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Scientific Reports Nov 2021Sulfamethoxazole (SMX) is the most commonly used antibiotic in worldwide for inhibiting aquatic animal diseases. However, the residues of SMX are difficult to eliminate...
Sulfamethoxazole (SMX) is the most commonly used antibiotic in worldwide for inhibiting aquatic animal diseases. However, the residues of SMX are difficult to eliminate and may enter the food chain, leading to considerable threats on human health. The bacterial strain Sphingobacterium mizutaii LLE5 was isolated from activated sludge. This strain could utilize SMX as its sole carbon source and degrade it efficiently. Under optimal degradation conditions (30.8 °C, pH 7.2, and inoculum amount of 3.5 × 10 cfu/mL), S. mizutaii LLE5 could degrade 93.87% of 50 mg/L SMX within 7 days. Four intermediate products from the degradation of SMX were identified and a possible degradation pathway based on these findings was proposed. Furthermore, S. mizutaii LLE5 could also degrade other sulfonamides. This study is the first report on (1) degradation of SMX and other sulfonamides by S. mizutaii, (2) optimization of biodegradation conditions via response surface methodology, and (3) identification of sulfanilamide, 4-aminothiophenol, 5-amino-3-methylisoxazole, and aniline as metabolites in the degradation pathway of SMX in a microorganism. This strain might be useful for the bioremediation of SMX-contaminated environment.
Topics: Anti-Bacterial Agents; Bacteria; Biodegradation, Environmental; Carbon; Environmental Microbiology; High-Throughput Nucleotide Sequencing; Kinetics; Metabolic Networks and Pathways; Phylogeny; RNA, Ribosomal, 16S; Sewage; Sphingobacterium; Sulfamethoxazole; Sulfonamides; Temperature; Water Pollutants, Chemical
PubMed: 34848765
DOI: 10.1038/s41598-021-02404-x -
Journal of Hazardous Materials Jun 2021The fate of doxycycline (DC), a second generation tetracycline antibiotic, in the environment has drawn increasing attention in recent years due to its wide usage....
The fate of doxycycline (DC), a second generation tetracycline antibiotic, in the environment has drawn increasing attention in recent years due to its wide usage. Little is known about the biodegradability of DC in the environment. The objective of this study was to characterize the biotransformation of DC by pure bacterial strains with respect to reaction kinetics under different environmental conditions and biotransformation products. Two bacterial strains, Brevundimonas naejangsanensis DD1 and Sphingobacterium mizutaii DD2, were isolated from chicken litter and characterized for their biotransformation capability of DC. Results show both strains rely on cometabolism to biotransform DC with tryptone as primary growth substrate. DD2 had higher biotransformation kinetics than DD1. The two strains prefer similar pHs (7 and 8) and temperature (30 °C), however, they exhibited opposite responses to increasing background tryptone concentration. While hydrolysis converted DC to its isomer or epimer, the two bacterial strains converted DC to various biotransformation products through a series of demethylation, dehydration, decarbonylation and deamination. Findings from the study can be used to better predict the fate of DC in the environment.
Topics: Biotransformation; Caulobacteraceae; Doxycycline; Sphingobacterium
PubMed: 33486232
DOI: 10.1016/j.jhazmat.2021.125126 -
Environmental Pollution (Barking, Essex... Jul 2022Contamination by tetracycline residues has adverse influences on the environment and is considered a pressing issue. Biodegradation is regarded as a promising way to...
Contamination by tetracycline residues has adverse influences on the environment and is considered a pressing issue. Biodegradation is regarded as a promising way to treat tetracycline residues in the environment. Here, strain Sphingobacterium mizutaii S121, which could degrade 20 mg/L tetracycline completely within 5 days, was isolated from contaminated soil. The characteristics of tetracycline degradation by strain S121 were investigated under various culture conditions. Response surface methodology was used to predict the maximum tetracycline degradation ratio, which can be obtained under the following conditions: 31.36 °C, pH of 7.15, and inoculum volume of 5.5% (v/v). Furthermore, extracellular tetracycline biodegradation products and intracellular metabolic pathways of S121 were detected by ultraperformance liquid chromatography-quadrupole-time-of-flight-mass spectrometry (UPLC-Q-TOF-MS) and UHPLC-quadrupole electrospray (QE)-MS, respectively. The results identified eight possible degradation products, and three putative degradation pathways were proposed. In addition, exposure to tetracycline produced significant influences on metabolic pathways such as pyrimidine, purine, taurine and hypotaurine metabolism and lysine degradation. Consequently, the intracellular metabolic pathway response of S121 in the presence of tetracycline was proposed. These findings are presented for the first time, which will facilitate a comprehensive understanding of the mechanism of tetracycline degradation. Moreover, strain S121 can be a promising bacterium for tetracycline bioremediation.
