S, Dutka P, Rettberg LA, Maggi S, Jensen GJ. Bdellovibrio predation cycle characterized at nanometre-scale resolution with cryo-electron tomography. Nat Microbiol 2023; 8:1267-1279. [PMID: 37349588 PMCID: PMC11061892 DOI: 10.1038/s41564-023-01401-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Accepted: 04/27/2023] [Indexed: 06/24/2023]
Abstract
Bdellovibrio bacteriovorus is a microbial predator that offers promise as a living antibiotic for its ability to kill Gram-negative bacteria, including human pathogens. Even after six decades of study, fundamental details of its predation cycle remain mysterious. Here we used cryo-electron tomography to comprehensively image the lifecycle of B. bacteriovorus at nanometre-scale resolution. With high-resolution images of predation in a native (hydrated, unstained) state, we discover several surprising features of the process, including macromolecular complexes involved in prey attachment/invasion and a flexible portal structure lining a hole in the prey peptidoglycan that tightly seals the prey outer membrane around the predator during entry. Unexpectedly, we find that B. bacteriovorus does not shed its flagellum during invasion, but rather resorbs it into its periplasm for degradation. Finally, following growth and division in the bdelloplast, we observe a transient and extensive ribosomal lattice on the condensed B. bacteriovorus nucleoid.
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Affiliation(s)
- Mohammed Kaplan
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, USA.
- Department of Microbiology, University of Chicago, Chicago, IL, USA.
| | - Yi-Wei Chang
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, USA
- Department of Biochemistry and Biophysics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Catherine M Oikonomou
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, USA
| | - William J Nicolas
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, USA
| | - Andrew I Jewett
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA, USA
| | - Stefan Kreida
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, USA
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institute, Solna, Sweden
| | - Przemysław Dutka
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, USA
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA, USA
| | | | - Stefano Maggi
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, USA
| | - Grant J Jensen
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, USA.
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT, USA.
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11
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Sockett RE. Learning with Bdellovibrio. Nat Microbiol 2023:10.1038/s41564-023-01417-8. [PMID: 37391456 DOI: 10.1038/s41564-023-01417-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/02/2023]
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12
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Lai TF, Ford RM, Huwiler SG. Advances in cellular and molecular predatory biology of Bdellovibrio bacteriovorus six decades after discovery. Front Microbiol 2023; 14:1168709. [PMID: 37256055 PMCID: PMC10225642 DOI: 10.3389/fmicb.2023.1168709] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2023] [Accepted: 04/14/2023] [Indexed: 06/01/2023] Open
Abstract
Since its discovery six decades ago, the predatory bacterium Bdellovibrio bacteriovorus has sparked recent interest as a potential remedy to the antibiotic resistance crisis. Here we give a comprehensive historical overview from discovery to progressive developments in microscopy and molecular mechanisms. Research on B. bacteriovorus has moved from curiosity to a new model organism, revealing over time more details on its physiology and fascinating predatory life cycle with the help of a variety of methods. Based on recent findings in cryo-electron tomography, we recapitulate on the intricate molecular details known in the predatory life cycle including how this predator searches for its prey bacterium, to how it attaches, grows, and divides all from within the prey cell. Finally, the newly developed B. bacteriovorus progeny leave the prey cell remnants in the exit phase. While we end with some unanswered questions remaining in the field, new imaging technologies and quantitative, systematic advances will likely help to unravel them in the next decades.
