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Rafieyan S, Amoozegar MA, Makzum S, Salimi-Ashtiani M, Nikou MM, Ventosa A, Sanchez-Porro C. Marinobacter iranensis sp. nov., a slightly halophilic bacterium from a hypersaline lake. Int J Syst Evol Microbiol 2023; 73. [PMID: 37889849 DOI: 10.1099/ijsem.0.006083] [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: 10/29/2023] Open
Abstract
A novel halophilic bacterium, strain 71-iT, was isolated from Inche-Broun hypersaline lake in Golestan province, in the north of Iran. It was a Gram-stain-negative, non-endospore forming, rod-shaped bacterium. It grew at 4-40 °C (optimum 30 °C), pH 6.0-11.0 (optimum pH 7.5) and with 0.5-15 % (w/v) NaCl [optimum 3 % (w/v) NaCl]. The results of phylogenetic analyses based on the 16S rRNA gene sequence comparison indicated its affiliation to the genus Marinobacter and the low percentage of identity with the most closely related species (97.5 %), indicated its placement as a novel species within this genus. Digital DNA-DNA hybridization (dDDH) values and average nucleotide identity (ANI) analyses of this strain against closely related species confirmed its condition of novel taxon. On the other hand, the percentage of the average amino acid identity (AAI) affiliated strain 71-iT within the genus Marinobacter. The DNA G+C content of this isolate was 57.7 mol%. The major fatty acids were C16 : 0 and C16 : 1ω7c and/or C16 : 1 ω6c. Ubiquinone-9 was the major isoprenoid quinone and diphosphatidylglycerol (DPG), phosphatidylglycerol (PG) and phosphatidylethanolamine (PE) were the main polar lipids of this strain. On the basis of the phylogenomic and phenotypic (including chemotaxonomic) features, we propose strain 71-iT (= IBRC M 11023T = CECT 30160T = LMG 29252T) as the type strain of a novel species within the genus Marinobacter, with the name Marinobacter iranensis sp. nov. Genomic detections of this strain in various metagenomic databases indicate that it is a relatively abundant species in environments with low salinities (approximately 5 % salinity), but not in hypersaline habitats with high salt concentrations.
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Affiliation(s)
- Shokufeh Rafieyan
- Microorganisms Bank, Iranian Biological Resource Centre (IBRC), ACECR Tehran-Iran, Tehran, Iran
| | - Mohammad Ali Amoozegar
- Extremophiles Laboratory, Department of Microbiology, Faculty of Biology and Center of Excellence in Phylogeny of Living Organisms, College of Science, University of Tehran, Tehran, Iran
| | - Somaye Makzum
- Microorganisms Bank, Iranian Biological Resource Centre (IBRC), ACECR Tehran-Iran, Tehran, Iran
| | - Mahsa Salimi-Ashtiani
- Microorganisms Bank, Iranian Biological Resource Centre (IBRC), ACECR Tehran-Iran, Tehran, Iran
| | - Mahdi Moshtaghi Nikou
- Microorganisms Bank, Iranian Biological Resource Centre (IBRC), ACECR Tehran-Iran, Tehran, Iran
| | - Antonio Ventosa
- Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, 41012 Sevilla, Spain
| | - Cristina Sanchez-Porro
- Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, 41012 Sevilla, Spain
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Kashevskii AV, Bulaev AG, Stom DI, Kalashnikova OB, Ramonova AA, Alferov SV, Topchiy IA, Zhdanova GO, Kupchinsky AB, Tolstoy MY, Petrova YY. Electrochemical Characteristics of the Oxidation of Sulfur- and Iron-Containing Compounds by Acidophilic Microorganisms. Indian J Microbiol 2022; 62:558-568. [PMID: 36458215 PMCID: PMC9705681 DOI: 10.1007/s12088-022-01034-9] [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: 05/05/2022] [Accepted: 07/26/2022] [Indexed: 11/05/2022] Open
Abstract
The electrochemical features of the interactions of sulfur- and iron-containing compounds (ferrous sulfate, elemental sulfur, pyrite tailings, cysteine, sodium thiosulfate) with a model acidophilic consortium, including the genera Leptospirillum, Sulfobacillus, Acidithiobacillus, Ferroplasma, and Acidiplasma, were studied. The method of cyclic voltammetry recorded redox processes at the electrode/solution interface in the presence of the studied sulfur- and iron-containing compounds. In general, the modeling consortium led to the intensification of these processes. The characteristics of the diffuse layer near the electrode/solution interface were studied using electrochemical impedance spectroscopy. The introduction of microorganisms and/or substrates into the supporting electrolyte led to a decrease in the slope and can be interpreted as evidence of their effect on the diffusion part of the double layer. Its contribution decreases in favor of ion transport. All this, in general, does not contradict the assumption of cell adsorption on the electrode surface. Confocal laser scanning microscopy confirmed this assumption and showed cell adhesion to the surface. The data obtained confirm the importance of bioelectrochemical processes of the studied group of microorganisms in biotechnological processes associated with the leaching of metals from sulfide ores.