Topics: Anti-Bacterial Agents; Biodegradation, Environmental; Metabolomics; Sphingobacterium; Tetracycline
PubMed: 35430309
DOI: 10.1016/j.envpol.2022.119299 -
Scientific Reports Dec 2021
PubMed: 34907267
DOI: 10.1038/s41598-021-03738-2 -
International Journal of Systematic and... Nov 2012Two clinical strains, NF 296 and NF 931, present in our collection, were identified biochemically as members of CDC group II-i. Determination of the 16S rRNA gene...
Isolates belonging to CDC group II-i belong predominantly to Sphingobacterium mizutaii Yabuuchi et al. 1983: emended descriptions of S. mizutaii and of the genus Sphingobacterium.
Two clinical strains, NF 296 and NF 931, present in our collection, were identified biochemically as members of CDC group II-i. Determination of the 16S rRNA gene sequence revealed highest similarity with strains of Sphingobacterium mizutaii. Because these strains produced indole, whereas S. mizutaii has been described as indole-negative, we also investigated the type strain and a reference strain of S. mizutaii, LMG 8340(T) (=CCUG 15907(T)) and LMG 8341 (=CCUG 15908), and found both strains also to be positive for indole production. These data warrant inclusion of some of the CDC group II-i strains into S. mizutaii and emended descriptions of Sphingobacterium mizutaii as indole-production-positive and of the genus Sphingobacterium as variable for indole production.
Topics: Bacterial Typing Techniques; DNA, Bacterial; Fatty Acids; Indoles; Molecular Sequence Data; Phylogeny; RNA, Ribosomal, 16S; Sequence Analysis, DNA; Sphingobacterium
PubMed: 22199213
DOI: 10.1099/ijs.0.037325-0 -
International Journal of Systematic and... Nov 2012A Gram-reaction-negative, strictly aerobic, rod-shaped, non-motile strain, designated 2-1-2(T), was isolated from perchloroethylene/trichloroethene-contaminated soil in...
Sphingobacterium kyonggiense sp. nov., isolated from chloroethene-contaminated soil, and emended descriptions of Sphingobacterium daejeonense and Sphingobacterium mizutaii.
A Gram-reaction-negative, strictly aerobic, rod-shaped, non-motile strain, designated 2-1-2(T), was isolated from perchloroethylene/trichloroethene-contaminated soil in Suwon, South Korea. A polyphasic approach was used to study the taxonomic position of strain 2-1-2(T). Strain 2-1-2(T) showed highest 16S rRNA gene sequence similarities to Sphingobacterium daejeonense TR6-04(T) (97.9%) and Sphingobacterium mizutaii ATCC 33299(T) (97.1%); sequence similarities to other Sphingobacterium species were less than 93.0%. Phylogenetic analysis based on 16S rRNA gene sequences showed that strain 2-1-2(T) belonged to the clade formed by members of the genus Sphingobacterium in the family Sphingobacteriaceae. The G+C content of the genomic DNA was 36.6 mol%. Strain 2-1-2(T) showed the typical chemotaxonomic features of the genus Sphingobacterium, with the presence of a ceramide phosphorylethanolamine (CerPE-2) as the major ceramide, menaquinone 7 (MK-7) as the predominant respiratory quinone and iso-C(15:0), iso-C(17:0) 3-OH and summed feature 3 (comprising iso-C(15:0) 2-OH and/or C(16:1)ω7c) as the major fatty acids. On the basis of phylogenetic inference, fatty acid profile and other phenotypic properties, and DNA-DNA relatedness, strain 2-1-2(T) represents a novel species of the genus Sphingobacterium, for which the name Sphingobacterium kyonggiense sp. nov. is proposed; the type strain is 2-1-2(T) (=KEMC 2241-005(T)=JCM 16704(T)). Emended descriptions of Sphingobacterium daejeonense and Sphingobacterium mizutaii are also proposed.
