Journal of Microbiology

Journal Articles

Comparative Secretory Efficiency of Two Chitosanase Signal Peptides from Bacillus subtilis in Escherichia coli: Tae-Yang Eom, Yehui Gang, Youngdeuk Lee, Yoon-Hyeok Kang, Eunyoung Jo, Svini Dileepa Marasinghe, Heung Sik Park, Gun-Hoo Park, Chulhong Oh; J. Microbiol. 2024;62(12):1155-1164. Published online November 25, 2024; DOI: https://doi.org/10.1007/s12275-024-00186-1

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Abstract: The production of recombinant proteins in Escherichia coli is often challenged by cytoplasmic expression due to proteolytic degradation and inclusion body formation. Extracellular expression can overcome these problems by simplifying downstream processing and improving protein yields. This study aims to compare the efficiency of two Bacillus subtilis chitosanase signal peptides in mediating extracellular secretion in E. coli. We identified a naturally occurring mutant signal peptide (mCsn2-SP) from B. subtilis CH2 chitosanase (CH2CSN), which is characterized by a deletion of six amino acids in the N-region relative to the signal peptide (Csn1-SP) from B. subtilis CH1 chitosanase (CH1CSN). The CH1CSN and CH2CSN genes were cloned into the pET-11a vector and protein secretion was evaluated in E. coli BL21(DE3) host cells. Expression was induced with 0.1 mM and 1 mM isopropyl β-D-1-thiogalactopyranoside (IPTG) at 30 °C for one and three days. CH2CSN showed higher secretion levels compared to CH1CSN under all experimental conditions, especially with 0.1 mM IPTG induction for 3 days, which resulted in a 2.37-fold increase in secretion. Furthermore, it was demonstrated that mCsn2-SP is capable of secreting human Cu,Zn-superoxide dismutase (hSOD) in E. coli BL21(DE3) and successfully translocating it to the periplasmic region. This study represents the inaugural investigation into the utilisation of a naturally modified signal peptide, thereby corroborating the assertion that signal peptide deletion variants can influence protein secretion efficiency. Furthermore, the findings substantiate the proposition that such variants can serve as a viable alternative for the secretion of heterologous proteins in E. coli.

Upgrading Isoquercitrin Concentration via Submerge Fermentation of Mulberry Fruit Extract with Edible Probiotics to Suppress Gene Targets for Controlling Kidney Cancer and Inflammation: Md Rezaul Karim, Safia Iqbal, Shahnawaz Mohammad, Jong-Hoon Kim, Li Ling, Changbao Chen, Abdus Samad, Md Anwarul Haque, Deok-Chun Yang, Yeon Ju Kim, Dong Uk Yang; J. Microbiol. 2024;62(10):919-927. Published online October 8, 2024; DOI: https://doi.org/10.1007/s12275-024-00163-8

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In recent years, kidney cancer has become one of the most serious medical issues. Kidney cancer is treated with a variety of active compounds that trigger genes that cause cancer. We identified in our earlier research that isoquercitrin (IQ) can activate PIK3CA, IGF1R, and PTGS2. However, it has a very low bioavailability because of its lower solubility in water. So, we utilized sub-merge fermentation technology with two well-known probiotics, Lactobacillus acidophilus and Bacillus subtilis, as a microbial source and mulberry fruit extract as a substrate, which has a high IQ level to improve IQ yield. Furthermore, we compared the total phenolic, flavonoid, and antioxidant contents of fermented and non-fermented samples, and we found that the fermented samples had greater levels than non-fermented sample. In addition, the high-performance liquid chromatography (HPLC) results showed that the fermented mulberry fruit extract from B. subtilis and L. acidophilus showed higher IQ values (190.73 ± 0.004 μg/ml and 220.54 ± 0.007 μg/ml, respectively), compared to the non-fermented samples, which had IQ values (80.12 ± 0.002 μg/ml). Additionally, at 62.5 µg/ml doses of each sample, a normal kidney cell line (HEK 293) showed higher cell viability for fermented and non-fermented samples. Conversely, at the same doses, the fermented samples of L. acidophilus and B. subtilis in a kidney cancer cell line (A498) showed an inhibition of cell growth around 36% and 31%, respectively. Finally, we performed RT and qRT PCR assay, and we found a significant reduction in the expression of the PTGS2, PIK3CA, and IGF1R genes. We therefore can conclude that the fermented samples have a higher concentration of isoquercitrin, and also can inhibit the expression of the genes PTGS2, PIK3CA, and IGF1R, which in turn regulates kidney cancer and inflammation.

