Journal of Microbiology

Review

Structural Insights into the Lipopolysaccharide Transport (Lpt) System as a Novel Antibiotic Target: Yurim Yoon, Saemee Song; J. Microbiol. 2024;62(4):261-275. Published online May 31, 2024; DOI: https://doi.org/10.1007/s12275-024-00137-w

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Abstract: Lipopolysaccharide (LPS) is a critical component of the extracellular leaflet within the bacterial outer membrane, forming an effective physical barrier against environmental threats in Gram-negative bacteria. After LPS is synthesized and matured in the bacterial cytoplasm and the inner membrane (IM), LPS is inserted into the outer membrane (OM) through the ATP-driven LPS transport (Lpt) pathway, which is an energy-intensive process. A trans-envelope complex that contains seven Lpt proteins (LptA-LptG) is crucial for extracting LPS from the IM and transporting it across the periplasm to the OM. The last step in LPS transport involves the mediation of the LptDE complex, facilitating the insertion of LPS into the outer leaflet of the OM. As the Lpt system plays an essential role in maintaining the impermeability of the OM via LPS decoration, the interactions between these interconnected subunits, which are meticulously regulated, may be potential targets for the development of new antibiotics to combat multidrug-resistant Gram-negative bacteria. In this review, we aimed to provide an overview of current research concerning the structural interactions within the Lpt system and their implications to clarify the function and regulation of LPS transport in the overall process of OM biogenesis. Additionally, we explored studies on the development of therapeutic inhibitors of LPS transport, the factors that limit success, and future prospects.

Journal Articles

[Protocol] Development of DNA aptamers specific for small therapeutic peptides using a modified SELEX method: Jaemin Lee , Minkyung Ryu , Dayeong Bae , Hong-Man Kim , Seong-il Eyun , Jeehyeon Bae , Kangseok Lee; J. Microbiol. 2022;60(7):659-667. Published online June 22, 2022; DOI: https://doi.org/10.1007/s12275-022-2235-4

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Aptamers are short single-stranded DNA or RNA oligonucleotides capable of binding with high affinity and specificity to target molecules. Because of their durability and ease of synthesis, aptamers are used in a wide range of biomedical fields, including the diagnosis of diseases and targeted delivery of therapeutic agents. The aptamers were selected using a process called systematic evolution of ligands by exponential enrichment (SELEX), which has been improved for various research purposes since its development in 1990. In this protocol, we describe a modified SELEX method that rapidly produces high aptamer screening yields using two types of magnetic beads. Using this method, we isolated an aptamer that specifically binds to an antimicrobial peptide. We suggest that by conjugating a small therapeutic-specific aptamer to a gold nanoparticle-based delivery system, which enhances the stability and intracellular delivery of peptides, aptamers selected by our method can be used for the development of therapeutic agents utilizing small therapeutic peptides.

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Recent approaches in the application of antimicrobial peptides in food preservation
Satparkash Singh, Bhavna Jha, Pratiksha Tiwari, Vinay G. Joshi, Adarsh Mishra, Yashpal Singh Malik
World Journal of Microbiology and Biotechnology.2024;[Epub] CrossRef
Design and application of microfluidics in aptamer SELEX and Aptasensors
Shikun Zhang, Yingming Zhang, Zhiyuan Ning, Mengxia Duan, Xianfeng Lin, Nuo Duan, Zhouping Wang, Shijia Wu
Biotechnology Advances.2024; 77: 108461. CrossRef
Nanogenosensors based on aptamers and peptides for bioelectrochemical cancer detection: an overview of recent advances in emerging materials and technologies
Babak Mikaeeli Kangarshahi, Seyed Morteza Naghib
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Recent progress of SELEX methods for screening nucleic acid aptamers
Chao Zhu, Ziru Feng, Hongwei Qin, Lu Chen, Mengmeng Yan, Linsen Li, Feng Qu
Talanta.2024; 266: 124998. CrossRef
Aptamer-conjugated gold nanoparticles platform as the intracellular delivery of antibodies for cancer therapy
Ji-Hyun Yeom, Eunkyoung Shin, Hanyong Jin, Haifeng Liu, Yongyang Luo, Youngwoo Nam, Minkyung Ryu, Wooseok Song, Heeyoun Chi, Jeongkyu Kim, Kangseok Lee, Jeehyeon Bae
Journal of Industrial and Engineering Chemistry.2023; 126: 480. CrossRef
Regulation of transforming growth factor-β signaling as a therapeutic approach to treating colorectal cancer
Jana Maslankova, Ivana Vecurkovska, Miroslava Rabajdova, Jana Katuchova, Milos Kicka, Michala Gayova, Vladimir Katuch
World Journal of Gastroenterology.2022; 28(33): 4744. CrossRef

