Biomedical subjects

Tae-Kwang Oh

Publications and source records attributed to Tae-Kwang Oh.

At least 37 records · Page 2Linked to original sources

PubMed2006

Sphingomonas dokdonensis sp. nov., isolated from soil.

A Gram-negative, rod-shaped, Sphingomonas-like bacterial strain, DS-4(T), was isolated from soil of Dokdo, Korea, and its taxonomic position was investigated using a polyphasic approach. Strain DS-4(T) grew optimally on trypticase soy agar medium without NaCl at pH 6.0-6.5 and 25 degrees C. It contained Q-10 as the predominant ubiquinone and C(18 : 1)omega7c, C(16 : 0), C(14 : 0) 2-OH and C(16 : 1)omega7c and/or iso-C(15 : 0) 2-OH as the major fatty acids. Sphingoglycolipid, phosphatidylcholine, phosphatidylglycerol, diphosphatidylglycerol, phosphatidylethanolamine and unidentified phospholipid were the major polar lipids. The DNA G+C content was 66.9 mol%. Phylogenetic analysis based on 16S rRNA gene sequences showed that strain DS-4(T) fell within the evolutionary radiation comprising Sphingomonas species. Levels of 16S rRNA gene sequence similarity between strain DS-4(T) and the type strains of Sphingomonas species ranged from 93.0 to 97.6 %. DNA-DNA relatedness data and differential phenotypic properties, together with the phylogenetic distinctiveness, demonstrated that strain DS-4(T) differs from the recognized Sphingomonas species. On the basis of phenotypic, phylogenetic and genetic data, this strain represents a novel species of the genus Sphingomonas, for which the name Sphingomonas dokdonensis sp. nov. is proposed, with DS-4(T) (=KCTC 12541(T)=CIP 108841(T)) as the type strain.

Bacterial Typing Techniques↗

PubMed2006

Flavobacterium soli sp. nov., isolated from soil.

A Gram-negative, rod-shaped Flavobacterium-like bacterial strain, DS-6T, was isolated from soil from the island of Dokdo, Korea, and subjected to a polyphasic taxonomic study. Strain DS-6T grew optimally at pH 7.0 and 25 degrees C in the presence of 0-0.5 % (w/v) NaCl. It contained MK-6 as the predominant menaquinone and iso-C15:0 and iso-C17:0 3-OH as the major fatty acids. The DNA G+C content was 36.9 mol%. Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain DS-6T belonged to the genus Flavobacterium. Levels of 16S rRNA gene sequence similarity between strain DS-6T and the type strains of Flavobacterium species were below 95.4 %. Strain DS-6T differed from some phylogenetically related Flavobacterium species in several phenotypic characteristics. On the basis of phenotypic and phylogenetic distinctiveness, DS-6T (=KCTC 12542T=CIP 108840T) was classified in the genus Flavobacterium as the type strain of a novel species, for which the name Flavobacterium soli sp. nov. is proposed.

Bacterial Typing Techniques↗

PubMed2006

Nocardioides kongjuensis sp. nov., an N-acylhomoserine lactone-degrading bacterium.

A Gram-positive, rod- or coccoid-shaped and N-hexanoyl-l-homoserine lactone-degrading bacterial strain, A2-4(T), was isolated from a soil in Korea, and its taxonomic position was investigated by using a polyphasic approach. Strain A2-4(T) grew optimally at pH 7.0-8.0 and 30 degrees C without NaCl. Phylogenetic analyses based on 16S rRNA gene sequences revealed that strain A2-4(T) is most closely related to members of the genus Nocardioides. Strain A2-4(T) possessed chemotaxonomic properties indicative of members of the genus Nocardioides; the cell-wall peptidoglycan type was based on ll-diaminopimelic acid, MK-8(H(4)) was the predominant menaquinone and iso-C(16 : 0) was the predominant fatty acid. The DNA G+C content was 72.1 mol%. The 16S rRNA gene sequence of strain A2-4(T) was 98.3-99.1 % similar to those of the type strains of Nocardioides simplex, Nocardioides aromaticivorans and Nocardioides nitrophenolicus and 93.8-96.3 % similar to those of the type strains of other Nocardioides species. Strain A2-4(T) could be distinguished from the three phylogenetic relatives, N. nitrophenolicus, N. aromaticivorans and N. simplex, by DNA-DNA relatedness (25-42 %) and by differences in some phenotypic characteristics. On the basis of the phenotypic, phylogenetic and genetic data, the strain represents a novel species of the genus Nocardioides, for which the name Nocardioides kongjuensis sp. nov. is proposed. The type strain is A2-4(T) (=KCTC 19054(T)=JCM 12609(T)).

