Journal of Microbiology

Kyung Sook Bae

20 Articles

Taxonomic hierarchy of the phylum Firmicutes and novel Firmicutes species originated from various environments in Korea: Chi Nam Seong , Joo Won Kang , Ji Hee Lee , So Yeon Seo , Jung Jae Woo , Chul Park , Kyung Sook Bae , Mi Sun Kim; J. Microbiol. 2018;56(1):1-10. Published online January 4, 2018; DOI: https://doi.org/10.1007/s12275-018-7318-x

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This study assessed the taxonomic hierarchy of the phylum Firmicutes as well as elucidated the isolation and classification states of novel Firmicutes species isolated from Korean territory. The hierarchical classification system of the phylum Firmicutes has been developed since 1872 when the genus Bacillus was first reported and has been generally adopted since 2001. However, this taxonomic hierarchy is still being modified. Until Feb. 2017, the phylum Firmicutes consisted of seven classes (Bacilli, Clostridia, Erysipelotrichia, Limnochordia, Negativicutes, Thermolithobacteria, and Tissierellia), 13 orders, 45 families, and 421 genera. Firmicutes species isolated from various environments in Korea have been reported from 2000, and 187 species have been approved as of Feb. 2017. All Firmicutes species were affiliated with three classes (Bacilli, Clostridia, and Erysipelotrichia), four orders (Bacillales, Lactobacillales, Clostridiales, and Erysipelotrichales), 17 families, and 54 genera. A total of 173 species belong to the class Bacilli, of which 151 species were affiliated with the order Bacillales and the remaining 22 species with the order Lactobacillales. Twelve species belonging to the class Clostridia were affiliated within only one order, Clostridiales. The most abundant family was Bacillaceae (67 species), followed by the family Paenibacillaceae (56 species). Thirteen novel genera were created using isolates from the Korean environment. A number of Firmicutes species were isolated from natural environments in Korean territory. In addition, a considerable number of species were isolated from artificial resources such as fermented foods. Most Firmicutes species, belonging to the families Bacillaceae, Planococcaceae, and Staphylococcaceae, isolated from Korean fermented foods and solar salterns were halophilic or halotolerant. Firmicutes species were isolated from the whole territory of Korea, especially large numbers from Provinces Gyeonggi, Chungnam, and Daejeon.

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Korean indigenous bacterial species with valid names belonging to the phylum Actinobacteria: Kyung Sook Bae , Mi Sun Kim , Ji Hee Lee , Joo Won Kang , Dae In Kim , Ji Hee Lee , Chi Nam Seong; J. Microbiol. 2016;54(12):789-795. Published online November 26, 2016; DOI: https://doi.org/10.1007/s12275-016-6446-4

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To understand the isolation and classification state of actinobacterial species with valid names for Korean indigenous isolates, isolation source, regional origin, and taxonomic affiliation of the isolates were studied. At the time of this writing, the phylum Actinobacteria consisted of only one class, Actinobacteria, including five subclasses, 10 orders, 56 families, and 330 genera. Moreover, new taxa of this phylum continue to be discovered. Korean actinobacterial species with a valid name has been reported from 1995 as Tsukamurella inchonensis isolated from a clinical specimen. In 1997, Streptomyces seoulensis was validated with the isolate from the natural Korean environment. Until Feb. 2016, 256 actinobacterial species with valid names originated from Korean territory were listed on LPSN. The species were affiliated with three subclasses (Acidimicrobidae, Actinobacteridae, and Rubrobacteridae), four orders (Acidimicrobiales, Actinomycetales, Bifidobacteriales, and Solirubrobacterales), 12 suborders, 36 families, and 93 genera. Most of the species belonged to the subclass Actinobacteridae, and almost of the members of this subclass were affiliated with the order Actinomycetales. A number of novel isolates belonged to the families Nocardioidaceae, Microbacteriaceae, Intrasporangiaceae, and Streptomycetaceae as well as the genera Nocardioides, Streptomyces, and Microbacterium. Twenty-six novel genera and one novel family, Motilibacteraceae, were created first with Korean indigenous isolates. Most of the Korean indigenous actionobacterial species were isolated from natural environments such as soil, seawater, tidal flat sediment, and fresh-water. A considerable number of species were isolated from artificial resources such as fermented foods, wastewater, compost, biofilm, and water-cooling systems or clinical specimens. Korean indigenous actinobacterial species were isolated from whole territory of Korea, and especially a large number of species were from Jeju, Gyeonggi, Jeonnam, Daejeon, and Chungnam. A large number of novel actinobacterial species continue to be discovered since the Korean government is encouraging the search for new bacterial species and researchers are endeavoring to find out novel strains from extreme or untapped environments.

