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Duchin Rapp Y, Lipsman V, Yuda L, Kublanov IV, Matsliyah D, Segev E. Algal exudates promote conjugation in marine Roseobacters. mBio 2024:e0106224. [PMID: 39189747 DOI: 10.1128/mbio.01062-24] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2024] [Accepted: 07/22/2024] [Indexed: 08/28/2024] Open
Abstract
Horizontal gene transfer (HGT) is a pivotal mechanism driving bacterial evolution, conferring adaptability within dynamic marine ecosystems. Among HGT mechanisms, conjugation mediated by type IV secretion systems (T4SSs) plays a central role in the ecological success of marine bacteria. However, the conditions promoting conjugation events in the marine environment are not well-understood. Roseobacters, abundant marine bacteria commonly associated with algae, possess a multitude of T4SSs. Many Roseobacters are heterotrophic bacteria that rely on algal secreted compounds to support their growth. These compounds attract bacteria, facilitating colonization and attachment to algal cells. Algae and their metabolites bring bacteria into close proximity, potentially promoting bacterial HGT. Investigation across various Roseobacters revealed that algal exudates indeed enhance plasmid transfer through conjugation. While algal exudates do not influence the transcription of bacterial conjugative machinery genes, they promote bacterial attachment, potentially stabilizing proximity and facilitating HGT. Notably, under conditions where attachment is less advantageous, the impact of algal exudates on conjugation is reduced. These findings suggest that algae enhance bacterial conjugation primarily by fostering attachment and highlight the importance of studying bacterial HGT within the context of algal-bacterial interactions. IMPORTANCE This study explores how algal-bacterial interactions influence horizontal gene transfer (HGT) among marine bacteria. HGT, a key driver of bacterial evolution, is facilitated by conjugation mediated by type IV secretion systems (T4SSs). Through investigating Roseobacters, abundant marine bacteria often found to be associated with algae, the study reveals that algal exudates enhance plasmid transfer via conjugation. This enhancement is attributed to the promotion of bacterial attachment by algal compounds, emphasizing the role of algal-bacterial interactions in shaping genetic exchange within dynamic marine ecosystems. Understanding these mechanisms is crucial for elucidating bacterial adaptability and evolution in the marine environment.
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Affiliation(s)
- Yemima Duchin Rapp
- Department of Plant and Environmental Sciences, Weizmann Institute of Science, Rehovot, Israel
| | - Valeria Lipsman
- Department of Plant and Environmental Sciences, Weizmann Institute of Science, Rehovot, Israel
| | - Lilach Yuda
- Department of Plant and Environmental Sciences, Weizmann Institute of Science, Rehovot, Israel
| | - Ilya V Kublanov
- Department of Plant and Environmental Sciences, Weizmann Institute of Science, Rehovot, Israel
| | - Dor Matsliyah
- Department of Plant and Environmental Sciences, Weizmann Institute of Science, Rehovot, Israel
| | - Einat Segev
- Department of Plant and Environmental Sciences, Weizmann Institute of Science, Rehovot, Israel
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2
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Christi K, Hudson J, Egan S. Current approaches to genetic modification of marine bacteria and considerations for improved transformation efficiency. Microbiol Res 2024; 284:127729. [PMID: 38663232 DOI: 10.1016/j.micres.2024.127729] [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: 10/18/2023] [Revised: 02/25/2024] [Accepted: 04/15/2024] [Indexed: 05/26/2024]
Abstract
Marine bacteria play vital roles in symbiosis, biogeochemical cycles and produce novel bioactive compounds and enzymes of interest for the pharmaceutical, biofuel and biotechnology industries. At present, investigations into marine bacterial functions and their products are primarily based on phenotypic observations, -omic type approaches and heterologous gene expression. To advance our understanding of marine bacteria and harness their full potential for industry application, it is critical that we have the appropriate tools and resources to genetically manipulate them in situ. However, current genetic tools that are largely designed for model organisms such as E. coli, produce low transformation efficiencies or have no transfer ability in marine bacteria. To improve genetic manipulation applications for marine bacteria, we need to improve transformation methods such as conjugation and electroporation in addition to identifying more marine broad host range plasmids. In this review, we aim to outline the reported methods of transformation for marine bacteria and discuss the considerations for each approach in the context of improving efficiency. In addition, we further discuss marine plasmids and future research areas including CRISPR tools and their potential applications for marine bacteria.