Actinobacteria↗

PubMed2006

Pedobacter sandarakinus sp. nov., isolated from soil.

A Gram-negative, non-motile, rod-shaped bacterial strain, designated DS-27(T), was isolated from a soil sample, and its taxonomic position was investigated by using a polyphasic approach. The organism grew optimally at 30 degrees C and in the presence of 0-0.5 % (w/v) NaCl. Strain DS-27(T) contained MK-7 as the predominant menaquinone and iso-C(15 : 0), C(16 : 1)omega7c and/or iso-C(15 : 0) 2-OH and iso-C(17 : 0) 3-OH as the major fatty acids. The DNA G + C content was 39.7 mol%. Phylogenetic analyses based on 16S rRNA gene sequences revealed that strain DS-27(T) is most closely related to the genus Pedobacter of the family Sphingobacteriaceae. Similarity values between the 16S rRNA gene sequences of strain DS-27(T) and the type strains of recognized Pedobacter species ranged from 90.6 to 95.5 %. Differential phenotypic properties, together with the phylogenetic distinctiveness, were sufficient to categorize strain DS-27(T) as representing a species that is separate from recognized Pedobacter species. On the basis of its phenotypic properties and phylogenetic distinctiveness, strain DS-27(T) (=KCTC 12559(T) = CIP 108922(T)) was classified in the genus Pedobacter as a member of a novel species, for which the name Pedobacter sandarakinus sp. nov. is proposed.

Culture Media↗

PubMed2006

Brevundimonas terrae sp. nov., isolated from an alkaline soil in Korea.

A Gram-negative, rod-shaped, Brevundimonas-like bacterial strain, KSL-145(T), was isolated from an alkaline soil in Korea and subjected to a polyphasic taxonomic investigation. Strain KSL-145(T) grew optimally at pH 7.5-8.0 and 30 degrees C without NaCl. It was characterized chemotaxonomically as containing Q-10 as the predominant ubiquinone and C(18 : 1)omega7c and C(16 : 0) as the major fatty acids. The DNA G+C content was 61.8 mol%. A phylogenetic analysis based on 16S rRNA gene sequences showed that strain KSL-145(T) fell within the radiation of the cluster comprising Brevundimonas species and Mycoplana bullata. The levels of 16S rRNA gene sequence similarity between strain KSL-145(T) and the type strains of Brevundimonas species and M. bullata ranged from 95.3 to 98.7 %. The mean DNA-DNA relatedness values between strain KSL-145(T) and the type strains of Brevundimonas diminuta and M. bullata, the closest phylogenetic relatives, were 26 and 15 %, respectively. Strain KSL-145(T) could be differentiated from Brevundimonas species and M. bullata by differences in several phenotypic characteristics. On the basis of the phenotypic, phylogenetic and genetic data, strain KSL-145(T) represents a novel species in the genus Brevundimonas, for which the name Brevundimonas terrae sp. nov. is proposed. The type strain is KSL-145(T) (=KCTC 12481(T)=JCM 13476(T)).

Bacterial Typing Techniques↗

PubMed2006

Yonghaparkia alkaliphila gen. nov., sp. nov., a novel member of the family Microbacteriaceae isolated from an alkaline soil.