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Affiliation(s)
- Ting F. Lai
- Department of Plant and Microbial Biology, University of Zurich, Zurich, Switzerland
| | - Rhian M. Ford
- School of Biosciences, University of Nottingham, Loughborough, United Kingdom
| | - Simona G. Huwiler
- Department of Plant and Microbial Biology, University of Zurich, Zurich, Switzerland
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13
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Santin YG, Lamot T, van Raaphorst R, Kaljević J, Laloux G. Modulation of prey size reveals adaptability and robustness in the cell cycle of an intracellular predator. Curr Biol 2023:S0960-9822(23)00541-9. [PMID: 37207648 DOI: 10.1016/j.cub.2023.04.059] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2023] [Revised: 04/14/2023] [Accepted: 04/25/2023] [Indexed: 05/21/2023]
Abstract
Despite a remarkable diversity of lifestyles, bacterial replication has only been investigated in a few model species. In bacteria that do not rely on canonical binary division for proliferation, the coordination of major cellular processes is still largely mysterious. Moreover, the dynamics of bacterial growth and division remain unexplored within spatially confined niches where nutrients are limited. This includes the life cycle of the model endobiotic predatory bacterium Bdellovibrio bacteriovorus, which grows by filamentation within its prey and produces a variable number of daughter cells. Here, we examined the impact of the micro-compartment in which predators replicate (i.e., the prey bacterium) on their cell-cycle progression at the single-cell level. Using Escherichia coli with genetically encoded size differences, we show that the duration of the predator cell cycle scales with prey size. Consequently, prey size determines predator offspring numbers. We found that individual predators elongate exponentially, with a growth rate determined by the nutritional quality of the prey, irrespective of prey size. However, the size of newborn predator cells is remarkably stable across prey nutritional content and size variations. Tuning the predatory cell cycle by modulating prey dimensions also allowed us to reveal invariable temporal connections between key cellular processes. Altogether, our data imply adaptability and robustness shaping the enclosed cell-cycle progression of B. bacteriovorus, which might contribute to optimal exploitation of the finite resources and space in their prey. This study extends the characterization of cell cycle control strategies and growth patterns beyond canonical models and lifestyles.
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Affiliation(s)
- Yoann G Santin
- de Duve Institute, UCLouvain, 75 avenue Hippocrate, 1200 Brussels, Belgium
| | - Thomas Lamot
- de Duve Institute, UCLouvain, 75 avenue Hippocrate, 1200 Brussels, Belgium
| | | | - Jovana Kaljević
- de Duve Institute, UCLouvain, 75 avenue Hippocrate, 1200 Brussels, Belgium
| | - Géraldine Laloux
- de Duve Institute, UCLouvain, 75 avenue Hippocrate, 1200 Brussels, Belgium.
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14
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Song J, Yu C, Ma F, Lin R, Gao L, Yan Y, Wu Y. Design of molecularly imprinted nanocomposite membrane for selective separation of lysozyme based on double-faced self-assembly strategy. Sep Purif Technol 2023. [DOI: 10.1016/j.seppur.2022.122941] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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15
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Wu F, Ma J, Wang Y, Xie L, Yan X, Shi L, Li Y, Liu Y. Single Copper Atom Photocatalyst Powers an Integrated Catalytic Cascade for Drug-Resistant Bacteria Elimination. ACS NANO 2023; 17:2980-2991. [PMID: 36695402 DOI: 10.1021/acsnano.2c11550] [Citation(s) in RCA: 20] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
To address the issue posed by drug-resistant bacteria and inspired by natural antimicrobial enzymes, we report the atomically doped copper on guanine-derived nanosheets (G-Cu) that possess the integrated catalytic cascade property of glucose oxidase and peroxidase, yielding free radicals to eliminate drug-resistant bacteria upon light irradiation. Density functional theory calculations demonstrate that copper could notably promote oxygen activation and H2O2 splitting on the G-Cu complexes. Further all-atom simulation and experimental data indicate that the lysis of bacteria is mainly induced by cell membrane damage and the elevation of intracellular reactive oxygen species. Lastly, the G-Cu complexes efficiently eliminate the staphylococci in the infected wounds and accelerate their closure in a murine model, with negligible side effects on the normal tissues. Therefore, our G-Cu complexes may provide an efficient nonantibiotic alternative to the current treatments for bacterial infections.
