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Journal of Microbiology / the Microbiological Society of Korea

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https://www.readbyqxmd.com/read/28251547/spirosoma-luteolum-sp-nov-isolated-from-water
#1
Jae-Jin Lee, Su-Jin Park, Yeon-Hee Lee, Seung-Yeol Lee, Sangkyu Park, Young-Je Cho, Myung Kyum Kim, Leonid N Ten, Hee-Young Jung
A novel Gram-negative and rod-shaped bacterial strain, designated as 16F6ET, was isolated from a water sample. Cells were yellowish in color and catalase- and oxidase-positive. The strain grew at 10-37°C (optimum at 25°C) but not at 4 and 42°C, and pH 5-7 (optimum at pH 7). It showed moderate resistance to gamma-ray irradiation. Comparative phylogenetic analysis showed that strain 16F6E(T) belonged to the family Cytophagaceae of the class Cytophagia. Furthermore, this isolate showed relatively low 16S rRNA gene sequence similarities (90...
March 13, 2017: Journal of Microbiology / the Microbiological Society of Korea
https://www.readbyqxmd.com/read/28281200/zntr-positively-regulates-t6ss4-expression-in-yersinia-pseudotuberculosis
#2
Tietao Wang, Keqi Chen, Fen Gao, Yiwen Kang, Muhammad Tausif Chaudhry, Zhuo Wang, Yao Wang, Xihui Shen
The type VI secretion system (T6SS) is a widespread and versatile protein secretion system found in most Gramnegative bacteria. Studies of T6SS have mainly focused on its role in virulence toward host cells and inter-bacterial interactions, but studies have also shown that T6SS4 in Yersinia pseudotuberculosis participates in the acquisition of zinc ions to alleviate the accumulation of hydroxyl radicals induced by multiple stressors. Here, by comparing the gene expression patterns of wild-type and zntR mutant Y...
March 10, 2017: Journal of Microbiology / the Microbiological Society of Korea
https://www.readbyqxmd.com/read/28281199/unraveling-new-functions-of-superoxide-dismutase-using-yeast-model-system-beyond-its-conventional-role-in-superoxide-radical-scavenging
#3
REVIEW
Woo-Hyun Chung
To deal with chemically reactive oxygen molecules constantly threatening aerobic life, cells are readily equipped with elaborate biological antioxidant systems. Superoxide dismutase is a metalloenzyme catalytically eliminating superoxide radical as a first-line defense mechanism against oxidative stress. Multiple different SOD isoforms have been developed throughout evolution to play distinct roles in separate subcellular compartments. SOD is not essential for viability of most aerobic organisms and intriguingly found even in strictly anaerobic bacteria...
March 9, 2017: Journal of Microbiology / the Microbiological Society of Korea
https://www.readbyqxmd.com/read/28281198/crystal-structure-of-the-inactive-state-of-the-receiver-domain-of-spo0a-from-paenisporosarcina-sp-tg-14-a-psychrophilic-bacterium-isolated-from-an-antarctic-glacier
#4
Chang Woo Lee, Sun-Ha Park, Sung Gu Lee, Seung Chul Shin, Se Jong Han, Han-Woo Kim, Hyun Ho Park, Sunghwan Kim, Hak Jun Kim, Hyun Park, HaJeung Park, Jun Hyuck Lee
The two-component phosphorelay system is the most prevalent mechanism for sensing and transducing environmental signals in bacteria. Spore formation, which relies on the two-component phosphorelay system, enables the longterm survival of the glacial bacterium Paenisporosarcina sp. TG-14 in the extreme cold environment. Spo0A is a key response regulator of the phosphorelay system in the early stage of spore formation. The protein is composed of a regulatory N-terminal phospho-receiver domain and a DNAbinding C-terminal activator domain...