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Biocatalytic Properties and Substrate-binding Ability of a Modular GH10 β-1,4-Xylanase from an Insect-symbiotic Bacterium, Streptomyces mexicanus HY-14: Do Young Kim , Dong-Ha Shin , Sora Jung , Jong Suk Lee , Han-Young Cho , Kyung Sook Bae , Chang-Keun Sung , Young Ha Rhee , Kwang-Hee Son , Ho-Yong Park; J. Microbiol. 2014;52(10):863-870. Published online October 1, 2014; DOI: https://doi.org/10.1007/s12275-014-4390-8

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The gene (1350-bp) encoding a modular β-1,4-xylanase (XylU), which consists of an N-terminal catalytic GH10 domain and a C-terminal carbohydrate-binding module 2 (CBM 2), from Streptomyces mexicanus HY-14 was cloned and functionally characterized. The purified His-tagged recombinant enzyme (rXylU, 44.0 kDa) was capable of efficiently hydrolyze diverse xylosidic compounds, p-nitrophenyl-cellobioside, and pnitrophenyl- xylopyranoside when incubated at pH 5.5 and 65°C. Especially, the specific activities (649.8 U/mg and 587.0 U/mg, respectively) of rXylU toward oat spelts xylan and beechwood xylan were relatively higher than those (<500.0 U/mg) of many other GH10 homologs toward the same substrates. The results of enzymatic degradation of birchwood xylan and xylooligosaccharides (xylotriose to xylohexaose) revealed that rXylU preferentially hydrolyzed the substrates to xylobiose (>75%) as the primary degradation product. Moreover, a small amount (4%<) of xylose was detected as the degradation product of the evaluated xylosidic substrates, indicating that rXylU was a peculiar GH10 β-1,4- xylanase with substrate specificity, which was different from its retaining homologs. A significant reduction of the binding ability of rXylU caused by deletion of the C-terminal CBM 2 to various insoluble substrates strongly suggested that the additional domain might considerably contribute to the enzyme-substrate interaction.

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Sunxiuqinia dokdonensis sp. nov., Isolated from Deep Sub-Seafloor Sediment: Dong-Ho Chang , Jae-Bong Lee , Geun-Hye Lee , Moon-Soo Rhee , Haewon Lee , Kyung Sook Bae , Doo-Sang Park , Byoung-Chan Kim; J. Microbiol. 2013;51(6):741-746. Published online December 19, 2013; DOI: https://doi.org/10.1007/s12275-013-3492-z

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A novel facultatively anaerobic strain DH1T was isolated from deep sub-seafloor sediment at a depth of 900 m below the seafloor off Seo-do (the west part of Dokdo Island) in the East Sea of the Republic of Korea. The new strain was characterized using polyphasic approaches. The isolate was Gram-stain-negative, motile by gliding, non-spore-forming rods, oxidase-negative, and catalase-positive; and formed colonies of orange-red color. The NaCl range for growth was 0.5–7.0% (w/v) and no growth was observed in the absence of NaCl. The isolate grew optimally at 30°C, with 2% (w/v) NaCl and at pH 7. The cell-wall hydrolysates contained ribose as a major sugar. The DNA G+C content was 40.8 mol%. The closest related strains are Sunxiuqinia faeciviva JAM-BA0302T and Sunxiuqinia elliptica DQHS-4T (97.9 and 96.3% sequence similarity, respectively). The level of DNADNA relatedness between strain DH1T and S. faeciviva JAMBA0302T was around 41% (but only 6% between DH1T and S. elliptica DQHS-4T). The major cellular fatty acids of the isolate were contained iso-C15:0 (25.9%), anteiso-C15:0 (16.7%), and summed feature 9 (comprising C16:0 3-OH and/or unknown fatty acid of dimethylacetal ECL 17.157; 13.2%). The predominant menaquinone was MK-7. On the basis of polyphasic evidence from this study, the isolate was considered to represent a novel species of the genus Sunxiuqinia, for which the name Sunxiuqinia dokdonensis sp. nov. is proposed; the type strain is DH1T (=KCTC 32503T =CGMCC 1.12676T =JCM 19380T).