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Affiliation(s)
| | - A. G. Bulaev
- Winogradsky Institute of Microbiology, Research Center of Biotechnology of the Russian Academy of Sciences, Moscow, Russia
| | - D. I. Stom
- Irkutsk State University, Irkutsk, Russia
- Baikal Museum of Irkutsk Scientific Center SB RAS, Listvyanka, Russia
- Irkutsk National Research Technical University, Irkutsk, Russia
| | | | - A. A. Ramonova
- Faculty of Biology, M.V. Lomonosov Moscow State University, Moscow, Russia
| | | | | | | | - A. B. Kupchinsky
- Baikal Museum of Irkutsk Scientific Center SB RAS, Listvyanka, Russia
| | - M. Yu. Tolstoy
- Irkutsk National Research Technical University, Irkutsk, Russia
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Staicu LC, Wójtowicz PJ, Molnár Z, Ruiz-Agudo E, Gallego JLR, Baragaño D, Pósfai M. Interplay between arsenic and selenium biomineralization in Shewanella sp. O23S. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2022; 306:119451. [PMID: 35569621 DOI: 10.1016/j.envpol.2022.119451] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Revised: 05/04/2022] [Accepted: 05/07/2022] [Indexed: 06/15/2023]
Abstract
Bacteria play crucial roles in the biogeochemical cycle of arsenic (As) and selenium (Se) as these elements are metabolized via detoxification, energy generation (anaerobic respiration) and biosynthesis (e.g. selenocysteine) strategies. To date, arsenic and selenium biomineralization in bacteria were studied separately. In this study, the anaerobic metabolism of As and Se in Shewanella sp. O23S was investigated separately and mixed, with an emphasis put on the biomineralization products of this process. Multiple analytical techniques including ICP-MS, TEM-EDS, XRD, Micro-Raman, spectrophotometry and surface charge (zeta potential) were employed. Shewanella sp. O23S is capable of reducing selenate (SeO42-) and selenite (SeO32-) to red Se(-S)0, and arsenate (AsO43-) to arsenite (AsO33-). The release of H2S from cysteine led to the precipitation of AsS minerals: nanorod AsS and granular As2S3. When As and Se oxyanions were mixed, both As-S and Se(-S)0 biominerals were synthesized. All biominerals were extracellular, amorphous and presented a negative surface charge (-24 to -38 mV). Kinetic analysis indicated the following reduction yields: SeO32- (90%), AsO43- (60%), and SeO42- (<10%). The mix of SeO32- with AsO43- led to a decrease in As removal to 30%, while Se reduction yield was unaffected (88%). Interestingly, SeO42- incubated with AsO43- boosted the Se removal (71%). The exclusive extracellular formation of As and Se biominerals might indicate an extracellular respiratory process characteristic of various Shewanella species and strains. This is the first study documenting a complex interplay between As and Se oxyanions: selenite decreased arsenate reduction, whereas arsenate stimulated selenate reduction. Further investigation needs to clarify whether Shewanella sp. O23S employs multi-substrate respiratory enzymes or separate, high affinity enzymes for As and Se oxyanion respiration.