March 9, 2017: Journal of Microbiology / the Microbiological Society of Korea
https://www.readbyqxmd.com/read/28281197/wild-birds-and-urban-pigeons-as-reservoirs-for-diarrheagenic-escherichia-coli-with-zoonotic-potential
#5
Clarissa A Borges, Marita V Cardozo, Livia G Beraldo, Elisabete S Oliveira, Renato P Maluta, Kaline B Barboza, Karin Werther, Fernando A Ávila
In order to describe the role of wild birds and pigeons in the transmission of shiga toxigenic Escherichia coli (STEC) and enteropathogenic Escherichia coli (EPEC) to humans and other animals, samples were collected from cloacae and oropharynx of free-living wild birds and free-living pigeons. Two STEC (0.8%) and five EPEC strains (2.0%) were isolated from wild birds and four EPEC strains (2.0%) were recovered from pigeons. Serogroups, sequence types (STs) and virulence genes, such as saa, iha, lpfA O113, ehxA, espA, nleB and nleE, detected in this study had already been implicated in human and animal diseases...
March 9, 2017: Journal of Microbiology / the Microbiological Society of Korea
https://www.readbyqxmd.com/read/28251549/the-hyperthermophilic-%C3%AE-amylase-from-thermococcus-sp-hj21-does-not-require-exogenous-calcium-for-thermostability-because-of-high-binding-affinity-to-calcium
#6
Huaixu Cheng, Zhidan Luo, Mingsheng Lu, Song Gao, Shujun Wang
The hyperthermophilic α-amylase from Thermococcus sp. HJ21 does not require exogenous calcium ions for thermostability, and is a promising alternative to commercially available α-amylases to increase the efficiency of industrial processes like the liquefaction of starch. We analyzed the amino acid sequence of this α-amylase by sequence alignments and structural modeling, and found that this α-amylase closely resembles the α-amylase from Pyrococcus woesei. The gene of this α-amylase was cloned in Escherichia coli and the recombinant α-amylase was overexpressed and purified with a combined renaturation-purification procedure...
March 1, 2017: Journal of Microbiology / the Microbiological Society of Korea
https://www.readbyqxmd.com/read/28251548/jindonia-aestuariivivens-gen-nov-sp-nov-isolated-from-a-tidal-flat-on-the-south-western-sea-in-republic-of-korea
#7
Sooyeon Park, Sun Young Yoon, Min-Ji Ha, Jung-Hoon Yoon
A Gram-stain-negative, aerobic, non-flagellated, and coccoid, ovoid or rod-shaped bacterium, designated JDTF-65(T), was isolated from a tidal flat on the south-western sea in Republic of Korea. Strain JDTF-65(T) grew optimally at 25°C, at pH 7.0-8.0 and in the presence of 2.0% (w/v) NaCl. Strain JDTF-65(T) exhibited 16S rRNA gene sequence similarities of 97.1-97.6% to the type strains of 'Aliisedimentitalea scapharcae', Phaeobacter gallaeciensis, Phaeobacter inhibens, Leisingera aquimarina, Tropicibacter litoreus, Sulfitobacter pseudonitzschiae, and Pseudoseohaeicola caenipelagi...
March 1, 2017: Journal of Microbiology / the Microbiological Society of Korea
https://www.readbyqxmd.com/read/28251546/plasmodium-falciparum-apicoplast-and-its-transcriptional-regulation-through-calcium-signaling
#8
REVIEW
Praveen Rai, Drista Sharma, Rani Soni, Nazia Khatoon, Bhaskar Sharma, Tarun Kumar Bhatt
Malaria has been present since ancient time and remains a major global health problem in developing countries. Plasmodium falciparum belongs to the phylum Apicomplexan, largely contain disease-causing parasites and characterized by the presence of apicoplast. It is a very essential organelle of P. falciparum responsible for the synthesis of key molecules required for the growth of the parasite. Indispensable nature of apicoplast makes it a potential drug target. Calcium signaling is important in the establishment of malaria parasite inside the host...
