Journal of Microbiology

Journal Articles

Effects of Light and Dark Conditions on the Transcriptome of Aging Cultures of Candidatus Puniceispirillum marinum IMCC1322: Ji Hyen Lee, Hyun-Myung Oh; J. Microbiol. 2024;62(4):297-314. Published online April 25, 2024; DOI: https://doi.org/10.1007/s12275-024-00125-0

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Abstract: To elucidate the function of proteorhodopsin in Candidatus Puniceispirillum marinum strain IMCC1322, a cultivated representative of SAR116, we produced RNA-seq data under laboratory conditions. We examined the transcriptomes of six different cultures, including sets of expression changes under constant dark (DD), constant light (LL), and diel-cycled (LD; 14 h light: 10 h dark) conditions at the exponential and stationary/death phases. Prepared mRNA extracted from the six samples was analyzed on the Solexa Genome Analyzer with 36 cycles. Differentially expressed genes on the IMCC1322 genome were distinguished as four clusters by K-mean clustering and each CDS (n = 2546) was annotated based on the KEGG BRITE hierarchy. Cluster 0 (n = 1573) covered most constitutive genes including proteorhodopsin, retinoids, and glycolysis/TCA cycle. Cluster 1 genes (n = 754) were upregulated in stationary/death phase under constant dark conditions and included genes associated with bacterial defense, membrane transporters, nitrogen metabolism, and senescence signaling. Cluster 2 genes (n = 197) demonstrated upregulation in exponential phase cultures and included genes involved in genes for oxidative phosphorylation, translation factors, and transcription machinery. Cluster 3 (n = 22) contained light-stimulated upregulated genes expressed under stationary/phases. Stringent response genes belonged to cluster 2, but affected genes spanned various cellular processes such as amino acids, nucleotides, translation, transcription, glycolysis, fatty acids, and cell wall components. The coordinated expression of antagonistic stringent genes, including mazG, ppx/gppA, and spoT/relA may provide insight into the controlled cultural response observed between constant light and constant dark conditions in IMCC1322 cultures, regardless of cell numbers and biomass.

Heterologous Production and Structure Determination of a New Lanthipeptide Sinosporapeptin Using a Cryptic Gene Cluster in an Actinobacterium Sinosporangium siamense: Keita Saito , Keiichiro Mukai , Issara Kaweewan , Hiroyuki Nakagawa , Takeshi Hosaka , Shinya Kodani; J. Microbiol. 2023;61(6):641-648. Published online June 12, 2023; DOI: https://doi.org/10.1007/s12275-023-00059-z

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Lipolanthine is a subclass of lanthipeptide that has the modification of lipid moiety at the N-terminus. A cryptic biosynthetic gene cluster comprising four genes (sinA, sinKC, sinD, and sinE) involved in the biosynthesis of lipolanthine was identified in the genome of an actinobacterium Sinosporangium siamense. Heterologous coexpression of a precursor peptide coding gene sinA and lanthipeptide synthetase coding gene sinKC in the host Escherichia coli strain BL21(DE3) resulted in the synthesis of a new lanthipeptide, sinosporapeptin. It contained unusual amino acids, including one labionin and two dehydrobutyrine residues, as determined using NMR and MS analyses. Another coexpression experiment with two additional genes of decarboxylase (sinD) and N-acetyl transferase (sinE) resulted in the production of a lipolanthine-like modified sinosporapeptin.

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Heterologous biosynthesis of myxobacterial lanthipeptides melittapeptins
Issara Kaweewan, Keiichiro Mukai, Pratchaya Rukthanapitak, Hiroyuki Nakagawa, Takeshi Hosaka, Shinya Kodani
Applied Microbiology and Biotechnology.2024;[Epub] CrossRef
Facile Method for Determining Lanthipeptide Stereochemistry
Youran Luo, Shuyun Xu, Autumn M. Frerk, Wilfred A. van der Donk
Analytical Chemistry.2024; 96(4): 1767. CrossRef
Antimicrobial Peptides Derived from Bacteria: Classification, Sources, and Mechanism of Action against Multidrug-Resistant Bacteria
Raynichka Mihaylova-Garnizova, Slavena Davidova, Yordan Hodzhev, Galina Satchanska
International Journal of Molecular Sciences.2024; 25(19): 10788. CrossRef

Description of Luteibacter aegosomatis sp. nov., Luteibacter aegosomaticola sp. nov., and Luteibacter aegosomatissinici sp. nov. isolated from the Intestines of Aegosoma sinicum Larvae: Hae-In Joe , Jee-Won Choi , June-Young Lee , Hojun Sung , Su-Won Jeong , Yun-Seok Jeong , Jae-Yun Lee , Jin-Woo Bae; J. Microbiol. 2023;61(6):603-613. Published online May 5, 2023; DOI: https://doi.org/10.1007/s12275-023-00051-7

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Abstract

Three novel bacterial strains, 321T, 335T, and 353T, were isolated from the intestines of Aegosoma sinicum larvae collected from Paju-Si, South Korea. The strains were Gram-negative, obligate aerobe and had rod-shaped cells with a single flagellum. The three strains belonged to the genus Luteibacter in the family Rhodanobacteraceae and shared < 99.2% similarity in their 16S rRNA gene sequence and < 83.56% similarity in thier whole genome sequence. Strains 321T, 335T, and 353T formed a monophyletic clade with Luteibacter yeojuensis KACC 11405T, L. anthropi KACC 17855T, and L. rhizovicinus KACC 12830T, with sequence similarities of 98.77–98.91%, 98.44–98.58%, and 97.88–98.02%, respectively. Further genomic analyses, including the construction of the Up-to-date Bacterial Core Gene (UBCG) tree and assessment of other genome-related indices, indicated that these strains were novel species belonging to the genus Luteibacter. All three strains contained ubiquinone Q8 as their major isoprenoid quinone and iso-C15:0 and summed feature 9 ( C16:0 10-methyl and/or iso-C17:1 ω9c) as their major cellular fatty acids. Phosphatidylethanolamine and diphosphatidylglycerol were the major polar lipids in all the strains. The genomic DNA G + C contents of strains 321T, 335T, and 353T were 66.0, 64.5, and 64.5 mol%, respectively. Based on multiphasic classification, strains 321T, 335T, and 353T were classified into the genus Luteibacter as the type strains of novel species, for which the names Luteibacter aegosomatis sp. nov., Luteibacter aegosomaticola sp. nov., and Luteibacter aegosomatissinici sp. nov. are proposed, respectively.

