RESUMEN
The genus Segeticoccus includes only one species with validly published name, Segeticoccus rhizosphaerae. The type strain Segeticoccus rhizosphaerae YJ01T was isolated from soil in Korea, while Ornithinicoccus soli XNB-1T was isolated from soil in China. Both strains share similar phenotypic and chemotaxonomic characteristics, including predominant menaquinone MK-8(H4) and major polar lipids diphosphatidylglycerol and phosphatidylglycerol. Whole genome sequences revealed a DNA G+C content of 70.1 mol% for both strains and 100% similarity in their 16S rRNA gene sequences. Phylogenetic analysis showed they form a distinct cluster separate from other genera. Genomic comparisons showed average nucleotide identity and digital DNA-DNA hybridization values of 99.16 and 94.2%, respectively, indicating they represent a single species. Based on this genomic evidence, Ornithinicoccus soli Jiang et al. 2020 is proposed to be a later heterotypic synonym of Segeticoccus rhizosphaerae Lee and Whang 2020.
Asunto(s)
Técnicas de Tipificación Bacteriana , Composición de Base , ADN Bacteriano , Hibridación de Ácido Nucleico , Filogenia , ARN Ribosómico 16S , Análisis de Secuencia de ADN , Microbiología del Suelo , ARN Ribosómico 16S/genética , ADN Bacteriano/genética , China , República de Corea , Genoma Bacteriano , Ácidos Grasos , Secuenciación Completa del Genoma , Vitamina K 2/análogos & derivadosRESUMEN
A Gram-stain-positive, rod-shaped bacterium, designated as HLT2-17T, was isolated from soil sample taken from the Hailuogou glacier in Sichuan province, PR China. Strain HLT2-17T was capable of growing at 4-25°C and in NaCl concentrations ranging from 0 to 2% (w/v). The highest level of 16S rRNA gene sequence similarity was observed with Pengzhenrongella phosphoraccumulans M0-14T (98.3â%) and Pengzhenrongella sicca LRZ-2T (98.2â%). The average nucleotide identity and digital DNA-DNA hybridization values between strain HLT2-17T and its closest relatives, P. phosphoraccumulans M0-14T and P. sicca LRZ-2T, were 80.0-84.0â% and 23.3-27.7â%, respectively. Phylogenomic analysis indicated that strain HLT2-17T clustered together with strains P. phosphoraccumulans M0-14T and P. sicca LRZ-2T. Strain HLT2-17T contained C16â:â0 and anteiso-C15â:â0 as the major fatty acids, and MK-9(H4) as the menaquinone. Therefore, based on a polyphasic approach, we propose that strain HLT2-17T (=CGMCC 1.11116T= NBRC 110443T) represents a novel species of the genus Pengzhenrongella and suggest the name Pengzhenrongella frigida sp. nov.
Asunto(s)
Técnicas de Tipificación Bacteriana , Composición de Base , ADN Bacteriano , Ácidos Grasos , Cubierta de Hielo , Hibridación de Ácido Nucleico , Filogenia , ARN Ribosómico 16S , Análisis de Secuencia de ADN , Microbiología del Suelo , Vitamina K 2 , ARN Ribosómico 16S/genética , China , Ácidos Grasos/química , ADN Bacteriano/genética , Vitamina K 2/análogos & derivados , Vitamina K 2/química , Vitamina K 2/análisis , Cubierta de Hielo/microbiologíaRESUMEN
Six psychrotolerant, Gram-stain-negative, aerobic bacterial strains, designated as LB1P51T, LB2P87T, LB2P84, LB3P48, LB3R18 and XS2P67, were isolated from glaciers on the Tibetan Plateau, PR China. The results of 16S rRNA gene analysis confirmed their classification within the genus Flavobacterium. Strain LB2P87T displayed the highest sequence similarity to Flavobacterium sinopsychrotolerans 0533T (98.18â%), while strain LB1P51T exhibited the highest sequence similarity to Flavobacterium glaciei CGMCC 1.5380T (98.15â%). Strains LB2P87T and LB1P51T had genome sizes of 3.8 and 3.9 Mb, respectively, with DNA G+C contents of 34.2 and 34.1â%, respectively. Pairwise average nucleotide identity (ANI) and digital DNA-DNA hybridization (dDDH) calculations revealed that these strains represented two distinct species within the genus Flavobacterium. The results of phylogenomic analysis using 606 core genes indicated that the six strains formed a distinct clade and were most closely related to F. glaciei CGMCC 1.5380T. The ANI and dDDH values between the two species and other members of the genus Flavobacterium were below 90.3 and 40.1â%, respectively. Genome relatedness, the results of phylogenomic analysis and phenotypic characteristics collectively support the proposal of two novel species of the genus Flavobacterium: Flavobacterium algoritolerans sp. nov. (LB1P51T = CGMCC 1.11237T = NBRC 114813T) and Flavobacterium yafengii sp. nov. (LB2P87T = CGMCC 1.11249T = NBRC 114814T).
