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Kushkevych I, Procházka V, Vítězová M, Dordević D, Abd El-Salam M, Rittmann SKMR. Anoxygenic photosynthesis with emphasis on green sulfur bacteria and a perspective for hydrogen sulfide detoxification of anoxic environments. Front Microbiol 2024; 15:1417714. [PMID: 39056005 PMCID: PMC11269200 DOI: 10.3389/fmicb.2024.1417714] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2024] [Accepted: 06/12/2024] [Indexed: 07/28/2024] Open
Abstract
The bacterial light-dependent energy metabolism can be divided into two types: oxygenic and anoxygenic photosynthesis. Bacterial oxygenic photosynthesis is similar to plants and is characteristic for cyanobacteria. Bacterial anoxygenic photosynthesis is performed by anoxygenic phototrophs, especially green sulfur bacteria (GSB; family Chlorobiaceae) and purple sulfur bacteria (PSB; family Chromatiaceae). In anoxygenic photosynthesis, hydrogen sulfide (H2S) is used as the main electron donor, which differs from plants or cyanobacteria where water is the main source of electrons. This review mainly focuses on the microbiology of GSB, which may be found in water or soil ecosystems where H2S is abundant. GSB oxidize H2S to elemental sulfur. GSB possess special structures-chlorosomes-wherein photosynthetic pigments are located. Chlorosomes are vesicles that are surrounded by a lipid monolayer that serve as light-collecting antennas. The carbon source of GSB is carbon dioxide, which is assimilated through the reverse tricarboxylic acid cycle. Our review provides a thorough introduction to the comparative eco-physiology of GSB and discusses selected application possibilities of anoxygenic phototrophs in the fields of environmental management, bioremediation, and biotechnology.
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Affiliation(s)
- Ivan Kushkevych
- Department of Experimental Biology, Faculty of Science, Masaryk University, Brno, Czechia
| | - Vít Procházka
- Department of Experimental Biology, Faculty of Science, Masaryk University, Brno, Czechia
| | - Monika Vítězová
- Department of Experimental Biology, Faculty of Science, Masaryk University, Brno, Czechia
| | - Dani Dordević
- Department of Plant Origin Foodstuffs Hygiene and Technology, Faculty of Veterinary Hygiene and Ecology, University of Veterinary Sciences, Brno, Czechia
| | - Mohamed Abd El-Salam
- Department of Pharmacognosy, Faculty of Pharmacy, Delta University for Science and Technology, Gamasa, Egypt
- School of Pharmacy and Biomolecular Sciences, Royal College of Surgeons in Ireland, Dublin, Ireland
| | - Simon K.-M. R. Rittmann
- Archaea Physiology & Biotechnology Group, Department of Functional and Evolutionary Ecology, Universität Wien, Wien, Austria
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Bedard DL, Van Slyke G, Nübel U, Bateson MM, Brumfield S, An YJ, Becraft ED, Wood JM, Thiel V, Ward DM. Geographic and Ecological Diversity of Green Sulfur Bacteria in Hot Spring Mat Communities. Microorganisms 2023; 11:2921. [PMID: 38138064 PMCID: PMC10746008 DOI: 10.3390/microorganisms11122921] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2023] [Revised: 11/21/2023] [Accepted: 11/24/2023] [Indexed: 12/24/2023] Open
Abstract
Three strains of thermophilic green sulfur bacteria (GSB) are known; all are from microbial mats in hot springs in Rotorua, New Zealand (NZ) and belong to the species Chlorobaculum tepidum. Here, we describe diverse populations of GSB inhabiting Travel Lodge Spring (TLS) (NZ) and hot springs ranging from 36.1 °C to 51.1 °C in the Republic of the Philippines (PHL) and Yellowstone National Park (YNP), Wyoming, USA. Using targeted amplification and restriction fragment length polymorphism analysis, GSB 16S rRNA sequences were detected in mats in TLS, one PHL site, and three regions of YNP. GSB enrichments from YNP and PHL mats contained small, green, nonmotile rods possessing chlorosomes, chlorobactene, and bacteriochlorophyll c. Partial 16S rRNA gene sequences from YNP, NZ, and PHL mats and enrichments from YNP and PHL samples formed distinct phylogenetic clades, suggesting geographic isolation, and were associated with samples differing in temperature and pH, suggesting adaptations to these parameters. Sequences from enrichments and corresponding mats formed clades that were sometimes distinct, increasing the diversity detected. Sequence differences, monophyly, distribution patterns, and evolutionary simulation modeling support our discovery of at least four new putative moderately thermophilic Chlorobaculum species that grew rapidly at 40 °C to 44 °C.