Two Gram-positive, non-motile, non-spore-forming and rod-shaped actinomycete strains, KSL-113(T) and KSL-133, were isolated from an alkaline soil in Korea, and their taxonomic positions were investigated by using a polyphasic approach. The strains grew optimally at 30 degrees C and pH 9.0. Phenotypic, phylogenetic and genetic similarities indicated that strains KSL-113(T) and KSL-133 represent the same species. Phylogenetic analyses based on 16S rRNA gene sequences showed that strains KSL-113(T) and KSL-133 fell within the family Microbacteriaceae of the suborder Micrococcineae, the highest 16S rRNA gene sequence similarity values (98.2 %) being obtained with respect to Microcella putealis CV-2(T). The 16S rRNA gene sequence similarities between strains KSL-113(T) and KSL-133 and the other members of the family Microbacteriaceae used in the phylogenetic analysis were less than 96.0 %. Strains KSL-113(T) and KSL-133 could be clearly distinguished from members of the family Microbacteriaceae on the basis of differences in chemotaxonomic properties, including the predominant menaquinone type, the cell-wall peptidoglycan type and the fatty acid profile. Accordingly, on the basis of the combined phenotypic, chemotaxonomic and phylogenetic data, strains KSL-113(T) and KSL-133 constitute a novel genus and species of the family Microbacteriaceae, for which the name Yonghaparkia alkaliphila gen. nov., sp. nov. is proposed. The type strain of Yonghaparkia alkaliphila is KSL-113(T) (=KCTC 19126(T)=CIP 108920(T)).

Actinomycetales↗

PubMed2006

Nesterenkonia jeotgali sp. nov., isolated from jeotgal, a traditional Korean fermented seafood.

A Gram-positive, non-motile, slightly halophilic actinomycete, strain JG-241T, was isolated from jeotgal, a traditional Korean fermented seafood, and its taxonomic position was investigated by using a polyphasic approach. Strain JG-241T grew optimally at 25-30 degrees C and in the presence of 2-5% (w/v) NaCl. The physiological and biochemical properties of strain JG-241T were distinguishable from those of recognized Nesterenkonia species. Strain JG-241T had a peptidoglycan type based on L-lys-gly-D-Asp. It contained MK-7, MK-8 and MK-9 as the predominant menaquinones and anteiso-C15:0) and anteiso-C17:0 as the major fatty acids. The major polar lipids were diphosphatidylglycerol, phosphatidylglycerol, phosphatidylinositol and an unidentified glycolipid. The DNA G+C content was 68.0 mol%. Comparative 16S rRNA gene sequence analysis showed that strain JG-241T falls within the radiation of the cluster comprising Nesterenkonia species. Similarity values between the 16S rRNA gene sequence of strain JG-241T and those of the type strains of Nesterenkonia species ranged from 96.7 to 99.7%. DNA-DNA relatedness data and repetitive extragenic palindromic DNA-PCR genomic fingerprinting patterns showed that strain JG-241T differs genetically from recognized Nesterenkonia species. On the basis of its phenotypic properties and phylogenetic and genetic distinctiveness, strain JG-241T represents a novel species of the genus Nesterenkonia, for which the name Nesterenkonia jeotgali sp. nov. is proposed. The type strain is JG-241T (=KCTC 19053T=JCM 12610T).

Base Composition↗

PubMed2006

Tenacibaculum aestuarii sp. nov., isolated from a tidal flat sediment in Korea.

