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1.
Nat Commun ; 11(1): 4963, 2020 10 02.
Artículo en Inglés | MEDLINE | ID: mdl-33009406

RESUMEN

Bacterial nanotubes are membranous structures that have been reported to function as conduits between cells to exchange DNA, proteins, and nutrients. Here, we investigate the morphology and formation of bacterial nanotubes using Bacillus subtilis. We show that nanotube formation is associated with stress conditions, and is highly sensitive to the cells' genetic background, growth phase, and sample preparation methods. Remarkably, nanotubes appear to be extruded exclusively from dying cells, likely as a result of biophysical forces. Their emergence is extremely fast, occurring within seconds by cannibalizing the cell membrane. Subsequent experiments reveal that cell-to-cell transfer of non-conjugative plasmids depends strictly on the competence system of the cell, and not on nanotube formation. Our study thus supports the notion that bacterial nanotubes are a post mortem phenomenon involved in cell disintegration, and are unlikely to be involved in cytoplasmic content exchange between live cells.


Asunto(s)
Bacillus subtilis/citología , Bacillus subtilis/metabolismo , Viabilidad Microbiana , Nanotubos/química , Bacillus subtilis/genética , Bacillus subtilis/ultraestructura , Conjugación Genética , ADN Bacteriano/genética , Plásmidos/genética
2.
Nat Commun ; 11(1): 4918, 2020 10 01.
Artículo en Inglés | MEDLINE | ID: mdl-33004800

RESUMEN

In order to control and eradicate epidemic cholera, we need to understand how epidemics begin, how they spread, and how they decline and eventually end. This requires extensive sampling of epidemic disease over time, alongside the background of endemic disease that may exist concurrently with the epidemic. The unique circumstances surrounding the Argentinian cholera epidemic of 1992-1998 presented an opportunity to do this. Here, we use 490 Argentinian V. cholerae genome sequences to characterise the variation within, and between, epidemic and endemic V. cholerae. We show that, during the 1992-1998 cholera epidemic, the invariant epidemic clone co-existed alongside highly diverse members of the Vibrio cholerae species in Argentina, and we contrast the clonality of epidemic V. cholerae with the background diversity of local endemic bacteria. Our findings refine and add nuance to our genomic definitions of epidemic and endemic cholera, and are of direct relevance to controlling current and future cholera epidemics.


Asunto(s)
Cólera/microbiología , Enfermedades Endémicas/prevención & control , Genoma Bacteriano/genética , Pandemias/prevención & control , Vibrio cholerae/genética , Argentina/epidemiología , Cólera/epidemiología , Cólera/prevención & control , ADN Bacteriano/genética , ADN Bacteriano/aislamiento & purificación , Historia del Siglo XIX , Historia del Siglo XX , Humanos , Anotación de Secuencia Molecular , Pandemias/historia , Filogenia , Polimorfismo de Nucleótido Simple , Análisis de Secuencia de ADN , Vibrio cholerae/aislamiento & purificación , Vibrio cholerae/patogenicidad
3.
Nat Commun ; 11(1): 4915, 2020 10 01.
Artículo en Inglés | MEDLINE | ID: mdl-33004811

RESUMEN

A phenotype of Escherichia coli and Klebsiella pneumoniae, resistant to piperacillin/tazobactam (TZP) but susceptible to carbapenems and 3rd generation cephalosporins, has emerged. The resistance mechanism associated with this phenotype has been identified as hyperproduction of the ß-lactamase TEM. However, the mechanism of hyperproduction due to gene amplification is not well understood. Here, we report a mechanism of gene amplification due to a translocatable unit (TU) excising from an IS26-flanked pseudo-compound transposon, PTn6762, which harbours blaTEM-1B. The TU re-inserts into the chromosome adjacent to IS26 and forms a tandem array of TUs, which increases the copy number of blaTEM-1B, leading to TEM-1B hyperproduction and TZP resistance. Despite a significant increase in blaTEM-1B copy number, the TZP-resistant isolate does not incur a fitness cost compared to the TZP-susceptible ancestor. This mechanism of amplification of blaTEM-1B is an important consideration when using genomic data to predict susceptibility to TZP.


Asunto(s)
Antibacterianos/farmacología , Farmacorresistencia Bacteriana Múltiple/genética , Infecciones por Escherichia coli/tratamiento farmacológico , Proteínas de Escherichia coli/genética , Escherichia coli/genética , beta-Lactamasas/genética , Antibacterianos/uso terapéutico , Cromosomas Bacterianos/genética , Elementos Transponibles de ADN/genética , ADN Bacteriano/genética , Quimioterapia Combinada/métodos , Escherichia coli/efectos de los fármacos , Escherichia coli/aislamiento & purificación , Infecciones por Escherichia coli/microbiología , Amplificación de Genes , Regulación Bacteriana de la Expresión Génica , Genoma Bacteriano/genética , Humanos , Pruebas de Sensibilidad Microbiana , Piperacilina/farmacología , Piperacilina/uso terapéutico , Polimorfismo de Longitud del Fragmento de Restricción , ARN Ribosómico 16S/genética , Tazobactam/farmacología , Tazobactam/uso terapéutico , Secuenciación Completa del Genoma
4.
Nat Commun ; 11(1): 4522, 2020 09 09.
Artículo en Inglés | MEDLINE | ID: mdl-32908144

RESUMEN

A unique, protective cell envelope contributes to the broad drug resistance of the nosocomial pathogen Acinetobacter baumannii. Here we use transposon insertion sequencing to identify A. baumannii mutants displaying altered susceptibility to a panel of diverse antibiotics. By examining mutants with antibiotic susceptibility profiles that parallel mutations in characterized genes, we infer the function of multiple uncharacterized envelope proteins, some of which have roles in cell division or cell elongation. Remarkably, mutations affecting a predicted cell wall hydrolase lead to alterations in lipooligosaccharide synthesis. In addition, the analysis of altered susceptibility signatures and antibiotic-induced morphology patterns allows us to predict drug synergies; for example, certain beta-lactams appear to work cooperatively due to their preferential targeting of specific cell wall assembly machineries. Our results indicate that the pathogen may be effectively inhibited by the combined targeting of multiple pathways critical for envelope growth.


