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8 recordsLinked to original sources
PubMed2026

Pseudaquabacterium prasiolae sp. nov., Isolated from the Freshwater Green Alga Prasiola japonica, and Rubrivivax soli sp. nov., Isolated from Soil, with Reclassification of Aquabacterium humicola as Pseudaquabacterium humicola comb. nov.

Two Gram-stain-negative, catalase- and oxidase-positive, strictly aerobic, non-flagellated rod-shaped bacteria, designated OR-4T and RP6-9T, were isolated from the freshwater green alga Prasiola japonica and soil in Republic of Korea, respectively. Strain OR-4T exhibited gliding motility, whereas strain RP6-9T lacked gliding motility. Strain OR-4T grew at 10-30 °C, pH 6.0-9.0, and 0-1.5% (w/v) NaCl, while strain RP6-9T grew at 20-35 °C, pH 6.0-9.0, and 0-1.0% (w/v) NaCl. Both strains contained ubiquinone-8 as the sole respiratory quinone and phosphatidylethanolamine, phosphatidylglycerol, and diphosphatidylglycerol as major polar lipids; strain OR-4T additionally possessed an unidentified phospholipid and an unidentified polar lipid. The predominant fatty acids of OR-4T were C12:0, C16:0, summed feature 3 (C16:1ω6c and/or C16:1ω7c), and summed feature 8 (C18:1ω7c and/or C18:1ω6c), whereas RP6-9T contained C12:0, C16:0, and summed feature 3 as major components. The genomic DNA G + C content of both strains was 71.0 mol%. Whole-genome-based phylogenomic analyses placed OR-4T and RP6-9T within the genera Pseudaquabacterium and Rubrivivax, respectively, forming distinct lineages. Comparative analyses of average nucleotide identity, digital DNA-DNA hybridization, and average amino acid identity further supported their assignment to these genera while confirming their separation from previously described species. Based on combined phenotypic, chemotaxonomic, and genomic evidence, strains OR-4T and RP6-9T represent novel species, for which the names Pseudaquabacterium prasiolae sp. nov. (type strain OR-4T =KACC 22752T =NBRC 116024T) and Rubrivivax soli sp. nov. (type strain RP6-9T =KACC 24055T =DSM 119932T) are proposed. Phylogenomic analyses also support the reclassification of Aquabacterium humicola as Pseudaquabacterium humicola comb. nov. (type strain RJY3T =KCTC 92105T =NBRC 115831T).

Phylogeny↗
PubMed2026

Vibrio phycocola sp. nov. and Vibrio phycohabitans sp. nov., Isolated from the Phycosphere of Marine Algae.

Two Gram-stain-negative, facultatively aerobic, oxidase- and catalase-positive, motile (by means of a polar flagellum) rod-shaped bacterial strains, designated BS-M-Sm-2T and MA40-2T, were isolated from marine algae. Growth was optimal at pH 7.0-8.0 and 2.0-3.0% (w/v) NaCl, with temperature optima of 25°C for BS-M-Sm-2T and 25-30°C for MA40-2T. Ubiquinone-8 was the sole respiratory quinone. The major fatty acids common to both strains were C16:0, summed feature 3 (C16:1 ω7c and/or C16:1 ω6c), and summed feature 8 (C18:1 ω7c and/or C18:1 ω6c), while BS-M-Sm-2T additionally contained C12:0 and C14:0. The predominant polar lipids were phosphatidylethanolamine and phosphatidylglycerol, with diphosphatidylglycerol also detected in strain MA40-2T. The DNA G+C contents of strains BS-M-Sm-2T and MA40-2T were 44.2 and 39.8 mol%, respectively. The 16S rRNA gene sequence similarity, average nucleotide identity (ANI), and digital DNA-DNA hybridization (dDDH) values between the two strains were 93.8%, 71.4%, and 23.2%, respectively. Phylogenetic and phylogenomic analyses placed both strains within the genus Vibrio, forming distinct lineages. Comparisons with closely related Vibrio type strains yielded ANI and dDDH values below 91.6% and 44.3%, respectively, further supporting their classification as novel species. Genome analyses revealed genes potentially involved in algal symbiosis, including those for polysaccharide degradation and vitamin biosynthesis. Based on comprehensive genomic, phylogenetic, phenotypic, and chemotaxonomic evidence, strains BS-M-Sm-2T and MA40-2T represent two novel species, for which the names Vibrio phycocola sp. nov. (BS-M-Sm-2T =KACC 24066T =DSM 119941T) and Vibrio phycohabitans sp. nov. (MA40-2T =KACC 24064T = DSM 119942T) are proposed.