Topics: Bacterial Typing Techniques; Base Composition; Ceramides; DNA, Bacterial; Fatty Acids; Molecular Sequence Data; Phylogeny; RNA, Ribosomal, 16S; Republic of Korea; Sequence Analysis, DNA; Soil Microbiology; Soil Pollutants; Sphingobacterium; Tetrachloroethylene; Trichloroethylene; Vitamin K 2
PubMed: 22180612
DOI: 10.1099/ijs.0.024737-0 -
International Journal of Systematic and... May 2017The taxonomic position of two isolates belonging to the genus Sphingobacterium was determined. The first isolate, R-53603T, was obtained from purulent discharge from the...
The taxonomic position of two isolates belonging to the genus Sphingobacterium was determined. The first isolate, R-53603T, was obtained from purulent discharge from the toe of a cellulitis patient in Kuwait. Comparative 16S rRNA gene sequence analysis revealed 99.87 % similarity of R-53603T with environmental isolate P031 (=R-53745) originating from activated sludge in Singapore. The two isolates were phylogenetically positioned on the same sub-branch. Highest 16S rRNA gene sequence similarity was found with the type strains of Sphingobacterium mizutaii (98.23 %), Sphingobacterium lactis (97.78 %) and Sphingobacterium daejeonense (97.14 %). DNA-DNA hybridizations revealed <70 % relatedness between the two isolates and the type strains of the close phylogenetic neighbours S. mizutaii(18.0-24.5 %), S. lactis(20.3-25.9 %) and S. daejeonense(13.2-20.0 %). The high relative contribution of iso-C15 : 0, iso-C17 : 0 3-OH and summed feature 3 (iso-C15 : 0 2-OH and/or C16 : 1ω7c) in the cellular fatty acid profiles of R-53603T and R-53745, the presence of sphingophospholipids, MK-7 as the dominant menaquinone and phosphatidylethanolamine as the major polar lipid in strain R-53603T are typical chemotaxonomic characteristics for members of the genus Sphingobacterium. Phenotypic features most useful for differentiation of the two novel strains from the most closely related species S. mizutaii include growth on MacConkey agar, and utilization of stachyose, guanidine HCl and lithium chloride in Biolog GEN III tests. Strains R-53603T and R-53745 thus represent a novel species, for which the name Sphingobacterium cellulitidis sp. nov. is proposed. The type strain is R-53603T (=LMG 28764T=DSM 102028T).
Topics: Bacterial Typing Techniques; Base Composition; Cellulitis; DNA, Bacterial; Fatty Acids; Humans; Kuwait; Nucleic Acid Hybridization; Phospholipids; Phylogeny; RNA, Ribosomal, 16S; Sequence Analysis, DNA; Sewage; Singapore; Sphingobacterium; Toes; Vitamin K 2
PubMed: 28141505
DOI: 10.1099/ijsem.0.001832 -
International Journal of Systematic and... Mar 2020A Gram-stain-negative, rod-shaped, non-motile and non-spore-forming bacterium, designated HAL-9, was isolated from oil-contaminated soil in Daqing oilfield, Heilongjiang...
A Gram-stain-negative, rod-shaped, non-motile and non-spore-forming bacterium, designated HAL-9, was isolated from oil-contaminated soil in Daqing oilfield, Heilongjiang Province, PR China. Strain HAL-9 was able to degrade quizalofop--ethyl and diclofop-methyl. Growth was observed at 10-35 °C (optimum, 30 °C), pH 6.0-10.0 (optimum, pH 7.0) and salinity of 0 %-5.0 % (w/v; optimum 1.0 %). The results of phylogenetic analysis based on the 16S rRNA gene indicated that strain HAL-9 belongs to the genus and showed the highest sequence similarity (98.3 %) to Y3L14, followed by DSM 11724 (95.1 %) and DSM 22361 (95.1 %). Menaquinone-7 (MK-7) was the only isoprenoid quinone. The predominant cellular fatty acids were summed feature 3 (C 7 and/or C 6), iso-C and iso-C 3-OH. The major polar lipids were phosphatidylethanolamine, three phosphoglycolipids and three unidentified lipids. The draft genome of strain HAL-9 was 5.41 Mb. The G+C content of strain HAL-9 was 40.6 mol%. Furthermore, the average nucleotide identity and DNA-DNA hybridization values between strain HAL-9 and Y3L14 were 86.2 % and 32.8 %, respectively, which were below the standard thresholds for species differentiation. On the basis of phenotypic, genotypic and phylogenetic evidence, strain HAL-9 represents a novel species in the genus , for which the name sp. nov. is proposed. The type strain is HAL-9 (=ACCC 61581=CCTCC AB 2019176=KCTC 72287).
