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Gamma-irradiation of Streptococcus pneumoniae for the use as an immunogenic whole cell vaccine
Min Yong Jwa , Soyoung Jeong , Eun Byeol Ko , A Reum Kim , Hyun Young Kim , Sun Kyung Kim , Ho Seong Seo , Cheol-Heui Yun , Seung Hyun Han
J. Microbiol. 2018;56(8):579-585.   Published online July 25, 2018
DOI: https://doi.org/10.1007/s12275-018-8347-1
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AbstractAbstract
Streptococcus pneumoniae is a major respiratory pathogen that causes millions of deaths worldwide. Although subunit vaccines formulated with the capsular polysaccharides or their protein conjugates are currently-available, low-cost vaccines with wide serotype coverage still remain to be developed, especially for developing countries. Recently, gamma- irradiation has been considered as an effective inactivation
method
to prepare S. pneumoniae vaccine candidate. In this study, we investigated the immunogenicity and protective immunity of gamma-irradiated S. pneumoniae (r-SP), by comparing with heat-inactivated S. pneumoniae (h-SP) and formalin-inactivated S. pneumoniae (f-SP), both of which were made by traditional inactivation methods. Intranasal immunization of C57BL/6 mice with r-SP in combination with cholera toxin as an adjuvant enhanced S. pneumoniaespecific antibodies on the airway mucosal surface and in sera more potently than that with h-SP or f-SP under the same conditions. In addition, sera from mice immunized with r- SP potently induced opsonophagocytic killing activity more effectively than those of h-SP or f-SP, implying that r-SP could induce protective antibodies. Above all, immunization with r-SP effectively protected mice against S. pneumoniae infection. Collectively, these results suggest that gamma- irradiation is an effective method for the development of a killed whole cell pneumococcal vaccine that elicits robust mucosal and systemic immune responses.

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    Frontiers in Immunology.2022;[Epub]     CrossRef
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  • Immune Responses to Irradiated Pneumococcal Whole Cell Vaccine
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  • Low-Energy Electron Irradiation Efficiently Inactivates the Gram-Negative Pathogen Rodentibacter pneumotropicus—A New Method for the Generation of Bacterial Vaccines with Increased Efficacy
    Jasmin Fertey, Lea Bayer, Sophie Kähl, Rukiya M. Haji, Anke Burger-Kentischer, Martin Thoma, Bastian Standfest, Jessy Schönfelder, Javier Portillo Casado, Frank-Holm Rögner, Christoph Georg Baums, Thomas Grunwald, Sebastian Ulbert
    Vaccines.2020; 8(1): 113.     CrossRef
  • Next-Generation Whole-Cell Pneumococcal Vaccine
    Victor Morais, Esther Texeira, Norma Suarez
    Vaccines.2019; 7(4): 151.     CrossRef
  • Gamma-irradiation-killed Streptococcus pneumoniae potently induces the expression of IL-6 and IL-8 in human bronchial epithelial cells
    Min Yong Jwa, Eun Byeol Ko, Hyun Young Kim, Sun Kyung Kim, Soyoung Jeong, Ho Seong Seo, Cheol-Heui Yun, Seung Hyun Han
    Microbial Pathogenesis.2018; 124: 38.     CrossRef
Review
Minireview] Microbial radiation-resistance mechanisms
Kwang-Woo Jung , Sangyong Lim , Yong-Sun Bahn
J. Microbiol. 2017;55(7):499-507.   Published online June 30, 2017
DOI: https://doi.org/10.1007/s12275-017-7242-5
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AbstractAbstract
Organisms living in extreme environments have evolved a wide range of survival strategies by changing biochemical and physiological features depending on their biological niches. Interestingly, organisms exhibiting high radiation resistance have been discovered in the three domains of life (Bacteria, Archaea, and Eukarya), even though a naturally radiationintensive environment has not been found. To counteract the deleterious effects caused by radiation exposure, radiation- resistant organisms employ a series of defensive systems, such as changes in intracellular cation concentration, excellent DNA repair systems, and efficient enzymatic and non-enzymatic antioxidant systems. Here, we overview past and recent findings about radiation-resistance mechanisms in the three domains of life for potential usage of such radiationresistant microbes in the biotechnology industry.