Changpingibacter yushuensis gen. nov., sp. nov., isolated from fluvial sediment in Qinghai Tibet Plateau of China: Yifan Jiao , Sihui Zhang , Jing Yang , Xin-He Lai , Kui Dong , Yanpeng Cheng , Mingchao Xu , Wentao Zhu , Shan Lu , Dong Jin , Ji Pu , Ying Huang , Liyun Liu , Suping Wang , Jianguo Xu; J. Microbiol. 2022;60(2):147-155. Published online January 7, 2022; DOI: https://doi.org/10.1007/s12275-022-1199-8

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Abstract

Two facultatively anaerobic, short rod-shaped, non-motile, Gram-stain-positive, unknown bacterial strains (JY-X040T and JY-X174) were isolated from fluvial sediments of Tongtian River in Yushu Tibetan Autonomous Prefecture, Qinghai province, China. Cells formed translucent, gray, round and convex colonies, with a diameter of less than 0.5 mm after 5 days of incubation at 30°C on brain heart infusion-5% sheep blood agar. The 16S rRNA gene sequence similarity between strain JY-X040T and Fudania jinshanensis 313T is 93.87%. In the four phylogenetic trees constructed based on the 16S rRNA gene and 423 core genes, the two isolates form an independent branch, phylogenetically closest to F. jinshanensis 313T, but could not be classified as a member of the genus Fudania or any other genus of the family Arcanobacteriaceae. The DNA G + C content of strain JY-X040T was 57.8%. Calculation
results
of average nucleotide identity, digital DNADNA hybridization value and amino acid identity between strain JY-X040T and F. jinshanensis 313T are 69.9%, 22.9%, and 64.1%. The major cellular fatty acids were C16:0 (23%) and C18:1ω9c (22%). The cell-wall peptidoglycan type was A5α (L-Lys-L-Ala-L-Lys-D-Glu). The polar lipids comprised diphosphatidylglycerol, phosphatidylglycerol, phosphatidylinositol, phosphatidylinositol mannoside and four unidentified components. The whole-cell sugars contained rhamnose and ribose. MK-10(H4) was the sole respiratory quinone. The minimum inhibitory concentration of streptomycin was 32 μg/ml. All physiological, biochemical, chemotaxonomic and genomic characteristics support that strains JY-X040T and JY-X174 represent members of a novel species in a new genus, Changpingibacter yushuensis gen. nov., sp. nov. The type strain is JY-X040T (GDMCC 1.1996T = KCTC 49514T).

Citations

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Metagenomic and Culturomics Analysis of Microbial Communities within Surface Sediments and the Prevalence of Antibiotic Resistance Genes in a Pristine River: The Zaqu River in the Lancang River Source Region, China
Yi Yan, Jialiang Xu, Wenmin Huang, Yufeng Fan, Zhenpeng Li, Mingkai Tian, Jinsheng Ma, Xin Lu, Jian Liang
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Bacterial diversity in arboreal ant nesting spaces is linked to colony developmental stage
Maximilian Nepel, Veronika E. Mayer, Veronica Barrajon-Santos, Dagmar Woebken
Communications Biology.2023;[Epub] CrossRef

CagL polymorphisms between East Asian and Western Helicobacter pylori are associated with different abilities to induce IL-8 secretion: Yun Hui Choi , Jing Lai , Myeong-A Kim , Aeryun Kim , Jinmoon Kim , Hanfu Su , Linhu Ge , Jeong-Heon Cha; J. Microbiol. 2021;59(8):763-770. Published online June 1, 2021; DOI: https://doi.org/10.1007/s12275-021-1136-2

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Abstract

Helicobacter pylori colonizes human gastric mucosa. Its infection is associated with gastric diseases including gastric cancer. CagA is one of the most important toxins produced by H. pylori. It is related to gastric cancer which can be injected into host cells via a type IV secretion system (T4SS). CagL is a structural component of T4SS apparatus, which triggers host cell signaling pathway. It has been reported that CagL polymorphisms may influence the severity of disease development. To explore the contribution of CagL polymorphisms between East Asian and Western H. pylori in pathogenesis, cagL gene in G27 H. pylori was swapped by K74 cagL which is identical to East Asian CagL consensus sequence and by Western 26695 H. pylori, resulting in G27ΔcagL/cagLK74 and G27ΔcagL/cagL26695, respectively. Intriguingly, G27ΔcagL/ cagLK74 showed significantly less ability of IL-8 induction than G27ΔcagL/cagL26695 while displayed similar abilities of CagA phosphorylation, and cell elongation. Taken together, this study suggests that the CagL polymorphism may influence IL-8 induction, and K74 CagL has less ability to induce IL-8 secretion than G27 or 26695 CagL. Further research should address how the different capabilities of IL-8 induction between intraspecies-CagL are associated with the large differences of the incidence of gastric cancer between East Asian and Western countries.

