Journal of Microbiology

Journal Articles

Promoter exchange of the cryptic nonribosomal peptide synthetase gene for oligopeptide production in Aspergillus oryzae: Chanikul Chutrakul , Sarocha Panchanawaporn , Sukanya Jeennor , Jutamas Anantayanon , Kobkul Laoteng; J. Microbiol. 2022;60(1):47-56. Published online November 9, 2021; DOI: https://doi.org/10.1007/s12275-022-1442-3

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Oligopeptides with functional activities are of current interest in the nutraceutical and medical sectors. The development of the biosynthetic process of oligopeptides through a nonribosomal peptide synthetase (NRPS) system has become more challenging. To develop a production platform for nonribosomal peptides (NRPs), reprogramming of transcriptional regulation of the acv gene encoded ACV synthetase (ACVS) was implemented in Aspergillus oryzae using the CRISPRCas9 system. Awakening silent acv expression was successfully achieved by promoter substitution. Among the three exchanged promoters, AoPgpdA, AoPtef1, and PtPtoxA, the replacement of the native promoter with AoPgpdA led to the highest ACV production in A. oryzae. However, the ACV production of the AoPGpdA strain was also dependent on the medium composition, in which urea was the best nitrogen source, and a C:N ratio of 20:1 was optimal for tripeptide production. In addition to cell growth, magnesium ions are an essential element for ACV production and might participate in ACVS activity. It was also found that ACV was the growthassociated product of the engineered strain that might be a
result
of constitutive transcriptional control by the AoPgpdA promoter. This study offers a potential strategy for nonribosomal ACV production using the fungal system, which is applicable for redesigning bioactive oligopeptides with industrial relevance.

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Strategies for the Enhancement of Secondary Metabolite Production via Biosynthesis Gene Cluster Regulation in Aspergillus oryzae
Xiao Jia, Jiayi Song, Yijian Wu, Sai Feng, Zeao Sun, Yan Hu, Mengxue Yu, Rui Han, Bin Zeng
Journal of Fungi.2024; 10(5): 312. CrossRef
Transcriptome-based Mining of the Constitutive Promoters for Tuning Gene Expression in Aspergillus oryzae
Kobkul Laoteng, Jutamas Anantayanon, Chanikul Chutrakul, Sarocha Panchanawaporn, Sukanya Jeennor
Journal of Microbiology.2023; 61(2): 199. CrossRef
Efficient de novo production of bioactive cordycepin by Aspergillus oryzae using a food-grade expression platform
Sukanya Jeennor, Jutamas Anantayanon, Sarocha Panchanawaporn, Chanikul Chutrakul, Wanwipa Vongsangnak, Kobkul Laoteng
Microbial Cell Factories.2023;[Epub] CrossRef
Synthetic microbes and biocatalyst designs in Thailand
Duangthip Trisrivirat, Ruchanok Tinikul, Pimchai Chaiyen
Biotechnology Notes.2023; 4: 28. CrossRef
Potential of Aspergillus oryzae as a biosynthetic platform for indigoidine, a non-ribosomal peptide pigment with antioxidant activity
Sarocha Panchanawaporn, Chanikul Chutrakul, Sukanya Jeennor, Jutamas Anantayanon, Nakul Rattanaphan, Kobkul Laoteng, Daniel Cullen
PLOS ONE.2022; 17(6): e0270359. CrossRef
CRISPR/Cas9-Based Genome Editing and Its Application in Aspergillus Species
Feng-Jie Jin, Bao-Teng Wang, Zhen-Dong Wang, Long Jin, Pei Han
Journal of Fungi.2022; 8(5): 467. CrossRef

Molecular genomic characterization of severe fever with thrombocytopenia syndrome virus isolates from South Korea: Yu Jung Won , Lae Hyung Kang , Sung Geun Lee , Seung Won Park , Jae Ik Han , Soon Young Paik; J. Microbiol. 2019;57(10):927-937. Published online August 3, 2019; DOI: https://doi.org/10.1007/s12275-019-9174-8

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Abstract

Severe fever with thrombocytopenia syndrome (SFTS) is a tick-borne emerging infectious disease caused by the SFTS virus (SFTSV) and is a threat to public health due to its high fatality rate. However, details on tick-to-human transmission of SFTSV are limited. In this study, we determined the wholegenome sequence of a South Korean SFTSV strain (CUKJJ01), compared it to those of other recent human SFTSV isolates, and identified the genetic variations and relationships among the SFTSV strains. The genome of CUK-JJ01 was consistent with the genome of other members of the genus Phlebovirus, including the large (L), medium (M), and small (S) segments of 6368, 3378, and 1744 nucleotides, respectively. Based on amino acid sequences of the M and S segments, which are used to distinguish the six SFTSV genotypes, CUK-JJ01 was classified as genotype B. Segment analysis revealed that the L, M, and S segments were 97.49%, 97.18%, and 97.94% similar to those of KAJNH2/2013/ Korea, ZJZHSH-FDE/2012/China, and KADGH/2013/Korea, respectively. Currently, only few studies on SFTSV have been conducted in Korean population and most were limited to serological analysis. Although the present study has limitations in terms of number of sample analyzed, the findings may serve as basis to understand the transmission and spread of SFTSV, as well as for the development of diagnostic and detection methods for viral recombinants by comparing the whole genome sequence of SFTSV isolates from South Korea and that of foreign isolates.