Asunto(s)
Ácidos Grasos , Flavobacterium , Flavobacterium/genética , ARN Ribosómico 16S/genética , Composición de Base , Filogenia , Análisis de Secuencia de ADN , ADN Bacteriano/genética , Técnicas de Tipificación Bacteriana , Ácidos Grasos/química , NucleótidosRESUMEN
The genus Flavobacterium belongs to the family Flavobacteriaceae and its members are widely distributed in the environment. Taxonomic descriptions of strains LS1R47T and LS1R49T isolated from the Laigu glacier on the Tibetan Plateau, China, are presented in this study. Both strains were psychrotolerant, Gram-stain-negative, aerobic and rod-shaped. The comparative analysis of 16S rRNA gene sequences showed that strain LS1R47T was closest to Flavobacterium bizetiae CIP 105534T (98.90â%) and strain LS1R49T was closest to Flavobacterium collinsii 983-08T (98.73â%). The 16S rRNA gene sequence similarity, average nucleotide identity (ANI) and digital DNA-DNA hybridization (dDDH) values between the two novel isolates were 99.4, 86.0 and 30.9â%, respectively. The ANI and dDDH values between strains LS1R47T and LS1R49T and their closely relatives were below 87.6 and 33.3â%, respectively. Phylogenomic analysis showed that the two strains cluster together with Flavobacterium hydatis ATCC 29551T. Both strains contained MK-6 as sole quinone, phosphatidylethanolamine as the principal polar lipid, and summed feature 3 (iso-C15â:â0 2-OH and/or C16â:â1 ω7c), iso-C15â:â0 3-OH, C15â:â0 3-OH and iso-C17â:â0 3-OH as the main fatty acids. These results indicated that strains LS1R47T and LS1R49T represented two novel species within the genus Flavobacterium. Therefore, we propose two novel species, Flavobacterium frigoritolerans sp. nov. (LS1R47T=CGMCC 1.11577T=NBRC 113654T) and Flavobacterium shii sp. nov. (LS1R49T=CGMCC 1.11581T=NBRC 113652T).
Asunto(s)
Ácidos Grasos , Cubierta de Hielo , Ácidos Grasos/química , Cubierta de Hielo/microbiología , Tibet , Flavobacterium , ARN Ribosómico 16S/genética , Filogenia , ADN Bacteriano/genética , Análisis de Secuencia de ADN , Técnicas de Tipificación Bacteriana , Composición de Base , Vitamina K 2RESUMEN
Strain R10T was isolated from a gravel soil sample obtained from Deception Island, Antarctica. The isolate was a Gram-stain-negative, strictly aerobic, motile, short-rod-shaped bacterium, and its colonies were orange yellow in colour. Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain R10T belonged to the family Aurantimonadaceae and shared highest sequence similarity with Jiella aquimaris LZB041T (96.3â% sequence similarity), Aurantimonas aggregata R14M6T (96.0â%) and Aureimonas frigidaquae JCM 14755T (96.0â%). Phylogenetic analysis showed that strain R10T affiliated with members of the family Aurantimonadaceae and represented an independent lineage. Growth occurred at 10-37 °C (optimum, 28-32 °C), up to 1.0 % (w/v) NaCl (optimum, 0â%) and pH 5.5-9.0 (optimum, pH 7.0). The major respiratory quinone of strain R10T was Q-10. Its major fatty acids were C18â:â1 ω7c and C16 : 0. The polar lipid profile of strain R10T comprised diphosphatidylglycerol, phosphatidylmonomethylethanolamine, phosphatidylethanolamine, phosphatidylglycerol, two unknown phospholipids and two unknown aminophospholipids. The genome of strain R10T was 5.92 Mbp with a G+C content of 69.1â% based on total genome calculations. Average nucleotide identity (ANI) values between R10T and other related species of the family Aurantimonadaceae were found to be low (ANIm <87.0â%, ANIb <75.0â% and OrthoANIu <77.0â%). Furthermore, digital DNA-DNA hybridization (dDDH) and average amino acid identity (AAI) values between strain R10T and the closely related species ranged from 19.5-20.6% and from 60.6-64.0â%, respectively. Based on the results of our phylogenetic, phenotypic, genotypic and chemotaxonomic analyses, it is concluded that strain R10T represents a novel genus and species of the family Aurantimonadaceae, for which the name Antarcticirhabdus aurantiaca gen. nov., sp. nov. is proposed. The type strain is R10T (=KCTC 72466T=CGMCC 1.17155T).