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Affiliation(s)
- Katrina Christi
- Centre for Marine Science and Innovation, School of Biological, Earth and Environmental Sciences, Faculty of Science, The University of New South Wales, Kensington, NSW, Australia
| | - Jennifer Hudson
- Centre for Marine Science and Innovation, School of Biological, Earth and Environmental Sciences, Faculty of Science, The University of New South Wales, Kensington, NSW, Australia
| | - Suhelen Egan
- Centre for Marine Science and Innovation, School of Biological, Earth and Environmental Sciences, Faculty of Science, The University of New South Wales, Kensington, NSW, Australia.
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3
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Hahnke S, Berger M, Schlingloff A, Athale I, Wolf J, Neumann-Schaal M, Adenaya A, Poehlein A, Daniel R, Petersen J, Brinkhoff T. Roseobacter fucihabitans sp. nov., isolated from the brown alga Fucus spiralis. Int J Syst Evol Microbiol 2024; 74. [PMID: 38861315 DOI: 10.1099/ijsem.0.006403] [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] [Indexed: 06/12/2024] Open
Abstract
A Gram-negative, aerobic, pink-pigmented, and bacteriochlorophyll a-containing bacterial strain, designated B14T, was isolated from the macroalga Fucus spiralis sampled from the southern North Sea, Germany. Based on 16S rRNA gene sequences, species of the genera Roseobacter and Sulfitobacter were most closely related to strain B14T with sequence identities ranging from 98.15 % (Roseobacter denitrificans Och 114T) to 99.11 % (Roseobacter litoralis Och 149T), whereas Sulfitobacter mediterraneus CH-B427T exhibited 98.52 % sequence identity. Digital DNA-DNA hybridization and average nucleotide identity values between the genome of the novel strain and that of closely related Roseobacter and Sulfitobacter type strains were <20 % and <77 %, respectively. The novel strain contained ubiquinone-10 as the only respiratory quinone and C18 : 1 ω7c, C16 : 0, C18 : 0, C12 : 1 ω7c, C18 : 2 ω7,13c, and C10 : 0 3-OH as the major cellular fatty acids. The predominant polar lipids of strain B14T were phosphatidylcholine, phosphatidylethanolamine, and phosphatidylglycerol. The genome of strain B14T comprises a chromosome with a size of 4.5 Mbp, one chromid, and four plasmids. The genome contains the complete gene cluster for aerobic anoxygenic photosynthesis required for a photoheterotrophic lifestyle. The results of this study indicate that strain B14T (=DSM 116946T=LMG 33352T) represents a novel species of the genus Roseobacter for which the name Roseobacter fucihabitans sp. nov. is proposed.