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Roles of the components of the cag -pathogenicity island encoded type IV secretion system in Helicobacter pylori
Lingzhu Gou, Xiaoping Yang, Jianwei Yun, Zenghui Ma, Xiaofeng Zheng, Hongwei Du, Dekui Zhang
Future Microbiology.2024; 19(14): 1253. CrossRef
Antibacterial and Immunoregulatory Effects of Metformin against Helicobacter pylori Infection in Rat Model
Hassan Valadbeigi, Saeed Khoshnood, Babak Negahdari, Mohd Azmuddin Abdullah, Mohammad Hossein Haddadi, Abhimanyu Abhimanyu
BioMed Research International.2023;[Epub] CrossRef
New CagL Amino Acid Polymorphism Patterns of Helicobacter pylori in Peptic Ulcer and Non-Ulcer Dyspepsia
Reyhan Caliskan, Silva Polat Sari, Bahadir Ercan, Kivanc Derya Peker, Mehtap Omac Sonmez, Ozer Akgul, Burcu Sapmaz, Aliye Soylu, Gokhan Tolga Adas, Yasar Ali Oner, Pelin Yuksel Mayda
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Journal of Microbiology.2021; 59(12): 1125. CrossRef

Natronorubrum halophilum sp. nov. isolated from two inland salt lakes: Cong-Qi Tao , Yi Ding , Yang-Jie Zhao , Heng-Lin Cui; J. Microbiol. 2020;58(2):105-112. Published online January 29, 2020; DOI: https://doi.org/10.1007/s12275-020-9514-8

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Abstract

Two halophilic archaeal strains, SHR37T and NEN6, were isolated from salt lakes located in the Tibet and Xinjiang regions of China. The two strains were found to form a single cluster (99.9% and 99.3% similarity, respectively) separating them from the six current members of Natronorubrum (94.7– 96.9% and 86.1–90.8% similarity, respectively) on the basis of the 16S rRNA and rpoB􍿁 gene sequence similarities and phylogenetic analysis. Diverse phenotypic characteristics differentiate strains SHR37T and NEN6 from current Natronorubrum members. Their polar lipids are C20C20 and C20C25 glycerol diether derivatives of PG, PGP-Me, and a major glycolipid chromatographically identical to disulfated mannosyl glucosyl diether (S2-DGD). Four minor unidentified glycolipids are also present. The OrthoANI and in silico DDH values of the two strains were 97.3% and 76.1%, respectively, which were much higher than the threshold values proposed as a species boundary (ANI 95–96% and in silico DDH 70%), which revealed that the two strains represent one species; the two values (ANI 79.0–81.9% and in silico DDH 23.5– 25.7%) of the strains examined in this study and the current members of Natronorubrum are much lower than the recommended threshold values, suggesting that strains SHR37T and NEN6 represent a genomically different species of Natronorubrum. These results showed that strains SHR37T (= CGMCC 1.15233T = JCM 30845T) and NEN6 (= CGMCC 1.17161) represent a novel species of Natronorubrum, for which the name Natronorubrum halophilum sp. nov. is proposed.

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Natrinema caseinilyticum sp. nov., Natrinema gelatinilyticum sp. nov., Natrinema marinum sp. nov., Natrinema zhouii sp. nov., extremely halophilic archaea isolated from marine environments and a salt mine
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Halobacterium wangiae sp. nov. and Halobacterium zhouii sp. nov., two extremely halophilic archaea isolated from sediment of a salt lake and saline soil of an inland saltern
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Zhang-Ping Wu, Xi-Wen Zheng, Ya-Ping Sun, Bei-Bei Wang, Jing Hou, Heng-Lin Cui
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Qiong Xue, Zhenqiang Zuo, Heng Zhou, Jian Zhou, Shengjie Zhang, Jing Han, Dahe Zhao, Hua Xiang
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Review

MINIREVIEW] Fungi in salterns: Dawoon Chung† , Haryun Kim† , Hyun Seok Choi; J. Microbiol. 2019;57(9):717-724. Published online August 27, 2019; DOI: https://doi.org/10.1007/s12275-019-9195-3