RNA, Ribosomal, 16S↗
PubMed2026

Pseudomonas gebzensis sp. nov., a Carotenoid-Producing Species Isolated from Solar Panels in Türkiye.

Strain RP23018ST was isolated from the solar panels in Gebze, Türkiye. According to the phylogenetic analysis of 16S rRNA gene sequences, strain RP23018ST was classified as a member of the genus Pseudomonas, being most closely related to Pseudomonas cremoricolorata DSM 17059T (99.3%). Strain RP23018ST was Gram-stain-negative, rod-shaped, aerobic, motile, growing between temperature range of 4–35 °C. The polar lipids of strain RP23018ST consisted of phosphatidylethanolamine, di-phosphatidylglycerol, phosphatidylcholine, one unidentified phospholipid, and three unidentified aminolipids. It was determined that the main respiratory quinone of the RP23018ST strain was ubiquinone-9 (Q-9), which is a typical chemotaxonomic characteristic of the genus Pseudomonas. Major fatty acids were C16:0, summed feature 3 (C16:1 ω6c and/or C16:1 ω7c), summed feature 8 (C18:1 ω6c and/or C18:1 ω7c), and C17:0 cyclo. Strain RP23018ST had a genome size of 4,944,510 bp and a G + C ratio of 63.0%. The average nucleotide identity (ANI) and digital DNA–DNA hybridization (dDDH) values between RP23018ᵀ and related Pseudomonas species were below 86.4% and 26.7%, respectively, clearly falling below the thresholds for species delineation. Strain RP23018ST produced a deep yellow carotenoid pigment with absorption maxima at 455 and 482 nm. Genome annotation revealed key carotenoid biosynthesis genes (crtX, crtY, crtI, crtZ), and the extracted pigment showed antioxidant activity in DPPH and FRAP assays. Polyphasic characterization, including the determination of overall genome relatedness indices, revealed that strain RP23018ST represents a novel species of the genus Pseudomonas, for which the name Pseudomonas gebzensis sp. nov. is proposed. The type strain is RP23018ST (= LMG 33436T = DSM 117295T).

Turkey↗
PubMed2026

Isolation and characterization of two novel species Neorhizobium fuzhouense sp. nov. and Neotabrizicola paludis sp. nov.

Two novel aerobic bacterial strains, designated SGZ-38T and sgz301269T, were isolated from the root of Pennisetum sp. and paddy soil, respectively. Strain SGZ-38T grew at 10-40 ℃ (optimum 30 °C) and pH 5.0-12.0 (optimum 6.5) and tolerated up to 1.0% NaCl (w/v), whereas strain sgz301269T grew at 15-37 °C (optimum 30 °C), pH 5.0-9.5 (optimum 7.0) and 0-2% NaCl (optimum 0%). Phylogenetic trees based on the 16S rRNA gene and genomes placed both strains into distinct lineages, forming separated clades from their closest relatives. Strain SGZ-381T exhibited the highest 16S rRNA gene similarities to "Neorhizobium deserti" ACCC 61627T (97.4%), and strain sgz301269T had the highest 16S rRNA gene sequence similarity to Neotabrizicola shimadae N10T (97.6%). The respiratory quinone in both strains was ubiquinone-10. The main fatty acids of SGZ-381T were Summed feature 8, Summed feature 2 and C16:0, whereas strain sgz301269T included C10:0 3OH, C18:0 3OH and Summed feature 8. The DNA G+C content of SGZ-381T and sgz301269T was 62.1% and 65.5%, respectively. The average nucleotide identity and digital DNA-DNA hybridization values between each strain and their respective closest species were 74.6% and 20.1%, 75.3% and 17.4% respectively, below the thresholds for species delineation. Based on the comprehensive chemotaxonomic, phylogenetic, and phenotypic evidence, proposed names of the novel strains are Neorhizobium fuzhouense sp. nov. (type strain SGZ-381T=GDMCC1.4207T=JCM 36770T), Neotabrizicola paludis sp. nov. (type strain sgz301269T=MCCC 1K09178T=KCTC 8856T).