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Aestuariibaculum scopimerae sp. nov., Isolated from the Globular Ghost Crab, Scopimera globosa: Jae-Bong Lee , Byung-Chun Kim , Hyangmi Kim , Kyung Sook Bae , Jae-Hyeong Yang , Young-Yull Chun , Seong-Joon Park , Doo-Sang Park; J. Microbiol. 2013;51(6):736-740. Published online December 19, 2013; DOI: https://doi.org/10.1007/s12275-013-3499-5

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A Gram-staining-negative, non-motile, catalase- and oxidasepositive bacterium, designated strain I-15T, was isolated from a crab of the Yellow Sea, Korea. On the basis of a 16S rRNA gene sequence analysis, strain I-15T was shown to belong to Bacteroidetes, related to the genus Aestuariibaculum. Sequence similarity between strain I-15T and the only type strain of the genus Aestuariibaculum, Aestuariibaculum suncheonense SC17T, was 96.7%. Strain I-15T grew at 0.5–6.0% (w/v) NaCl, at 10–42°C and at pH 4.5–8.0. It could hydrolyze starch and Tweens 80. Menaquinone-6 was the only respiratory quinone, and summed features 3 (C16:1 ω7c/C16:1 ω6c) (16.4%), iso-C15:0 (15.6%), and iso-C15:1 G (12.6%) were the major cellular fatty acids. The major polar lipids were phosphatidylethanolamine, two unidentified aminolipids and two unidentified lipids. The DNA G+C content was 39.0 mol%. Polyphasic data allowed genotypic and phenotypic distinction of strain I-15T from the only validly published Aestuariibaculum species. Therefore, the organism is considered a novel species of the genus Aestuariibaculum, for which the name Aestuariibaculum scopimerae sp. nov. is proposed. The type strain is I-15T (=KCTC 32459T =JCM 19486T).

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Phycicoccus ochangensis sp. nov., Isolated from Soil of a Potato Cultivation Field: Hyangmi Kim , Hyun-Woo Oh , Doo-Sang Park , Kang Hyun Lee , Sung Uk Kim , Hee-Moon Park , Kyung Sook Bae; J. Microbiol. 2012;50(2):349-353. Published online April 27, 2012; DOI: https://doi.org/10.1007/s12275-012-1206-6

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Two novel, Gram-positive, motile, coccal bacteria, strains L1b-b9T and B5a-b5, were isolated from a potato cultivation field in Ochang, Korea. These isolates grew at 10–45°C, pH 5.0–10.0, and in the presence of 8% (w/v) NaCl. The diagnostic diamino acid in the cell-wall peptidoglycan was mesodiaminopimelic acid. The major menaquinone was MK-8(H4) and the main cellular fatty acids were iso-C14:0, iso-C15:0, and anteiso-C15:0. Polar lipids in strain L1b-b9T consisted of diphosphatidylglycerol, phosphatidylglycerol, phosphatidylinositol, and an unknown glyco-amino lipid. The G+C content of genomic DNA was 73.6 mol%. A phylogenetic analysis based on 16S rRNA gene sequences showed that strains L1b-b9T and B5a-b5 shared 99.36% similarity and formed a robust clade with the type species of the genus Phycicoccus. Strain L1b-b9T is related most closely to Phycicoccus cremeus V2M29T (97.52% 16S rRNA gene sequence similarity). On the basis of phylogenetic characteristics, the name Phycicoccus ochangensis sp. nov. is proposed for strain LIb-b9T (=KCTC 19694T =JCM 17595T).

