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901.
Soo Hyung Eo Woo-Shin Lee Byeong-Ju Lee Byung June Ko Jong U. Kim Jong Hoon Jeon 《Genes & genomics.》2016,38(4):351-357
Understanding the impacts of forest management practices on genetic diversity is essential for effective animal management and conservation. We characterized novel microsatellite loci in the Ussuri white-toothed shrew (Crocidura lasiura Dobson, 1890) to test the impacts of anthropogenic thinning of forest trees on the shrew populations and their genetic diversity. Using Ion Torrent sequencing technology, we characterized 611 potential microsatellite markers with complete di- to tetra-nucleotide motifs, identifying nine polymorphic loci. The observed and expected heterozygosities across the nine loci were 0.526 and 0.527, respectively. Mean allelic diversity was 5.2 alleles per locus, with the mean polymorphism information content at 0.498. In comparison among shrew populations, which inhabited in the forests thinned in 2004 (CLA; n = 10), 2008 (CLB; n = 9) and 2014 (CLC; n = 3), the observed heterozygosities are similar among the three populations (0.525 at CLA, 0.532 at CLB and 0.519 at CLC), whereas the expected heterozygosities were much lower in population of CLC (0.377) than that of CLA (0.509) and CLB (0.533). The small sample size at CLC limited effective comparison and evaluation of the impact of forest thinning on genetic diversity in this shrew population. Future application of the species-specific microsatellite markers described here to a larger sample size would be valuable in estimating the ecological parameters of shrew populations associated with existing forest management practices. 相似文献
902.
Leonid N. Ten Jongguen Jeon Su-Jin Park Sangkyu Park Seung-Yeol Lee Myung Kyum Kim Hee-Young Jung 《Antonie van Leeuwenhoek》2018,111(3):333-341
A Gram-stain negative, non-motile, rod-shaped, aerobic bacterium, designated 15J8-8T, was isolated from a soil sample collected on Jeju Island, South Korea, and characterized taxonomically using a polyphasic approach. Comparative 16S rRNA gene sequence analysis showed that strain 15J8-8T belongs to the family Cytophagaceae and is related to Larkinella bovis M2TB15T (95.0%), ‘Larkinella harenae’ 15J9-9 (94.5%), Larkinella arboricola Z0532T (93.2%), and Larkinella insperata LMG 22510T (93.0%). The DNA G+C content of strain 15J8-8T was 50.5 mol%. The detection of phosphatidylethanolamine and two unidentified polar lipids as major polar lipids; menaquinone-7 as the predominant quinone; and C16:1 ω5c, C16:0 N alcohol, and iso-C15:0 as the major fatty acids also supported the affiliation of the isolate to the genus Larkinella. Based on its phenotypic properties and phylogenetic distinctiveness, strain 15J8-8T should be classified in the genus Larkinella as representative of a novel species, for which the name Larkinella terrae sp. nov. is proposed. The type strain is 15J8-8T (= KCTC 52001T = JCM 31990T). 相似文献
903.
904.
Kyung Hyun Kim Ga Youn Cho Byung Hee Chun Stefan Weckx Ji Young Moon Soo-Hwan Yeo Che Ok Jeon 《Systematic and applied microbiology》2018,41(4):324-332
Twelve Acetobacter pasteurianus-related strains with publicly available genomes in GenBank shared high 16S rRNA gene sequence similarity (>99.59%), but average nucleotide identity (ANI) and in silico DNA-DNA hybridization (DDH) values and multilocus sequence- and genome-based relatedness analyses suggested that they were divided into four different phylogenetic lineages. Relatedness analyses based on multilocus sequences, 1,194 core genes and whole-cell MALDI-TOF profiles supported that strains LMG 1590T and LMG 1591 (previously classified as the type strains of A. pasteurianus subsp. ascendens and paradoxus, respectively) and strain SLV-7T do not belong to A. pasteurianus. Strain SLV-7T, isolated from Korean traditional vinegar, shared low ANI (<91.0%) and in silico DDH (44.2%) values with all other Acetobacter type strains analyzed in this study, indicating that strain SLV-7T represents a new Acetobacter species. The phenotypic and chemotaxonomic analyses confirmed these results and therefore a new species named Acetobacter oryzifermentans sp. nov. is proposed with SLV-7T (= KACC 19301T = JCM 31096T) as the type strain. Strains LMG 1590T and LMG 1591 shared high ANI (99.4%) and in silico DDH (96.0%) values between them, but shared low ANI (<92.3%) and in silico DDH (<49.0%) values with other type strains analyzed in this study, indicating that strains LMG 1590T and LMG 1591 should be reclassified into a new single species that should be named Acetobacter ascendens sp. nov., comb. nov., with LMD 51.1T (= LMG 1590T = NCCB 51001T) as its type strain. 相似文献
905.