A novel Tenacibaculum-like bacterial strain, SMK-4(T), was isolated from a tidal flat sediment in Korea. Strain SMK-4(T) was Gram-negative, pale yellow-pigmented and rod-shaped. It grew optimally at 30-37 degrees C and in the presence of 2-3 % (w/v) NaCl. It contained MK-6 as the predominant menaquinone and iso-C(15 : 0), iso-C(16 : 0) 3-OH and C(16 : 1)omega7c and/or iso-C(15 : 0) 2-OH as the major fatty acids (>10 % of total fatty acids). The DNA G+C content was 33.6 mol%. Phylogenetic trees based on 16S rRNA gene sequences showed that strain SMK-4(T) fell within the evolutionary radiation encompassed by the genus Tenacibaculum. Strain SMK-4(T) exhibited 16S rRNA gene sequence similarity levels of 95.2-98.6 % with respect to the type strains of recognized Tenacibaculum species. DNA-DNA relatedness levels and differential phenotypic properties made it possible to categorize strain SMK-4(T) as a species that is separate from previously described Tenacibaculum species. On the basis of phenotypic properties and phylogenetic and genetic distinctiveness, strain SMK-4(T) (=KCTC 12569(T)=JCM 13491(T)) should be classified as a novel Tenacibaculum species, for which the name Tenacibaculum aestuarii sp. nov. is proposed.

Bacterial Typing Techniques↗

PubMed2006

Isoptericola dokdonensis sp. nov., isolated from soil.

A Gram-positive, non-motile, rod- or coccoid-shaped Isoptericola-like bacterium, strain DS-3(T), was isolated from a soil sample from Dokdo, Korea, and its taxonomic position was investigated by a polyphasic approach. The organism grew optimally at 30 degrees C and pH 7.0-8.0. Strain DS-3(T) had the peptidoglycan type based on l-lys-d-Asp, and galactose, glucose, rhamnose and ribose as the whole-cell sugars. It contained MK-9(H(4)) as the predominant menaquinone and anteiso-C(15 : 0) and iso-C(15 : 0) as the major fatty acids. The major polar lipids were diphosphatidylglycerol, phosphatidylglycerol, phosphatidylinositol and two unidentified glycolipids. The DNA G+C content was 74.1 mol%. Phylogenetic analysis based on 16S rRNA gene sequences showed that strain DS-3(T) was most closely related to members of the genus Isoptericola. Similarity values between the 16S rRNA gene sequences of strain DS-3(T) and the type strains of Isoptericola species ranged from 98.0 to 98.4 %. DNA-DNA relatedness values (11-23 %) and differential phenotypic properties demonstrated that strain DS-3(T) was distinguishable from recognized Isoptericola species. On the basis of phenotypic properties and phylogenetic and genetic distinctiveness, strain DS-3(T) represents a novel species in the genus Isoptericola, for which the name Isoptericola dokdonensis sp. nov. is proposed. The type strain is DS-3(T) (=KCTC 19128(T)=CIP 108921(T)).

Actinomycetales↗

PubMed2006

Kribbia dieselivorans gen. nov., sp. nov., a novel member of the family Intrasporangiaceae.

Two Gram-positive, catalase-positive, irregular short rod- or coccoid-shaped bacterial strains, N113(T) and R33, were isolated from an enrichment culture with diesel oil-degradation activity and their taxonomic positions were investigated using a polyphasic approach. Phenotypic, phylogenetic and genetic similarities indicated that strains N113(T) and R33 were representatives of the same species. Phylogenetic analysis based on 16S rRNA gene sequences showed that strains N113(T) and R33 form a lineage independent from those of members of the family Intrasporangiaceae. The novel isolates had cell-wall peptidoglycan based on meso-diaminopimelic acid, MK-8(H(4)) as the predominant menaquinone and 10-methyl-C(18 : 0), iso-C(16 : 0), C(18 : 1)omega9c, C(16 : 0) and C(18 : 0) as the major cellular fatty acids. The DNA G+C contents were 69.6-69.9 mol%. These chemotaxonomic properties, together with phylogenetic distinctiveness, distinguish the two novel strains from recognized members of the family Intrasporangiaceae. On the basis of phenotypic, phylogenetic and genetic data, strains N113(T) (=KCTC 19143(T)=JCM 13585(T)) and R33 are classified as representatives of a novel genus and species, Kribbia dieselivorans gen. nov., sp. nov., within the family Intrasporangiaceae.

Actinomycetales↗

PubMed2005

The molecular structure and catalytic mechanism of a quorum-quenching N-acyl-L-homoserine lactone hydrolase.