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Affiliation(s)
- Fan Wu
- Wenzhou Institute, University of Chinese Academy of Sciences; Key Laboratory of Clinical Laboratory Diagnosis and Translational Research of Zhejiang Province, the First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang325001, China
| | - Jinghang Ma
- Department of Gynecology, the First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang325035, China
| | - Yang Wang
- Wenzhou Institute, University of Chinese Academy of Sciences; Key Laboratory of Clinical Laboratory Diagnosis and Translational Research of Zhejiang Province, the First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang325001, China
| | - Lingping Xie
- Department of Gynecology, the First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang325035, China
| | - Xiaojian Yan
- Department of Gynecology, the First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang325035, China
| | - Linqi Shi
- Key Laboratory of Functional Polymer Materials of Ministry of Education, Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin300071, China
| | - Yuanfeng Li
- Translational Medicine Laboratory, the First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang325035, China
| | - Yong Liu
- Wenzhou Institute, University of Chinese Academy of Sciences; Key Laboratory of Clinical Laboratory Diagnosis and Translational Research of Zhejiang Province, the First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang325001, China
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16
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Parallel Evolution in Predatory Bdellovibrio sp. NC01 during Long-Term Coculture with a Single Prey Strain. Appl Environ Microbiol 2023; 89:e0177622. [PMID: 36598482 PMCID: PMC9888234 DOI: 10.1128/aem.01776-22] [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] [Indexed: 01/05/2023] Open
Abstract
Experimental evolution provides a powerful tool for examining how Bdellovibrio evolves in response to unique selective pressures associated with its predatory lifestyle. We tested how Bdellovibrio sp. NC01 adapts to long-term coculture with Pseudomonas sp. NC02, which is less susceptible to predation compared to other Gram-negative bacteria. Analyzing six replicate Bdellovibrio populations across six time points spanning 40 passages and 2,880 h of coculture, we detected 30 to 40 new mutations in each population that exceeded a frequency of 5%. Nonsynonymous substitutions were the most abundant type of new mutation, followed by small indels and synonymous substitutions. After completing the final passage, we detected 20 high-frequency (>75%) mutations across all six evolved Bdellovibrio populations. Eighteen of these alter protein sequences, and most increased in frequency rapidly. Four genes acquired a high-frequency mutation in two or more evolved Bdellovibrio populations, reflecting parallel evolution and positive selection. The genes encode a sodium/phosphate cotransporter family protein (Bd2221), a metallophosphoesterase (Bd0054), a TonB family protein (Bd0396), and a hypothetical protein (Bd1601). Tested prey range and predation efficiency phenotypes did not differ significantly between evolved Bdellovibrio populations and the ancestor; however, all six evolved Bdellovibrio populations demonstrated enhanced starvation survival compared to the ancestor. These results suggest that, instead of evolving improved killing of Pseudomonas sp. NC02, Bdellovibrio evolved to better withstand nutrient limitation in the presence of this prey strain. The mutations identified here point to genes and functions that may be important for Bdellovibrio adaptation to the different selective pressures of long-term coculture with Pseudomonas. IMPORTANCE Bdellovibrio attack and kill Gram-negative bacteria, including drug-resistant pathogens of animals and plants. This lifestyle is unusual among bacteria, and it imposes unique selective pressures on Bdellovibrio. Determining how Bdellovibrio evolve in response to these pressures is valuable for understanding the mechanisms that govern predation. We applied experimental evolution to test how Bdellovibrio sp. NC01 evolved in response to long-term coculture with a single Pseudomonas strain, which NC01 can kill, but with low efficiency. Our experimental design imposed different selective pressures on the predatory bacteria and tracked the evolutionary trajectories of replicate Bdellovibrio populations. Using genome sequencing, we identified Bdellovibrio genes that acquired high-frequency mutations in two or more populations. Using phenotype assays, we determined that evolved Bdellovibrio populations did not improve their ability to kill Pseudomonas, but rather are better able to survive starvation. Overall, our results point to functions that may be important for Bdellovibrio adaptation.
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17
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Song Y, Zhang H, Zhu Y, Zhao X, Lei Y, Zhou W, Yu J, Dong X, Wang X, Du M, Yan H. Lysozyme Protects Against Severe Acute Respiratory Syndrome Coronavirus 2 Infection and Inflammation in Human Corneal Epithelial Cells. Invest Ophthalmol Vis Sci 2022; 63:16. [PMID: 35713893 PMCID: PMC9206495 DOI: 10.1167/iovs.63.6.16] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
Purpose The purpose of this study was to investigate the effects of lysozyme, an antimicrobial enzyme found in tears that protects the eye against pathogens, on pseudotyped severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection through corneal epithelial cells. Methods The expression of the angiotensin-converting enzyme 2 (ACE2) and transmembrane serine protease (TMPRSS2) in human corneal epithelial cells (HCECs) was measured by RT-PCR and Western blotting. The altered expression of the pro-inflammatory molecules induced by spike protein and lysozyme was analyzed by RT-PCR. Cell toxicity was tested by CCK8 assay. The cell entry of SAR-CoV-2 in HCECs and primary rabbit corneal epithelial cells (RbCECs) was detected by luciferase assay. Results ACE2 and TMPRSS2 were highly expressed in HCECs. The spike proteins of SARS-CoV-2 stimulated a robust inflammatory response in HCECs, characterized by increased secretion of pro-inflammatory molecules, including IL-6, TNF-α, iNOS, and MCP-1, and pretreatment with lysozyme in HCECs markedly decreased the production of proinflammatory molecules induced by spike proteins. In addition, the inflammatory cytokine TNF-α enhanced the entry of SARS-CoV-2 into HCECs, which can be mitigated by pretreatment with lysozyme. Conclusions In this study, we analyzed the susceptibility of human corneal epithelial cells to SARS-CoV-2 infection and suggested the protective effects of lysozyme on SARS-CoV-2 infection.