March 1, 2017: Journal of Microbiology / the Microbiological Society of Korea
https://www.readbyqxmd.com/read/28251545/impact-of-tillage-practices-on-soil-bacterial-diversity-and-composition-under-the-tobacco-rice-rotation-in-china
#9
Yanping Lei, Yongliang Xiao, Lifeng Li, Chaoqiang Jiang, Chaolong Zu, Tian Li, Hui Cao
Tobacco-rice rotation is a common farming system in south China, and many tillage practices such as straw mulching, dolomite dust, and quicklime application have been adopted to improve crop production. These agricultural management practices alter soil physical and chemical properties and affect microbial life environment and community composition. In this research, six tillage practices including no tobacco and rice straw mulching (CK), tobacco and rice straw mulching (TrSr), rice straw returning fire (TrSc), tobacco and rice straw mulching with dolomite dust (TSD), rice straw returning fire and quicklime (TSQ), and rice straw returning fire, quicklime and reduced fertilizer (TSQf) were conducted to detect changes in soil bacterial diversity and composition using Illumina sequencing...
March 1, 2017: Journal of Microbiology / the Microbiological Society of Korea
https://www.readbyqxmd.com/read/28127719/fungal-diversity-in-soils-across-a-gradient-of-preserved-brazilian-cerrado
#10
Ademir Sergio Ferreira de Araujo, Walderly Melgaço Bezerra, Vilma Maria Dos Santos, Luis Alfredo Pinheiro Leal Nunes, Maria do Carmo Catanho Pereira de Lyra, Marcia do Vale Barreto Figueiredo, Vania Maria Maciel Melo
The preserved Cerrado from Northeastern Brazil presents different physicochemical properties and plant diversity, which can influence the fungal communities. Therefore, we evaluated the fungal diversity in preserved sites, at Sete Cidades National Park, across a gradient of vegetation that included Campo graminoide, Cerrado stricto sensu, Cerradao, and Floresta decidual. Of all of the operational taxonomic units (OTUs) obtained, the Floresta decidual presented the highest richness. Ascomycota were the most abundant phylum (45%), followed by Basidiomycota (32%)...
January 27, 2017: Journal of Microbiology / the Microbiological Society of Korea
https://www.readbyqxmd.com/read/28124782/azohydromonas-riparia-sp-nov-and-azohydromonas-ureilytica-sp-nov-isolated-from-a-riverside-soil-in-south-korea
#11
Tuan Manh Nguyen, Jaisoo Kim
White and pale yellow coloured bacteria were isolated from the riverside soil, Daejeon, South Korea, and were designated UCM-11(T), UCM-F25, and UCM-80(T). We found that all strains were able to reduce nitrate, and the cells were aerobic and motile. The DNA G+C contents of UCM-11(T), UCM-F25, and UCM-80(T) were between 68.9 to 71.2 mol% and the main ubiquinone was observed as Q-8. Based on16S rRNA gene sequences, strains UCM-11(T) and UCM-F25 were found to closely match with Azohydromonas australica IAM 12664(T) (98...
January 26, 2017: Journal of Microbiology / the Microbiological Society of Korea
https://www.readbyqxmd.com/read/28124781/hymenobacter-daeguensis-sp-nov-isolated-from-river-water
#12
Leonid N Ten, Yeon-Hee Lee, Jae-Jin Lee, Su-Jin Park, Seung-Yeol Lee, Sangkyu Park, DaeSung Lee, In-Kyu Kang, Hee-Young Jung
A Gram-stain-negative, non-motile, non-spore-forming, rodshaped, aerobic bacterial strain, designated 16F3Y-2(T), was isolated from the Han River, South Korea, and was characterized taxonomically using a polyphasic approach. Comparative 16S rRNA gene sequence analysis showed that strain 16F3Y-2(T) belonged to the family Cytophagaceae in the phylum Bacteroidetes and was most closely related to 'Hymenobacter terrae' DG7A (98.01%), H. soli PB17(T) (97.26%), H. glaciei VUG-A130(T) (96.78%), H. antarcticus VUG-A42aa(T) (96...