Asunto(s)
Ácidos Grasos , Ubiquinona , Ácidos Grasos/química , Regiones Antárticas , Filogenia , ARN Ribosómico 16S/genética , Ubiquinona/química , Composición de Base , Técnicas de Tipificación Bacteriana , ADN Bacteriano/genética , Análisis de Secuencia de ADN , Fosfolípidos/químicaRESUMEN
Strains RB4R14T and RT5R15T, two Gram-stain-negative, aerobic, rod-shaped, non-motile bacteria, were isolated from ice and cryoconite of Renlongba glacier, respectively, on the Tibetan Plateau, PR China. The results of phylogenetic analysis based on 16S rRNA genes indicated that strains RB4R14T and RT5R15T belonged to the genus Mucilaginibacter with the highest similarities to Mucilaginibacter rigui WPCB133T (98.78â%) and Mucilaginibacter xinganensis BJC16-A31T (97.64â%), respectively. The genomic DNA G+C contents of strains RB4R14T and RT5R15T were 42.8 and 43.1âmol%, respectively. The digital DNA-DNA hybridization values between strains RB4R14T, RT5R15T and their close relatives were below 31.9 and 17.4â%, respectively. The average nucleotide identity values between the two novel strains and their close relatives were 79.5-82.0 and 77.9-79.3â% respectively, indicating the novelty of the two isolates at a species level. The two novel strains contained MK-7 as the major menaquinone, and summed feature 3 (comprising C16â:â1 ω7c and/or C16â:â1 ω6c), iso-C15â:â0 and iso-C17â:â0-3OH as the major fatty acids. The major polar lipid of the two novel strains were phosphatidylethanolamine. Based on phenotypic, chemotaxonomic and phylogenetic results, we propose two novel species, Mucilaginibacter aurantiaciroseus sp. nov. (RB4R14T=CGMCC 1.11911T=NBRC 114020T) and Mucilaginibacter flavidus sp. nov. (RT5R15T=CGMCC 1.23117T=NBRC 113930T).
Asunto(s)
Ácidos Grasos , Cubierta de Hielo , Ácidos Grasos/química , Cubierta de Hielo/microbiología , Tibet , Filogenia , ARN Ribosómico 16S/genética , Técnicas de Tipificación Bacteriana , ADN Bacteriano/genética , Composición de Base , Análisis de Secuencia de ADN , Vitamina K 2RESUMEN
Strain 3F2T was isolated from a soil sample obtained from the surface of Deception Island, Antarctica. The isolate was a Gram-stain-negative, aerobic, non-motile, rod-shaped bacterium, and its colonies were red to pink in colour. Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain 3F2T belonged to the genus Hymenobacter, family Hymenobacteraceae and was most closely related to Hymenobacter sedentarius DG5BT (97.0% sequence similarity), Hymenobacter soli PB17T (96.9%), Hymenobacter terrae DG7AT (96.8%) and Hymenobacter rufus S1-2-2-6T (96.5%). Growth occurred at 4-20 °C (optimum, 10 °C), up to 1.0 % (w/v) NaCl (optimum, 0%) and pH 6.0-8.0 (optimum, pH 7.0). The chemotaxonomic characteristics of strain 3F2T, which had MK-7 as its predominant menaquinone and summed feature 3 (C16:1 ω7c and/or C16:1 ω6c), iso-C15:0, anteiso-C15:0 and C16:1 ω5c as its major fatty acids, were consistent with classification in the genus Hymenobacter. The polar lipid profile of strain 3F2T comprised phosphatidylethanolamine, two unidentified aminolipids, two unidentified aminophospholipids and three unidentified polar lipids. The genome of strain 3F2T was 6.56 Mbp with a G+C content of 61.5 mol%. Average nucleotide identity (ANI) values between 3F2T and the other species of the genus Hymenobacter were found to be low (ANIm <87.0%, ANIb <82.0% and OrthoANIu <83.0%). Furthermore, digital DNA-DNA hybridization and average amino acid identity values between strain 3F2T and the closely related species ranged from 20.0 to 26.3% and from 64.0 to 81.1 %, respectively. Based on the results of our phylogenetic, phenotypic, genotypic and chemotaxonomic analyses, it is concluded that strain 3F2T represents a novel species within the genus Hymenobacter, for which the name Hymenobacter terricola sp. nov. is proposed. The type strain is 3F2T (=KCTC 72468T=CGMCC 1.13716T).
Asunto(s)
Cytophagaceae , Filogenia , Microbiología del Suelo , Regiones Antárticas , Técnicas de Tipificación Bacteriana , Composición de Base , Cytophagaceae/clasificación , Cytophagaceae/aislamiento & purificación , ADN Bacteriano/genética , Ácidos Grasos/química , ARN Ribosómico 16S/genética , Análisis de Secuencia de ADNRESUMEN
The genus Flavobacterium (family Flavobacteriaceae) can be found in diverse environments. In this study, seven novel strains were isolated from glaciers in PR China and subjected to taxonomic research. Phylogenetic analyses based on the 16S rRNA gene revealed that the strains belonged to the genus Flavobacterium. None of the seven strains grew at temperatures above 22 °C, indicating that they are psychrophilic. Furthermore, the average nucleotide identity (ANI) values of the seven strains were calculated and indicated that they represented two novel species in Flavobacterium. Strain LB3P56T was most closely related to Flavobacterium soyangense IMCC26223T (97.70â%) and strain GSP16T was most closely related to Flavobacterium sinopsychrotolerans 0533T (98.03â%). The ANI values between the two Flavobacterium strains and their closest relatives were less than 83.47â%, which was much lower than the threshold for species delineation of 95-96â%. Therefore, we propose two novel species, Flavobacterium franklandianum sp. nov. (LB3P56T=CGMCC 1.11934T=NBRC 113651T) and Flavobacterium gawalongense sp. nov. (GSP16T=CGMCC 1.24642T=NBRC 113664T).