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Recent research on the bioactivity of polyphenols derived from edible fungi and their potential in chronic disease prevention
Wenbin Yu, Yufei Zhang, Yi Lu, Zhiwei Ouyang, Jiahua Peng, Yayi Tu, Bin He
Journal of Functional Foods.2025; 124: 106627. CrossRef

Hydroxychloroquine an Antimalarial Drug, Exhibits Potent Antifungal Efficacy Against Candida albicans Through Multitargeting: Sargun Tushar Basrani, Tanjila Chandsaheb Gavandi, Shivani Balasaheb Patil, Nandkumar Subhash Kadam, Dhairyasheel Vasantrao Yadav, Sayali Ashok Chougule, Sankunny Mohan Karuppayil, Ashwini Khanderao Jadhav; J. Microbiol. 2024;62(5):381-391. Published online April 8, 2024; DOI: https://doi.org/10.1007/s12275-024-00111-6

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Abstract: Candida albicans is the primary etiological agent associated with candidiasis in humans. Unrestricted growth of C. albicans can progress to systemic infections in the worst situation. This study investigates the antifungal activity of Hydroxychloroquine (HCQ) and mode of action against C. albicans. HCQ inhibited the planktonic growth and yeast to hyphal form morphogenesis of C. albicans significantly at 0.5 mg/ml concentration. The minimum inhibitory concentrations (MIC(50)) of HCQ for C. albicans adhesion and biofilm formation on the polystyrene surface was at 2 mg/ml and 4 mg/ml respectively. Various methods, such as scanning electron microscopy, exploration of the ergosterol biosynthesis pathway, cell cycle analysis, and assessment of S oxygen species (ROS) generation, were employed to investigate HCQ exerting its antifungal effects. HCQ was observed to reduce ergosterol levels in the cell membranes of C. albicans in a dose-dependent manner. Furthermore, HCQ treatment caused a substantial arrest of the C. albicans cell cycle at the G0/G1 phase, which impeded normal cell growth. Gene expression analysis revealed upregulation of SOD2, SOD1, and CAT1 genes after HCQ treatment, while genes like HWP1, RAS1, TEC1, and CDC 35 were downregulated. The study also assessed the in vivo efficacy of HCQ in a mice model, revealing a reduction in the pathogenicity of C. albicans after HCQ treatment. These results indicate that HCQ holds for the development of novel antifungal therapies.

Biosynthesis of Chryseno[2,1,c]oxepin‑12‑Carboxylic Acid from Glycyrrhizic Acid in Aspergillus terreus TMZ05‑2, and Analysis of Its Anti‑inflammatory Activity: Liangliang Chen , Lin Zhao , Ju Han , Ping Xiao , Mingzhe Zhao , Sen Zhang , Jinao Duan; J. Microbiol. 2024;62(2):113-124. Published online February 27, 2024; DOI: https://doi.org/10.1007/s12275-024-00105-4

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Abstract

Glycyrrhizic acid, glycyrrhetinic acid, and their oxo, ester, lactone, and other derivatives, are known for their anti-inflammatory, anti-oxidant, and hypoglycemic pharmacological activities. In this study, chryseno[2,1-c]oxepin-12-carboxylic acid (MG) was first biosynthesized from glycyrrhizic acid through sequential hydrolysis, oxidation, and esterification using Aspergillus terreus TMZ05-2, providing a novel in vitro biosynthetic pathway for glycyrrhizic acid derivatives. Assessing the influence of fermentation conditions and variation of strains during culture under stress-induction strategies enhanced the final molar yield to 88.3% (5 g/L glycyrrhizic acid). CCK8 assays showed no cytotoxicity and good cell proliferation, and anti-inflammatory experiments demonstrated strong inhibition of NO release (36.3%, low-dose MG vs. model), transcriptional downregulation of classical effective cellular factors tumor necrosis factor-α (TNF-α; 72.2%, low-dose MG vs. model), interleukin-6 (IL-6; 58.3%, low-dose MG vs. model) and interleukin-1β (IL-1β; 76.4%, low-dose MG vs. model), and decreased abundance of P-IKK-α, P-IKB-α, and P-P65 proteins, thereby alleviating inflammatory responses through the NF-κB pathway in LPS-induced RAW264.7 cells. The findings provide a reference for the biosynthesis of lactone compounds from medicinal plants.