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Affiliation(s)
- Yinting Song
- Department of Ophthalmology, Tianjin Medical University General Hospital, Tianjin, China.,Laboratory of Molecular Ophthalmology, Department of Pharmacology and Tianjin Key Laboratory of Inflammation Biology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, China
| | - Haokun Zhang
- Department of Ophthalmology, Tianjin Medical University General Hospital, Tianjin, China.,Laboratory of Molecular Ophthalmology, Department of Pharmacology and Tianjin Key Laboratory of Inflammation Biology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, China
| | - Yanfang Zhu
- Department of Ophthalmology, Tianjin Medical University General Hospital, Tianjin, China
| | - Xiao Zhao
- Department of Ophthalmology, Tianjin Medical University General Hospital, Tianjin, China.,Laboratory of Molecular Ophthalmology, Department of Pharmacology and Tianjin Key Laboratory of Inflammation Biology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, China
| | - Yi Lei
- Department of Ophthalmology, Tianjin Medical University General Hospital, Tianjin, China.,Laboratory of Molecular Ophthalmology, Department of Pharmacology and Tianjin Key Laboratory of Inflammation Biology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, China
| | - Wei Zhou
- Department of Ophthalmology, Tianjin Medical University General Hospital, Tianjin, China
| | - Jinguo Yu
- Department of Ophthalmology, Tianjin Medical University General Hospital, Tianjin, China
| | - Xue Dong
- Department of Ophthalmology, Tianjin Medical University General Hospital, Tianjin, China.,Laboratory of Molecular Ophthalmology, Department of Pharmacology and Tianjin Key Laboratory of Inflammation Biology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, China
| | - Xiaohong Wang
- Laboratory of Molecular Ophthalmology, Department of Pharmacology and Tianjin Key Laboratory of Inflammation Biology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, China
| | - Mei Du
- Laboratory of Molecular Ophthalmology, Department of Pharmacology and Tianjin Key Laboratory of Inflammation Biology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, China
| | - Hua Yan
- Department of Ophthalmology, Tianjin Medical University General Hospital, Tianjin, China.,Laboratory of Molecular Ophthalmology, Department of Pharmacology and Tianjin Key Laboratory of Inflammation Biology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, China
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18
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Li Q, Zhou Y, Lu R, Zheng P, Wang Y. Phylogeny, distribution and potential metabolism of candidate bacterial phylum KSB1. PeerJ 2022; 10:e13241. [PMID: 35433121 PMCID: PMC9012183 DOI: 10.7717/peerj.13241] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2021] [Accepted: 03/18/2022] [Indexed: 01/13/2023] Open
Abstract
Candidate phylum KSB1 is composed of uncultured bacteria and has been reported across various environments. However, the phylogeny and metabolic potential of KSB1 have not been studied comprehensively. In this study, phylogenomic analysis of KSB1 genomes from public databases and eleven metagenome-assembled genomes (MAGs) from marine and hydrothermal sediments revealed that those genomes were clustered into four clades. Isolation source and relative abundance of KSB1 genomes showed that clade I was particularly abundant in bioreactor sludge. Genes related to dissimilatory reduction of nitrate to ammonia (DNRA), the last step of denitrification converting nitrous oxide to nitrogen and assimilatory sulfur reduction were observed in the expanded genomes of clade I, which may due to horizontal gene transfer that frequently occurred in bioreactor. Annotation and metabolic reconstruction of clades II and IV showed flagellum assembly and chemotaxis genes in the genomes, which may indicate that exploration and sensing for nutrients and chemical gradients are critical for the two clades in deep-sea and hydrothermal sediment. Metabolic potentials of fatty acids and short-chain hydrocarbons utilization were predicted in clades I and IV of KSB1. Collectively, phylogenomic and metabolic analyses of KSB1 clades provide insight into their anaerobic heterotrophic lifestyle and differentiation in potential ecological roles.