906.
Chi Hyun Kim Hee Young Kang Bo Ra Kim Hyejin Jeon Yoo Chul Lee Sang Hwa Lee Je Chul Lee 《Journal of microbiology (Seoul, Korea)》2016,54(1):44-49
This study investigated the mechanisms underlying the carbapenem resistance of bloodstream isolates of Pseudomonas aeruginosa obtained from two Korean hospitals. Of the 79 P. aeruginosa isolates, 22 and 21 were resistant to imipenem and meropenem, respectively. The 22 imipenem-resistant P. aeruginosa isolates were classified into 7 sequence types (STs) and 13 pulsotypes. Twelve imipenem-resistant isolates from one hospital were found to belong to the international clone ST111. Two imipenem-resistant P. aeruginosa ST235 isolates carried the bla IMP-6 gene, but the remaining 20 isolates did not produce carbapenemases. Mutations in the oprD gene and a related decrease in gene expression were found in 21 and 5 isolates, respectively. However, all imipenemresistant P. aeruginosa isolates showed no significant expression of OprD in the outer membrane as compared with that of carbapenem-susceptible PAO1 strain. Overexpression of genes associated with efflux pumps, including mexB, mexD, mexF, and mexY, was not found in any imipenem-resistant isolate. One imipenem-resistant P. aeruginosa isolate overexpressed the ampC gene. Our results show that the low permeability of drugs due to the mutational inactivation of OprD is primarily responsible for carbapenem resistance in bloodstream isolates of P. aeruginosa from Korean hospitals. 相似文献
907.
Jae-Bong Lee Seon Hwa Jeon Seok-Gwan Choi Hee-Young Jung Myung Kyum Kim Sathiyaraj Srinivasan 《Journal of microbiology (Seoul, Korea)》2016,54(12):809-813
In this paper, a new bacterial strain designated as 16MFT21T is isolated from the muscle of a fish caught in the Antarctic Ocean. Strain 16MFT21T is a Gram-staining-positive, catalase-oxidase-positive, rod-shaped facultative-aerobic bacterium. The phylogenetic analysis that is based on the 16S-rRNA gene sequence of strain 16MFT21T revealed that it belongs to the genus Bacillus in the family Bacillaceae in the class Bacilli. The highest degrees of the sequence similarity of the strain 16MFT21T is with Bacillus licheniformis ATCC 14580T (96.6%) and Bacillus sonorensis NBRC 101234T (96.6%). The isolate formed a pale-yellow pigment, and it grew in the presence of 0% to 10% (w/v) NaCl (optimum at 2% NaCl), a pH of 6.0 to 10.0 (optimum pH from 7.0 to 8.0), and from 4°C to 30°C (optimum at 30°C). The major polar lipids consist of diphosphatidylglycerol (DPG) and phosphatidylglycerol (PG). The predominant fatty acids are iso-C15:0, anteiso-C15:0, iso-C17:0, and anteiso-C17:0. The main respiratory quinone is menaquinone-7 (MK-7), and based on the use of the meso-diaminopimelic acid as the diagnostic diamino acid, the peptidoglycan cell-wall type is A1γ. Based on the phylogenetic, phenotypic, and chemotaxonomic data, strain 16MFT21T (=KCTC 18866T =JCM 31664T) for which the name Bacillus piscis sp. nov. is proposed should be classified as a new species. 相似文献
908.