Asunto(s)
Infecciones por Acinetobacter/tratamiento farmacológico , Acinetobacter baumannii/genética , Antibacterianos/farmacología , Proteínas Bacterianas/antagonistas & inhibidores , Infección Hospitalaria/tratamiento farmacológico , Farmacorresistencia Bacteriana Múltiple/genética , Infecciones por Acinetobacter/microbiología , Acinetobacter baumannii/efectos de los fármacos , Antibacterianos/uso terapéutico , Proteínas Bacterianas/genética , Proteínas Bacterianas/metabolismo , Pared Celular/efectos de los fármacos , Pared Celular/genética , Pared Celular/metabolismo , Infección Hospitalaria/microbiología , Análisis Mutacional de ADN , Elementos Transponibles de ADN/genética , ADN Bacteriano/genética , Farmacorresistencia Bacteriana Múltiple/efectos de los fármacos , Sinergismo Farmacológico , Humanos , Pruebas de Sensibilidad Microbiana , Mutación
5.
Nat Commun ; 11(1): 4379, 2020 09 01.
Artículo en Inglés | MEDLINE | ID: mdl-32873785

RESUMEN

The gut microbiome harbors a 'silent reservoir' of antibiotic resistance (AR) genes that is thought to contribute to the emergence of multidrug-resistant pathogens through horizontal gene transfer (HGT). To counteract the spread of AR, it is paramount to know which organisms harbor mobile AR genes and which organisms engage in HGT. Despite methods that characterize the overall abundance of AR genes in the gut, technological limitations of short-read sequencing have precluded linking bacterial taxa to specific mobile genetic elements (MGEs) encoding AR genes. Here, we apply Hi-C, a high-throughput, culture-independent method, to surveil the bacterial carriage of MGEs. We compare two healthy individuals with seven neutropenic patients undergoing hematopoietic stem cell transplantation, who receive multiple courses of antibiotics, and are acutely vulnerable to the threat of multidrug-resistant infections. We find distinct networks of HGT across individuals, though AR and mobile genes are associated with more diverse taxa within the neutropenic patients than the healthy subjects. Our data further suggest that HGT occurs frequently over a several-week period in both cohorts. Whereas most efforts to understand the spread of AR genes have focused on pathogenic species, our findings shed light on the role of the human gut microbiome in this process.


Asunto(s)
Antibacterianos/farmacología , Farmacorresistencia Bacteriana/genética , Microbioma Gastrointestinal/genética , Transferencia de Gen Horizontal , Genes Bacterianos/efectos de los fármacos , Adulto , Anciano , Antibacterianos/uso terapéutico , ADN Bacteriano/genética , ADN Bacteriano/aislamiento & purificación , Microbioma Gastrointestinal/efectos de los fármacos , Secuenciación de Nucleótidos de Alto Rendimiento , Humanos , Secuencias Repetitivas Esparcidas/efectos de los fármacos , Persona de Mediana Edad
6.
BMC Infect Dis ; 20(1): 657, 2020 Sep 07.
Artículo en Inglés | MEDLINE | ID: mdl-32894079

RESUMEN

BACKGROUND: Tuberculosis is still a significant diagnostic and therapeutic challenge with high proportion of smear- and culture- negative incidences worldwide. The conventional diagnostic tests are time-consuming and have a low sensitivity. Digital PCR is a novel technology which can detect target sequences with relatively low abundance and obtain the absolute copy numbers of the targets. METHODS: We assessed the accuracy of dPCR in TB diagnosis using more than 250 specimens, and for the first time, we selected M.tuberculosis-specific IS1081 in addition to widely used IS6110 as the amplification targets for dPCR. The quantification of target DNA was calculated using QuantaSoft Version 1.7.4.0917 (BioRad), and SPSS version 13.0 software (SPSS Inc., Chicago, IL, USA) was used for statistical analyses. RESULTS: IS6110-dPCR was more sensitive than IS1081, with the sensitivity and specificity accounting for 40.6 and 93.4% respectively. When we classified the TB patients by personal factors for high copy number of M.tuberculosis derived DNA in plasma: bilateral TB, extrapulmonary TB and disseminated TB, the sensitivity of both IS6110- and IS1081- dPCR was the highest in patients with disseminated TB (IS6110, 100%; IS1081, 68.8%), while their sensitivity was a bit higher in patients with extrapulmonary TB (IS6110, 50.0%; IS1081, 39.3%) than that in bilateral TB (IS6110, 43.3%; IS1081, 33.3%). Compared with traditional TB diagnostic tests, joint detection IS6110 & IS1081-dPCR was not as sensitive as smear microscope or mycobacterial culture, but it was higher than IS6110 qPCR (p < 0.05) and was able to detect 47.4% of smear-negative TB patients. CONCLUSION: Our study suggested that plasma IS6110-dPCR is a rapid, moderate accurate and less-invasive method to detect M.tuberculosis DNA in plasma of TB patients and IS6110 & IS1081-dPCR has a potential to aid diagnosis of smear-negative TB.