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Biosynthesis of Poly(3-Hydroxybutyrate-co-3-Hydroxyvalerate) Copolyesters with a High Molar Fraction of 3-Hydroxyvalerate by an Insect-Symbiotic Burkholderia sp. IS-01: Do Young Kim , Doo-Sang Park , Soon Bum Kwon , Moon Gyu Chung , Kyung Sook Bae , Ho-Yong Park , Young Ha Rhee; J. Microbiol. 2009;47(5):651-656. Published online October 24, 2009; DOI: https://doi.org/10.1007/s12275-009-0109-7

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Burkholderia sp. IS-01 capable of biosynthesizing poly(3-hydroxybutyrate-co-3-hydroxyvalerate) [poly(3HB- co-3HV)] copolyesters with a high molar fraction of 3HV was isolated from the gut of the adult longicorn beetle, Moechotypa diphysis. The strain IS-01 was relatively tolerant to high concentrations of levulinic acid and accumulated a poly(13.5 mol% 3HB-co-86.5 mol% 3HV) copolyester when cultivated on a mixture of gluconate (20 g/L) and levulinic acid (12.5 g/L). In this case, the content of the copolyester in the cells was approximately 60.0%. The compositions of the copolyesters were easily regulated by altering the molar ratio of gluconate and levulinic acid in the medium. The organism was found to possess a class I PHA synthase (PhaC) gene (1,881 bp) that encodes a protein with a deduced molecular mass of 68,538 Da that consists of 626 amino acids. The PhaC of this organism was most similar to that of B. cenocepacia PC184 (92% similarity).

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Paenibacillus filicis sp. nov., Isolated from the Rhizosphere of the Fern: Byung-Chun Kim , Mi Na Kim , Kang Hyun Lee , Sun Beom Kwon , Kyung Sook Bae , Kee-Sun Shin; J. Microbiol. 2009;47(5):524-529. Published online October 24, 2009; DOI: https://doi.org/10.1007/s12275-009-0266-8

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A Gram-positive and endospore-forming bacterial strain, designated S4T, was isolated from the rhizosphere of ferns in Daejeon, Republic of Korea. This isolate is strictly aerobic, motile, and rod-like in shape, and it is positive for catalase, oxidase, esterase lipase, and β-galactosidase activities. In addition, this strain grows when cultured at temperatures between 15 and 37°C and at pH values ranging from 5.5 to 9.0. The DNA G+C content was determined to be 53.2 mol%. Strain S4T has meso-diaminopimelic acid in the cell-wall peptidoglycan; it also contains menaquinone 7 (MK-7) as the predominant isoprenoid quinone and anteiso-C15:0 (57.5%), iso-C16:0 (11.3%), and C16:0 (9.4%) as the major cellular fatty acids. Phylogenetic analysis based on alignments of the 16S rRNA gene sequence showed that S4T is affiliated with a cluster of strains within the genus Paenibacillaceae and is most closely related to Paenibacillus chinjuensis WN9T, with 96.8% similarity. Based on the phylogenetic and phenotypic characteristics of strain S4T, we believe that this isolate should be distinguished from all type species of the genus Paenibacillus and should thus represent a novel taxon within the genus Paenibacillus. We propose naming this type species Paenibacillus filicis sp. nov. for the rhizosphere isolate; the type strain will be known as S4T (=KCTC 13693T =KACC 14197T =JCM 16417T).

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Jae-Hyung Ahn, Byoung-chan Kim, Byung-Yong Kim, Soo-Jin Kim, Jaekyeong Song, Soon-Wo Kwon, Hang-Yeon Weon
Journal of Microbiology.2014; 52(6): 460. CrossRef
Paenibacillus vulneris sp. nov., isolated from a necrotic wound
Stefanie P. Glaeser, Enevold Falsen, Hans-Jürgen Busse, Peter Kämpfer
International Journal of Systematic and Evolutionary Microbiology .2013; 63(Pt_2): 777. CrossRef
Identification and Characterization of Psychrotolerant Sporeformers Associated with Fluid Milk Production and Processing
Reid A. Ivy, Matthew L. Ranieri, Nicole H. Martin, Henk C. den Bakker, Bruno M. Xavier, Martin Wiedmann, Kathryn J. Boor
Applied and Environmental Microbiology.2012; 78(6): 1853. CrossRef
List of new names and new combinations previously effectively, but not validly, published

International Journal of Systematic and Evolutionary Microbiology .2010; 60(1): 1. CrossRef
Paenibacillus pini sp. nov., a cellulolytic bacterium isolated from the rhizosphere of pine tree
Byung-Chun Kim, Kang Hyun Lee, Mi Na Kim, Eun-Mi Kim, Sung Ran Min, Hyun Soon Kim, Kee-Sun Shin
The Journal of Microbiology.2009; 47(6): 699. CrossRef