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Affiliation(s)
- Donna L. Bedard
- Department of Biological Sciences, Rensselaer Polytechnic Institute, Troy, NY 12180, USA; (D.L.B.); (G.V.S.)
| | - Greta Van Slyke
- Department of Biological Sciences, Rensselaer Polytechnic Institute, Troy, NY 12180, USA; (D.L.B.); (G.V.S.)
| | - Ulrich Nübel
- Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, MT 59717, USA; (U.N.); (M.M.B.); (E.D.B.); (J.M.W.)
- Leibniz-Institute DSMZ German Collection of Microorganisms and Cell Cultures, 38124 Braunschweig, Germany;
| | - Mary M. Bateson
- Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, MT 59717, USA; (U.N.); (M.M.B.); (E.D.B.); (J.M.W.)
| | - Sue Brumfield
- Department of Plant Sciences and Plant Pathology, Montana State University, Bozeman, MT 59717, USA;
| | - Yong Jun An
- Department of Biological Sciences, Rensselaer Polytechnic Institute, Troy, NY 12180, USA; (D.L.B.); (G.V.S.)
| | - Eric D. Becraft
- Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, MT 59717, USA; (U.N.); (M.M.B.); (E.D.B.); (J.M.W.)
- Department of Biology, University of North Alabama, Florence, AL 35632, USA
| | - Jason M. Wood
- Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, MT 59717, USA; (U.N.); (M.M.B.); (E.D.B.); (J.M.W.)
- Research Informatics Core, University of Illinois at Chicago, Chicago, IL 60607, USA
| | - Vera Thiel
- Leibniz-Institute DSMZ German Collection of Microorganisms and Cell Cultures, 38124 Braunschweig, Germany;
| | - David M. Ward
- Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, MT 59717, USA; (U.N.); (M.M.B.); (E.D.B.); (J.M.W.)
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Gupta RS, Kanter-Eivin DA. AppIndels.com server: a web-based tool for the identification of known taxon-specific conserved signature indels in genome sequences. Validation of its usefulness by predicting the taxonomic affiliation of >700 unclassified strains of Bacillus species. Int J Syst Evol Microbiol 2023; 73. [PMID: 37159410 DOI: 10.1099/ijsem.0.005844] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/11/2023] Open
Abstract
Taxon-specific conserved signature indels (CSIs) in genes/proteins provide reliable molecular markers (synapomorphies) for unambiguous demarcation of taxa of different ranks in molecular terms and for genetic, biochemical and diagnostic studies. Because of their predictive abilities, the shared presence of known taxon-specific CSIs in genome sequences has proven useful for taxonomic purposes. However, the lack of a convenient method for identifying the presence of known CSIs in genome sequences has limited their utility for taxonomic and other studies. We describe here a web-based tool/server (AppIndels.com) that identifies the presence of known and validated CSIs in genome sequences and uses this information for predicting taxonomic affiliation. The utility of this server was tested by using a database of 585 validated CSIs, which included 350 CSIs specific for ≈45 Bacillales genera, with the remaining CSIs being specific for members of the orders Neisseriales, Legionellales and Chlorobiales, family Borreliaceae, and some Pseudomonadaceae species/genera. Using this server, genome sequences were analysed for 721 Bacillus strains of unknown taxonomic affiliation. Results obtained showed that 651 of these genomes contained significant numbers of CSIs specific for the following Bacillales genera/families: Alkalicoccus, 'Alkalihalobacillaceae', Alteribacter, Bacillus Cereus clade, Bacillus Subtilis clade, Caldalkalibacillus, Caldibacillus, Cytobacillus, Ferdinandcohnia, Gottfriedia, Heyndrickxia, Lederbergia, Litchfieldia, Margalitia, Mesobacillus, Metabacillus, Neobacillus, Niallia, Peribacillus, Priestia, Pseudalkalibacillus, Robertmurraya, Rossellomorea, Schinkia, Siminovitchia, Sporosarcina, Sutcliffiella, Weizmannia and Caryophanaceae. Validity of the taxon assignment made by the server was examined by reconstructing phylogenomic trees. In these trees, all Bacillus strains for which taxonomic predictions were made correctly branched with the indicated taxa. The unassigned strains likely correspond to taxa for which CSIs are lacking in our database. Results presented here show that the AppIndels server provides a useful new tool for predicting taxonomic affiliation based on shared presence of the taxon-specific CSIs. Some caveats in using this server are discussed.