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Affiliation(s)
- Qingmei Li
- Institute of Deep Sea Science and Engineering, Chinese Academy of Sciences, Sanya, China,University of Chinese Academy of Sciences, Beijing, China
| | - Yingli Zhou
- Institute of Deep Sea Science and Engineering, Chinese Academy of Sciences, Sanya, China,University of Chinese Academy of Sciences, Beijing, China
| | - Rui Lu
- Institute of Deep Sea Science and Engineering, Chinese Academy of Sciences, Sanya, China,University of Chinese Academy of Sciences, Beijing, China
| | - Pengfei Zheng
- Institute of Deep Sea Science and Engineering, Chinese Academy of Sciences, Sanya, China
| | - Yong Wang
- Institute of Deep Sea Science and Engineering, Chinese Academy of Sciences, Sanya, China,Institute for Marine Engineering, Shenzhen International Graduate School, Tsinghua University, Shenzhen, China
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19
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Yang Z, Fu X, Ma D, Wang Y, Peng L, Shi J, Sun J, Gan X, Deng Y, Yang W. Growth Factor-Decorated Ti 3 C 2 MXene/MoS 2 2D Bio-Heterojunctions with Quad-Channel Photonic Disinfection for Effective Regeneration of Bacteria-Invaded Cutaneous Tissue. SMALL 2021; 17:e2103993. [PMID: 34713567 DOI: 10.1002/smll.202103993] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2021] [Revised: 08/23/2021] [Indexed: 02/05/2023]
Abstract
Phototherapy has recently emerged as a competent alternative for combating bacterial infection without antibiotic-resistance risk. However, owing to the bacterial endogenous antioxidative glutathione (GSH), the exogenous reactive oxygen species (ROS) generated by phototherapy can hardly behave desired antibacterial effect. To address the daunting issue, a quad-channel synergistic antibacterial nano-platform of Ti3 C2 MXene/MoS2 (MM) 2D bio-heterojunctions (2D bio-HJs) are devised and fabricated, which possess photothermal, photodynamic, peroxidase-like (POD-like), and glutathione oxidase-like properties. Under near-infrared (NIR) laser exposure, the 2D bio-HJs both yield localized heating and raise extracellular ROS level, leading to bacterial inactivation. Synchronously, Mo4+ ions can easily invade into ruptured bacterial membrane, arouse intracellular ROS, and deplete intracellular GSH. Squeezed between the "ROS hurricane" from both internal and external sides, the bacteria are hugely slaughtered. After being further loaded with fibroblast growth factor-21 (FGF21), the 2D bio-HJs exhibit benign cytocompatibility and boost cell migration in vitro. Notably, the in vivo evaluations employing a mouse-infected wound model demonstrate the excellent photonic disinfection towards bacterial infection and accelerated wound healing. Overall, this work provides a powerful nano-platform for the effective regeneration of bacteria-invaded cutaneous tissue using 2D bio-HJs.
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Affiliation(s)
- Zhaopu Yang
- College of Biomedical Engineering, West China School of Stomatology, School of Chemical Engineering, Sichuan University, Chengdu, 610065, China
| | - Xinliang Fu
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, 610041, China
| | - Daichuan Ma
- Analytical & Testing Center, Sichuan University, Chengdu, 610065, China
| | - Yulin Wang
- College of Biomedical Engineering, West China School of Stomatology, School of Chemical Engineering, Sichuan University, Chengdu, 610065, China
| | - Liming Peng
- College of Biomedical Engineering, West China School of Stomatology, School of Chemical Engineering, Sichuan University, Chengdu, 610065, China
| | - Jiacheng Shi
- College of Biomedical Engineering, West China School of Stomatology, School of Chemical Engineering, Sichuan University, Chengdu, 610065, China
| | - Jiyu Sun
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, 610041, China
| | - Xueqi Gan
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, 610041, China
| | - Yi Deng
- College of Biomedical Engineering, West China School of Stomatology, School of Chemical Engineering, Sichuan University, Chengdu, 610065, China.,Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, SAR, 999077, China
| | - Weizhong Yang
- College of Biomedical Engineering, West China School of Stomatology, School of Chemical Engineering, Sichuan University, Chengdu, 610065, China
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20
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Seef S, Herrou J, de Boissier P, My L, Brasseur G, Robert D, Jain R, Mercier R, Cascales E, Habermann BH, Mignot T. A Tad-like apparatus is required for contact-dependent prey killing in predatory social bacteria. eLife 2021; 10:72409. [PMID: 34505573 PMCID: PMC8460266 DOI: 10.7554/elife.72409] [Citation(s) in RCA: 36] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2021] [Accepted: 09/09/2021] [Indexed: 12/21/2022] Open
Abstract
Myxococcus xanthus, a soil bacterium, predates collectively using motility to invade prey colonies. Prey lysis is mostly thought to rely on secreted factors, cocktails of antibiotics and enzymes, and direct contact with Myxococcus cells. In this study, we show that on surfaces the coupling of A-motility and contact-dependent killing is the central predatory mechanism driving effective prey colony invasion and consumption. At the molecular level, contact-dependent killing involves a newly discovered type IV filament-like machinery (Kil) that both promotes motility arrest and prey cell plasmolysis. In this process, Kil proteins assemble at the predator-prey contact site, suggesting that they allow tight contact with prey cells for their intoxication. Kil-like systems form a new class of Tad-like machineries in predatory bacteria, suggesting a conserved function in predator-prey interactions. This study further reveals a novel cell-cell interaction function for bacterial pili-like assemblages.