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Affiliation(s)
- Sarah Hahnke
- Institute for Chemistry and Biology of the Marine Environment (ICBM), University of Oldenburg, Carl-von-Ossietzky-Str. 9-11, 26129 Oldenburg, Germany
- Present address: Department of Human Medicine, University of Oldenburg, Carl-von-Ossietzky Str. 9-11, 26129 Oldenburg, Germany
| | - Martine Berger
- Institute for Chemistry and Biology of the Marine Environment (ICBM), University of Oldenburg, Carl-von-Ossietzky-Str. 9-11, 26129 Oldenburg, Germany
| | - Andrea Schlingloff
- Institute for Chemistry and Biology of the Marine Environment (ICBM), University of Oldenburg, Carl-von-Ossietzky-Str. 9-11, 26129 Oldenburg, Germany
| | - Isha Athale
- Institute for Chemistry and Biology of the Marine Environment (ICBM), University of Oldenburg, Carl-von-Ossietzky-Str. 9-11, 26129 Oldenburg, Germany
| | - Jacqueline Wolf
- Leibniz-Institut DSMZ - Deutsche Sammlung von Mikroorganismen und Zellkulturen, Inhoffenstr. 7B, 38124 Braunschweig, Germany
| | - Meina Neumann-Schaal
- Leibniz-Institut DSMZ - Deutsche Sammlung von Mikroorganismen und Zellkulturen, Inhoffenstr. 7B, 38124 Braunschweig, Germany
| | - Adenike Adenaya
- Institute for Chemistry and Biology of the Marine Environment (ICBM), University of Oldenburg, Carl-von-Ossietzky-Str. 9-11, 26129 Oldenburg, Germany
| | - Anja Poehlein
- Department of Genomic and Applied Microbiology & Göttingen Genomics Laboratory, Institute of Microbiology and Genetics, Georg August University Göttingen, Grisebachstr. 8, 37077 Göttingen, Germany
| | - Rolf Daniel
- Department of Genomic and Applied Microbiology & Göttingen Genomics Laboratory, Institute of Microbiology and Genetics, Georg August University Göttingen, Grisebachstr. 8, 37077 Göttingen, Germany
| | - Jörn Petersen
- Leibniz-Institut DSMZ - Deutsche Sammlung von Mikroorganismen und Zellkulturen, Inhoffenstr. 7B, 38124 Braunschweig, Germany
| | - Thorsten Brinkhoff
- Institute for Chemistry and Biology of the Marine Environment (ICBM), University of Oldenburg, Carl-von-Ossietzky-Str. 9-11, 26129 Oldenburg, Germany
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4
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Körner D, Schäfer NM, Lagares Jr. A, Birmes L, Oehlmann NN, Addison H, Pöhl S, Thanbichler M, Rebelein JG, Petersen J, Becker A. Modular Low-Copy-Number Plasmid Vectors for Rhodobacterales with Extended Host Range in Alphaproteobacteria. ACS Synth Biol 2024; 13:1537-1548. [PMID: 38718218 PMCID: PMC11107812 DOI: 10.1021/acssynbio.4c00062] [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: 01/30/2024] [Revised: 03/27/2024] [Accepted: 04/15/2024] [Indexed: 05/18/2024]
Abstract
Members of the alphaproteobacterial order Rhodobacterales are metabolically diverse and highly abundant in the ocean. They are becoming increasingly interesting for marine biotechnology, due to their ecological adaptability, wealth of versatile low-copy-number plasmids, and their ability to produce secondary metabolites. However, molecular tools for engineering strains of this bacterial lineage are limited. Here, we expand the genetic toolbox by establishing standardized, modular repABC-based plasmid vectors of four well-characterized compatibility groups from the Roseobacter group applicable in the Rhodobacterales, and likely in further alphaproteobacterial orders (Hyphomicrobiales, Rhodospirillales, Caulobacterales). We confirmed replication of these newly constructed pABC vectors in two members of Rhodobacterales, namely, Dinoroseobacter shibae DFL 12 and Rhodobacter capsulatus B10S, as well as in two members of the alphaproteobacterial order Hyphomicrobiales (synonym: Rhizobiales; Ensifer meliloti 2011 and "Agrobacterium fabrum" C58). Maintenance of the pABC vectors in the biotechnologically valuable orders Rhodobacterales and Hyphomicrobiales facilitates the shuttling of genetic constructs between alphaproteobacterial genera and orders. Additionally, plasmid replication was verified in one member of Rhodospirillales (Rhodospirillum rubrum S1) as well as in one member of Caulobacterales (Caulobacter vibrioides CB15N). The modular construction of pABC vectors and the usage of four compatible replication systems, which allows their coexistence in a host cell, are advantageous features for future implementations of newly designed synthetic pathways. The vector applicability was demonstrated by functional complementation of a nitrogenase mutant phenotype by two complementary pABC-based plasmids in R. capsulatus.