Asunto(s)
Flavobacterium/clasificación , Cubierta de Hielo/microbiología , Filogenia , Técnicas de Tipificación Bacteriana , Composición de Base , ADN Bacteriano/genética , Ácidos Grasos/química , Flavobacterium/aislamiento & purificación , ARN Ribosómico 16S/genética , Análisis de Secuencia de ADN , TibetRESUMEN
Two Gram-stain-positive, aerobic, rod-shaped, pink and light pink colony-forming bacteria, designated as Hz2T and MDT2-14T, respectively, were isolated from glacier cryoconite samples. Comparisons based on 16S rRNA gene sequences showed that strains Hz2T and MDT2-14T take Arthrobacter bussei KR32T and Arthrobacter zhaoguopingii J391T as their closest neighbours, respectively. The average nucleotide identity values between the two novel strains and their closest relatives were 83.56 and 93.06â%, respectively. The two strains contain MK-9(H2) as their predominant menaquinone. The polar lipids of both strains were phosphatidylglycerol, diphosphatidylglycerol, phosphatidylinositol and an unidentified glycolipid. The major fatty acids of strain Hz2T were anteiso-C15â:â0, summed feature 3 (comprising C16â:â1 ω7c and/or C16â:â1 ω6c) and iso-C15â:â0, while the major fatty acids of strain MDT2-14T were anteiso-C15â:â0 and anteiso-C17â:â0. Based on these data, we propose two novel species, Arthrobacter cheniae sp. nov. (Hz2T = CGMCC 1.9262T=NBRC 113086T) and Arthrobacter frigidicola sp. nov. (MDT2-14T=CGMCC 1.9882T=NBRC 113089T).
Asunto(s)
Arthrobacter , Cubierta de Hielo/microbiología , Filogenia , Arthrobacter/clasificación , Arthrobacter/aislamiento & purificación , Técnicas de Tipificación Bacteriana , Composición de Base , ADN Bacteriano/genética , Ácidos Grasos/química , Fosfolípidos/química , Pigmentación , ARN Ribosómico 16S/genética , Análisis de Secuencia de ADN , Vitamina K 2/análogos & derivados , Vitamina K 2/químicaRESUMEN
A novel Gram-stain-negative, rod-shaped, yellow bacterium, designated as LB1R16T, was isolated from the Laigu glacier on the Tibetan Plateau, PR China. Strain LB1R16T was catalase-positive, oxidase-negative and grew at 0-28 °C, pH 6.0-8.0 and in the absence of NaCl. Phylogenetic analysis based on 16S rRNA gene sequences revealed that strain LB1R16T belongs to the family Sphingosinicellaceae but formed an independent lineage. The highest level of 16S rRNA gene sequence similarities were found to Polymorphobacter arshaanensis DJ1R-1T (95.24â%), Sphingoaurantiacus capsulatus YLT33T (94.78â%) and Sandarakinorhabdus limnophila DSM 17366T (94.67â%). The genomic DNA G+C content was 68.8 mol%. The main cellular fatty acids were summed feature 8 (C18â:â1 ω7c/C18â:â1 ω6c), summed feature 3 (C16â:â1 ω7c/C16â:â1 ω6c), C16â:â0 and C12â:â0-OH. The respiratory quinone was ubiquinone-10. The polar lipids were phosphatidylethanolamine, phosphatidylglycerol, one sphingoglycolipid, one unidentified aminolipid, one unidentified phospholipid and two unidentified polar lipids, which were different from the type strains of Polymorphobacter arshaanensis, Sphingoaurantiacus capsulatus and Sandarakinorhabdus limnophila. Based on a polyphasic approach, a novel species of a new genus, Glacieibacterium frigidum gen. nov., sp. nov., within the family Sphingosinicellaceae is proposed. The type strain is LB1R16T (=CGMCC 1.11941T=NBRC 113873T).