Asunto(s)
Elementos Transponibles de ADN/genética , ADN Bacteriano/genética , Mycobacterium tuberculosis/genética , Reacción en Cadena en Tiempo Real de la Polimerasa/métodos , Tuberculosis Pulmonar/diagnóstico , Adolescente , Adulto , Anciano , ADN Bacteriano/sangre , Exactitud de los Datos , Femenino , Humanos , Masculino , Persona de Mediana Edad , Sensibilidad y Especificidad , Adulto Joven
7.
Chemosphere ; 254: 126842, 2020 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-32957273

RESUMEN

Diffusion, sorption-desorption, and biodegradation influence chlorinated solvent storage in, and release (mass flux) from, low-permeability media. Although bioenhanced dissolution of non-aqueous phase liquids has been well-documented, less attention has been directed towards biologically-mediated enhanced diffusion from low-permeability media. This process was investigated using a heterogeneous aquifer cell, packed with 20-30 mesh Ottawa sand and lenses of varying permeability (1.0 × 10-12-1.2 × 10-11 m2) and organic carbon (OC) content (<0.1%-2%), underlain by trichloroethene (TCE)-saturated clay. Initial contaminant loading was attained by flushing with 0.5 mM TCE. Total chlorinated ethenes removal by hydraulic flushing was then compared for abiotic and bioaugmented systems (KB-1® SIREM; Guelph, ON). A numerical model incorporating coupled diffusion and (de)sorption facilitated quantification of bio-enhanced TCE release from low-permeability lenses, which ranged from 6% to 53%. Although Dehalococcoides mccartyi (Dhc) 16S rRNA genes were uniformly distributed throughout the porous media, strain-specific distribution, as indicated by the reductive dehalogenase (RDase) genes vcrA, bvcA, and tceA, was influenced by physical and chemical heterogeneity. Cells harboring the bvcA gene comprised 44% of the total RDase genes in the lower clay layer and media surrounding high OC lenses, but only 2% of RDase genes at other locations. Conversely, cells harboring the vcrA gene comprised 50% of RDase genes in low-permeability media compared with 85% at other locations. These results demonstrate the influence of microbial processes on back diffusion, which was most evident in regions with pronounced contrasts in permeability and OC content. Bioenhanced mass transfer and changes in the relative abundance of Dhc strains are likely to impact bioremediation performance in heterogeneous systems.


Asunto(s)
Chloroflexi/metabolismo , Contaminantes Químicos del Agua/aislamiento & purificación , Adsorción , Biodegradación Ambiental , ADN Bacteriano/genética , Difusión , Agua Subterránea , Dinámica Poblacional , Porosidad , ARN Ribosómico 16S/análisis , ARN Ribosómico 16S/genética , Tricloroetileno/aislamiento & purificación , Tricloroetileno/metabolismo , Contaminantes Químicos del Agua/metabolismo
8.
PLoS One ; 15(9): e0239146, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32976521

RESUMEN

The first objective of this study was to determine the GenoType NTM-DR assay performance for subspecies identification in Mycobacterium abscessus complex isolates. The second objective was to evaluate the GenoType NTM-DR assay ability to detect clarithromycin and amikacin resistance in M. abscessus complex isolates compared with drug susceptibility testing (DST) and PCR sequencing of the erm(41), rrl and rrs genes. The concordance between the GenoType NTM-DR and MLST results concerning subspecies identification was 100%. The wild type and mutated alleles of the rrl and rrs genes were detected by the GenoType NTM-DR assay and PCR sequencing with 100% (115/115) agreement. Similarly, 100% concordance between GenoType NTM-DR and DST was observed for clarithromycin and amikacin testing. Sensitivity for the detection of clarithromycin and amikacin resistance was 100%. The GenoType NTM-DR assay provides a robust and complementary tool to the gold standard methods (MLST and broth microdilution) for subspecies identification and drug resistance detection.


Asunto(s)
Antibacterianos/farmacología , Farmacorresistencia Bacteriana/genética , Técnicas de Genotipaje/instrumentación , Pruebas de Sensibilidad Microbiana/instrumentación , Mycobacterium abscessus/genética , Juego de Reactivos para Diagnóstico , Amicacina/farmacología , Amicacina/uso terapéutico , Antibacterianos/uso terapéutico , Claritromicina/farmacología , Claritromicina/uso terapéutico , Análisis Mutacional de ADN/instrumentación , ADN Bacteriano/genética , ADN Bacteriano/aislamiento & purificación , Genes Bacterianos/genética , Humanos , Tipificación de Secuencias Multilocus , Mutación , Infecciones por Mycobacterium no Tuberculosas/tratamiento farmacológico , Infecciones por Mycobacterium no Tuberculosas/microbiología , Mycobacterium abscessus/aislamiento & purificación , Reacción en Cadena de la Polimerasa
9.
Int J Syst Evol Microbiol ; 70(10): 5319-5329, 2020 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-32877324