January 26, 2017: Journal of Microbiology / the Microbiological Society of Korea
https://www.readbyqxmd.com/read/28124780/the-antibacterial-activity-of-e-coli-bacteriophage-lysin-lysep3-is-enhanced-by-fusing-the-bacillus-amyloliquefaciens-bacteriophage-endolysin-binding-domain-d8-to-the-c-terminal-region
#13
Shuang Wang, Jingmin Gu, Meng Lv, Zhimin Guo, Guangmou Yan, Ling Yu, Chongtao Du, Xin Feng, Wenyu Han, Changjiang Sun, Liancheng Lei
Bacteriophage endolysin is one of the most promising antibiotic substitutes, but in Gram-negative bacteria, the outer membrane prevents the lysin from hydrolyzing peptidoglycans and blocks the development of lysin applications. The prime strategy for new antibiotic substitutes is allowing lysin to access the peptidoglycan from outside of the bacteria by reformation of the lysin. In this study, the novel Escherichia coli (E. coli) phage lyase lysep3, which lacks outside-in catalytic ability, was fused with the N-terminal region of the Bacillus amyloliquefaciens lysin including its cell wall binding domain D8 through the best manner of protein fusion based on the predicted tertiary structure of lysep3-D8 to obtain an engineered lysin that can lyse bacteria from the outside...
January 26, 2017: Journal of Microbiology / the Microbiological Society of Korea
https://www.readbyqxmd.com/read/28124779/a-lactic-acid-bacterium-isolated-from-kimchi-ameliorates-intestinal-inflammation-in-dss-induced-colitis
#14
Jin-Soo Park, Inseong Joe, Paul Daong Rhee, Choon-Soo Jeong, Gajin Jeong
Some species of lactic acid bacteria have been shown to be beneficial in inflammatory bowel disease (IBD). In the present study, a strain of lactic acid bacterium (Lactobacillus paracasei LS2) was isolated from the Korean food, kimchi, and was shown to inhibit the development of experimental colitis induced by dextran sulfate sodium (DSS). To investigate the role of LS2 in IBD, mice were fed DSS in drinking water for seven days along with LS2 bacteria which were administered intragastrically to some of the mice, while phosphate- buffered saline (PBS) was administered to others (the controls)...
January 26, 2017: Journal of Microbiology / the Microbiological Society of Korea
https://www.readbyqxmd.com/read/28124778/rapid-maldi-biotyper-based-identification-and-cluster-analysis-of-streptococcus-iniae
#15
Si Won Kim, Seong Won Nho, Se Pyeong Im, Jung Seok Lee, Jae Wook Jung, Jassy Mary S Lazarte, Jaesung Kim, Woo-Jai Lee, Jeong-Ho Lee, Tae Sung Jung
Streptococcus iniae causes severe mortalities among cultured marine species, especially in the olive flounder (Paralichthys olivaceus), which is economically important in Korea and Japan. Recently, there has been growing concern regarding the emergence of S. iniae as a zoonotic pathogen. Here, 89 S. iniae isolates obtained from diseased olive flounders collected from 2003 to 2008 in Jeju Island, South Korea, were characterized using matrix-assisted laser desorption ionization-time of flight mass spectrometry (MALDI-TOF MS)...
January 26, 2017: Journal of Microbiology / the Microbiological Society of Korea
https://www.readbyqxmd.com/read/28124777/minimal-amino-acids-in-the-i-lweq-domain-required-for-anterior-posterior-localization-in-dictyostelium
#16
Hyeseon Kim, Dong-Yeop Shin, Taeck Joong Jeon
Establishment of cell polarity is mediated by a series of signaling molecules that are asymmetrically activated or localized in the cell upon extracellular stimulation. To understand the mechanism that mediates anterior/posterior asymmetric localization of RapGAP3 during migration, we determined the minimally required amino acids in the I/LWEQ domain that cause posterior localization and found that the minimal region of the F-actin binding domain for posterior localization could, with some additional deletion at the C-terminal, localize to the anterior...