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Efficient directional biosynthesis of isoquercitrin from quercetin by Bacillus subtilis CD-2 and its anti-inflammatory activity
Ju Han, Jingru Ma, Ruiqi He, Fan Yang, Jingyi Meng, Jiaqi Liu, Fanxing Shi, Jinao Duan, Liangliang Chen, Sen Zhang
Natural Product Research.2024; : 1. CrossRef

Review

Searching for a Reliable Viral Indicator of Faecal Pollution in Aquatic Environments: Felana Harilanto Andrianjakarivony , Yvan Bettarel , Christelle Desnues; J. Microbiol. 2023;61(6):589-602. Published online June 1, 2023; DOI: https://doi.org/10.1007/s12275-023-00052-6

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Abstract

The disposal of sewage in significant quantities poses a health hazard to aquatic ecosystems. These effluents can contain a wide range of pathogens, making faecal contamination a leading source of waterborne diseases around the world. Yet monitoring bacteria or viruses in aquatic environments is time consuming and expensive. The standard indicators of faecal pollution all have limitations, including difficulty in determining the source due to lack of host specificity, poor connection with the presence of non-bacterial pathogens, or low environmental persistence. Innovative monitoring techniques are sorely needed to provide more accurate and targeted solutions. Viruses are a promising alternative to faecal indicator bacteria for monitoring, as they are more persistent in ambient water, more abundant in faeces, and are extremely host-specific. Given the range of viruses found in diverse contexts, it is not easy to find one “ideal” viral indicator of faecal pollution; however, several are of interest. In parallel, the ongoing development of molecular techniques coupled with metagenomics and bioinformatics should enable improved ways to detect faecal contamination using viruses. This review examines the evolution of faecal contamination monitoring with the following aims (i) to identify the characteristics of the main viral indicators of faecal contamination, including human enteric viruses, bacteriophages, CRESS and plant viruses, (ii) to assess how these have been used to monitor water pollution in recent years, (iii) to evaluate the reliability of recent detection methods of such viruses, and (iv) to tentatively determine which viruses may be most effective as markers of faecal pollution.

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Review of carbon dot–hydrogel composite material as a future water-environmental regulator
Minghao Jiang, Yong Wang, Jichuan Li, Xing Gao
International Journal of Biological Macromolecules.2024; 269: 131850. CrossRef

Journal Articles

Potential Use of Mycobacterium paragordonae for Antimycobacterial Drug Screening Systems: Ga-Yeong Cha , Hyejun Seo , Jaehun Oh , Byoung-Jun Kim , Bum-Joon Kim; J. Microbiol. 2023;61(1):121-129. Published online January 31, 2023; DOI: https://doi.org/10.1007/s12275-022-00009-1

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Abstract

Our recent genome-based study indicated that Mycobacterium paragordonae (Mpg) has evolved to become more adapted to an intracellular lifestyle within free-living environmental amoeba and its enhanced intracellular survival within Acanthamoeba castellanii was also proved. Here, we sought to investigate potential use of Mpg for antimycobacterial drug screening systems. Our data showed that Mpg is more susceptible to various antibiotics compared to the close species M. marinum (Mmar) and M. gordonae, further supporting its intracellular lifestyle in environments, which would explain its protection from environmental insults. In addition, we developed two bacterial whole-cell-based drug screening systems using a recombinant Mpg stain harboring a luciferase reporter vector (rMpg-LuxG13): one for direct application to rMpg-LuxG13 and the other for drug screening via the interaction of rMpg-LuxG13 with A. castellanii. Direct application to rMpg-LuxG13 showed lower inhibitory concentration 50 ( IC50) values of rifampin, isoniazid, clarithromycin, and ciprofloxacin against Mpg compared to Mmar. Application of drug screening system via the interaction of rMpg-LuxG13 with A. castellanii also exhibited lower IC50 values for rifampin against Mpg compared to Mmar. In conclusion, our data indicate that Mpg is more susceptible to various antibiotics than other strains. In addition, our data also demonstrate the feasibility of two whole cellbased drug screening systems using rMpg-LuxG13 strain for the discovery of novel anti-mycobacterial drugs.

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Protection against tuberculosis achieved by dissolving microneedle patches loaded with live Mycobacterium paragordonae in a BCG prime-boost strategy
Mi-Hyun Lee, Hyejun Seo, Moon-Su Lee, Byoung Jun Kim, Hye Lin Kim, Du Hyung Lee, Jaehun Oh, Ju Yeop Shin, Ju Young Jin, Do Hyeon Jeong, Bum-Joon Kim
Frontiers in Immunology.2023;[Epub] CrossRef

Coumarin-based combined computational study to design novel drugs against Candida albicans: Akhilesh Kumar Maurya , Nidhi Mishra; J. Microbiol. 2022;60(12):1201-1207. Published online November 10, 2022; DOI: https://doi.org/10.1007/s12275-022-2279-5

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Abstract

Candida species cause the most prevalent fungal illness, candidiasis. Candida albicans is known to cause bloodstream infections. This species is a commensal bacterium, but it can cause hospital–acquired diseases, particularly in COVID-19 patients with impaired immune systems. Candida infections have increased in patients with acute respiratory distress syndrome. Coumarins are both naturally occurring and synthetically produced. In this study, the biological activity of 40 coumarin derivatives was used to create a three-dimensional quantitative structure activity relationship (3D-QSAR) model. The training and test minimum inhibitory concentration values of C. albicans active compounds were split, and a regression model based on statistical data was established. This model served as a foundation for the creation of coumarin derivative QSARs. This is a unique way to create new therapeutic compounds for various ailments. We constructed novel structural coumarin derivatives using the derived QSAR model, and the models were confirmed using molecular docking and molecular dynamics simulation.