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Affiliation(s)
- Sofiene Seef
- Aix-Marseille Université - CNRS UMR 7283, Institut de Microbiologie de la Méditerranée and Turing Center for Living Systems, Marseille, France
| | - Julien Herrou
- Aix-Marseille Université - CNRS UMR 7283, Institut de Microbiologie de la Méditerranée and Turing Center for Living Systems, Marseille, France
| | - Paul de Boissier
- Aix-Marseille Université - CNRS UMR 7288, Institut de Biologie du Développement de Marseille and Turing Center for Living Systems, Marseille, France
| | - Laetitia My
- Aix-Marseille Université - CNRS UMR 7283, Institut de Microbiologie de la Méditerranée and Turing Center for Living Systems, Marseille, France
| | - Gael Brasseur
- Aix-Marseille Université - CNRS UMR 7283, Institut de Microbiologie de la Méditerranée and Turing Center for Living Systems, Marseille, France
| | - Donovan Robert
- Aix-Marseille Université - CNRS UMR 7283, Institut de Microbiologie de la Méditerranée and Turing Center for Living Systems, Marseille, France
| | - Rikesh Jain
- Aix-Marseille Université - CNRS UMR 7283, Institut de Microbiologie de la Méditerranée and Turing Center for Living Systems, Marseille, France.,Aix-Marseille Université - CNRS UMR 7288, Institut de Biologie du Développement de Marseille and Turing Center for Living Systems, Marseille, France
| | - Romain Mercier
- Aix-Marseille Université - CNRS UMR 7283, Institut de Microbiologie de la Méditerranée and Turing Center for Living Systems, Marseille, France
| | - Eric Cascales
- Aix-Marseille Université - CNRS UMR 7255, Institut de Microbiologie de la Méditerranée, Marseille, France
| | - Bianca H Habermann
- Aix-Marseille Université - CNRS UMR 7288, Institut de Biologie du Développement de Marseille and Turing Center for Living Systems, Marseille, France
| | - Tâm Mignot
- Aix-Marseille Université - CNRS UMR 7283, Institut de Microbiologie de la Méditerranée and Turing Center for Living Systems, Marseille, France
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21
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Kaljević J, Saaki TNV, Govers SK, Remy O, van Raaphorst R, Lamot T, Laloux G. Chromosome choreography during the non-binary cell cycle of a predatory bacterium. Curr Biol 2021; 31:3707-3720.e5. [PMID: 34256020 PMCID: PMC8445325 DOI: 10.1016/j.cub.2021.06.024] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Revised: 05/13/2021] [Accepted: 06/09/2021] [Indexed: 12/03/2022]
Abstract
In bacteria, the dynamics of chromosome replication and segregation are tightly coordinated with cell-cycle progression and largely rely on specific spatiotemporal arrangement of the chromosome. Whereas these key processes are mostly investigated in species that divide by binary fission, they remain mysterious in bacteria producing larger number of descendants. Here, we establish the predatory bacterium Bdellovibrio bacteriovorus as a model to investigate the non-binary processing of a circular chromosome. We found that its single chromosome is highly compacted in a polarized nucleoid that excludes freely diffusing proteins during the non-proliferative stage of the cell cycle. A binary-like cycle of DNA replication and asymmetric segregation is followed by multiple asynchronous rounds of replication and progressive ParABS-dependent partitioning, uncoupled from cell division. Finally, we provide the first evidence for an on-off behavior of the ParB protein, which localizes at the centromere in a cell-cycle-regulated manner. Altogether, our findings support a model of complex chromosome choreography leading to the generation of variable, odd, or even numbers of offspring and highlight the adaptation of conserved mechanisms to achieve non-binary reproduction. The Bdellovibrio chromosome is polarized, with ori located near the invasive pole The highly compacted nucleoid excludes cytosolic proteins in non-replicative cells Replication and segregation of chromosomes are uncoupled from cell division The centromeric protein ParB localizes at parS in a cell-cycle-dependent manner