Diversity of Bacterial Community in Freshwater of Woopo Wetland: Keun Sik Baik , Seong Chan Park , Eun Mi Kim , Kyung Sook Bae , Jae-Hyung Ahn , Jong-Ok Ka , Jongsik Chun , Chi Nam Seong; J. Microbiol. 2008;46(6):647-655. Published online December 24, 2008; DOI: https://doi.org/10.1007/s12275-008-0135-x

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Diversity of bacterial community in water layer of Woopo wetland was investigated. Cultivable bacterial strains were isolated by the standard dilution plating technique and culture-independent 16S rRNA gene clones were obtained directly from DNA extracts of a water sample. Amplified rDNA restriction analysis (ARDRA) was applied onto both of the isolates and 16S rRNA gene clones. Rarefaction curves, coverage rate and diversity indices of ARDRA patterns were calculated. Representative isolates and clones of all the single isolate/clone phylotype were partially sequenced and analyzed phylogenetically. Sixty-four and 125 phylotypes were obtained from 203 bacterial isolates and 235 culture-independent 16S rRNA gene clones, respectively. Bacterial isolates were composed of 4 phyla, of which Firmicutes (49.8%) and Actinobacteria (32.0%) were predominant. Isolates were affiliated with 58 species. Culture-independent 16S rRNA gene clones were composed of 8 phyla, of which Proteobacteria (62.2%), Actinobacteria (15.5%), and Bacteroidetes (13.7%) were predominant. Diversity of 16S rRNA gene clones originated from cultivation-independent DNA extracts was higher than that of isolated bacteria.

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Paenibacillus camelliae sp. nov., Isolated from Fermented Leaves of Camellia sinensis: Hyun-Woo Oh , Byung-Chun Kim , Kang Hyun Lee , Do Young Kim , Doo-Sang Park , Hee-Moon Park , Kyung Sook Bae; J. Microbiol. 2008;46(5):530-534. Published online October 31, 2008; DOI: https://doi.org/10.1007/s12275-008-0233-9

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A novel bacterium, strain b11s-2T was isolated from Pu’er tea. The isolate was Gram-positive, endosporeforming motile rod that grew at 15~42°C and pH 6.0~10.2. The DNA G+C content was 48.3 mol%, the predominant isoprenoid quinone was MK-7, and the predominant cellular fatty acid was anteiso-C15:0 (54.2%) followed by C16:0 (15.5%) and iso-C16:0 (8.2%). The polar lipid pattern of b11s-2T was characterized by the presence of diphosphatidylglycerol, phosphatidylethanolamine, and phosphatidylglycerol. Phylogenetic analysis based on 16S rRNA gene sequence showed that the strain was affiliated within the Paenibacillaceae. The strain was most closely related to Paenibacillus granivorans A30T, with a similarity of 97.1%. Based on the phylogenetic and phenotypic characteristics of strain b11s-2T, the isolate is thought to represent a novel taxon in the genus Paenibacillus. The name Paenibacillus camelliae sp. nov. is proposed for the fermented tea isolate; the type strain is b11s-2T (= KCTC 13220T= CECT 7361T).

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Characterization of an Extracellular Lipase in Burkholderia sp. HY-10 Isolated from a Longicorn Beetle: Doo-Sang Park , Hyun-Woo Oh , Sun-Yeon Heo , Woo-Jin Jeong , Dong Ha Shin , Kyung Sook Bae , Ho-Young Park; J. Microbiol. 2007;45(5):409-417.; DOI: https://doi.org/2596 [pii]

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Abstract PDF: Burkholderia sp. HY-10 isolated from the digestive tracts of the longicorn beetle, Prionus insularis, produced an extracellular lipase with a molecular weight of 33.5 kDa estimated by SDS-PAGE. The lipase was purified from the culture supernatant to near electrophoretic homogenity by a one-step adsorption-desorption procedure using a polypropylene matrix followed by a concentration step. The purified lipase exhibited highest activities at pH 8.5 and 60°C. A broad range of lipase substrates, from C4 to C18 ρ-nitrophenyl esters, were hydrolyzed efficiently by the lipase. The most efficient substrate was ρ-nitrophenyl caproate (C6). A 2485 bp DNA fragment was isolated by PCR amplification and chromosomal walking which encoded two polypeptides of 364 and 346 amino acids, identified as a lipase and a lipase foldase, respectively. The N-terminal amino acid sequence of the purified lipase and nucleotide sequence analysis predicted that the precursor lipase was proteolytically modified through the secretion step and produced a catalytically active 33.5 kDa protein. The deduced amino acid sequence for the lipase shared extensive similarity with those of the lipase family I.2 of lipases from other bacteria. The deduced amino acid sequence contained two Cystein residues forming a disulfide bond in the molecule and three, well-conserved amino acid residues, Ser131, His330, and Asp308, which composed the catalytic triad of the enzyme.