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Journal Articles
Deinococcus sedimenti sp. nov. isolated from river sediment
Jae-Jin Lee , Yeon-Hee Lee , Su-Jin Park , Sangyong Lim , Sun-Wook Jeong , Seung-Yeol Lee , Sangkyu Park , Hyo-Won Choi , Myung Kyum Kim , Hee-Young Jung
J. Microbiol. 2016;54(12):802-808.   Published online November 26, 2016
DOI: https://doi.org/10.1007/s12275-016-6361-8
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AbstractAbstract
A novel Gram-positive, oval-shaped, non-motile bacterium designated strain 16F1LT was isolated from sediment collected from the Han River in Seoul, Republic of Korea. Based on the 16S rRNA gene sequence (1,448 bp), this strain was identified as a member of the genus Deinococcus that belongs to the class Deinococci. Similarities in the 16S rRNA gene sequence were shown with Deinococcus daejeonensis MJ27T (99.0%), D. grandis DSM 3963T (98.1%), D. radiotolerans C1T (97.5%), and D. caeni Ho-08T (97.2%). Strain 16F1LT was classified as a different genomic species from closely related Deinococcus members, based on less than 70% DNA-DNA relatedness. Genomic DNA G+C content of strain 16F1LT was 67.2 mol%. Strain 16F1LT was found to grow at temperatures of 10–37°C (optimum 25°C) and pH 7–8 (optimum pH 7) on R2A medium, and was catalase-positive and oxidase-negative. Strain 16F1LT showed resistance to gamma radiation (D10 > 2 kGy). In addition, this strain had the following chemotaxonomic characteristics: the major fatty acids were C15:1 ω6c and C16:1 ω7c; the polar lipid profile contained phosphoglycolipids, unknown aminophospholipids, an unknown aminoglycolipid, unknown aminolipids, an unknown glycolipid, an unknown phospholipid, and an unknown polar lipid; the major quinone was MK-8. Phylogenetic, genotypic, phenotypic, and chemotaxonomic characteristics indicated that strain 16F1LT represents a novel species within the genus Deinococcus, for which the name Deinococcus sedimenti sp. nov. is proposed. The type strain is 16F1LT (=KCTC 33796T =JCM 31405T).

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Deinococcus seoulensis sp. nov., a bacterium isolated from sediment at Han River in Seoul, Republic of Korea
Jae-Jin Lee , Yeon-Hee Lee , Su-Jin Park , Sangyong Lim , Sun-Wook Jeong , Seung-Yeol Lee , Young-Je Cho , Myung Kyum Kim , Hee-Young Jung
J. Microbiol. 2016;54(8):537-542.   Published online August 2, 2016
DOI: https://doi.org/10.1007/s12275-016-6253-y
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AbstractAbstract
Strain 16F1ET was isolated from a 3-kGy-irradiated sediment sample collected at Han River in Seoul, Republic of Korea. Cells of this strain were observed to be Gram-positive, pililike structure, and short rod shape, and colonies were red in color. The strain showed the highest degree of 16S rRNA gene sequence similarity to Deinococcus aquaticus PB314T (98.8%), Deinococcus depolymerans TDMA-24T (98.1%), Deinococcus caeni Ho-08T (98.0%), and Deinococcus grandis DSM 3963T (97.0%). 16S rRNA gene sequence analysis identified this strain as a member of the genus Deinococcus (Family: Deinococcaceae). The genomic DNA G+C content of strain 16F1ET was 66.9 mol%. The low levels of DNA-DNA hybridization (< 56.2%) with the species mentioned above identified strain 16F1ET as a novel Deinococcus species. Its oxidase and catalase activities as well as the production of acid from glucose were positive. Growth of the strain was observed at 10–37°C (optimum: 20–30°C) and pH 4–10 (optimum: pH 7–8). The cells tolerated less than 5% NaCl and had low resistance to gamma radiation (D10 < 4 kGy). Strain 16F1ET possessed the following chemotaxonomic characteristics: C16:0, C15:1 ω6c, and C16:1 ω7c as the major fatty acids; phosphoglycolipid as the predominant polar lipid; and menaquinone-8 as the predominant respiratory isoprenoid quinone. Based on the polyphasic evidence, as well as the phylogenetic, genotypic, phenotypic, and chemotaxonomic characterization results, strain 16F1ET (=KCTC 33793T =JCM 31404T) is proposed to represent the type strain of a novel species, Deinococcus seoulensis sp. nov.