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Affiliation(s)
- Désirée Körner
- Center
for Synthetic Microbiology (SYNMIKRO) and Department of Biology, Philipps-Universität Marburg, Marburg 35043, Germany
| | - Niklas M. Schäfer
- Center
for Synthetic Microbiology (SYNMIKRO) and Department of Biology, Philipps-Universität Marburg, Marburg 35043, Germany
| | - Antonio Lagares Jr.
- Center
for Synthetic Microbiology (SYNMIKRO) and Department of Biology, Philipps-Universität Marburg, Marburg 35043, Germany
| | - Lukas Birmes
- Leibniz-Institut
DSMZ - Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH, Braunschweig 38124, Germany
| | - Niels N. Oehlmann
- Max
Planck Institute for Terrestrial Microbiology, Marburg 35043, Germany
| | - Holly Addison
- Max
Planck Institute for Terrestrial Microbiology, Marburg 35043, Germany
| | - Sebastian Pöhl
- Center
for Synthetic Microbiology (SYNMIKRO) and Department of Biology, Philipps-Universität Marburg, Marburg 35043, Germany
| | - Martin Thanbichler
- Center
for Synthetic Microbiology (SYNMIKRO) and Department of Biology, Philipps-Universität Marburg, Marburg 35043, Germany
- Max
Planck Institute for Terrestrial Microbiology, Marburg 35043, Germany
| | - Johannes G. Rebelein
- Center
for Synthetic Microbiology (SYNMIKRO) and Department of Biology, Philipps-Universität Marburg, Marburg 35043, Germany
- Max
Planck Institute for Terrestrial Microbiology, Marburg 35043, Germany
| | - Jörn Petersen
- Leibniz-Institut
DSMZ - Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH, Braunschweig 38124, Germany
| | - Anke Becker
- Center
for Synthetic Microbiology (SYNMIKRO) and Department of Biology, Philipps-Universität Marburg, Marburg 35043, Germany
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5
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Abe M, Kanaly RA, Mori JF. Genomic analysis of a marine alphaproteobacterium Sagittula sp. strain MA-2 that carried eight plasmids. Mar Genomics 2023; 72:101070. [PMID: 38008530 DOI: 10.1016/j.margen.2023.101070] [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: 08/18/2023] [Revised: 09/21/2023] [Accepted: 09/21/2023] [Indexed: 11/28/2023]
Abstract
Bacteria that belong to the family Roseobacteraceae in the Alphaproteobacteria class are widely distributed in marine environments with remarkable physiological diversity, which is considered to be attributed to their genomic plasticity. In this study, a novel isolate of the genus Sagittula within Roseobacteraceae, strain MA-2, was obtained from a coastal marine bacterial consortium enriched with aromatic hydrocarbons, and its complete genome was sequenced. The genome with a total size of 5.69 Mbp was revealed to consist of a 4.67-Mbp circular chromosome and eight circular plasmids ranging in size from 19.5 to 361.5 kbp. Further analyses of functional genes in the strain MA-2 genome identified homologous genes responsible for the biotransformation of gentisic acid, which were located on one of its plasmids and were not found in genomes of other Sagittula strains available from databases. This suggested that strain MA-2 had acquired these genes via horizontal gene transfers that enabled them to degrade and utilize gentisic acid as a growth substrate. This study provided the second complete genome sequence of the genus Sagittula and supports the hypothesis that acquisition of ecologically relevant genes in extrachromosomal replicons allows Roseobacteraceae to be highly adaptable to diverse lifestyles.
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Affiliation(s)
- Mayuko Abe
- Graduate School of Nanobiosciences, Yokohama City University, Japan
| | - Robert A Kanaly
- Graduate School of Nanobiosciences, Yokohama City University, Japan
| | - Jiro F Mori
- Graduate School of Nanobiosciences, Yokohama City University, Japan.