A Culture-Based Study of the Bacterial Communities within the Guts of Nine Longicorn Beetle Species and their Exo-enzyme Producing Properties for Degrading Xylan and Pectin: Doo-Sang Park , Hyun-Woo Oh , Won-Jin Jeong , Hyangmi Kim , Ho-Yong Park , Kyung Sook Bae; J. Microbiol. 2007;45(5):394-401.; DOI: https://doi.org/2598 [pii]

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Abstract PDF: In this study, bacterial communities within the guts of several longicorn beetles were investigated by a culture-dependent method. A total of 142 bacterial strains were isolated from nine species of longicorn beetle, including adults and larvae. A comparison of their partial 16S rRNA gene sequences showed that most of the bacteria constituting the gut communities can typically be found in soil, plants and the intestines of animals, and approximately 10% were proposed as unreported. Phylogenetic analysis demonstrated that the bacterial species comprised 7 phyla, and approximately half were Gammaproteobacteria. Actinobacteria were the second most populous group (19%), followed by Firmicutes (13%) and Alphaproteobacteria (11%). Betaproteobacteria, Flavobacteria, and Acidobacteria were minor constituents. The taxonomic compositions of the isolates were variable according to the species of longicorn beetle. Particularly, an abundance of Actinobacteria existed in Moechotypa diphysis and Mesosa hirsute, which eat broadleaf trees; however, no Actinobacteria were isolated from Corymbia rubra and Monochamus alternatus, which are needle-leaf eaters. Considerable proportions of xylanase and pectinase producing bacteria in the guts of the longicorn beetles implied that the bacteria may play an important role in the digestion of woody diets. Actinobacteria and Gammaproteobacteria were the dominant xylanase producers in the guts of the beetles.

Diversity of Yeasts Associated with Panax ginseng: Soon Gyu Hong , Kang Hyun Lee , Jangyul Kwak , Kyung Sook Bae; J. Microbiol. 2006;44(6):674-679.; DOI: https://doi.org/2457 [pii]

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Abstract PDF: Biodiversity of yeasts was investigated in the ginseng cultivation field. Among 34 isolates tested in this study, 26 isolates belonged to the hymenomycetous yeast group. These 26 strains were classified into 12 species including four new-species candidates that did not have clear affiliation to any established species. Seven isolates among the remaining strains were classified into three ascomycetous yeast species, and one isolate was identified as a urediniomycetous yeast species.

Isolation and Characterization of Bacteria Associated with Two Sand Dune Plant Species, Calystegia soldanella and Elymus mollis: Myung Soo Park , Se Ra Jung , Myoung Sook Lee , Kyoung Ok Kim , Jin Ok Do , Kang Hyun Lee , Seung Bum Kim , Kyung Sook Bae; J. Microbiol. 2005;43(3):219-227.; DOI: https://doi.org/2223 [pii]

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Abstract PDF: Little is known about the bacterial communities associated with the plants inhabiting sand dune ecosystems. In this study, the bacterial populations associated with two major sand dune plant species, Calystegia soldanella (beach morning glory) and Elymus mollis (wild rye), growing along the costal areas in Tae-An, Chungnam Province, were analyzed using a culture-dependent approach. A total of 212 bacteria were isolated from the root and rhizosphere samples of the two plants, and subjected to further analysis. Based on the analysis of the 16S rDNA sequences, all the bacterial isolates were classified into six major phyla of the domain Bacteria. Significant differences were observed between the two plant species, and also between the rhizospheric and root endophytic communities. The isolates from the rhizosphere of the two plant species were assigned to 27 different established genera, and the root endophytic bacteria were assigned to 21. Members of the phylum Gammaproteobacteria, notably the Pseudomonas species, comprised the majority of both the rhizospheric and endophytic bacteria, followed by members of Bacteroidetes and Firmicutes in the rhizosphere and Alphaproteobacteria and Bacteroidetes in the root. A number of isolates were recognized as potentially novel bacterial taxa. Fifteen out of 27 bacterial genera were commonly found in the rhizosphere of both plants, which was comparable to 3 out of 21 common genera in the root, implying the host specificity for endophytic populations. This study of the diversity of culturable rhizospheric and endophytic bacteria has provided the basis for further investigation aimed at the selection of microbes for the facilitation of plant growth.