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Affiliation(s)
- Jovana Kaljević
- de Duve Institute, UCLouvain, 75 Avenue Hippocrate, 1200 Brussels, Belgium
| | - Terrens N V Saaki
- de Duve Institute, UCLouvain, 75 Avenue Hippocrate, 1200 Brussels, Belgium
| | - Sander K Govers
- de Duve Institute, UCLouvain, 75 Avenue Hippocrate, 1200 Brussels, Belgium; Howard Hughes Medical Institute, Stanford University, Stanford, CA 94305, USA
| | - Ophélie Remy
- de Duve Institute, UCLouvain, 75 Avenue Hippocrate, 1200 Brussels, Belgium
| | | | - Thomas Lamot
- de Duve Institute, UCLouvain, 75 Avenue Hippocrate, 1200 Brussels, Belgium
| | - Géraldine Laloux
- de Duve Institute, UCLouvain, 75 Avenue Hippocrate, 1200 Brussels, Belgium.
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22
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Page JE, Walker S. Natural products that target the cell envelope. Curr Opin Microbiol 2021; 61:16-24. [PMID: 33662818 PMCID: PMC8169544 DOI: 10.1016/j.mib.2021.02.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2020] [Revised: 01/22/2021] [Accepted: 02/03/2021] [Indexed: 02/07/2023]
Abstract
The inexorable spread of resistance to clinically used drugs demands that we maintain a full pipeline of antibiotic candidates. As organisms have struggled to survive and compete over evolutionary history, they have developed the capacity to make a remarkably diverse array of natural products that target the cell envelope. A few have been developed for use in the clinic but most have not, and there are still an enormous number of opportunities to investigate. Substrate-binding antibiotics for Gram-positive organisms, phage-derived lysins, and outer membrane protein-targeting agents for Gram-negative organisms represent promising avenues where nature's gifts may be repurposed for use in the clinic.
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Affiliation(s)
- Julia E Page
- Department of Microbiology, Harvard Medical School, HIM1013, 4 Blackfan Circle, Boston, MA, 02115, United States
| | - Suzanne Walker
- Department of Microbiology, Harvard Medical School, HIM1013, 4 Blackfan Circle, Boston, MA, 02115, United States.
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23
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Bauer A, Forchhammer K. Bacterial Predation on Cyanobacteria. Microb Physiol 2021; 31:99-108. [PMID: 34010833 DOI: 10.1159/000516427] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Accepted: 04/07/2021] [Indexed: 11/19/2022]
Abstract
Predatory bacteria gained interest in the last 20 years. Nevertheless, only a few species are well characterized. The endobiotic predator Bdellovibrio bacteriovorus invades its prey to consume it from the inside, whereas Myxococcus xanthus hunts as a whole group to overcome its prey. Both species were described to prey on cyanobacteria as well. This minireview summarizes the findings of the last 20 years of predatory bacteria of cyanobacteria and is supplemented by new findings from a screening experiment for bacterial predators of the model organism Anabaena variabilis PCC 7937. Known predatory bacteria of cyanobacteria belong to the phyla Proteobacteria, Bacteroidetes, and Firmicutes and follow different hunting strategies. The underlying mechanisms are in most cases not known in much detail. Isolates from the screening experiment were clustered after predation behaviour and analyzed with respect to their size. The effect of predation in high nitrate levels and the occurrence of nitrogen-fixing cells, called heterocysts, are addressed.