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Affiliation(s)
- Lucian C Staicu
- Faculty of Biology, University of Warsaw, Miecznikowa 1, 02-096, Warsaw, Poland.
| | - Paulina J Wójtowicz
- Faculty of Biology, University of Warsaw, Miecznikowa 1, 02-096, Warsaw, Poland
| | - Zsombor Molnár
- Research Institute of Biomolecular and Chemical Engineering, University of Pannonia, Egyetem u. 10, H-8200, Veszprém, Hungary; ELKH-PE Environmental Mineralogy Research Group, University of Pannonia, Egyetem u. 10, H-8200, Veszprém, Hungary
| | | | - José Luis R Gallego
- Environmental Biogeochemistry & Raw Materials Group and INDUROT, Campus de Mieres, University of Oviedo, C/Gonzalo Gutiérrez Quirós. S/N, 33600, Mieres, Spain
| | - Diego Baragaño
- Environmental Biogeochemistry & Raw Materials Group and INDUROT, Campus de Mieres, University of Oviedo, C/Gonzalo Gutiérrez Quirós. S/N, 33600, Mieres, Spain
| | - Mihály Pósfai
- Research Institute of Biomolecular and Chemical Engineering, University of Pannonia, Egyetem u. 10, H-8200, Veszprém, Hungary; ELKH-PE Environmental Mineralogy Research Group, University of Pannonia, Egyetem u. 10, H-8200, Veszprém, Hungary
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Boase K, González C, Vergara E, Neira G, Holmes D, Watkin E. Prediction and Inferred Evolution of Acid Tolerance Genes in the Biotechnologically Important Acidihalobacter Genus. Front Microbiol 2022; 13:848410. [PMID: 35516430 PMCID: PMC9062700 DOI: 10.3389/fmicb.2022.848410] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Accepted: 02/28/2022] [Indexed: 11/18/2022] Open
Abstract
Acidihalobacter is a genus of acidophilic, gram-negative bacteria known for its ability to oxidize pyrite minerals in the presence of elevated chloride ions, a capability rare in other iron-sulfur oxidizing acidophiles. Previous research involving Acidihalobacter spp. has focused on their applicability in saline biomining operations and their genetic arsenal that allows them to cope with chloride, metal and oxidative stress. However, an understanding of the molecular adaptations that enable Acidihalobacter spp. to thrive under both acid and chloride stress is needed to provide a more comprehensive understanding of how this genus can thrive in such extreme biomining conditions. Currently, four genomes of the Acidihalobacter genus have been sequenced: Acidihalobacter prosperus DSM 5130T, Acidihalobacter yilgarnensis DSM 105917T, Acidihalobacter aeolianus DSM 14174T, and Acidihalobacter ferrooxydans DSM 14175T. Phylogenetic analysis shows that the Acidihalobacter genus roots to the Chromatiales class consisting of mostly halophilic microorganisms. In this study, we aim to advance our knowledge of the genetic repertoire of the Acidihalobacter genus that has enabled it to cope with acidic stress. We provide evidence of gene gain events that are hypothesized to help the Acidihalobacter genus cope with acid stress. Potential acid tolerance mechanisms that were found in the Acidihalobacter genomes include multiple potassium transporters, chloride/proton antiporters, glutamate decarboxylase system, arginine decarboxylase system, urease system, slp genes, squalene synthesis, and hopanoid synthesis. Some of these genes are hypothesized to have entered the Acidihalobacter via vertical decent from an inferred non-acidophilic ancestor, however, horizontal gene transfer (HGT) from other acidophilic lineages is probably responsible for the introduction of many acid resistance genes.
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Affiliation(s)
- Katelyn Boase
- Curtin Medical School, Curtin University, Perth, WA, Australia
| | - Carolina González
- Center for Bioinformatics and Genome Biology, Centro Ciencia & Vida, Santiago, Chile
| | - Eva Vergara
- Center for Bioinformatics and Genome Biology, Centro Ciencia & Vida, Santiago, Chile
| | - Gonzalo Neira
- Center for Bioinformatics and Genome Biology, Centro Ciencia & Vida, Santiago, Chile
| | - David Holmes
- Center for Bioinformatics and Genome Biology, Centro Ciencia & Vida, Santiago, Chile
- Facultad de Medicina y Ciencias, Universidad San Sebastián, Santiago, Chile
- *Correspondence: David S. Holmes,
| | - Elizabeth Watkin
- Curtin Medical School, Curtin University, Perth, WA, Australia
- Elizabeth Watkin,
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