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Coumarin derivatives ameliorate the intestinal inflammation and pathogenic gut microbiome changes in the model of infectious colitis through antibacterial activity
Hui-su Jung, Yei Ju Park, Bon-Hee Gu, Goeun Han, Woonhak Ji, Su mi Hwang, Myunghoo Kim
Frontiers in Cellular and Infection Microbiology.2024;[Epub] CrossRef
Therapeutic Effects of Coumarins with Different Substitution Patterns
Virginia Flores-Morales, Ana P. Villasana-Ruíz, Idalia Garza-Veloz, Samantha González-Delgado, Margarita L. Martinez-Fierro
Molecules.2023; 28(5): 2413. CrossRef
Cyclometalated iridium(III) complexes combined with fluconazole: antifungal activity against resistant C. albicans
Jun-Jian Lu, Zhi-Chang Xu, Hou Zhu, Lin-Yuan Zhu, Xiu-Rong Ma, Rui-Rui Wang, Rong-Tao Li, Rui-Rong Ye
Frontiers in Cellular and Infection Microbiology.2023;[Epub] CrossRef

Rasiella rasia gen. nov. sp. nov. within the family Flavobacteriaceae isolated from seawater recirculating aquaculture system: Seong-Jin Kim , Young-Sam Kim , Sang-Eon Kim , Hyun-Kyoung Jung , Jeeeun Park , Min-Ju Yu , Kyoung-Ho Kim; J. Microbiol. 2022;60(11):1070-1076. Published online October 17, 2022; DOI: https://doi.org/10.1007/s12275-022-2099-7

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Abstract

A novel bacterium designated RR4-40T was isolated from a biofilter of seawater recirculating aquaculture system in Busan, South Korea. Cells are strictly aerobic, Gram-negative, irregular short rod, non-motile, and oxidase- and catalase-negative. Growth was observed at 15–30°C, 0.5–6% NaCl (w/v), and pH 5.0–9.5. The strain grew optimally at 28°C, 3% salinity (w/v), and pH 8.5. The phylogenetic analysis based on 16S rRNA gene sequences showed that strain RR4-40T was most closely related to Marinirhabdus gelatinilytica NH83T (94.16% of 16S rRNA gene similarity) and formed a cluster with genera within the family Flavobacteriaceae. The values of the average nucleotide identity (ANI), digital DNA-DNA hybridization (dDDH), and average amino acid identity (AAI) between genomes of strain RR4-40T and M. gelatinilytica NH83T were 72.91, 18.2, and 76.84%, respectively, and the values against the strains in the other genera were lower than those. The major fatty acids were iso-C15:0 (31.34%), iso-C17:0 3-OH (13.65%), iso-C16:0 3-OH (10.61%), and iso-C15:1 G (10.38%). The polar lipids comprised phosphatidylglycerol, diphosphatidylglycerol, aminophospholipid, aminolipid, glycolipid, and sphingolipid. The major respiratory quinone was menaquinone-6 (MK-6) and the DNA G + C content of strain RR4-40T was 37.4 mol%. According to the polyphasic analysis, strain RR4-40T is considered to represent a novel genus within the family Flavobacteriaceae, for which the name Rasiella rasia gen. nov, sp. nov. is proposed. The type strain is RR4-40T (= KCTC 52650T = MCCC 1K04210T).