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Affiliation(s)
- Radhey S Gupta
- Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario CA L8N 3Z5, Canada
| | - David A Kanter-Eivin
- Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario CA L8N 3Z5, Canada
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Chimeric inheritance and crown-group acquisitions of carbon fixation genes within Chlorobiales: Origins of autotrophy in Chlorobiales and implication for geological biomarkers. PLoS One 2022; 17:e0275539. [PMID: 36227849 PMCID: PMC9560492 DOI: 10.1371/journal.pone.0275539] [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: 03/21/2022] [Accepted: 09/16/2022] [Indexed: 11/21/2022] Open
Abstract
The geological record of microbial metabolisms and ecologies primarily consists of stable isotope fractionations and the diagenetic products of biogenic lipids. Carotenoid lipid biomarkers are particularly useful proxies for reconstructing this record, providing information on microbial phototroph primary productivity, redox couples, and oxygenation. The biomarkers okenane, chlorobactane, and isorenieratene are generally considered to be evidence of anoxygenic phototrophs, and provide a record that extends to 1.64 Ga. The utility of the carotenoid biomarker record may be enhanced by examining the carbon isotopic ratios in these products, which are diagnostic for specific pathways of biological carbon fixation found today within different microbial groups. However, this joint inference assumes that microbes have conserved these pathways across the duration of the preserved biomarker record. Testing this hypothesis, we performed phylogenetic analyses of the enzymes constituting the reductive tricarboxylic acid (rTCA) cycle in Chlorobiales, the group of anoxygenic phototrophic bacteria usually implicated in the deposition of chlorobactane and isorenieretane. We find phylogenetically incongruent patterns of inheritance across all enzymes, indicative of horizontal gene transfers to both stem and crown Chlorobiales from multiple potential donor lineages. This indicates that a complete rTCA cycle was independently acquired at least twice within Chlorobiales and was not present in the last common ancestor. When combined with recent molecular clock analyses, these results predict that the Mesoproterzoic lipid biomarker record diagnostic for Chlorobiales should not preserve isotopic fractionations indicative of a full rTCA cycle. Furthermore, we conclude that coupling isotopic and biomarker records is insufficient for reliably reconstructing microbial paleoecologies in the absence of a complementary and consistent phylogenomic narrative.
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Grouzdev D, Gaisin V, Lunina O, Krutkina M, Krasnova E, Voronov D, Baslerov R, Sigalevich P, Savvichev A, Gorlenko V. Microbial communities of stratified aquatic ecosystems of Kandalaksha Bay (White Sea) shed light on the evolutionary history of green and brown morphotypes of Chlorobiota. FEMS Microbiol Ecol 2022; 98:6693937. [PMID: 36073352 DOI: 10.1093/femsec/fiac103] [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: 05/12/2022] [Revised: 08/30/2022] [Accepted: 09/01/2022] [Indexed: 12/14/2022] Open
Abstract
Anoxygenic photoautotrophic metabolism of green sulfur bacteria of the family Chlorobiaceae played a significant role in establishing the Earth's biosphere. Two known major ecological forms of these phototrophs differ in their pigment composition and, therefore, in color: the green and brown forms. The latter form often occurs in low-light environments and is specialized to harvest blue light, which can penetrate to the greatest depth in the water column. In the present work, metagenomic sequencing was used to investigate the natural population of brown Chl. phaeovibrioides ZM in a marine stratified Zeleny Mys lagoon in the Kandalaksha Bay (the White Sea) to supplement the previously obtained genomes of brown Chlorobiaceae. The genomes of brown and green Chlorobiaceae were investigated using comparative genome analysis and phylogenetic and reconciliation analysis to reconstruct the evolution of these ecological forms. Our results support the suggestion that the last common ancestor of Chlorobiaceae belonged to the brown form, i.e. it was adapted to the conditions of low illumination. However, despite the vertical inheritance of these characteristics, among modern Chlorobiaceae populations, the genes responsible for synthesizing the pigments of the brown form are subject to active horizontal transfer.
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Affiliation(s)
- Denis Grouzdev
- SciBear OU, 10115 Tallinn, Estonia.,School of Marine and Atmospheric Sciences, Stony Brook University, 11794, Stony Brook, USA
| | - Vasil Gaisin
- Research Center of Biotechnology of the Russian Academy of Sciences, 119071, Moscow, Russia.,Current affiliation: Institute of Molecular Biology & Biophysics, Eidgenössische Technische Hochschule Zürich, Zurich, Switzerland
| | - Olga Lunina
- Research Center of Biotechnology of the Russian Academy of Sciences, 119071, Moscow, Russia
| | | | - Elena Krasnova
- Pertsov White Sea Biological Station, 184042, Republic Karelia, Russia
| | - Dmitry Voronov
- Kharkevich Institute for Information Transmission Problems, Russian Academy of Sciences, 127051, Moscow, Russia
| | - Roman Baslerov
- Research Center of Biotechnology of the Russian Academy of Sciences, 119071, Moscow, Russia
| | - Pavel Sigalevich
- Research Center of Biotechnology of the Russian Academy of Sciences, 119071, Moscow, Russia
| | - Alexander Savvichev
- Research Center of Biotechnology of the Russian Academy of Sciences, 119071, Moscow, Russia
| | - Vladimir Gorlenko
- Research Center of Biotechnology of the Russian Academy of Sciences, 119071, Moscow, Russia
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