Topics: Bacterial Typing Techniques; Base Composition; China; DNA, Bacterial; Fatty Acids; Glycolipids; Nucleic Acid Hybridization; Petroleum Pollution; Phosphatidylethanolamines; Phospholipids; Phylogeny; RNA, Ribosomal, 16S; Sequence Analysis, DNA; Soil Microbiology; Sphingobacterium; Vitamin K 2
PubMed: 31967955
DOI: 10.1099/ijsem.0.004000 -
International Journal of Systematic and... Oct 2010A Gram-staining-negative, yellow-coloured, strictly aerobic, non-spore-forming, rod-shaped bacterium, designated HS39(T), isolated from a soil sample collected from a...
A Gram-staining-negative, yellow-coloured, strictly aerobic, non-spore-forming, rod-shaped bacterium, designated HS39(T), isolated from a soil sample collected from a natural Populus euphratica forest in Xinjiang, China, was characterized using a polyphasic approach. The isolate grew optimally at 30-37 °C, at pH 6.5-8.0 and with 0-3 % NaCl. Analysis of the 16S rRNA gene sequence of strain HS39(T) revealed that it is a member of the genus Sphingobacterium. Sphingobacterium mizutaii ATCC 33299(T) was the nearest relative (94.0 % 16S rRNA gene sequence similarity). The G+C content of the genomic DNA was 40.2 mol%. The major fatty acids were iso-C₁₅:₀, iso-C₁₇:₀ 3-OH and summed feature 3 (comprising C₁₆:₁ω6c and/or C₁₆:₁ω7c). The predominant isoprenoid quinone was MK-7. On the basis of phenotypic properties and phylogenetic inference, strain HS39(T) represents a novel species of the genus Sphingobacterium, for which the name Sphingobacterium shayense sp. nov. is proposed. The type strain is HS39(T) (=CCTCC AB 209006(T) =NRRL B-59203(T)).
Topics: Aerobiosis; Bacterial Typing Techniques; Base Composition; China; Cluster Analysis; DNA, Bacterial; DNA, Ribosomal; Fatty Acids; Hydrogen-Ion Concentration; Molecular Sequence Data; Phylogeny; Pigments, Biological; Populus; Quinones; RNA, Ribosomal, 16S; Sequence Analysis, DNA; Sodium Chloride; Soil Microbiology; Sphingobacterium; Temperature; Trees
PubMed: 19933581
DOI: 10.1099/ijs.0.018481-0 -
International Journal of Systematic and... Jul 2007A Gram-negative, strictly aerobic, short rod-shaped, non-motile bacterial strain designated 4M24(T) was isolated from cotton-waste compost. Analysis of the 16S rRNA gene...
A Gram-negative, strictly aerobic, short rod-shaped, non-motile bacterial strain designated 4M24(T) was isolated from cotton-waste compost. Analysis of the 16S rRNA gene sequence of strain 4M24(T) revealed that it is a member of the genus Sphingobacterium, sharing 88.5-94.5 % sequence similarity with type strains of the genus Sphingobacterium and being most closely related to Sphingobacterium daejeonense TR6-04(T) (94.5 % sequence similarity) and Sphingobacterium mizutaii ATCC 33299(T) (92.2 % similarity). The major fatty acids of strain 4M24(T) grown on trypticase soy agar medium were summed feature 3 (iso-C(15 : 0) 2-OH and/or C(16 : 1)omega7c; 37.5 %), iso-C(15 : 0) (29.5 %) and iso-C(17 : 0) 3-OH (19.7 %). The G+C content of the genomic DNA was 42.3 mol%. On the basis of phenotypic and genotypic characteristics, strain 4M24(T) represents a novel species of the genus Sphingobacterium, for which the name Sphingobacterium composti sp. nov. is proposed. The type strain is 4M24(T) (=KACC 11313(T)=DSM 18850(T)).
Topics: Aerobiosis; Bacterial Typing Techniques; Base Composition; DNA, Bacterial; DNA, Ribosomal; Fatty Acids; Genes, rRNA; Gossypium; Korea; Locomotion; Molecular Sequence Data; Phylogeny; RNA, Bacterial; RNA, Ribosomal, 16S; Sequence Analysis, DNA; Sequence Homology, Nucleic Acid; Soil; Soil Microbiology; Sphingobacterium
PubMed: 17625199
DOI: 10.1099/ijs.0.64948-0