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Rhodobacteraceae are Prevalent and Ecologically Crucial Bacterial Members in Marine Biofloc Aquaculture
Meora Rajeev, Jang-Cheon Cho
Journal of Microbiology.2024; 62(11): 985. CrossRef
Validation List no. 215. Valid publication of new names and new combinations effectively published outside the IJSEM
Aharon Oren, Markus Göker
International Journal of Systematic and Evolutionary Microbiology .2024;[Epub] CrossRef

Sulforaphane kills Mycobacterium tuberculosis H37Ra and Mycobacterium smegmatis mc2155 through a reactive oxygen species dependent mechanism: Yongjie Zhao , Shengwen Shang , Ya Song , Tianyue Li , Mingliang Han , Yuexuan Qin , Meili Wei , Jun Xi , Bikui Tang; J. Microbiol. 2022;60(11):1095-1105. Published online September 1, 2022; DOI: https://doi.org/10.1007/s12275-022-2284-8

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Abstract

Mycobacterium tuberculosis (M. tuberculosis) is a highly pathogenic intracellular pathogen that causes tuberculosis (TB), the leading cause of mortality from single infections. Redox homeostasis plays a very important role in the resistance of M. tuberculosis to antibiotic damage and various environmental stresses. The antioxidant sulforaphane (SFN) has been reported to exhibit anticancer activity and inhibit the growth of a variety of bacteria and fungi. Nonetheless, it remains unclear whether SFN exhibits anti-mycobacterial activity. Our
results
showed that the SFN against M. tuberculosis H37Ra exhibited bactericidal activity in a time and dose-dependent manner. The anti-tubercular activity of SFN was significantly correlated with bacterial reactive oxygen species (ROS) levels. In addition, SFN promoted the bactericidal effect of macrophages on intracellular bacteria in a dose-dependent manner, mediated by increasing intracellular mitochondrial ROS levels and decreasing cytoplasmic ROS levels. Taken together, our data revealed the previously unrecognized antimicrobial functions of SFN. Future studies focusing on the mechanism of SFN in macrophages against M. tuberculosis are essential for developing new host-directed therapeutic approaches against TB.

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NK-derived exosome miR-1249-3p inhibits Mycobacterium tuberculosis survival in macrophages by targeting SKOR1
Fengqian Ma, Xuan Wang, Zhanghua Qiu, Shoupeng Ding, Wenya Du, Yumei Dai, Tao Ma, Linzhi Yue, Guofu Wang, Tao Wang, Ling Geng, Lixian Wu
Cytokine.2024; 175: 156481. CrossRef
Lactobacillus plantarum increase the sulforaphane formation efficiency via microbial-targeted delivery system in vivo
Yunping Wang, Yiteng Zhang, Xiude Li, Liping Luo, Fangjian Ning, Tao Liu, Jinwang Li
Food Bioscience.2024; 62: 105544. CrossRef
Identifying autophagy-related genes as potential targets for immunotherapy in tuberculosis
Sifang Xiao, Ting Zhou, Jianhua Pan, Xiaohua Ma, Guomin Shi, Binyuan Jiang, Yan-gen Xiang
International Immunopharmacology.2023; 118: 109956. CrossRef

Crystal structure of the phage-encoded N-acetyltransferase in complex with acetyl-CoA, revealing a novel dimeric arrangement: Nayeon Ki , Inseong Jo , Yongseong Hyun , Jinwook Lee , Nam-Chul Ha , Hyun-Myung Oh; J. Microbiol. 2022;60(7):746-755. Published online July 4, 2022; DOI: https://doi.org/10.1007/s12275-022-2030-2

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Abstract

Bacteriophages employ diverse mechanisms to facilitate the proliferation of bacteriophages. The Salmonella-infecting phage SPN3US contains a putative N-acetyltransferase, which is widely found in bacteriophages. However, due to low sequence similarity to the N-acetyltransferases from bacteria and eukaryotic cells, the structure and function of phage-encoded acetyltransferases are mainly unknown. This study determines the crystal structure of the putative N-acetyltransferase of SPN3US in complex with acetyl-CoA. The crystal structure showed a novel homodimeric arrangement stabilized by exchanging the C-terminal α-helix within the dimer. The following biochemical analyses suggested that the phageencoded acetyltransferase might have a very narrow substrate specificity. Further studies are required to reveal the biochemical activity, which would help elucidate the interaction between the phage and host bacteria in controlling pathogenic bacteria.

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Posttranslational modifications in bacteria during phage infection
Hannelore Longin, Nand Broeckaert, Vera van Noort, Rob Lavigne, Hanne Hendrix
Current Opinion in Microbiology.2024; 77: 102425. CrossRef

Review

Overview of bioinformatic methods for analysis of antibiotic resistome from genome and metagenome data: Kihyun Lee , Dae-Wi Kim , Chang-Jun Cha; J. Microbiol. 2021;59(3):270-280. Published online February 23, 2021; DOI: https://doi.org/10.1007/s12275-021-0652-4

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Abstract

Whole genome and metagenome sequencing are powerful approaches that enable comprehensive cataloging and profiling of antibiotic resistance genes at scales ranging from a single clinical isolate to ecosystems. Recent studies deal with genomic and metagenomic data sets at larger scales; therefore, designing computational workflows that provide high efficiency and accuracy is becoming more important. In this review, we summarize the computational workflows used in the research field of antibiotic resistome based on genome or metagenome sequencing. We introduce workflows, software tools, and data resources that have been successfully employed in this rapidly developing field. The workflow described in this review can be used to list the known antibiotic resistance genes from genomes and metagenomes, quantitatively profile them, and investigate the epidemiological and evolutionary contexts behind their emergence and transmission. We also discuss how novel antibiotic resistance genes can be discovered and how the association between the resistome and mobilome can be explored.