Inferring the Molecular Phylogeny of Chroococcalian Strains (Blue-green algae/Cyanophyta) from the Geumgang River, Based on Partial Sequences of 16S rRNA Gene: Wook Jae Lee , Kyung Sook Bae; J. Microbiol. 2002;40(4):335-339.

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Abstract PDF: Partial sequences of 16S rRNA gene of five chroococcalian blue-green algal strains, Aphanothece nidulans KCTC AG10041, Aphanothece naegelii KCTC AG10042, Microcystis aeruginosa KCTC AG10159, Microcystis ichthyoblabe KCTC AG10160, and Microcystis viridis KCTC AG10198, which were isolated from water from the Geumgang River, were determined and were inferred their phylogenetic and taxonomic positions among taxa of order Chroococcales. Most taxa of Chroococcales whose partial 16S rRNA gene sequences were aligned in this study, are clustered with other related taxa. Aphanothece nidulans KCTC AG10041 and Aphanothece naegelii KCTC AG10042 made a cluster with other European species of these genera, which supported 100% of the bootstrap trees with a very high sequence similarity (97.4-99.4%) in this study. Three strains, Microcystis aeruginosa KCTC AG10159, M. ichthyoblabe KCTC AG10160, and M. viridis KCTC AG10198, formed a cluster with other Microcystis spp. supported 100 % of the bootstrap trees with a similarity of 97.0-99.9% except for two strains. However, this phylogentic tree made no resolution among the species of Microcystis spp. The topology of the tree reconfirmed the taxonomic status of three species of Microcystis, identified in this study based on the morphology, as three colonial types of Microcystis aeruginosa com. nov. Otsuka et al. (1999c). The genera of chroococcalian cyanophytes are heterogeneously clustered in these sequence analyses. We suggest that more molecular studies on the genera of Chroococcales with reference strains, widely collected from restricted geographic or environmental ranges, get accurate taxonomic or phylogenetic determinations.

Transformations of 2,4,6-Trinitrotoluene in Various Conditions by Klebsiella sp. Strain C1 Isolated from Activated Sludge: Chong-Suk Chang , Hyoun-Young Kim , Yang-Mi Kang , Kyung Sook Bae , Hong-Gyu Song; J. Microbiol. 2002;40(3):193-198.

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Abstract PDF: Several 2,4,6-Trinitrotoluene (TNT) degrading bacteria were isolated from an activated sludge by an enrichment culture technique, and their TNT removal activities were examined. Among the isolates, strain C1 showed the highest degrading capability, and completely removed 100 or 200 mg l^-1 of TNT within 6 hours of incubation. This bacterium was identified as Klebsiella sp. The effects of different carbon sources on the removal of the parent TNT by Klebsiella sp. C1 were negligible, but the transformation rates of TNT metabolites such as amino-dinitrotoluenes and diamino-nitrotoluenes were higher with fructose addition compared to glucose addition. When nitrate was used as the nitrogen source, the degradation rates of TNT and hydroxylamino-dinitrotoluenes were higher than those with the ammonium addition. Although the TNT removal rate of Klebsiella sp. C1 was slightly higher in anaerobic conditions, the further transformations of TNT metabolites were more favorable in aerobic conditions.

Purification and Characterization of Poly(3-hydroxybutyrate) Depolymerase from a Fungal Isolate, Emericellopsis minima W2: Do Young Kim , Ji Hye Yun , Hyung Woo Kim , Kyung Sook Bae , Young Ha Rhee; J. Microbiol. 2002;40(2):129-133.