Jinmoon Kim Sungil Jang Aeryun Kim Hanfu Su Niluka Gunawardhana Yeong-Eui Jeon Eun Jung Bak Ji-Hye Kim Jeong-Heon Cha 《Journal of microbiology (Seoul, Korea)》2016,54(5):396-402
Mammalian γ-glutamyltranspeptidase (GGT) has been identified as a bone-resorbing factor. Since GGT of Bacillus subtilis exhibits similarity in their primary structure and enzymatic characteristics with mammalian GGTs, the bone-resorbing activity of bacterial GGT was examined in this study. Osteoclastogenesis was performed in a co-culture system of mouse calvaria-derived osteoblasts and bone marrow cells. A conditioned medium from GGT-overproducing B. subtilis culture showed significantly higher activity of osteoclast formation than a conditioned medium from wild-type B. subtilis culture. Recombinant GGT (rGGT) of wild-type B. subtilis and an enzymatic activity-defected rGGT of B. subtilis 2288 mutant were expressed in Escherichia coli and purified using His tag. Both purified rGGTs induced similar levels of osteoclastogenesis, suggesting that B. subtilis GGT possesses virulent bone-resorbing activity and its activity is probably independent of its enzymatic activity. Furthermore, a recombinant protein of B. subtilis GGT heavy subunit (Bs rGGT/H) showed strong activity of osteoclastogenesis while the light subunit failed to show strong activity, suggesting that the bone-resorbing activity is mainly located at the heavy subunit. More importantly, the GGT enzymatic activity may not be required for this virulence activity since the light subunit contains the catalytic pocket. In addition, B. subtilis rGGT stimulated mRNA expressions of receptor activator of nuclear factor kappa-B ligand (RANKL) and cyclooxygenase-2 (COX-2), while an osteoprotegerin inhibited the osteoclast formation induced by Bs rGGT/H. This is the first demonstration that bacterial GGT itself is sufficient to act as a bone-resorbing virulence factor via RANKL-dependent pathway. Therefore, it can be hypothesized that GGT of periodontopathic bacteria may play an important role as a virulence factor in bone destruction. 相似文献
909.
Yong-Joon Jeon Jin Hyun Kim Jong-Il Shin Mini Jeong Jaewook Cho Kyungho Lee 《Molecules and cells》2016,39(2):129-135
Eukaryotic translation initiation factor 2 alpha (eIF2α), which is a component of the eukaryotic translation initiation complex, functions in cell death and survival under various stress conditions. In this study, we investigated the roles of eIF2α phosphorylation in cell death using the breast cancer cell lines MCF-7 and MCF-7/ADR. MCF-7/ADR cells are MCF-7-driven cells that have acquired resistance to doxorubicin (ADR). Treatment of doxorubicin reduced the viability and induced apoptosis in both cell lines, although susceptibility to the drug was very different. Treatment with doxorubicin induced phosphorylation of eIF2α in MCF-7 cells but not in MCF-7/ADR cells. Basal expression levels of Growth Arrest and DNA Damage 34 (GADD34), a regulator of eIF2α, were higher in MCF-7/ADR cells compared to MCF-7 cells. Indeed, treatment with salubrinal, an inhibitor of GADD34, resulted in the upregulation of eIF2α phosphorylation and enhanced doxorubicin-mediated apoptosis in MCF-7/ADR cells. However, MCF-7 cells did not show such synergic effects. These results suggest that dephosphorylation of eIF2α by GADD34 plays an important role in doxorubicin resistance in MCF-7/ADR cells. 相似文献
910.
Hyun‐Bi Kim Dong‐Ho Shin Youn‐Il Park Yong‐Sic Hwang Sang‐Kyu Lee Gynheung An Jong‐Seong Jeon 《植物学报(英文版)》2016,58(2):127-135
We characterized the function of the rice cytosolic hexokinase Os HXK7(Oryza sativa Hexokinase7),which is highly upregulated when seeds germinate under O_2-deficient conditions. According to transient expression assays that used the promoter:luciferase fusion construct,Os HXK7 enhanced the glucose(Glc)-dependent repression of a rice a-amylase gene(RAmy3D) in the mesophyll protoplasts of maize,but its catalytically inactive mutant alleles did not. Consistently,the expression of Os HXK7,but not its catalytically inactive alleles,complemented the Arabidopsis glucose insensitive2-1(gin2-1) mutant,thereby resulting in the wild type characteristics of Glc-dependent repression,seedling development,and plant growth. Interestingly,Os HXK7-mediated Glc-dependent repression was abolished in the O_2-deficient mesophyll protoplasts of maize. This result provides compelling evidence that Os HXK7 functions in sugar signaling via a glycolysis-dependent manner under normal conditions,but its signaling role is suppressed when O_2 is deficient. The germination of two null Os HXK7 mutants,oshxk7-1 and oshxk7-2,was affected by O_2 deficiency,but overexpression enhanced germination in rice. This result suggests the distinct role that OsH XK7 plays in sugar metabolism and efficient germination by enforcing glycolysis-mediated fermentation in O_2-deficient rice. 相似文献