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Unraveling resistance mechanisms in combination therapy: A comprehensive review of recent advances and future directions
Nami Morales-Durán, Angel León-Buitimea, José R. Morones-Ramírez
Heliyon.2024; 10(6): e27984. CrossRef
Resistome Mapping in Foodborne Pathogens: Understanding Role in the Transmission Dynamics of Resistance Genes
Muneer Oladipupo Yaqub, Chinedu Eucharia Joseph, Aashika Jain, Lekshmi K. Edison
Applied Microbiology.2024; 4(4): 1476. CrossRef
Metagenomic assemblies tend to break around antibiotic resistance genes
Anna Abramova, Antti Karkman, Johan Bengtsson-Palme
BMC Genomics.2024;[Epub] CrossRef
Comprehensive genomic landscape of antibiotic resistance in Staphylococcus epidermidis
Do-Hoon Lee, Kihyun Lee, Yong-Seok Kim, Chang-Jun Cha, Jack A. Gilbert
mSystems.2024;[Epub] CrossRef
Web-Based Tools Validation for Antimicrobial Resistance Prediction: An Empirical Comparative Analysis
Sweta Padma Routray, Swayamprabha Sahoo, Debasish Swapnesh Kumar Nayak, Sejal Shah, Tripti Swarnkar
SN Computer Science.2024;[Epub] CrossRef
Genome-centric analyses of 165 metagenomes show that mobile genetic elements are crucial for the transmission of antimicrobial resistance genes to pathogens in activated sludge and wastewater
Nafi’u Abdulkadir, Joao Pedro Saraiva, Junya Zhang, Stefan Stolte, Osnat Gillor, Hauke Harms, Ulisses Rocha, Adriana E. Rosato
Microbiology Spectrum.2024;[Epub] CrossRef
Identification of Antibiotic Resistance in ESKAPE Pathogens through Plasmonic Nanosensors and Machine Learning
Ting Yu, Ying Fu, Jintao He, Jun Zhang, Yunlei Xianyu
ACS Nano.2023; 17(5): 4551. CrossRef
The challenges of defining the human nasopharyngeal resistome
Lucy O’Connor, Robert Heyderman
Trends in Microbiology.2023; 31(8): 816. CrossRef
Resistome profiling reveals transmission dynamics of antimicrobial resistance genes from poultry litter to soil and plant
Animesh Tripathi, Dinesh Kumar, Priyank Chavda, Dalip Singh Rathore, Ramesh Pandit, Damer Blake, Fiona Tomley, Madhvi Joshi, Chaitanya G. Joshi, Suresh Kumar Dubey
Environmental Pollution.2023; 327: 121517. CrossRef
Prioritization of Critical Factors for Surveillance of the Dissemination of Antibiotic Resistance in Pseudomonas aeruginosa: A Systematic Review
Jung Hun Lee, Nam-Hoon Kim, Kyung-Min Jang, Hyeonku Jin, Kyoungmin Shin, Byeong Chul Jeong, Dae-Wi Kim, Sang Hee Lee
International Journal of Molecular Sciences.2023; 24(20): 15209. CrossRef
Flavobacterium psychrotrophum sp. nov. and Flavobacterium panacagri sp. nov., Isolated from Freshwater and Soil
Yong-Seok Kim, Eun-Mi Hwang, Chang-Myeong Jeong, Chang-Jun Cha
Journal of Microbiology.2023; 61(10): 891. CrossRef
Antimicrobial Resistance Genes (ARGs), the Gut Microbiome, and Infant Nutrition
Rufus J. Theophilus, Diana Hazard Taft
Nutrients.2023; 15(14): 3177. CrossRef
Metagenomic Insight into Sulfonamide-Induced Variation in Antibiotic Resistome of Soil Associated with Taxonomy, Mobile Genetic Elements (MGEs), and Function
Mi Li, Xiaoyu Xiao, Zhangsong Jiang, Haihui Tang, Lingling Rong, Tiao Zhang, Taijia Li, Cui Hu, Ligui Wu, Xiaoming Zou
ACS Agricultural Science & Technology.2022; 2(1): 123. CrossRef
Gold nanoparticle-DNA aptamer-assisted delivery of antimicrobial peptide effectively inhibits Acinetobacter baumannii infection in mice
Jaeyeong Park, Eunkyoung Shin, Ji-Hyun Yeom, Younkyung Choi, Minju Joo, Minho Lee, Je Hyeong Kim, Jeehyeon Bae, Kangseok Lee
Journal of Microbiology.2022; 60(1): 128. CrossRef
Promising Acinetobacter baumannii Vaccine Candidates and Drug Targets in Recent Years
Yong Chiang Tan, Chandrajit Lahiri
Frontiers in Immunology.2022;[Epub] CrossRef
Recent Advances in Rapid Antimicrobial Susceptibility Testing
Rucha Datar, Sylvain Orenga, Romain Pogorelcnik, Olivier Rochas, Patricia J Simner, Alex van Belkum
Clinical Chemistry.2021; 68(1): 91. CrossRef
Chromosomal integration of Tn5253 occurs downstream of a conserved 11-bp sequence of the rbgA gene in Streptococcus pneumoniae and in all the other known hosts of this integrative conjugative element (ICE)
Francesco Santoro, Valeria Fox, Alessandra Romeo, Elisa Lazzeri, Gianni Pozzi, Francesco Iannelli
Mobile DNA.2021;[Epub] CrossRef
Omics-based microbiome analysis in microbial ecology: from sequences to information
Jang-Cheon Cho
Journal of Microbiology.2021; 59(3): 229. CrossRef