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6
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Shao M, Liu L, Liu B, Zheng H, Meng W, Liu Y, Zhang X, Ma X, Sun C, Luo X, Li F, Xing B. Hormetic Effect of Pyroligneous Acids on Conjugative Transfer of Plasmid-mediated Multi-antibiotic Resistance Genes within Bacterial Genus. ACS ENVIRONMENTAL AU 2023; 3:105-120. [PMID: 37102089 PMCID: PMC10125354 DOI: 10.1021/acsenvironau.2c00056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/17/2022] [Revised: 12/12/2022] [Accepted: 12/13/2022] [Indexed: 04/28/2023]
Abstract
Spread of antibiotic resistance genes (ARGs) by conjugation poses great challenges to public health. Application of pyroligneous acids (PA) as soil amendments has been evidenced as a practical strategy to remediate pollution of ARGs in soils. However, little is known about PA effects on horizontal gene transfer (HGT) of ARGs by conjugation. This study investigated the effects of a woody waste-derived PA prepared at 450°C and its three distillation components (F1, F2, and F3) at different temperatures (98, 130, and 220°C) on conjugative transfer of plasmid RP4 within Escherichia coli. PA at relatively high amount (40-100 μL) in a 30-mL mating system inhibited conjugation by 74-85%, following an order of PA > F3 ≈ F2 ≈ F1, proving the hypothesis that PA amendments may mitigate soil ARG pollution by inhibiting HGT. The bacteriostasis caused by antibacterial components of PA, including acids, phenols, and alcohols, as well as its acidity (pH 2.81) contributed to the inhibited conjugation. However, a relatively low amount (10-20 μL) of PA in the same mating system enhanced ARG transfer by 26-47%, following an order of PA > F3 ≈ F2 > F1. The opposite effect at low amount is mainly attributed to the increased intracellular reactive oxygen species production, enhanced cell membrane permeability, increased extracellular polymeric substance contents, and reduced cell surface charge. Our findings highlight the hormesis (low-amount promotion and high-amount inhibition) of PA amendments on ARG conjugation and provide evidence for selecting an appropriate amount of PA amendment to control the dissemination of soil ARGs. Moreover, the promoted conjugation also triggers questions regarding the potential risks of soil amendments (e.g., PA) in the spread of ARGs via HGT.
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Affiliation(s)
- Mengying Shao
- Institute
of Coastal Environmental Pollution Control, Ministry of Education
Key Laboratory of Marine Environment and Ecology, College of Environmental
Science and Engineering, Frontiers Science Center for Deep Ocean Multispheres
and Earth System, Ocean University of China, Qingdao 266100, China
- Marine
Ecology and Environmental Science Laboratory, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China
| | - Liuqingqing Liu
- Institute
of Coastal Environmental Pollution Control, Ministry of Education
Key Laboratory of Marine Environment and Ecology, College of Environmental
Science and Engineering, Frontiers Science Center for Deep Ocean Multispheres
and Earth System, Ocean University of China, Qingdao 266100, China
- Marine
Ecology and Environmental Science Laboratory, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China
| | - Bingjie Liu
- Institute
of Coastal Environmental Pollution Control, Ministry of Education
Key Laboratory of Marine Environment and Ecology, College of Environmental
Science and Engineering, Frontiers Science Center for Deep Ocean Multispheres
and Earth System, Ocean University of China, Qingdao 266100, China
- Ministry
of Ecology and Environment, South China
Institute of Environmental Sciences, Guangzhou 510535, China
| | - Hao Zheng
- Institute
of Coastal Environmental Pollution Control, Ministry of Education
Key Laboratory of Marine Environment and Ecology, College of Environmental
Science and Engineering, Frontiers Science Center for Deep Ocean Multispheres
and Earth System, Ocean University of China, Qingdao 266100, China
- Marine
Ecology and Environmental Science Laboratory, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China
- Sanya
Oceanographic Institution, Ocean University
of China, Sanya 572000, China
| | - Wei Meng
- Institute
of Coastal Environmental Pollution Control, Ministry of Education
Key Laboratory of Marine Environment and Ecology, College of Environmental
Science and Engineering, Frontiers Science Center for Deep Ocean Multispheres