In many Gram-negative bacteria, including a number of pathogens such as Pseudomonas aeruginosa and Erwinia carotovora, virulence factor production and biofilm formation are linked to the quorum-sensing systems that use diffusible N-acyl-L-homoserine lactones (AHLs) as intercellular messenger molecules. A number of organisms also contain genes coding for lactonases that hydrolyze AHLs into inactive products, thereby blocking the quorum-sensing systems. Consequently, these enzymes attract intense interest for the development of antiinfection therapies. However, the catalytic mechanism of AHL-lactonase is poorly understood and subject to controversy. We here report a 2.0-angstroms resolution structure of the AHL-lactonase from Bacillus thuringiensis and a 1.7-angstroms crystal structure of its complex with L-homoserine lactone. Despite limited sequence similarity, the enzyme shows remarkable structural similarities to glyoxalase II and RNase Z proteins, members of the metallo-beta-lactamase superfamily. We present experimental evidence that AHL-lactonase is a metalloenzyme containing two zinc ions involved in catalysis, and we propose a catalytic mechanism for bacterial metallo-AHL-lactonases.

Bacillus thuringiensis↗

PubMed2005

Zinc in lipase L1 from Geobacillus stearothermophilus L1 and structural implications on thermal stability.

Lipase L1 from Geobacillus stearothermophilus L1 contains an unusual extra domain, making a tight intramolecular interaction with the main catalytic domain through a Zn2+-binding coordination. To elucidate the role of the Zn2+, we disrupted the Zn2+-binding site by mutating the zinc-ligand residues (H87A, D61A/H87A, and D61A/H81A/H87A/D238A). The activity vs. temperature profiles of the mutant enzymes showed that the disruption of the Zn2+-binding site resulted in a notable decrease in the optimal temperature for maximal activity from 60 to 45-50 degrees C. The mutations also abolished the Zn2+-induced thermal stabilization. The wild-type enzyme revealed a 34.6-fold increase in stabilization with the addition of Zn2+ at 60 degrees C, whereas the mutant enzymes exhibited no response to Zn2+. Additional circular dichroism spectroscopy studies also confirmed the structural stabilizing role of Zn2+ on lipase L1 at elevated temperatures.

Amino Acid Sequence↗

PubMed2005

Crystallization and preliminary crystallographic analysis of Bacillus thuringiensis AHL-lactonase.

The quorum sensing (QS) systems in Gram-negative bacteria are mostly associated with diffusible N-acyl-L-homoserine lactones (AHLs). AHL-degrading enzymes hydrolyze the AHLs into inactive molecules, thereby blocking the QS systems that are closely linked to virulence factor production and biofilm formation. Consequently, these enzymes have recently attracted intense interest for the development of anti-infection therapies for plants and animals. However, despite significant progress in the investigation of AHL-degrading enzymes, no structure is yet available. Accordingly, this study reports on the expression and purification of the AHL-lactonase from Bacillus thuringiensis subsp. kurstaki HD263, as well as the successful crystallization of the enzyme. High-quality native crystals were obtained and a complete data set collected at 2.0 A resolution. The native crystal was found to belong to the space group P2(1)2(1)2(1), with unit cell parameters a=52.7 A, b=55.9 A, and c=74.1 A and one molecule in the asymmetric unit. MAD data were also collected at 2.4 A resolution for a SeMet-substituted crystal.

Bacillus thuringiensis↗

PubMed2005

Analyses of enzyme II gene mutants for sugar transport and heterologous expression of fructokinase gene in Corynebacterium glutamicum ATCC 13032.