RESUMEN

Phytopathogenic bacteria, MAFF 212426, MAFF 212427T, MAFF 212428 and MAFF 212429, were isolated from head rot lesions of broccoli (Brassica oleracea L. var. italica Plenck) in Hokkaido, Japan, and subjected to polyphasic taxonomic characterization. The cells were Gram-reaction-negative, aerobic, non-spore-forming, motile with one or two polar flagella, rod-shaped and formed pale yellow colonies. Results of 16S rRNA gene sequence analysis showed that they belong to the genus Pseudomonas with the highest similarity to 'Pseudomonas qingdaonensis' JJ3T (99.86 %), Pseudomonas laurentiana GSL-010T (99.22 %), Pseudomonas huaxiensis WCHPs060044T (99.01 %), Pseudomonas japonica NBRC 103040T (98.87 %) and Pseudomonas alkylphenolica KL28T (98.73 %). The genomic DNA G+C content was 63.4 mol% and the major fatty acids (>5 % of the total fatty acids) were summed feature 3 (C16 : 1 ω7c / C16 : 1 ω6c), C16 : 0, summed feature 8 (C18 : 1 ω7c / C18 : 1 ω6c) and C17 : 0 cyclo. Multilocus sequence analysis using the partial rpoD, gyrB and rpoB gene sequences and phylogenomic analyses based on the whole genome sequences demonstrated that the strains are members of the Pseudomonas putida group, but form a monophyletic, robust clade separated from their closest relatives. Average nucleotide identity (ANI) and digital DNA-DNA hybridization (dDDH) values corroborated their novel species status, with 88.39 % (ANI) and 35.8 % (dDDH) as the highest scores with 'P. qingdaonensis' JJ3T. The strains were differentiated from their closest relatives by phenotypic characteristics, pathogenicity on broccoli, and whole-cell MALDI-TOF mass spectrometry profiles. The phenotypic, chemotaxonomic and genotypic data showed that the strains represent a novel Pseudomonas species, for which the name Pseudomonas brassicae sp. nov. is proposed. The type strain is MAFF 212427T (=ICMP 23635T).


Asunto(s)
Brassica/microbiología , Filogenia , Enfermedades de las Plantas/microbiología , Pseudomonas/clasificación , Técnicas de Tipificación Bacteriana , Composición de Base , ADN Bacteriano/genética , Ácidos Grasos/química , Genes Bacterianos , Japón , Hibridación de Ácido Nucleico , Fosfolípidos/química , Pigmentación , Pseudomonas/aislamiento & purificación , ARN Ribosómico 16S/genética , Análisis de Secuencia de ADN
10.
Int J Syst Evol Microbiol ; 70(10): 5382-5388, 2020 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-32877325

RESUMEN

A novel fibrillar matrix-producing, rod-shaped, red-orange, asporogenous, aerobic bacterium, designated DK36T, was isolated from roots of a rice plant in the Ilsan region near Dongguk University, South Korea. Cells of strain DK36T were Gram-stain-negative and motile by means of gliding. The temperature and pH ranges for growth were 7-35 °C (optimum: 30 °C) and pH 5-10 (optimum: pH 7.0). The strain did not require NaCl for growth but tolerated up to 8 % (w/v) NaCl. Phylogenetic anlaysis of the 16S rRNA gene sequence revealed that DK36T formed a monophyletic clade with Adhaeribacter aerophilus 6425 S-25T, Adhaeribacter aerolatus 6515 J-31T and Adhaeribacter swui 17mud1-7T with sequence similarities of 96.3, 95.5 and 95.2%, respectively. The average nucleotide identity and in silico DNA-DNA hybridization values of strain DK36T with the most closely related strains whose whole genomes are publicly available were 72.5-83.6% and 19-28 %, respectively. The strain showed the typical chemotaxonomic characteristics of the genus Adhaeribacter, with the presence of menaquinone MK-7 as the respiratory quinone, and C16 : 1ω5c, iso-C15 : 0 and summed feature 4 (composed of iso-C17 : 1 I/anteiso-C17 : 1 B) as the major fatty acids. The polar lipid profile consisted of phosphatidylethanolamine, one unidentified aminophosphoglycolipid, one unidentified phospholipid, two unidentified aminolipids and five unidentified polar lipids. The genomic DNA G+C content based on the draft genome sequence was 43.4 mol%. The results of physiological and biochemical tests and 16S rRNA gene sequence analysis clearly revealed that strain DK36T represents a novel species of the genus Adhaeribacter, for which the name Adhaeribacter rhizoryzae sp. nov. is proposed. The type strain is DK36T (=KACC 19902T=NBRC 113689T).


Asunto(s)
Bacteroidetes/clasificación , Oryza/microbiología , Filogenia , Rizosfera , Microbiología del Suelo , Técnicas de Tipificación Bacteriana , Bacteroidetes/aislamiento & purificación , Composición de Base , ADN Bacteriano/genética , Ácidos Grasos/química , Hibridación de Ácido Nucleico , Fosfolípidos/química , Pigmentación , ARN Ribosómico 16S/genética , República de Corea , Análisis de Secuencia de ADN , Vitamina K 2/análogos & derivados , Vitamina K 2/química
11.
Int J Syst Evol Microbiol ; 70(10): 5304-5311, 2020 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-32877326