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Research Support, Non-U.S. Gov'ts
Spirosoma montaniterrae sp. nov., an ultraviolet and gamma radiation-resistant bacterium isolated from mountain soil
Jae-Jin Lee , Myung-Suk Kang , Eun Sun Joo , Myung Kyum Kim , Wan-Taek Im , Hee-Young Jung , Sathiyaraj Srinivasan
J. Microbiol. 2015;53(7):429-434.   Published online June 27, 2015
DOI: https://doi.org/10.1007/s12275-015-5008-5
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AbstractAbstract
A Gram-negative, yellow-pigmented, long-rod shaped bacterial strain designated DY10T was isolated from a soil sample collected at Mt. Deogyusan, Jeonbuk province, South Korea. Optimum growth observed at 30°C and pH 7. No growth was observed above 1% (w/v) NaCl. Comparative 16S rRNA gene sequence analysis showed that strain DY10T belonged to the genus Spirosoma and was distantly related to Spirosoma arcticum R2-35T (91.0%), Spirosoma lingual DSM 74T (90.8%), Spirosoma endophyticum EX36T (90.7%), Spirosoma panaciterrae DSM 21099T (90.5%), Spirosoma rigui WPCB118T (90.2%), Spirosoma spitsbergense DSM 19989T (89.8%), Spirosoma luteum DSM 19990T (89.6%), Spirosoma oryzae RHs22T (89.6%), and Spirosoma radiotolerans DG5AT (89.1%). Strain DY10T showed resistance to gamma and ultraviolet radiation. The chemotaxonomic characteristics of strain DY10T were consistent with those of the genus Spirosoma, with the quinone system with MK-7 as the predominant menaquinone, iso-C15:0, C16:1 ω5c, and summed feature3 (C16:1 ω7c/C16:1 ω6c), and phosphatidylethanolamine as the major polar lipid. The G+C content of the genomic DNA was 53.0 mol%. Differential phenotypic properties with the closely related type strains clearly distinguished strain DY10T from previously described members of the genus Spirosoma and represents a novel species in this genus, for which the name Spirosoma montaniterrae sp. nov. is proposed. The type strain is DY10T (=KCTC 23999T =KEMB 9004-162T =JCM 18492T).

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Saccharomyces cerevisiae Cmr1 Protein Preferentially Binds to UV-Damaged DNA In Vitro
Do-Hee Choi , Sung-Hun Kwon , Joon-Ho Kim , Sung-Ho Bae
J. Microbiol. 2012;50(1):112-118.   Published online February 27, 2012
DOI: https://doi.org/10.1007/s12275-012-1597-4
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AbstractAbstract
DNA metabolic processes such as DNA replication, recombination, and repair are fundamentally important for the maintenance of genome integrity and cell viability. Although a large number of proteins involved in these pathways have been extensively studied, many proteins still remain to be identified. In this study, we isolated DNA-binding proteins from Saccharomyces cerevisiae using DNA-cellulose columns. By analyzing the proteins using mass spectrometry, an uncharacterized protein, Cmr1/YDL156W, was identified. Cmr1 showed sequence homology to human Damaged-DNA binding protein 2 in its C-terminal WD40 repeats. Consistent with this finding, the purified recombinant Cmr1 protein was found to be intrinsically associated with DNA-binding activity and exhibited higher affinity to UV-damaged DNA substrates. Chromatin isolation experiments revealed that Cmr1 localized in both the chromatin and supernatant fractions, and the level of Cmr1 in the chromatin fraction increased when yeast cells were irradiated with UV. These
results
suggest that Cmr1 may be involved in DNA-damage responses in yeast.
Mutation Spectrum of Manganese (II) Peroxidase Gene in the Pleurotusostreatus Mutants Induced by Gamma Radiation
Hwa-Hyoung Chang^ , Young-Keun Lee^ , Jae-Sung Kim^ , Ki-Sung Lee^ , Kyu Seong Cho^
J. Microbiol. 2003;41(1):52-57.
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AbstractAbstract
The mutational spectra in the manganese (II) peroxidase gene (mnp) of the Pleurotus ostreatus mutants induced by gamma radiation (Co^60) give evidence to prove the effect of gamma radiation on the gene. mnp of each mutant was cloned, sequenced and analyzed. Among the 1941 base pairs of the sequenced region of the mnp genes of 4 mutants (PO-5, -6, -15 and -16), nine mutational hotspots on which the same base was mutated simultaneously were found, additionally 6 mutations were also found at different positions in the mnp gene. These mutation-spectra were predominantly A:T_G:C transitions (50.1%). By the analysis of putative amino acid sequences, PO-5 and PO-16 mutants have 3 and 1 mutated residues, respectively. Since the mutational spectra reported herein are specific to the mnp gene, we propose that the mutational hotspots for the gamma radiation could be in the gene(s) within cells.

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