and Earth System, Ocean University of China, Qingdao 266100, China
| | - Yifan Liu
- Institute
of Coastal Environmental Pollution Control, Ministry of Education
Key Laboratory of Marine Environment and Ecology, College of Environmental
Science and Engineering, Frontiers Science Center for Deep Ocean Multispheres
and Earth System, Ocean University of China, Qingdao 266100, China
| | - Xiao Zhang
- Institute
of Coastal Environmental Pollution Control, Ministry of Education
Key Laboratory of Marine Environment and Ecology, College of Environmental
Science and Engineering, Frontiers Science Center for Deep Ocean Multispheres
and Earth System, Ocean University of China, Qingdao 266100, China
| | - Xiaohan Ma
- Institute
of Coastal Environmental Pollution Control, Ministry of Education
Key Laboratory of Marine Environment and Ecology, College of Environmental
Science and Engineering, Frontiers Science Center for Deep Ocean Multispheres
and Earth System, Ocean University of China, Qingdao 266100, China
- Marine
Ecology and Environmental Science Laboratory, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China
| | - Cuizhu Sun
- Institute
of Coastal Environmental Pollution Control, Ministry of Education
Key Laboratory of Marine Environment and Ecology, College of Environmental
Science and Engineering, Frontiers Science Center for Deep Ocean Multispheres
and Earth System, Ocean University of China, Qingdao 266100, China
- Marine
Ecology and Environmental Science Laboratory, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China
| | - Xianxiang Luo
- Institute
of Coastal Environmental Pollution Control, Ministry of Education
Key Laboratory of Marine Environment and Ecology, College of Environmental
Science and Engineering, Frontiers Science Center for Deep Ocean Multispheres
and Earth System, Ocean University of China, Qingdao 266100, China
- Marine
Ecology and Environmental Science Laboratory, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China
- Sanya
Oceanographic Institution, Ocean University
of China, Sanya 572000, China
| | - Fengmin Li
- Institute
of Coastal Environmental Pollution Control, Ministry of Education
Key Laboratory of Marine Environment and Ecology, College of Environmental
Science and Engineering, Frontiers Science Center for Deep Ocean Multispheres
and Earth System, Ocean University of China, Qingdao 266100, China
- Marine
Ecology and Environmental Science Laboratory, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China
- Sanya
Oceanographic Institution, Ocean University
of China, Sanya 572000, China
| | - Baoshan Xing
- Stockbridge
School of Agriculture, University of Massachusetts, Amherst, Massachusetts 01003, United States
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7
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Beyond the ABCs—Discovery of Three New Plasmid Types in Rhodobacterales (RepQ, RepY, RepW). Microorganisms 2022; 10:microorganisms10040738. [PMID: 35456790 PMCID: PMC9025767 DOI: 10.3390/microorganisms10040738] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Revised: 03/18/2022] [Accepted: 03/24/2022] [Indexed: 02/01/2023] Open
Abstract
Copiotrophic marine bacteria of the Roseobacter group (Rhodobacterales, Alphaproteobacteria) are characterized by a multipartite genome organization. We sequenced the genomes of Sulfitobacter indolifex DSM 14862T and four related plasmid-rich isolates in order to investigate the composition, distribution, and evolution of their extrachromosomal replicons (ECRs). A combination of long-read PacBio and short-read Illumina sequencing was required to establish complete closed genomes that comprised up to twelve ECRs. The ECRs were differentiated in stably evolving chromids and genuine plasmids. Among the chromids, a diagnostic RepABC-8 replicon was detected in four Sulfitobacter species that likely reflects an evolutionary innovation that originated in their common ancestor. Classification of the ECRs showed that the most abundant plasmid system is RepABC, followed by RepA, DnaA-like, and RepB. However, the strains also contained three novel plasmid types that were designated RepQ, RepY, and RepW. We confirmed the functionality of their replicases, investigated the genetic inventory of the mostly cryptic plasmids, and retraced their evolutionary origin. Remarkably, the RepY plasmid of S. pontiacus DSM 110277 is the first high copy-number plasmid discovered in Rhodobacterales.