RESUMEN

Two Gram-stain-positive, facultatively anaerobic, motile, aerobic, rod-shaped and non-spore-forming actinobacteria, strains AO-9T and AO-18, were isolated from paddy soil collected from Daejeon, Republic of Korea. Colonies were smooth, lemon-yellow and circular and 0.5-0.8×2.0-2.4 µm in diameter after 3 days of incubation at 28 °C on tryptic soy agar. Phylogenetic analyses based on 16S rRNA gene sequences revealed that strains AO-9T and AO-18 belonged to the genus Cellulomonas, showing the highest sequence similarities to Cellulomonas marina FXJ8.089T (96.6 %), Cellulomonas endophytica SYSUP0004T (96.5 %), Cellulomonas gelida DSM 20111T (96.2 %), Cellulomonas uda DSM 20107T (96.1 %), Cellulomonas rhizosphaerae NEAU-TCZ24T (96.1 %), Cellulomonas composti TR7-06T (96.0 %), Cellulomonas persica JCM 18111T (96.0 %) and less than 96 % to other closely related species. The DNA-DNA hybridization values between strains AO-9T and AO-18 were 87 %. The average nucleotide identity and digital DNA-DNA hybridization values between strain AO-9T and type strains of related species of the genus Cellulomonas were 84.0-85.8 % and 20.3-20.9 %, respectively. The major cellular fatty acids are anteiso-C15:0 (49.9 %), C14:0 (12.9 %) and iso-C14:0 (12.1 %). The predominant isoprenoid quinone was MK-9 (H4). The polar lipid profile consists of diphosphatidylglycerol, phosphatidylglycerol and one unidentified lipid. The DNA G+C content was 72.9 mol%. Based on its distinctive phenotypic, phylogenetic and chemotaxonomic characteristics, the two strains are considered to represent novel species of the genus Cellulomonas, for which the name Cellulomonas citrea sp. nov. is proposed. The type strain is AO-9T (=KACC 19069T=NBRC 112523T).


Asunto(s)
Cellulomonas/clasificación , Oryza , Filogenia , Microbiología del Suelo , Técnicas de Tipificación Bacteriana , Composición de Base , Cellulomonas/aislamiento & purificación , ADN Bacteriano/genética , Ácidos Grasos/química , Hibridación de Ácido Nucleico , Pigmentación , ARN Ribosómico 16S/genética , República de Corea , Análisis de Secuencia de ADN , Vitamina K 2/análogos & derivados , Vitamina K 2/química
12.
Int J Syst Evol Microbiol ; 70(10): 5355-5362, 2020 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-32881677

RESUMEN

Two novel strains (HMF3257T and HMF4905T), isolated from freshwater and bark samples, were investigated to determine their relationships within and between species of the genus Spirosoma by using a polyphasic approach. They were aerobic, Gram-stain-negative, non-motile and rod-shaped bacteria. The major fatty acids (>10%) in both strains were identified as summed feature 3 (C16 : 1 ω7c and/or C16 : 1 ω6c) and C16 : 1 ω5c, while strains HMF3257T and HMF4905T contained a moderately high amount of C16 : 0 and iso-C15 : 0, respectively. The predominant respiratory quinone was MK-7 for both strains. In addition to phosphatidylethanolamine and one unidentified glycolipid, the polar lipid profile of strain HMF3257T consisted of three unidentified aminophospholipids, one unidentified aminolipid and two unidentified polar lipids, and that of strain HMF4905T consisted of one unidentified aminophospholipid, two unidentified aminolipids and three unidentified polar lipids. The DNA G+C contents of strains HMF3257T and HMF4905T were 47.2 and 46.4 mol%, respectively. Phylogenetic analysis based on 16S rRNA gene sequences showed that strains HMF3257T and HMF4905T are closely related to Spirosoma migulaei 15J9-8T (97.0 % sequence similarity), while sharing 97.4 % sequence similarity with each other. The average nucleotide identity value between strains HMF3257T and HMF4905T was 81.1 %, and the digital DNA-DNA hybridization value between these two strains was 24.4 %. Based on the above data, strains HMF3257T and HMF4905T represent two novel members within the genus Spirosoma, for which the names Spirosoma telluris sp. nov. and Spirosoma arboris sp. nov. are proposed, respectively. The type strain of S. telluris is HMF3257T (=KCTC 62463T=NBRC 112670T) and type strain of S. arboris is HMF4905T (=KCTC 72779T=NBRC 114270T).


Asunto(s)
Cytophagaceae/clasificación , Filogenia , Corteza de la Planta/microbiología , Microbiología del Suelo , Técnicas de Tipificación Bacteriana , Composición de Base , Cytophagaceae/aislamiento & purificación , ADN Bacteriano/genética , Ácidos Grasos/química , Hibridación de Ácido Nucleico , Fosfolípidos/química , Pinales/microbiología , ARN Ribosómico 16S/genética , República de Corea , Análisis de Secuencia de ADN , Árboles/microbiología , Vitamina K 2/análogos & derivados , Vitamina K 2/química
13.
Int J Syst Evol Microbiol ; 70(10): 5280-5286, 2020 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-32881678

RESUMEN

A Gram-stain-positive, rod-shaped, whitesmoke-coloured and aerobic bacterium, designated strain Co35T, was isolated from the intestine of Collichthys lucidus collected from the Jiangmen Guangdong Chinese White Dolphin Provincial Nature Reserve. Strain Co35T was able to grow at 15-35 °C (optimal 28 °C), at pH 7.0-8.5 (optimal 8.0) and with 0-9 % (w/v) NaCl (optimal 0.5-1 %). Phylogenetic analysis based on 16S rRNA gene sequences revealed that strain Co35T was a member of the genus Aeromicrobium within the family Nocardioidaceae. The genomic DNA G+C content of strain Co35T was 68.4 mol%. Chemotaxonomic analysis showed that the sole respiratory quinone was menaquinone 9 (MK-9), and the major fatty acids included 10-methyl C18 : 0. The polar lipids were found to consist of phosphatidylglycerol (PG), diphosphatidylglycerol (DPG), phosphatidylethanolamine (PE), phosphatidylinositol (PI), two unidentified phospholipids (PL1-2) and two unidentified glycolipids (GL1-2). On the basis of its phylogenetic, phenotypic, chemotaxonomic, genotypic and genomic characteristics presented in this study, strain Co35T represents a novel species in the genus Aeromicrobium, for which the name Aeromicrobium piscarium sp. nov. is proposed. The type strain is Co35T (=KCTC 49280T=MCCC 1K03754T).