Asunto(s)
Alphaproteobacteria/clasificación , Cubierta de Hielo/microbiología , Filogenia , Alphaproteobacteria/aislamiento & purificación , Técnicas de Tipificación Bacteriana , Composición de Base , China , ADN Bacteriano/genética , Ácidos Grasos/química , Fosfolípidos/química , ARN Ribosómico 16S/genética , Análisis de Secuencia de ADN , Ubiquinona/análogos & derivados , Ubiquinona/químicaRESUMEN
Two Gram-stain-negative, aerobic, rod-shaped, non-motile, bacterial strains, designated as ZB1P21T and ZT4R22T, were isolated from ice and cryoconite samples collected from Zepu glacier on the Tibetan Plateau, PR China. The phylogenetic analysis of 16S rRNA gene showed that the two strains belong to the genus Mucilaginibacter. Strain ZB1P21T showed the highest similarity to Mucilaginibacter rigui WPCB133T (97.35â%), while strain ZT4R22T showed the highest similarity to Mucilaginibacter gilvus F01003T (99.11â%). The average nucleotide identity values between the two novel strains and their closest relatives were 79.42 and 85.72â% respectively. The two novel strains contained MK-7 as the major menaquinone, and summed feature 3 (comprising C16â:â1 ω7c and/or C16â:â1 ω6c), iso-C15:0, iso-C17â:â03-OH and C16â:â1 ω5c as the major fatty acids. The major polar lipid of the two novel strains were phosphatidylethanolamine. Based on these data, we propose two novel species, Mucilaginibacter glaciei sp. nov. (ZB1P21T=CGMCC 1.23981T=NBRC 113932T) and Mucilaginibacter pankratovii sp. nov. (ZT4R22T=CGMCC 1.23487T=NBRC 113931T).
Asunto(s)
Bacteroidetes/clasificación , Cubierta de Hielo/microbiología , Filogenia , Técnicas de Tipificación Bacteriana , Bacteroidetes/aislamiento & purificación , Composición de Base , China , ADN Bacteriano/genética , Ácidos Grasos/química , Fosfatidiletanolaminas/química , ARN Ribosómico 16S/genética , Análisis de Secuencia de ADN , Tibet , Vitamina K 2/análogos & derivados , Vitamina K 2/químicaRESUMEN
A novel bacterial strain, designated C23T, was isolated from a soil sample obtained from King George Island, Antarctica. Phenotypic, phylogenetic, chemotaxonomic and molecular analyses were performed on the new isolate. Strain C23T formed orange colonies on agar plates and was Gram-stain-positive. Phylogenetic analyses based on 16S rRNA gene sequences showed that strain C23T was a member of the genus Planococcus and was closely related to Planococcus salinarum DSM 23802T (98.5% sequence similarity), Planococcus halotolerans SCU63T (98.3%), Planomicrobium okeanokoites IFO 12526T (98.3%), Planococcus donghaensis DSM 22276T (98.3%) and Planococcus maitriensisi S1T (98.2%). This organism grew at 2-38 °C (optimum, 25-30 °C), pH 6.0-12.0 (optimum, pH 7.5) and 0-14% (w/v) NaCl (optimum, 2%). The predominant menaquinone was MK-8. The major cellular fatty acids were anteiso-C15:0, iso-C14:0 and C16:1 ω7c alcohol. The whole genome DNA of C23T was deposited in the GenBank database under accession number WXYN00000000. According to the whole genome, the DNA G + C content of strain C23T was determined to be 46.8 mol%; the average nucleotide identity (ANI) of strain C23T and P. salinarum DSM 23802T, P. halotolerans SCU63T, P. okeanokoites IFO 12526T, P. donghaensis DSM 22276T and P. maitriensis S1T were 74.1%, 74.3%, 74.1%, 78.8 and 73.6%; the digital DNA-DNA hybridization (dDDH) values between strain C23T and the five closely related species were 19.7%, 19.6%, 19.5%, 22.4 and 18.6%; the average amino acid identity (AAI) values between strain C23T and the five closely related species were 73.9%, 74.5%, 74.4%, 84.6 and 74.5%. All data were below the threshold range for species determination. Based on the polyphasic taxonomic study, we considered that strain C23T represented a novel species of the genus Planococcus for which the name Planococcus soli sp. nov. is proposed. The type strain is C23T (= KCTC 33644T = CGMCC 1.15115T).
Asunto(s)
Microbiología del Suelo , Suelo , Regiones Antárticas , Técnicas de Tipificación Bacteriana , Composición de Base , ADN Bacteriano/genética , Ácidos Grasos/análisis , Filogenia , Planococcaceae , ARN Ribosómico 16S/genética , Análisis de Secuencia de ADNRESUMEN
The link between guanine-cytosine (GC) content and thermal adaptation is controversial. Here, we compared maximum growth temperature (TMGT ) and genomics of 78 Cryobacterium strains to avoid unreliable conclusions resulting from distantly phylogenetic groups. Phylogenomic analysis revealed this taxon had much higher diversification than we knew. Interestingly, these strains showed thermotolerance divergence with phylogenetic cohesion. A significant difference was found between TMGT ≤ 20°C strains and TMGT > 20°C strains in genomic GC content which mainly caused by variation of GC3. TMGT ≤ 20°C strains tended to use synonymous codons ended with A/U, but TMGT > 20°C strains tended to use G/C. Lower GC content at synonymous sites (≈GC3) of TMGT ≤ 20°C strains could provide lower intrinsic DNA flexibility which strongly associated with optimal molecular dynamics, and then guarantee DNA function at lower growth temperatures. This analysis of codon bias revealed close relationships for thermal adaptation, GC content at synonymous sites (≈GC3), intrinsic DNA flexibility and optimal DNA dynamics. Natural selection was main force driving this codon bias; strains with lower TMGT endured stronger natural selection. Therefore, this study provided molecular basis for bacterial adaptive evolution from moderate temperature to low temperature.