Bacterial Typing Techniques↗
PubMed2026

Albidovulum molybdatiresistens sp. nov., a molybdate-resistant bacterium isolated from river water.

A Gram-stain-negative, aerobic, non-motile, catalase- and oxidase-positive, white rod-shaped strain, RF13T, was isolated from water samples of the Qingliang River in Fucheng County, Hebei Province, China, and was grown at 15-42 °C (optimum 35 °C), pH 6.0-8.0 (optimum pH 7), and 0-0.5% (w/v) NaCl (optimum concentration 0%). Phylogenetic analysis based on 16S rRNA gene sequences showed that strain RF13T belonged to the genus Albidovulum, with closest sequence similarity to Albidovulum salinarum MCCC 1K0602T (97.2%), Frigidibacter oleivorans CGMCC 1.3778T (97.2%), Allgaiera indica MCCC 1A01802T (96.8%), and Pseudothioclava arenosa KCTC 52190T (96.4%). The genome size of strain RF13T was 3.7 Mb, and the DNA G+C content was 64.6%. The DNA-DNA hybridisation value (dDDH), average nucleotide identity (ANI), and average amino acid identity (AAI) between strain RF13T and the reference strain were less than 20.0%, 78.8%, and 72.8%, respectively. Chemotaxonomic analysis revealed Summed feature 8 (48.4%) (C18:1 ω6c and/or C18:1 ω7c), C18:1 ω7c 11-methyl (22.1%), C18:0 3OH (7.9%), and C10:0 3OH (5.0%) as predominant fatty acids. The polar lipids consisted of phosphatidylglycerol, diphosphatidylglycerol, two unidentified aminolipids, two unidentified phospholipids, and three unidentified lipids. The predominant isoprenoid quinone was ubiquinone-10 (Q-10), and a small amount of Q-9 was also detected. In addition, strain RF13T exhibited a minimum inhibitory concentration (MIC) of 20 mM for molybdate in R2A broth medium and was capable of reducing molybdate to molybdenum blue. Based on the results of biochemical, physiological, phylogenetic, and chemotaxonomic analyses, combined with 16S rRNA gene sequence analyses and draft genome sequence comparisons, strain RF13T was considered to represent a novel species of the genus Albidovulum, and was therefore named Albidovulum molybdatiresistens sp. nov. The type strain was RF13T (= GDMCC 1.3414T= JCM 35643T).

Phylogeny↗
PubMed2026

Plasticity of hepatic metabolism in Arctic char (Salvelinus alpinus) in response to cyclic hypoxia.

The emergence of cyclic hypoxia puts aquatic organisms' homeostasis under significant strain. Energetic metabolism as well as protein synthesis and folding are particularly altered during hypoxia, while reoxygenation imposes an oxidative challenge. Currently, little is known about how hypoxia-sensitive organisms respond to large oxygen fluctuations. Our previous work on Arctic char revealed that this salmonid, despite being strongly affected by acute hypoxia and reoxygenation (H/R), can successfully reestablish homeostasis, notably through adjustments to hepatic mitochondrial metabolism. However, the mechanisms underlying this acclimation remain poorly understood. We hypothesized that Arctic char remodel their hepatic proteome to optimize energy metabolism, reorganize oxygen-demanding pathways, and maintain cellular homeostasis during repeated H/R cycles. By exposing Arctic char to two or fifteen days of diel cyclic hypoxia, we confirmed this species' limited capacity to respond to acute H/R. Nevertheless, after fifteen cycles, fish adjusted their energetic metabolism through coordinated regulation of carbohydrate and lipid pathways and upregulation of amino acid metabolism. Mitochondrial metabolism was strongly reorganized, particularly at the ubiquinone-Complex III interaction level, alongside adjustments in proline utilization and protein processing. Moreover, protein processing and folding pathways were stimulated in both mitochondria and the endoplasmic reticulum. However, chronic cyclic hypoxia may still promote non-mitochondrial ROS production, DNA replication stress, and impaired immune function. This study highlights how a hypoxia-sensitive fish progressively reorganizes its metabolism and oxygen-demanding pathways to establish a phenotype adapted to chronic cyclic hypoxia, while also revealing the physiological costs associated with this acclimation.