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Abstract

Salterns are hypersaline extreme environments with unique physicochemical properties such as a salinity gradient. Although the investigation of microbiota in salterns has focused on archaea and bacteria, diverse fungi also thrive in the brine and soil of salterns. Fungi isolated from salterns are represented by black yeasts (Hortaea werneckii, Phaeotheca triangularis, Aureobasidium pullulans, and Trimmatostroma salinum), Cladosporium, Aspergillus, and Penicillium species. Most studies on saltern-derived fungi gave attention to black yeasts and their physiological characteristics, including growth under various culture conditions. Since then, biochemical and molecular tools have been employed to explore adaptation of these fungi to salt stress. Genome databases of several fungi in salterns are now publicly available and being used to elucidate salt tolerance mechanisms and discover the target genes for agricultural and industrial applications. Notably, the number of enzymes and novel metabolites known to be produced by diverse saltern-derived fungi has increased significantly. Therefore, fungi in salterns are not only interesting and important subjects to study fungal biodiversity and adaptive mechanisms in extreme environments, but also valuable bioresources with potential for biotechnological applications.

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NOTE] Halomonas jeotgali sp. nov., a New Moderate Halophilic Bacterium Isolated from a Traditional Fermented Seafood: Min-Soo Kim , Seong Woon Roh , Jin-Woo Bae; J. Microbiol. 2010;48(3):404-410. Published online June 23, 2010; DOI: https://doi.org/10.1007/s12275-010-0032-y

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Abstract: A moderate halophilic, Gram-negative, non-motile, rod-shape, and aerobe designated as strain HwaT was isolated from traditional fermented Korean seafood, which presented as a single cell or paired cells. Optimal growth occurred at 25°C in 10% (w/v) salts at pH 7.0-8.0; however, growth occurred in a temperature range of 10-32°C, a salts concentration of 5-25% (w/v) and pH 5.0-10.0. Tests for oxidase and catalase were positive. The cells produced poly-β-hydroxybutyric acid, but not exopolysaccharide. Based on the 16S rRNA gene sequence, not only was there low similarity between strain HwaT and all other species (94.1% similarity with H. subglaciescola DSM 4683T, 94.0% similarity with H. sulfidaeris Esulfide1T, 93.6% similarity with H. cerina SP4T and 93.0% similarity with H. halodurans DSM 5160T), but the phylogenetic analysis revealed that the isolate may be classified as a novel species belonging to the genus Halomonas in the class Gammaproteobacteria. The predominant fatty acids of strain HwaT were C18:1 ω7c, C16:0, C12:0 3-OH and C16:1 ω7c/C15:0 iso 2-OH. The DNA G+C content was calculated as 61.7 mol%. Based on phenotypic, genotypic, and phylogenetic characteristics, it is proposed that the strain designated as HwaT be assigned to the genus Halomonas as Halomonas jeotgali sp. nov. (=KCTC 22487T =JCM 15645T).

The Diversity of Culturable Organotrophic Bacteria from Local Solar Salterns: Sun-Hee Yeon , Won-Jin Jeong , Jin-Sook Park; J. Microbiol. 2005;43(1):1-10.; DOI: https://doi.org/2146 [pii]

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Abstract: We isolated and cultured bacteria inhabiting solar saltern ponds in Taean-Gun, Chungnam Province, Korea. All of the isolated 64 strains were found to be moderately halophilic bacteria, growing in a salt range of 2-20 %, with an optimal concentration of 5% salt. Bacterial diversity among the isolated halophiles was evaluated via RFLP analyses of PCR-amplified 16S rDNAs, followed by phylogenetic analysis of the partial 16S rDNA sequences. The combination of restriction enzyme digestions with HaeIII, CfoI, MspI and RsaI generated 54 distinct patterns. A neighbor-joining tree of the partial 16S rDNA sequences resulted in the division of the 64 strains into 2 major groups, 45 strains of [gammar]-Proteobacteria (70.3%) and 19 strains of Firmicutes (29.7%). The [alpha]-Proteobacteria and Cytophaga-Flavobacterium-Bacterioides groups, which were repeatedly found to exist in thalassohaline environments, were not represented in our isolates. The [gammar]-Proteobacteria group consisted of several subgroups of the Vibrionaceae (37.5%), Pseudoalteromonadaceae (10.9%), Halomonadaceae (7.8%), Alteromonadaceae (7.8%), and Idiomarinaceae (6.3%). Members of Salinivibrio costicola (29.7%) were the most predominant species among all of the isolates, followed by Halobacillus treperi (12.5%). Additionally, three new species candidates were found, based on similarities of the 16S rDNA sequences to those of previously published species.

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