Asunto(s)
Actinobacteria/clasificación , Perciformes/microbiología , Filogenia , Actinobacteria/aislamiento & purificación , Animales , Técnicas de Tipificación Bacteriana , Composición de Base , China , ADN Bacteriano/genética , Ácidos Grasos/química , Glucolípidos/química , Intestinos/microbiología , Fosfolípidos/química , ARN Ribosómico 16S/genética , Análisis de Secuencia de ADN , Vitamina K 2/análogos & derivados , Vitamina K 2/química
14.
Int J Syst Evol Microbiol ; 70(10): 5473-5478, 2020 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-32886590

RESUMEN

A Gram-stain-negative, non-motile, coccus-shaped, catalase- and oxidase-positive, facultatively anaerobic and pink-pigmented bacterium, designated strain CQN31T, was isolated from sediment of Changqiaohai Lake, Yunnan Province, China. Growth occurred at 4-45 °C (optimum, 37 °C), at pH 6.5-9.5 (optimum, pH 8.0) and with 0-1 % (w/v) NaCl (optimum, 0 %). C18 : 1 ω7c/C18 : 1 ω6c and C16 : 0 were the predominant fatty acids. Phosphatidylcholine (PC), phosphatidylethanolamine (PE), phosphatidylglycerol (PG), diphosphatidylglycerol (DPG), phosphatidyldimethylethanolamine (PME) and one unidentified aminolipid (AL) were the major polar lipids. The G+C content of the genomic DNA was 71.5 %. 16S rRNA gene sequence comparisons indicated that strain CQN31T shared 96.8 % similarity with Roseomonas wooponensis JCM 19527T and 95.9 % with R. terricola EM0302T. Digital DNA-DNA hybridization values between strain CQN31T and Roseomonas stagni DSM 19981T, R. rosea DSM 14916T and R. mucosa NCTC 13291T were 21.0, 19.4 and 19.8 %, respectively. Average amino acid identity and average nucleotide identity values between strain CQN31T and R. stagni DSM 19981T, R. rosea DSM 14916T and R. mucosa NCTC 13291T were 73.7, 63.4 and 61.9 %, and 79.2, 77.1 and 77.5%, respectively. Distinct morphological, physiological and genotypic differences from previously described taxa support the classification of strain CQN31T as a representative of a novel species in the genus Roseomonas, for which the name Roseomonas bella sp. nov. is proposed. The type strain is CQN31T (=KCTC 62447T=MCCC 1H00309T).


Asunto(s)
Sedimentos Geológicos/microbiología , Lagos/microbiología , Methylobacteriaceae/clasificación , Filogenia , Técnicas de Tipificación Bacteriana , Composición de Base , China , ADN Bacteriano/genética , Ácidos Grasos/química , Methylobacteriaceae/aislamiento & purificación , Hibridación de Ácido Nucleico , Fosfolípidos/química , Pigmentación , ARN Ribosómico 16S/genética , Análisis de Secuencia de ADN
15.
Int J Syst Evol Microbiol ; 70(10): 5417-5424, 2020 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-32886591

RESUMEN

A Gram-stain-negative, moderately halophilic strain, designated strain L5T, was isolated from wetsalted hides collected from Chengdu, south-west PR China. The cells were motile, facultative aerobic, short rod-shaped and non-endospore-forming. Growth of strain L5T occurred at pH 6-10 (optimum, pH 8), 10-45 °C (optimum, 30 °C) and in the presence of 1-17 % (w/v) NaCl (optimum, 10 %). Results of phylogenetic analyses based on 16S rRNA, gyrB and rpoD gene sequences and its genome revealed that strain L5T belonged to the genus Halomonas. Strain L5T was found to be most closely related to the type strains of Halomonas saliphila, Halomonas lactosivorans, Halomonas kenyensis, Halomonas daqingensis and Halomonas desiderata (98.8, 98.6, 98.3, 97.9 and 97.4 % 16S rRNA gene sequence similarity, respectively). The draft genome was approximately 4.2 Mb in size with a G+C content of 63.5 mol%. The average nucleotide identity (ANI) and digital DNA-DNA hybridization values among strain L5T and the selected Halomonas species were 83.3-88.9 % (ANIm), 71.1-87.3 % (ANIb) and 20.2-34.6 %, which are below the recommended cutoff values. Major fatty acids were C16 : 0, C16 : 1 ω7c, C18 : 1 ω7c and C19 : 0 cyclo ω8c and the predominant ubiquinone was Q-9, with minor ubiquinone Q-8 also present. The phospholipid profile consisted of diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine, phosphatidylcholine, four unidentified aminophospholipids and three unidentified phospholipids. Based on the mentioned polyphasic taxonomic evidence, strain L5T represents a novel species within the genus Halomonas, for which Halomonas pellis sp. nov. is proposed. The type strain is L5T (=CGMCC 1.17335T=KCTC 72573T).