Asunto(s)
Actinomycetales/fisiología , Evolución Biológica , ADN Bacteriano/fisiología , Termotolerancia/fisiología , Actinomycetales/genética , Composición de Base , Uso de Codones , Cubierta de Hielo , Fenotipo , Filogenia , Termotolerancia/genéticaRESUMEN
One aerobic, Gram-stain-negative, rod-shaped bacterium, designated strain RB1R5T, was isolated from Renlongba glacier in Tibet Autonomous Region, China. Growth was observed at 4-25 °C and pH 7.0-8.0. Phylogenetic analysis based on 16S rRNA gene sequences revealed that strain RB1R5T belongs to the genus Flavobacterium, and its closest relatives are Flavobacterium luteum IMCC26026T and Flavobacterium psychroterrae CCM 8827T with 97.75 and 97.42% gene sequence similarities, respectively. The average nucleotide identity and DNA-DNA hybridization values between strain RB1R5T and its closest relative Flavobacterium luteum IMCC26026T were 78.02 and 21.8â%, respectively. The major cellular fatty acids were anteiso-C15â:â0 and summed feature 3 (comprising C16:1ω7c/C16:1ω6c). The sole menaquinone was MK-6. The major phospholipid was phosphatidylethanolamine. On the basis of phenotypic, phylogenetic and chemotaxonomic characterizations, strain RB1R5T represents a novel species of the genus Flavobacterium, for which the name Flavobacterium psychrotolerans sp. nov. is proposed. The type strain is RB1R5T (=CGMCC 1.23024T=NBRC 113060T).
Asunto(s)
Flavobacterium/clasificación , Cubierta de Hielo/microbiología , Filogenia , Técnicas de Tipificación Bacteriana , Composición de Base , China , ADN Bacteriano/genética , Ácidos Grasos/química , Flavobacterium/aislamiento & purificación , Hibridación de Ácido Nucleico , Fosfolípidos/química , ARN Ribosómico 16S/genética , Análisis de Secuencia de ADN , Tibet , Vitamina K 2/análogos & derivados , Vitamina K 2/químicaRESUMEN
Strains Sr36T and TMT4-23T were isolated from No. 1 glacier in Xinjiang Uygur Autonomous Region and Toumingmengke glacier in Gansu Province, PR China, respectively. They were Gram-stain-positive and rod-shaped micro-organisms. The optimum growth temperature of the two strains was 10-14 °C. Phylogenetic analysis showed that the two strains were related to members of the genus Cryobacterium. The average nucleotide identity (ANI) and digital DNA-DNA hybridization (dDDH) values between strain Sr36T and its close relatives Cryobacterium luteum Hh15T, Cryobacterium aureum Hh31T, Cryobacterium levicorallinum Hh34T and Cryobacterium flavum Hh8T were 81.16-87.24 and 28.0-32.5â%, respectively. The ANI and dDDH values between strain TMT4-23T and its close relative Cryobacterium psychrotolerans 0549T were 81.16 and 22.3â%. The polar lipids of strain Sr36T were diphosphatidylglycerol, phosphatidylglycerol, one unidentified glycolipid and three unidentified lipids. The polar lipids of strain TMT4-23T were diphosphatidylglycerol, phosphatidylglycerol, one unidentified glycolipid, one unidentified phospholipid and six unidentified lipids. The major fatty acids of strain Sr36T were anteiso-C15â:â0, iso-C16â:â0, anteiso-C17â:â0 and anteiso-C15â:â1. The major fatty acids of strain TMT4-23T were anteiso-C15â:â0, anteiso-C17â:â0, iso-C16â:â0, anteiso-C15â:â1 and iso-C15â:â1. Both strains contained 2,4-diaminobutyric acid and their predominant menaquinone was MK-10. On the basis of the phenotypic, phylogenetic and genotypic data, two novel species Cryobacterium ruanii sp. nov. (type strain = Sr36T=CGMCC 1.9275T=NBRC 113797T) and Cryobacterium breve sp. nov. (type strain =TMT4-23T=CGMCC 1.9556T=NBRC 113800T) are proposed.