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Abstract PDF: The fungus, Emericellopsis minima W2, capable of degrading poly(3-hydroxybutyrate) (PHB) was isolated from a waste water sample. Production of the PHB depolymerase from E. minima W2 (PhaZ_Emi ) was significantly repressed in the presence of glucose. PhaZ_Emi was purified by column chromatography on Octyl-Sepharose CL-4B and Sephadex G-100. The molecular mass of the PhaZ_Emi , which consisted of a single polypeptide chain, was estimated to be 48.0 kDa by SDS-PAGE and its pI value was 4.4. The maximum activity of the PhaZ_Emi was observed at pH 9.0 and 55 C. It was significantly inactivated by 1 mM dithiothreitol, 2 mM diisopropyl fluorophosphate, 0.1 mM Tween 80, and 0.1 mM Triton X-100, but insensitive to phenylmethylsulfonyl fluoride and N-ethylmaleimide. The PhaZ_Emi efficiently hydrolyzed PHB and its copolyester with 30 mol% 3-hydroxyvalerate, but did not act on poly(3-hydroxyoctanoate). It also hydrolyzed p-nitrophenylacetate and p-nitrophenylbutyrate but hardly affected the longer-chain forms. The main hydrolysis product of PHB was identified as a dimer of 3-hydroxybutyrate.

Diversity of Yeasts Associated with Natural Environments in Korea: Soon Gyu Hong , Kang Hyun Lee , Kyung Sook Bae; J. Microbiol. 2002;40(1):55-62.

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Abstract PDF: Biodiversity of yeasts in various natural environments including soils, swamps and plants was investigated. By molecular identification methods based on the partial sequences of 26S rDNA, 69 isolates were assigned to 44 taxa including 27 known species. The remaining 17 taxa could potentially form new species. All of them were classified into Ascomycota, Hymenomycetes, Urediniomycetes and Ustilaginomycetes. Ascomycetous and ustilaginomycetous yeasts were generally isolated from flower samples, and hymenomycetous and urediniomycetous yeasts were generally isolated from soil samples. Distribution of yeast groups exhibited geographical variation. Yeast biodiversity of root soil also varied according to the associated plant species.

Genomic Organization of Penicillium chrysogenum chs4, a Class III Chitin Synthase Gene: Yoon-Dong Park , Myung-Sook Lee , Ji-Hoon Kim , Jun Namgung , Bum Chan Park , Kyung Sook Bae , Hee-Moon Park; J. Microbiol. 2000;38(4):230-238.

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Abstract PDF: Class III chitin synthases in filamentous fungi are important for hyphal growth and differentiation of several filamentous fungi. A genomic clone containing the full gene encoding Chs4, a class III chitin synthase in Penicillium chrysogenum, was cloned by PCR screening and colony hybridization from the genomic library. Nucleotide sequence analysis and transcript mapping of chs4 revealed an open reading frame (ORF) that consisted of 5 exons and 4 introns and encoded a putative protein of 915 amino acids. Nucleotide sequence analysis of the 5?lanking region of the ORF revealed a potential TATA box and several binding sites for transcription activators. The putative transcription initiation site at ?6 position was identified by primer extension and the expression of the chs4 during the vegetative growth was confirmed by Northern blot analysis. Amino acid sequence analysis of the Chs4 revealed at least 5 transmembrane helices and several sites for post-translational modifications. Comparison of the amino acid sequence of Chs4 with those of other fungi showed a close relationship between P. chr ysogenum and genus Aspergillus.

Sequence Comparison of Mitochondrial Small Subunit Ribosomal DNA in Penicillium: Soon Gyu Hong , Yoon-Dong Park , Wonjin Jeong , Kyung Sook Bae; J. Microbiol. 2000;38(2):62-65.

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Abstract PDF: Partial sequence comparisons of mitochondrial small subunit rDNA (mt SSU rDNA) were used to examine taxonomic and evolutionary relationships among seven Penicillium species: two monoverticillate species, two biverticillate species, and three terverticillate species. Amplified fragments of mt SSU rDNA highly varied among seven species in size, suggesting the existence of multiple insertions or deletions in the region. A phylogenetic tree was constructed by exhaustive search of parsimony analysis. The phylogenetic tree distinguished two statistically supported monophyletic groups, one for two monoverticillate species and the other for three terverticillate species and one biverticillate species, P. vulpinum. The phylogenetic relationship of P. waksmanii, the biverticillate species, was not clear.

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