Asunto(s)
Cabras/microbiología , Halomonas/clasificación , Filogenia , Piel/microbiología , Animales , Técnicas de Tipificación Bacteriana , Composición de Base , China , ADN Bacteriano/genética , Ácidos Grasos/química , Genes Bacterianos , Halomonas/aislamiento & purificación , Hibridación de Ácido Nucleico , Fosfolípidos/química , ARN Ribosómico 16S/genética , Análisis de Secuencia de ADN , Cloruro de Sodio , Ubiquinona/química
16.
Int J Syst Evol Microbiol ; 70(10): 5488-5496, 2020 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-32886593

RESUMEN

A novel Gram-stain-negative, non-motile, strictly aerobic, rod-shaped bacterium was isolated from deep-sea hydrothermal sulfide in the northwest Indian Ocean Ridge and designated as strain IOP_32T. Strain IOP_32T could grow at 4-40 °C (optimum, 37 °C), pH 5-9 (optimum, pH 7-8) and salinity of 0-12 % NaCl (w/v; optimum, 2-3 %). The 16S rRNA gene sequence of strain IOP_32T is most similar to Bizionia fulviae EM7T, Bizionia berychis RA3-3-1T, Bizionia paragorgiae KMM 6029T and Oceanihabitans sediminis S9_10T with 95.5-95.3 % similarity. The phylogenomic analysis indicated that strain IOP_32T forms a distinct lineage with Flaviramulus ichthyoenteri Th78T within the family Flavobacteriaceae. The average nucleotide identity, average amino acid identity and percentage of conserved protein values between strain IOP_32T and the type strains of close genera were 72.3-78.5 %, 67.4-76.9 % and 56.3-61.6 %, respectively. The major cellular fatty acid was anteiso-C15 : 0. The respiratory quinone was MK-6. The polar lipids were mainly composed of phosphatidylethanolamine, an unidentified aminophospholipid and five unidentified polar lipids. Strain IOP_32T is significantly different from related genera, which is reflected by the wide adaptability to temperature and salinity levels, the composition of phospholipids and fatty acids, and the results of phylogenetic analyses. The phenotypic properties and phylogenetic data suggest that the lineage represents a novel genus and species within the family Flavobacteriaceae, for which the name Wocania indica gen. sp. nov. is proposed, with the type strain IOP_32T (=MCCC 1A14017 T=KCTC 62660 T). We also propose the reclassification of Flaviramulus ichthyoenteri as Wocania ichthyoenteri comb. nov. (Th78T=DSM 26285T=JCM 18634T=KCTC 32142T).


Asunto(s)
Flavobacteriaceae/clasificación , Respiraderos Hidrotermales/microbiología , Filogenia , Técnicas de Tipificación Bacteriana , Composición de Base , ADN Bacteriano/genética , Ácidos Grasos/química , Flavobacteriaceae/aislamiento & purificación , Océano Índico , Fosfolípidos/química , ARN Ribosómico 16S/genética , Análisis de Secuencia de ADN , Vitamina K 2/análogos & derivados , Vitamina K 2/química
17.
Int J Syst Evol Microbiol ; 70(10): 5425-5431, 2020 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-32886594

RESUMEN

An actinobacterial strain, designated KUDC0627T, was isolated from rhizospheric soil that contained Elymus tsukushiensis on the Dokdo Islands, Republic of Korea. Cells were Gram-stain-positive, facultative anaerobic, non-motile and non-endospore-forming cocci. Results of phylogenetic analysis based on 16S rRNA gene sequences indicated that strain KUDC0627T belongs to the genus Microlunatus and is most closely related to Microlunatus soli DSM 21800T (98.5 %), Microlunatus endophyticus DSM 100019T (97.7 %) and Microlunatus ginsengisoli Gsoil 633T (96.5 %). The average nucleotide identity scores and average amino acid identity values were all below the 95.0 % cut-off point. In silico DNA-DNA hybridization, using the Genome-to-Genome Distance Calculator, estimated that there is 22.3 % DNA relatedness between KUDC0627T and M. soli DSM 21800T. The genomic DNA G+C content was 66.9 mol%. The major menaquinone was MK-9(H4) and the major diagnostic diamino acid in the cell-wall peptidoglycan was ll-diaminopimelic acid. The polar lipid profile included diphosphatidylglycerol, phosphatidylglycerol, unidentified phospholipids, unidentified glycolipids and unidentified lipids. The major cellular fatty acids were iso-C15 : 0, anteiso-C15 : 0 and iso-C16 : 0. Based on phenotypic, chemotaxonomic, and phylogenetic data, strain KUDC0627T (=KCTC 39853T=JCM 32702T) represents a novel species, for which the name Microlunatus elymi sp. nov. is proposed.


Asunto(s)
Elymus/microbiología , Filogenia , Propionibacteriaceae/clasificación , Rizosfera , Microbiología del Suelo , Técnicas de Tipificación Bacteriana , Composición de Base , ADN Bacteriano/genética , Ácidos Grasos/química , Hibridación de Ácido Nucleico , Fosfolípidos/química , Propionibacteriaceae/aislamiento & purificación , ARN Ribosómico 16S/genética , República de Corea , Análisis de Secuencia de ADN , Vitamina K 2/análogos & derivados , Vitamina K 2/química
18.
Int J Syst Evol Microbiol ; 70(10): 5445-5452, 2020 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-32886595

RESUMEN

A Gram-stain-positive, aerobic, catalase-positive, oxidase-negative, non-mycelium-forming, motile, rod-shaped with one polar flagellum actinobacterium, designated E918T, was isolated from a desert soil collected in Cholistan desert, Pakistan. Phylogenetic analysis based on 16S rRNA gene sequences revealed that strain E918T belonged to the genus Arthrobacter and was most closely related to Arthrobacter deserti CGMCC 1.15091T (97.2 % similarity). The peptidoglycan was of the A3α type and the whole-cell sugar profile was found to contain galactose. The major menaquinone was MK-9(H2). The polar lipid profile consisted of diphosphatidylglycerol, phosphatidylglycerol, phosphatidylinositol and two unidentified glycolipids. The major fatty acids identified were anteiso-C15 : 0 and anteiso-C17 : 0. The G+C content of the genomic DNA was 68.69 mol%. The digital DNA-DNA hybridization and average nucleotide identity values between strain E918T and A. deserti CGMCC 1.15091T were 28.0 and 83.4%, respectively. On the basis of its phylogenetic, phenotypic and chemotaxonomic features, strain E918T was considered to represent a novel species of the genus Arthrobacter, for which the name Arthrobacter mobilis sp. nov. is proposed. The type strain of Arthrobacter mobilis is E918T (=JCM 33392T=CGMCC 1.16978T).