Journal Articles

Expression of sexual genes in Aspergillus fumigatus homogeneous culture produced by vegetative mass mating: Joo-Yeon Lim , Hee-Moon Park; J. Microbiol. 2019;57(8):688-693. Published online May 11, 2019; DOI: https://doi.org/10.1007/s12275-019-9094-7

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Abstract

There are presently no studies on the genes for sexual development of Aspergillus fumigatus in situ using mating culture, primarily because of challenging experimental conditions that require a significantly long period of induction and produce developmentally heterogenous culture, harboring very few sexual organs. In order to overcome these challenges, we developed an efficient and convenient procedure called ‘vegetative mass mating (VeM)’ for study at a molecular level. The VeM method enabled production of a developmentally homogenous A. fumigatus culture, harboring many sexual organs in a plate within a short period of two weeks. Feasibility of the use of VeM for functional study of genes during A. fumigatus sexual development was evaluated by analyzing the transcription pattern of genes involved in pheromone signal transduction and regulation of sexual development. Here, we present for the first time, an in situ expression pattern of sexual genes during the mating process, induced by the VeM
method
, which will enable and promote the sexual development study of A. fumigatus at the molecular level.

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The Gβ-like Protein AfCpcB Affects Sexual Development, Response to Oxidative Stress and Phagocytosis by Alveolar Macrophages in Aspergillus fumigatus
Joo-Yeon Lim, Yeon-Ju Kim, Hee-Moon Park
Journal of Fungi.2022; 8(1): 56. CrossRef
The LAMMER Kinase, LkhA, Affects Aspergillus fumigatus Pathogenicity by Modulating Reproduction and Biosynthesis of Cell Wall PAMPs
Joo-Yeon Lim, Yeon Ju Kim, Seul Ah Woo, Jae Wan Jeong, Yu-Ri Lee, Cheol-Hee Kim, Hee-Moon Park
Frontiers in Cellular and Infection Microbiology.2021;[Epub] CrossRef
Global Sexual Fertility in the Opportunistic Pathogen Aspergillus fumigatus and Identification of New Supermater Strains
Sameira S. Swilaiman, Céline M. O’Gorman, Wenyue Du, Janyce A. Sugui, Joanne Del Buono, Matthias Brock, Kyung J. Kwon-Chung, George Szakacs, Paul S. Dyer
Journal of Fungi.2020; 6(4): 258. CrossRef

Roles of eIF4E-binding protein Caf20 in Ste12 translation and P-body formation in yeast: Kiyoung Park , Yu-Seon Lee , Daehee Jung , Jinmi Kim; J. Microbiol. 2018;56(10):744-747. Published online August 22, 2018; DOI: https://doi.org/10.1007/s12275-018-8230-0

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Abstract

Translation initiation factor eIF4E forms eIF4E-eIF4G complex at the 5’ cap of mRNA. This interaction can be inhibited by the family of 4E-binding proteins (4E-BP). In yeast Saccharomyces cerevisiae, two 4E-BPs, Caf20 and Eap1, compete with eIF4G for binding to eIF4E via the shared conserved interaction motif. In order to investigate the roles of Caf20 in gene-specific translational regulation and the formation of mRNA granules (P-bodies), we introduced substitution mutations, caf20-Y4A or caf20-L9A, in the eIF4E-binding motif for CAF20. Overexpression of the wild-type CAF20 showed an increased protein level of Ste12 transcription factor as well as highly developed P-body formation. However, 4E-binding site mutations of CAF20 led to a reduced number of P-body foci and decreased levels of Ste12 protein. The phenotypes of the caf20 deletion mutation were also analyzed, and we suggest that Caf20 plays a critical role in Ste12 protein expression and in the control of P-body formation.