Corynebacterium glutamicum ATCC 13032 has four enzyme II (EII) genes of the phosphotransferase system in its genome encoding transporters for sucrose, glucose, fructose, and an unidentified EII. To analyze the function of these EII genes, they were inactivated via homologous recombination and the resulting mutants characterized for sugar utilization. Whereas the sucrose EII was the only transport system for sucrose in C. glutamicum, fructose and glucose were each transported by a second transporter in addition to their corresponding EII. In addition, the ptsF ptsG double mutant carrying deletions in the EII genes for fructose and glucose accumulated fructose in the culture broth when growing on sucrose. As no fructokinase gene exists in the C. glutamicum genome, the fructokinase gene from Clostridium acetobutylicum was expressed in C. glutamicum and resulted in the direct phosphorylation of fructose without any fructose efflux. Accordingly, since fructokinase could direct fructose flux to the pentose phosphate pathway for the supply of NADPH, fructokinase expression may be a potential strategy for enhancing amino acid production.

Corynebacterium glutamicum↗

PubMed2005

High-level heterologous expression and properties of a novel lipase from Ralstonia sp. M1.

The mature lipase LipA and its 56aa-truncated chaperone DeltaLipBhis (with 6xhis-tag) from Ralstonia sp. M1 were over-expressed in Escherichia coli BL21 under the control of T7 promoter with a high level of 70 and 12mg protein per gram of wet cells, respectively. The simply purified lipase LipA was effectively refolded by Ni-NTA purified chaperone DeltaLipBhis in molar ratio 1:1 at 4 degrees C for 24 hours in H2O. The in vitro refolded lipase LipA had an optimal activity in the temperature range of 50-55 degrees C and was stable up to 45 degrees C with more than 84% activity retention. The maximal activity was observed at pH 10.75 for hydrolysis of olive oil and found to be stable over alkaline pH range 8.0-10.5 with more than 52% activity retention. The enzyme was found to be highly resistant to many organic solvents especially induced by ethanolamine (remaining activity 137-334%), but inhibited by 1-butanol and acetonitrile (40-86%). Metal ions Cu2+, Sn2+, Mn2+, Mg2+, and Ca2+ stimulated the lipase slightly with increase in activity by up to 22%, whereas Zn2+ significantly inhibited the enzyme with the residual activity of 30-65% and Fe3+ to a lesser degree (activity retention of 77-86%). Tween 80, Tween 60, and Tween 40 induced the activation of the lipase LipA (222-330%) and 0.2-1% (w/v) of Triton X-100, X-45, and SDS increased the lipase activity by up to 52%. However, 5% (w/v) of Triton X-100, X-45, and SDS inhibited strongly the activity by 31-89%. The inhibitors including DEPC, EDTA, PMSF, and 2-mercaptoethanol (0.1-10mM) inhibited moderately the lipase with remaining activity of 57-105%. The lipase LipA hydrolyzed a wide range of triglycerides, but preferentially short length acyl chains (C4 and C6). In contrast to the triglycerides, medium length acyl chains (C8 and C14) of p-nitrophenyl (p-NP) esters were preferential substrates of this lipase. The enzyme preferentially catalyzed the hydrolysis of cottonseed oil (317%), cornoil (227%), palm oil (222%), and wheatgerm oil (210%) in comparison to olive oil (100%).

Bacterial Proteins↗

PubMed2005

Muricauda flavescens sp. nov. and Muricauda aquimarina sp. nov., isolated from a salt lake near Hwajinpo Beach of the East Sea in Korea, and emended description of the genus Muricauda.