January 26, 2017: Journal of Microbiology / the Microbiological Society of Korea
https://www.readbyqxmd.com/read/28124776/colonization-study-of-gfp-tagged-achromobacter-marplatensis-strain-in-sugar-beet
#17
YingWu Shi, Chun Li, HongMei Yang, Tao Zhang, Yan Gao, Min Chu, Jun Zeng, Qing Lin, OuTiKuEr, YuGuo Li, Xiangdong Huo, Kai Lou
This study details the introduction of a gfp marker into an endophytic bacterial strain (Achromobacter marplatensis strain 17, isolated from sugar beet) to monitor its colonization of sugar beet (Beta. vulgaris L.). Stability of the plasmid encoding the gfp was confirmed in vitro for at least 72 h of bacterial growth and after the colonization of tissues, under nonselective conditions. The colonization was observed using fluorescence microscopy and enumeration of culturable endophytes in inoculated sugar beet plants that grew for 10 or 20 days...
January 26, 2017: Journal of Microbiology / the Microbiological Society of Korea
https://www.readbyqxmd.com/read/28124775/antibacterial-compound-produced-by-pseudomonas-aeruginosa-strain-uicc-b-40-an-endophytic-bacterium-isolated-from-neesia-altissima
#18
Rina Hidayati Pratiwi, Iman Hidayat, Muhammad Hanafi, Wibowo Mangunwardoyo
This study's aim was to determine the identity of antibacterial compounds produced by Pseudomonas aeruginosa strain UICC B-40 and describe the antibacterial compounds' mechanisms of action for damaging pathogenic bacteria cells. Isolation and identification of the compounds were carried out using thin layer chromatography (TLC), nuclear magnetic resonance (NMR) spectroscopy and liquid chromatography mass spectrometry (LC-MS) analyses. Antibacterial activity was assayed via minimum inhibitory concentration (MIC) and the antibacterial compound mechanism was observed morphologically through scanning electron microscopy (SEM)...
January 26, 2017: Journal of Microbiology / the Microbiological Society of Korea
https://www.readbyqxmd.com/read/28124774/a-new-record-of-four-penicillium-species-isolated-from-agarum-clathratum-in-korea
#19
Myung Soo Park, Seobihn Lee, Young Woon Lim
Agarum clathratum, brown algae, play important ecological roles in marine ecosystem, but can cause secondary environment pollution when they pile up on the beach. In order to resolve the environment problem by A. clathratum, we focus to isolate and identify Penicillium because many species are well known to produce extracellular enzymes. A total of 32 Penicillium strains were isolated from A. clathratum samples that collected from 13 sites along the mid-east coast of Korea in summer. They were identified based on morphological characters and phylogenetic analysis using β-tubulin DNA sequences as well as a combined dataset of β-tubulin and calmodulin...
January 26, 2017: Journal of Microbiology / the Microbiological Society of Korea
https://www.readbyqxmd.com/read/28124773/alteration-in-the-ultrastructural-morphology-of-mycelial-hyphae-and-the-dynamics-of-transcriptional-activity-of-lytic-enzyme-genes-during-basidiomycete-morphogenesis
#20
Elena Vetchinkina, Maria Kupryashina, Vladimir Gorshkov, Marina Ageeva, Yuri Gogolev, Valentina Nikitina
The morphogenesis of macromycetes is a complex multilevel process resulting in a set of molecular-genetic, physiologicalbiochemical, and morphological-ultrastructural changes in the cells. When the xylotrophic basidiomycetes Lentinus edodes, Grifola frondosa, and Ganoderma lucidum were grown on wood waste as the substrate, the ultrastructural morphology of the mycelial hyphal cell walls differed considerably between mycelium and morphostructures. As the macromycetes passed from vegetative to generative development, the expression of the tyr1, tyr2, chi1, chi2, exg1, exg2, and exg3 genes was activated...
January 26, 2017: Journal of Microbiology / the Microbiological Society of Korea
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