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Affiliation(s)
- Antje Bauer
- Interfaculty Institute of Microbiology and Infection Medicine, Eberhard Karls Universität, Tübingen, Germany
| | - Karl Forchhammer
- Interfaculty Institute of Microbiology and Infection Medicine, Eberhard Karls Universität, Tübingen, Germany
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24
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Waso M, Reyneke B, Havenga B, Khan S, Khan W. Insights into Bdellovibrio spp. mechanisms of action and potential applications. World J Microbiol Biotechnol 2021; 37:85. [PMID: 33860852 DOI: 10.1007/s11274-021-03054-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Accepted: 04/09/2021] [Indexed: 11/28/2022]
Abstract
Recent studies investigating Bdellovibrio spp. have found that although this predator predominantly preys on Gram-negative organisms, under certain conditions (nutrient/prey limitation), it will adapt to survive and grow axenically (without prey) or in the presence of Gram-positive bacterial prey. These advances in the understanding of predatory bacteria have stimulated a renewed interest in these organisms and the potential applications of Bdellovibrio spp. to the benefit of society. Early studies primarily focused on the application of predatory bacteria as "live antibiotics" in the medical field, probiotics in aquaculture and veterinary medicine and their use in agriculture. Additionally, studies have investigated their prevalence in wastewater and environmental sources. However, comprehending that Bdellovibrio spp. may also prey on and target Gram-positive organisms, implies that these predators could specifically be applied for the bioremediation or removal of mixed bacterial communities. Recent studies have also indicated that Bdellovibrio spp. may be useful in controlling food spoilage organisms and subsequently decrease our reliance on food additives. This review will thus highlight recent developments in understanding Bdellovibrio spp. predation strategies and focus on potential new applications of these organisms for water treatment, food preservation, enhancement of industrial processes, and in combination therapies with bacteriophages and/or antibiotics to combat multi-drug resistant organisms.
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Affiliation(s)
- Monique Waso
- Faculty of Health Sciences, University of Johannesburg, PO Box 17011, Doornfontein, 2028, South Africa
| | - Brandon Reyneke
- Department of Microbiology, Faculty of Science, Stellenbosch University, Private Bag X1, Stellenbosch, 7602, South Africa
| | - Benjamin Havenga
- Department of Microbiology, Faculty of Science, Stellenbosch University, Private Bag X1, Stellenbosch, 7602, South Africa
| | - Sehaam Khan
- Faculty of Health Sciences, University of Johannesburg, PO Box 17011, Doornfontein, 2028, South Africa
| | - Wesaal Khan
- Department of Microbiology, Faculty of Science, Stellenbosch University, Private Bag X1, Stellenbosch, 7602, South Africa.
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25
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Lovering AL, Sockett RE. Microbe Profile: Bdellovibrio bacteriovorus: a specialized bacterial predator of bacteria. MICROBIOLOGY-SGM 2021; 167. [PMID: 33843574 PMCID: PMC8289219 DOI: 10.1099/mic.0.001043] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Bdellovibrio bacteriovorus is an environmentally-ubiquitous bacterium that uses unique adaptations to kill other bacteria. The best-characterized strain, HD100, has a multistage lifestyle, with both a free-living attack phase and an intraperiplasmic growth and division phase inside the prey cell. Advances in understanding the basic biology and regulation of predation processes are paving the way for future potential therapeutic and bioremediation applications of this unusual bacterium.
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Atterbury RJ, Tyson J. Predatory bacteria as living antibiotics - where are we now? MICROBIOLOGY-SGM 2021; 167. [PMID: 33465024 DOI: 10.1099/mic.0.001025] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Antimicrobial resistance (AMR) is a global health and economic crisis. With too few antibiotics in development to meet current and anticipated needs, there is a critical need for new therapies to treat Gram-negative infections. One potential approach is the use of living predatory bacteria, such as Bdellovibrio bacteriovorus (small Gram-negative bacteria that naturally invade and kill Gram-negative pathogens of humans, animals and plants). Moving toward the use of Bdellovibrio as a 'living antibiotic' demands the investigation and characterization of these bacterial predators in biologically relevant systems. We review the fundamental science supporting the feasibility of predatory bacteria as alternatives to antibiotics.
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Affiliation(s)
- Robert J Atterbury
- School of Veterinary Medicine and Science, University of Nottingham, Sutton Bonington Campus, Leicestershire, LE12 5RD, UK
| | - Jess Tyson
- School of Life Sciences, University of Nottingham, Medical School, Queen's Medical Centre, Nottingham, NG7 2UH, UK
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