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8
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Tomasch J, Ringel V, Wang H, Freese HM, Bartling P, Brinkmann H, Vollmers J, Jarek M, Wagner-Döbler I, Petersen J. Fatal affairs - conjugational transfer of a dinoflagellate-killing plasmid between marine Rhodobacterales. Microb Genom 2022; 8:000787. [PMID: 35254236 PMCID: PMC9176285 DOI: 10.1099/mgen.0.000787] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
The roseobacter group of marine bacteria is characterized by a mosaic distribution of ecologically important phenotypes. These are often encoded on mobile extrachromosomal replicons. So far, conjugation had only been experimentally proven between the two model organisms Phaeobacter inhibens and Dinoroseobacter shibae. Here, we show that two large natural RepABC-type plasmids from D. shibae can be transferred into representatives of all known major Rhodobacterales lineages. Complete genome sequencing of the newly established Phaeobacter inhibens transconjugants confirmed their genomic integrity. The conjugated plasmids were stably maintained as single copy number replicons in the genuine as well as the new host. Co-cultivation of Phaeobacter inhibens and the transconjugants with the dinoflagellate Prorocentrum minimum demonstrated that Phaeobacter inhibens is a probiotic strain that improves the yield and stability of the dinoflagellate culture. The transconjugant carrying the 191 kb plasmid, but not the 126 kb sister plasmid, killed the dinoflagellate in co-culture.
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Affiliation(s)
- Jürgen Tomasch
- Laboratory of Anoxygenic Phototrophs, Institute of Microbiology of the Czech Academy of Science – Centre Algatech, Třeboň, Czech Republic
- *Correspondence: Jürgen Tomasch,
| | - Victoria Ringel
- Department of Microbial Ecology and Diversity Research, Leibniz Institute DSMZ – German Collection of Microorganisms and Cell Cultures, Braunschweig, Germany
| | - Hui Wang
- Institute of Microbiology, Technical University of Braunschweig, Braunschweig, Germany
| | - Heike M. Freese
- Department of Microbial Ecology and Diversity Research, Leibniz Institute DSMZ – German Collection of Microorganisms and Cell Cultures, Braunschweig, Germany
| | - Pascal Bartling
- Department of Microbial Ecology and Diversity Research, Leibniz Institute DSMZ – German Collection of Microorganisms and Cell Cultures, Braunschweig, Germany
- Present address: Schülke & Mayr GmbH, Norderstedt, Germany
| | - Henner Brinkmann
- Department of Microbial Ecology and Diversity Research, Leibniz Institute DSMZ – German Collection of Microorganisms and Cell Cultures, Braunschweig, Germany
| | - John Vollmers
- Institute for Biological Interfaces 5: Biotechnology and Microbial Genetics, Karlsruhe Institute of Technology, Karlsruhe, Germany
| | - Michael Jarek
- Group Genome Analytics, Helmholtz Centre for Infection Research, Braunschweig, Germany
| | - Irene Wagner-Döbler
- Institute of Microbiology, Technical University of Braunschweig, Braunschweig, Germany
| | - Jörn Petersen
- Department of Microbial Ecology and Diversity Research, Leibniz Institute DSMZ – German Collection of Microorganisms and Cell Cultures, Braunschweig, Germany
- *Correspondence: Jörn Petersen,
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