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Circulation of tick-borne pathogens in wildlife of the Republic of Korea
Hye-ryung Byun, Seong-Ryeong Ji, Jun-Gu Kang, Chang-Yong Choi, Ki-Jeong Na, Jong-Taek Kim, Joon-Seok Chae
One Health.2024; 19: 100913. CrossRef
Molecular characterization of the genome of a new bunyavirus isolated in 2023 in Huzhou, China
Shili Song, Zhang Shen, Deshun Xu
Journal of Clinical Virology Plus.2024; 4(3): 100188. CrossRef
Multiple Genotypes and Reassortants of Severe Fever With Thrombocytopenia Syndrome Virus Co‐Circulating in Hangzhou in Southeastern China, 2013–2023
Yanping Wen, Zhimin Ni, Yan Hu, Jun Wu, Yezhen Fang, Guozhong Zhang, Renjie Huang, Shi Cheng, Feifei Cao, Qihao Xu, Yue Yu, Min Liu, Hongnv Yu, Liangliang Huo, Jun Li
Journal of Medical Virology.2024;[Epub] CrossRef
Genetic Diversity, Regional Distribution, and Clinical Characteristics of Severe Fever with Thrombocytopenia Syndrome Virus in Gangwon Province, Korea, a Highly Prevalent Region, 2019–2021
Mi-Young Moon, Hyeon Kyu Kim, Se-Jin Chung, Jae Hwan Byun, Ha-Na Kim, Woan Lee, Soon-Won Lee, Sezim Monoldorova, Sungkyeong Lee, Bo-Young Jeon, Eun-Joo Lim
Microorganisms.2023; 11(9): 2288. CrossRef
Identification of severe fever with thrombocytopenia syndrome virus genotypes in patients and ticks in Liaoning Province, China
Xiao-Hu Han, Yue Ma, Hong-Yan Liu, Dan Li, Yan Wang, Feng-Hua Jiang, Qing-Tian Gao, Feng Jiang, Bao-Shan Liu, Guo-Shun Shen, Ze-Liang Chen
Parasites & Vectors.2022;[Epub] CrossRef
Analysis of cross neutralizing activity of antibodies from sera of severe fever with thrombocytopenia syndrome patients to deal with different genotype strains
Jiaxin Xu, Yuanni Liu, Fan Zhang, Xin Wang, Weijin Huang, Yulong Wu, Boqing Li, Jiapeng Zhuang, Yixing Bing, Youchun Wang, Yuanyuan Qiao
Frontiers in Microbiology.2022;[Epub] CrossRef
Development of a real-time loop-mediated isothermal amplification method for the detection of severe fever with thrombocytopenia syndrome virus
Jae Woong Lee, Yu-Jung Won, Lae Hyung Kang, Sung-Geun Lee, Seung-Won Park, Soon-Young Paik
Journal of Microbiology.2020; 58(8): 711. CrossRef

Research Support, Non-U.S. Gov'ts

Full Sequence Analysis and Characterization of a Human Astrovirus Type 1 Isolate from South Korea: Sung-Geun Lee , Lae-Hyung Kang , Weon-Hwa Jheong , Mi-Hwa Oh , Gyu-Cheol Lee , Sujeong Park , Soon-Young Paik; J. Microbiol. 2013;51(1):123-129. Published online March 2, 2013; DOI: https://doi.org/10.1007/s12275-013-2505-2

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Abstract: Human astroviruses are recognized as an important cause of infantile gastroenteritis around the world. In South Korea, sporadic cases of HAstV infection have been reported since 2002. However, hitherto, there have been no studies reporting the whole genome sequence of an HAstV isolate from South Korea. Hence, we sequenced and analyzed the entire genome of an HAstV-1 strain (lhar) that was isolated in Seoul, South Korea. The whole-genome sequence analysis revealed 3 open reading frames comprising the whole genome: ORF1a (2,763 bp), ORF1b (1,548 bp), and ORF2 (2,364 bp). The lhar strain showed amino acid identities with 8 other reference strains of 87.6–98.7%, 94.2–98.8%, and 62.6–99.0% in the ORF1a, ORF1b, and ORF2 regions, respectively. The amino acid sequence of the capsid region encoded by ORF2 was compared with a total of 19 HAstV-1 strains and 8 HAstVs reference strains isolated in various countries. This revealed 1 amino acid substitution, at aa412 (Pro → Arg) in ORF2. This study, the first to report the fulllength sequence of an HAstV isolated in South Korea, is meaningful in that it can be used as a full-length HAstV sequence standard for future comparison studies. It may also prove useful to the field of public health field by facilitating the diagnosis and the prediction of new emerging variants.

NOTE] Molecular Characterization of Two Strains of Porcine Group C Rotavirus: Sung-Geun Lee , Soo-Hyun Youn , Mi-Hwa Oh , Ok-Jae Rhee , Sangsuk Oh , Soon-Young Paik; J. Microbiol. 2011;49(6):1058-1062. Published online December 28, 2011; DOI: https://doi.org/10.1007/s12275-011-1088-z

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Abstract: Group C rotaviruses are an important cause of acute gastroenteritis in humans and animals. Fecal samples were collected from a porcine herd in July, 2009. Group C rotavirus RNA was detected using RT-PCR for the VP6 gene. The identified strain was further characterized by sequencing and phylogenetic analysis of the partial VP4, and complete VP6 and VP7 gene sequences. The partial VP4 and complete VP6 gene sequences of the CUK-5 strain were most closely related to those of the CUK-6 strain of group C rotaviruses. Phylogenetic analysis of the VP7 gene of the 2 strains (CUK-5 and CUK-6) and reference strains of group G rotavirus by the neighbor-joining method also confirmed that CUK-5 and CUK-6 belonged to type G5 and G1 strains, respectively. This study provides useful data for the prediction of newly appearing variants of porcine group C rotaviruses in neighboring countries through comparisons with GCRVs and fundamental research for vaccine development.

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