Asunto(s)
Arthrobacter/clasificación , Clima Desértico , Filogenia , Microbiología del Suelo , Arthrobacter/aislamiento & purificación , Técnicas de Tipificación Bacteriana , Composición de Base , ADN Bacteriano/genética , Ácidos Grasos/química , Glucolípidos/química , Hibridación de Ácido Nucleico , Pakistán , Peptidoglicano/química , Fosfolípidos/química , ARN Ribosómico 16S/genética , Análisis de Secuencia de ADN , Vitamina K 2/análogos & derivados , Vitamina K 2/química
19.
Int J Syst Evol Microbiol ; 70(10): 5373-5381, 2020 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-32886596

RESUMEN

A Gram-stain-negative, strictly aerobic, non-motile, rod-shaped bacterium, designated CWB-1T, was isolated from a haloalkaline lake sediment sample collected from the bottom of Chaiwopu Lake, Urumchi, Xinjiang Province, PR China. Strain CWB-1T grew at 4-40 °C (optimum, 30-35 °C), pH 6.5-9.0 (optimum, pH 6.5-7.0) and with 0.5-5.5 % (w/v) NaCl (optimum, 2.5-3.0 %). Phylogenetic analyses based on the 16S rRNA gene sequence and the whole genome sequence both revealed that strain CWB-1T belonged to the family Flavobacteriaceae. The strain had the highest similarity of the 16S rRNA gene sequence to Psychroserpens jangbogonensis PAMC 27130T (92.8 %). The genome of strain CWB-1T was 3 548 011 bp long with 36.3 % DNA G+C content. The predominant fatty acids (>10 %) in the CWB-1T cells were iso-C15 : 0, iso-C17 : 0 3-OH and summed feature 1 (iso-C15 : 1 H/C13 : 0 3-OH). The major respiratory quinone was menaquinone-6 and the major polar lipids were phosphatidylethanolamine, an unidentified aminolipid and two unidentified lipids. Based on the phylogenetic analyses, as well as the phenotypic characteristics, a novel genus and species of the family Flavobacteriaceae, Paucihalobacter ruber gen. nov., sp. nov., is proposed. The type strain is CWB-1T (=KCTC 72450T=CGMCC 1.17149T).


Asunto(s)
Flavobacteriaceae/clasificación , Sedimentos Geológicos/microbiología , Lagos/microbiología , Filogenia , Álcalis , Técnicas de Tipificación Bacteriana , Composición de Base , China , ADN Bacteriano/genética , Ácidos Grasos/química , Flavobacteriaceae/aislamiento & purificación , Concentración de Iones de Hidrógeno , Fosfolípidos/química , ARN Ribosómico 16S/genética , Análisis de Secuencia de ADN , Vitamina K 2/análogos & derivados , Vitamina K 2/química
20.
Int J Syst Evol Microbiol ; 70(10): 5479-5487, 2020 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-32886597

RESUMEN

Two novel bacteria, designated HYN0043T and HYN0046T, were isolated from a freshwater lake in Korea. 16S rRNA gene sequence phylogeny indicated that strain HYN0043T belongs to the genus Mucilaginibacter of the family Sphingobacteriaceae because it showed highest sequence similarity to Mucilaginibacter oryzae (98.2 %). The average nucleotide identity between strain HYN0043T and M. oryzae was 83.5 %, which is clearly below the suggested threshold for species demarcation. Strain HYN0046T was found to belong to the family Moraxellaceae and shared highest sequence similarity with Agitococcus lubricus (93.8 %). The average amino acid identity values between strain HYN0046T and representative type strains of closely related genera (Alkanindiges, Agitococcus and Acinetobacter) were 53.1-60.7 %, implying the novelty of the isolate at the genus level. Phenotypic characteristics (physiological, biochemical and chemotaxonomic) also supported the taxonomic novelty of the two isolates. Thus, we suggest the following names to accommodate strains HYN0043T and HYN0046T: Mucilaginibacter celer sp. nov. (type strain HYN0043T=KACC 19184T=NBRC 112738T) in the family Spingobacteriaceae and phylum Bacteroidetes and Aquirhabdus parva gen. nov., sp. nov. (type strain HYN0046T=KACC 19178T=NBRC 112739T) in the family Moraxellaceae and phylum Proteobacteria.


Asunto(s)
Bacteroidetes/clasificación , Lagos/microbiología , Moraxellaceae/clasificación , Filogenia , Técnicas de Tipificación Bacteriana , Bacteroidetes/aislamiento & purificación , Composición de Base , ADN Bacteriano/genética , Ácidos Grasos/química , Moraxellaceae/aislamiento & purificación , ARN Ribosómico 16S/genética , República de Corea , Análisis de Secuencia de ADN
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