Asunto(s)
Actinobacteria/clasificación , Cubierta de Hielo/microbiología , Filogenia , Actinobacteria/aislamiento & purificación , Técnicas de Tipificación Bacteriana , Composición de Base , China , ADN Bacteriano/genética , Ácidos Grasos/química , Glucolípidos/química , Hibridación de Ácido Nucleico , Fosfolípidos/química , ARN Ribosómico 16S/genética , Análisis de Secuencia de ADN , Vitamina K 2/químicaRESUMEN
Three strains, designated as LB1R34T, LB3P52T and ZT4R6T, were isolated from glaciers located on the Tibetan Plateau, PR China. The strains were Gram-stain-negative, aerobic, rod-shaped, non-motile and yellow. Phylogenetic analysis based on the 16S rRNA gene and genomic sequences indicated that they were related to the members of the genus Flavobacterium. The 16S rRNA gene sequences similarities between the three strains were 92.31-96.93â%. The average nucleotide identity values and digital DNA-DNA hybridization values between these three strains and their closest relatives were 76.80-91.33â% and 21.3-44.2â%, respectively. LB1R34T, LB3P52T and ZT4R6T contained MK-6 as the major menaquinone, summed feature 3 (comprising C16â:â1ω7c and/or C16â:â1ω6c) and iso-C15â:â0 as the major fatty acids. Phosphatidylethanolamine was present in their polar lipids profiles. On the basis of the phenotypic characteristics, he results of phylogenetic analysis and genotypic data, three novel species, Flavobacterium restrictum sp. nov. (type strain=LB1 R34T=CGMCC 1.11493T=NBRC 113650T), Flavobacterium rhamnosiphilum sp. nov. (type strain=LB3 P52T=CGMCC 1.11446T=NBRC 113776T) and Flavobacterium zepuense sp. nov. (type strain=ZT4 R6T=CGMCC 1.11919T=NBRC 113653T) are proposed.
Asunto(s)
Flavobacterium/clasificación , Cubierta de Hielo/microbiología , Filogenia , Técnicas de Tipificación Bacteriana , Composición de Base , China , ADN Bacteriano/genética , Ácidos Grasos/química , Flavobacterium/aislamiento & purificación , Hibridación de Ácido Nucleico , Fosfatidiletanolaminas/química , ARN Ribosómico 16S/genética , Análisis de Secuencia de ADN , Vitamina K 2/análogos & derivados , Vitamina K 2/químicaRESUMEN
BACKGROUND: Tobacco stalk (TS), a major agricultural waste abundant in pectin, has resulted in concerns about the need for its reuse. The nicotine in TS is considered a chemical that is to\xic and hazardous to the environment. RESULTS: In this study, Bacillus tequilensis CAS-MEI-2-33 was isolated from cigar wrappers to produce alkaline pectinase using TS. Subsequently, the medium and fermentation conditions for the production of pectinase by B. tequilensis CAS-MEI-2-33 were optimized. The optimal fermentation period, pH of the initial fermentation medium, concentration of TS, and inoculum amount for B. tequilensis CAS-MEI-2-33 were 40 h, 40 g/L, 7.0, and 3%, respectively. Under optimal conditions, the pectinase activity was 1370 U/mL. Then, the enzymatic properties, such as the optimum pH, reaction temperature, temperature stability, and effects of metal ions, were studied. The optimal pH was determined to be 10.0, indicating that the enzyme was an alkaline pectinase. The optimal temperature was 40 °C, and pectinase activity was stable at 40 °C. The Ag+ metal ions were shown to remarkably promote enzyme activity. The pectinase was partly purified by ammonium sulfate precipitation, ion exchange chromatography, and Sephacryl S-100 chromatography. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and LC-MS/MS analyses were utilized to analyze the pectinase. CONCLUSIONS: This study provided a new alkaline pectinase candidate and a new strategy for the use of TS.