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Proteomic analysis revealed the roles of YRR1 deletion in enhancing the vanillin resistance of Saccharomyces cerevisiae
Wenyan Cao, Weiquan Zhao, Bolun Yang, Xinning Wang, Yu Shen, Tiandi Wei, Wensheng Qin, Zailu Li, Xiaoming Bao
Microbial Cell Factories.2021;[Epub] CrossRef
Functional association of Loc1 and Puf6 with RNA helicase Dhh1 in translational regulation of Saccharomyces cerevisiae Ste12
Daehee Jung, Jong Seok Seo, Jayoung Nam, Jinmi Kim, Enrico Baruffini
PLOS ONE.2019; 14(7): e0220137. CrossRef

Identification of a novel phospholipase D gene and effects of carbon sources on its expression in Bacillus cereus ZY12: Yu Zhao , Yinfeng Xu , Fang Yu , Chunzhi Zhang; J. Microbiol. 2018;56(4):264-271. Published online April 2, 2018; DOI: https://doi.org/10.1007/s12275-018-7529-1

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Abstract

In the present study, a new strain, Bacillus cereus ZY12, producing phospholipase D (PLD) was identified. The expression of PLD in this strain was found to be induced by its substrate, phosphatidylcholine (PC), and completely silenced by other carbon sources, such as glucose, fructose, and maltose, which are generally used in microbial growth cultures, thus presenting a unique expression pattern different from other PLD-producing microorganisms. This study is the first to report on the ability of B. cereus to produce PLD, and successfully clone its PLD-coding gene and identify its function, extending the knowledge on PLD distribution and evolution in microorganisms.

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Structural insights into PA3488-mediated inactivation of Pseudomonas aeruginosa PldA
Xiaoyun Yang, Zongqiang Li, Liang Zhao, Zhun She, Zengqiang Gao, Sen-Fang Sui, Yuhui Dong, Yanhua Li
Nature Communications.2022;[Epub] CrossRef
Construction of a Super-Folder Fluorescent Protein-Guided Secretory Expression System for the Production of Phospholipase D in Bacillus subtilis
Haiyang Zhang, Xuehan Li, Qi Liu, Jianan Sun, Francesco Secundo, Xiangzhao Mao
Journal of Agricultural and Food Chemistry.2021; 69(24): 6842. CrossRef
Microbial phospholipase D: Identification, modification and application
Zhenxia Zhang, Ming Chen, Wei Xu, Wenli Zhang, Tao Zhang, Cuie Guang, Wanmeng Mu
Trends in Food Science & Technology.2020; 96: 145. CrossRef

Functional expression and enzymatic characterization of Lactobacillus plantarum cyclomaltodextrinase catalyzing novel acarbose hydrolysis: Myoung-Uoon Jang , Hye-Jeong Kang , Chang-Ku Jeong , Yewon Kang , Ji-Eun Park , Tae-Jip Kim; J. Microbiol. 2018;56(2):113-118. Published online February 2, 2018; DOI: https://doi.org/10.1007/s12275-018-7551-3

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Abstract

Cyclomaltodextrinases (CDases) belong to Glycoside Hydrolases (GH) family 13, which show versatile hydrolyzing and/or transglycosylation activity against cyclodextrin (CD), starch, and pullulan. Especially, some CDases have been reported to hydrolyze acarbose, a potent α-glucosidase inhibitor, and transfer the resulting acarviosine-glucose to various acceptors. In this study, a novel CDase (LPCD) gene was cloned from Lactobacillus plantarum WCFS1, which encodes 574 amino acids (64.6 kDa) and shares less than 44% of identities with the known CDase-family enzymes. Recombinant LPCD with C-terminal six-histidines was produced and purified from Escherichia coli. It showed the highest activity on β-CD at 45°C and pH 5.0, respectively. Gel permeation chromatography analysis revealed that LPCD exists as a dodecameric form (~826 kDa). Its hydrolyzing activity on β- CD is almost same as that on starch, whereas it can hardly attack pullulan. Most interestingly, LPCD catalyzed the unique modes of action in acarbose hydrolysis to produce maltose and acarviosine, as well as to glucose and acarviosineglucose.

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