Animals↗
PubMed2025

Synergistic targeting of cancer cells through simultaneous inhibition of key metabolic enzymes.

As cancer cell specific rewiring of metabolic networks creates potential therapeutic opportunities, we conducted a synthetic lethal screen utilizing inhibitors of metabolic pathways. Simultaneous administration of (R)-GNE-140 and BMS-986205 (Linrodostat) preferentially halted proliferation of ovarian cancer cells, but not of their non-oncogenically transformed progenitor cells. While (R)-GNE-140 inhibits lactate dehydrogenase (LDH)A/B and thus effective glycolysis, BMS-986205, in addition to its known inhibitory activity on Indoleamine 2,3-dioxygenase (IDO1), also restricts oxidative phosphorylation (OXPHOS), as revealed here. BMS-986205, which is being tested in multiple Phase III clinical trials, inhibits the ubiquinone reduction site of respiratory complex I and thus compromises mitochondrial ATP production. The energetic catastrophe caused by simultaneous interference with glycolysis and OXPHOS resulted in either cell death or the induction of senescence in tumor cells, with the latter being eliminated by senolytics. The frequent synergy observed with combined inhibitor treatment was comprehensively confirmed through testing on tumor cell lines from the DepMap panel and on human colorectal cancer organoids. These experiments revealed highly synergistic activity of the compounds in a third of the tested tumor cell lines, correlating with alterations in genes with known roles in metabolic regulation and demonstrating the therapeutic potential of metabolic intervention.

Humans↗
PubMed2025

The FIBRILLIN multigene family in tomato, their roles in plastoglobuli structure and metabolism.

Plastoglobuli (PG) are plant lipoprotein compartments, present in plastid organelles. They are involved in the formation and/or storage of lipophilic metabolites. FIBRILLINs (FBNs) are one of the main PG-associated proteins and are particularly abundant in carotenoid-enriched chromoplasts found in ripe fruits and flowers. To address the contribution of different FBNs, independently and in combination, to isoprenoid formation and sequestration, a multiplex gene editing approach was undertaken in tomato. This approach generated a suite of single and high-order fbn mutants that were shown to lack transcripts and respective protein products. The major PG-related FBNs in tomato chosen for this study are SlFBN1, SlFBN2a, SlFBN4 and SlFBN7a. When knocked out independently, functional redundancy was revealed. However, paralog-specific roles were detected regulating specific isoprenoids (e.g. plastochromanol 8) or plastidial esterification capability. In addition, high-order fbn mutants displayed altered isoprenoid chromoplast sequestration patterns, notably with a significant reduction in carotenes (phytoene and phytofluene) in the PG fraction. Proteomic analysis confirmed the absence of PG-core associated proteins, including NAD(P)H-ubiquinone oxidoreductase C1, tocopherol cyclase (VTE1) and phytol esterase (PES1/PYP). Perturbations to the ultrastructure of the plastid were revealed, with aberrant PG formation and morphology predominating in high-order mutants. Global lipidome profiles also highlighted broader changes directly affecting storage and plastid membrane lipids, for example, tri- and diacylglycerides and galactolipid species. Collectively, these results support both structural and metabolic roles of SlFBNs in PGs. The findings expose fundamental aspects of metabolic compartmentalisation in plant cells and the importance of lipoprotein particles for plastid integrity and functionality.

Solanum lycopersicum↗