Four Gram-negative, non-spore-forming, slightly halophilic rods (strains SW-62(T), SW-74, SW-63(T) and SW-72) with appendages were isolated from a salt lake near Hwajinpo Beach on the East Sea in Korea, and subjected to a polyphasic taxonomic analysis. Phylogenetic analyses based on 16S rRNA gene sequences showed that strains SW-62(T), SW-74, SW-63(T) and SW-72 formed a coherent cluster with Muricauda ruestringensis. Strains SW-62(T) and SW-74 had the same 16S rRNA gene sequence, as did strains SW-63(T) and SW-72. The level of 16S rRNA gene sequence similarity between strains SW-62(T) and SW-63(T) was 97.0 %. Strains SW-62(T) and SW-63(T) exhibited 16S rRNA gene similarity levels of 96.5 and 98.3 %, respectively, with respect to M. ruestringensis DSM 13258(T). The predominant isoprenoid quinone found in the four isolates and M. ruestringensis DSM 13258(T) was MK-6. The four strains contained iso-C(17 : 0) 3-OH, iso-C(15 : 1) and iso-C(15 : 0) as the major fatty acids. Their DNA G + C contents were 44.1-45.4 mol%. The levels of DNA-DNA relatedness indicated that strains SW-62(T) and SW-74 and strains SW-63(T) and SW-72 were members of two species that were different from M. ruestringensis. On the basis of phenotypic and phylogenetic data and genomic distinctiveness, strains SW-62(T) and SW-74 and strains SW-63(T) and SW-72 were placed in the genus Muricauda as two distinct novel species, for which the names Muricauda flavescens sp. nov. (type strain, SW-62(T) = KCCM 41645(T) = JCM 11812(T)) and Muricauda aquimarina sp. nov. (type strain, SW-63(T) = KCCM 41646(T) = JCM 11811(T)), respectively, are proposed.

Bacterial Typing Techniques↗

PubMed2005

Psychrobacter alimentarius sp. nov., isolated from squid jeotgal, a traditional Korean fermented seafood.

Two Gram-negative, non-motile, non-spore-forming, moderately halophilic strains, JG-100T and JG-102, were isolated from squid jeotgal, a traditional Korean fermented seafood. The two strains grew optimally at 30 degrees C and in the presence of 2-3 % (v/w) NaCl. Strains JG-100T and JG-102 were characterized chemotaxonomically; they both had ubiquinone-8 as the predominant respiratory lipoquinone and C(18 : 1)omega9c as the major fatty acid. Their DNA G+C content was 44 mol%. Strains JG-100T and JG-102 showed 1 bp difference in their 16S rRNA gene sequences and a mean DNA-DNA relatedness level of 88 %. Phylogenetic analysis based on 16S rRNA gene sequences showed that strains JG-100T and JG-102 form a distinct phylogenetic lineage within the cluster comprising Psychrobacter species. The 16S rRNA gene sequences of strains JG-100T and JG-102 had similarity levels of 95.2-98.4 % to sequences of the type strains of recognized Psychrobacter species. Levels of DNA-DNA relatedness between strains JG-100T and JG-102 and the type strains of some phylogenetically related Psychrobacter species were 6-24 %. On the basis of phenotypic and phylogenetic data and genomic distinctiveness, strains JG-100T and JG-102 should be placed in the genus Psychrobacter as a novel species, for which the name Psychrobacter alimentarius sp. nov. (type strain, JG-100T=KCTC 12186T=DSM 16065T) is proposed.

Animals↗

PubMed2005

Bacillus cibi sp. nov., isolated from jeotgal, a traditional Korean fermented seafood.

A Gram-variable, motile, endospore-forming, halotolerant bacillus, strain JG-30(T), was isolated from the traditional Korean fermented seafood jeotgal, and was subjected to a polyphasic taxonomic study. This organism grew optimally at 37 degrees C and in the presence of 0-1 % (w/v) NaCl. 16S rRNA gene sequence analysis showed that strain JG-30(T) forms a distinct phylogenetic lineage within the evolutionary radiation encompassed by the genus Bacillus. Strain JG-30(T) was characterized chemotaxonomically as having cell-wall peptidoglycan based on meso-diaminopimelic acid, MK-7 as the predominant menaquinone and iso-C(15 : 0) and iso-C(14 : 0) as the major fatty acids. The DNA G+C content was 45 mol%. Strain JG-30(T) exhibited levels of 16S rRNA gene sequence similarity of less than 95.7 % to Bacillus species with validly published names. On the basis of its phenotypic properties and phylogenetic distinctiveness, strain JG-30(T) (=KCTC 3880(T)=DSM 16189(T)) was classified within the genus Bacillus as a novel species, for which the name Bacillus cibi sp. nov. is proposed.

Bacillus↗