Asunto(s)
Bacillus/enzimología , Proteínas Bacterianas/metabolismo , Nicotiana/química , Pectinas/metabolismo , Poligalacturonasa/metabolismo , Bacillus/clasificación , Bacillus/genética , Estabilidad de Enzimas , Fermentación , Concentración de Iones de Hidrógeno , Microbiología Industrial/métodos , Filogenia , Temperatura , Nicotiana/metabolismo , Productos de Tabaco/microbiologíaRESUMEN
A Gram-stain-negative strain, designated GT1R17T, was isolated from an ervoconite sample collected from Gawalong glacier in the Tibet Autonomous Region, PR China. Strain GT1R17T was catalase- and oxidase-positive, and grew optimally at 20-25°C and pH 7.0. The highest level of 16S rRNA gene sequence similarities were found to members of the genera Nevskia(92.27-93.15â%) and Hydrocarboniphaga(91.92-92.96â%). Phylogenetic analyses based on 16S rRNA gene sequences and genomic data revealed that the strain GT1R17T belonged to the family Nevskiaceae, but could not be assigned to any known genera. The genomic DNA G+C content was 54.4 mol%. The major fatty acids were summed feature 3 (C16â:â1ω6c and/or C16â:â1ω7c), summed feature 8 (C18â:â1 ω7c and/or C18â:â1ω6c), C16â:â0, iso-C16â:â0 and summed feature 2 (C14â:â0 3OH and/or iso-C16â:â1 I). The polar lipids were phosphatidylglycerol, phosphatidylethanolamine and one unidentified lipid. The ubiquinone was Q-8. On the basis of the phenotypic, chemotaxonomic, genotypic and phylogenetic data, a novel species of a new genus,Stenotrophobiumrhamnosiphilum gen. nov., sp. nov. within the family Nevskiaceae, is proposed, with GT1R17T (=CGMCC 1.16137T=NBRC 113346T) as the type strain. In addition, phylogenetic analyses revealed that Steroidobacter and Povalibacter formed an independent clade in the order Nevskiales and were away from the families Nevskiaceae, Algiphilaceae and Salinisphaeraceae. Therefore, we propose to remove Steroidobacter and Povalibacter from the family Nevskiaceae and propose a new family Steroidobacteraceae in the order Nevskiales.
Asunto(s)
Gammaproteobacteria/clasificación , Cubierta de Hielo/microbiología , Filogenia , Técnicas de Tipificación Bacteriana , Composición de Base , ADN Bacteriano/genética , Ácidos Grasos/química , Gammaproteobacteria/aislamiento & purificación , Fosfolípidos/química , ARN Ribosómico 16S/genética , Análisis de Secuencia de ADN , Tibet , Ubiquinona/químicaRESUMEN
A psychrophilic, Gram-stain-positive, rod-shaped bacterium, designated Hh39T, was isolated from Xinjiang No. 1 glacier in PR China. Strain Hh39T was catalase-positive, oxidase-negative and could grow at 0-18 °C, pH 6.0-11.0 and in the presence of 0-2.5 % (w/v) NaCl. Phylogenetic analysis based on 16S rRNA gene sequences showed that strain Hh39T belonged to the genus Cryobacterium. The highest level of 16S rRNA gene sequence similarities were found to the type strains of Cryobacterium levicorallinum (99.01â%), Cryobacterium luteum (98.90â%), Cryobacterium aureum (98.90â%) and Cryobacterium roopkundense (98.75â%). However, the low average nucleotide identity (80.65-81.89 %) and digital DNA-DNA hybridization values (22.1-23.8 %) between strain Hh39T and its four closest relatives indicated that it represents a novel species of the genus Cryobacterium. The predominant fatty acids were anteiso-C15:0, anteiso-C15:1, iso-C16:0 and anteiso-C17:0. The major menaquinone was MK-10. The polar lipids were diphosphatidylglycerol, phosphatidylglycerol, one unidentified lipid and one unidentified glycolipid. On the basis of results of phenotypic, genotypic and phylogenetic analyses, a novel species, Cryobacterium melibiosiphilum sp. nov., is proposed, with Hh39T (=NBRC 107884T=CGMCC 1.11212T) as the type strain.
Asunto(s)
Actinobacteria/clasificación , Cubierta de Hielo/microbiología , Filogenia , Actinobacteria/aislamiento & purificación , Técnicas de Tipificación Bacteriana , Composición de Base , China , ADN Bacteriano/genética , Ácidos Grasos/química , Glucolípidos/química , Hibridación de Ácido Nucleico , Fosfolípidos/química , ARN Ribosómico 16S/genética , Análisis de Secuencia de ADN , Vitamina K 2/químicaRESUMEN
One bacterial strain, denoted as LB2P30T, was isolated from Laigu glacier located on the Tibetan Plateau, PR China. Strain LB2P30T was an aerobic, non-motile, rod-shaped, yellow-pigmented and Gram-stain-negative bacterium. The temperature range for growth was 4-20 °C (optimum, 14 °C). The phylogenetic analysis based on partial 16S rRNA gene sequences showed that strain LB2P30T belonged to the genus Flavobacterium and was most similar to Flavobacterium fluvii (98.12â%) and Flavobacterium limicola (97.91â%). The average nucleotide identity values between strain LB2P30T and its closest relatives, F. fluvii DSM 19978T and F. limicola DSM 15094T, were 76.73â% and 77.40â%, respectively. Cells of strain LB2P30T contained summed feature 3 (comprising C16:1ω7c and/or C16:1ω6c) and iso-C15â:â0 as the predominant fatty acids and menaquinone-6 as the sole menaquinone. The genomic DNA G+C content was 34.74 mol%. Based on the phenotypic, chemotaxonomic, genotypic and phylogenetic characteristics, we propose strain LB2P30T as a novel species of the genus Flavobacterium with the nomenclature of Flavobacteriumlaiguense sp. nov. The type strain is LB2P30T (=CGMCC 1.11271T=NBRC 113059T).