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Luteibacter sahnii sp. nov., A Novel Yellow-Colored Xanthomonadin Pigment Producing Probiotic Bacterium from Healthy Rice Seed Microbiome
Gagandeep Jaiswal, Rekha Rana, Praveen Kumar Nayak, Rekha Chouhan, Sumit G. Gandhi, Hitendra K. Patel, Prabhu B. Patil
Current Microbiology.2024;[Epub] 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

Identification and Characterization of HEPN‑MNT Type II TA System from Methanothermobacter thermautotrophicus ΔH: Wonho Choi , Anoth Maharjan , Hae Gang Im , Ji-Young Park , Jong-Tae Park , Jung-Ho Park; J. Microbiol. 2023;61(4):411-421. Published online April 18, 2023; DOI: https://doi.org/10.1007/s12275-023-00041-9

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Abstract

Toxin-antitoxin (TA) systems are widespread in bacteria and archaea plasmids and genomes to regulate DNA replication, gene transcr!ption, or protein translation. Higher eukaryotic and prokaryotic nucleotide-binding (HEPN) and minimal nucleotidyltransferase (MNT) domains are prevalent in prokaryotic genomes and constitute TA pairs. However, three gene pairs (MTH304/305, 408/409, and 463/464) of Methanothermobacter thermautotropicus ΔH HEPN-MNT family have not been studied as TA systems. Among these candidates, our study characterizes the MTH463/MTH464 TA system. MTH463 expression inhibited Escherichia coli growth, whereas MTH464 did not and blocked MTH463 instead. Using site-directed MTH463 mutagenesis, we determined that amino acids R99G, H104A, and Y106A from the R[ɸX]4-6H motif are involved with MTH463 cell toxicity. Furthermore, we established that purified MTH463 could degrade MS2 phage RNA, whereas purified MTH464 neutralized MTH463 activity in vitro. Our results indicate that the endonuclease toxin MTH463 (encoding a HEPN domain) and its cognate antitoxin MTH464 (encoding the MNT domain) may act as a type II TA system in M. thermautotropicus ΔH. This study provides initial and essential information studying TA system functions, primarily archaea HEPN-MNT family.

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Extensive Genomic Rearrangement of Catalase-Less Cyanobloom-Forming Microcystis aeruginosa in Freshwater Ecosystems
Minkyung Kim, Jaejoon Jung, Wonjae Kim, Yerim Park, Che Ok Jeon, Woojun Park
Journal of Microbiology.2024; 62(11): 933. CrossRef

Review

Mycobacterial Regulatory Systems Involved in the Regulation of Gene Expression Under Respiration‑Inhibitory Conditions: Yuna Oh , Ha-Na Lee , Eon-Min Ko , Ji-A Jeong , Sae Woong Park , Jeong-Il Oh; J. Microbiol. 2023;61(3):297-315. Published online February 27, 2023; DOI: https://doi.org/10.1007/s12275-023-00026-8

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Abstract

Mycobacterium tuberculosis is the causative agent of tuberculosis. M. tuberculosis can survive in a dormant state within the granuloma, avoiding the host-mounting immune attack. M. tuberculosis bacilli in this state show increased tolerance to antibiotics and stress conditions, and thus the transition of M. tuberculosis to the nonreplicating dormant state acts as an obstacle to tuberculosis treatment. M. tuberculosis in the granuloma encounters hostile environments such as hypoxia, nitric oxide, reactive oxygen species, low pH, and nutrient deprivation, etc., which are expected to inhibit respiration of M. tuberculosis. To adapt to and survive in respiration-inhibitory conditions, it is required for M. tuberculosis to reprogram its metabolism and physiology. In order to get clues to the mechanism underlying the entry of M. tuberculosis to the dormant state, it is important to understand the mycobacterial regulatory systems that are involved in the regulation of gene expression in response to respiration inhibition. In this review, we briefly summarize the information regarding the regulatory systems implicated in upregulation of gene expression in mycobacteria exposed to respiration-inhibitory conditions. The regulatory systems covered in this review encompass the DosSR (DevSR) two-component system, SigF partner switching system, MprBA-SigE-SigB signaling pathway, cAMP receptor protein, and stringent response.

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Host Immune Pathways to Mycobacterium tuberculosis Infection
Eun-Jin Park, Insoo Kim, Eun-Kyeong Jo
Journal of Bacteriology and Virology.2024; 54(3): 167. CrossRef
Bacterial Regulatory Mechanisms for the Control of Cellular Processes: Simple Organisms’ Complex Regulation
Jin-Won Lee
Journal of Microbiology.2023; 61(3): 273. CrossRef

Journal Article

Transcriptome‑based Mining of the Constitutive Promoters for Tuning Gene Expression in Aspergillus oryzae: Kobkul Laoteng , Jutamas Anantayanon , Chanikul Chutrakul , Sarocha Panchanawaporn , Sukanya Jeennor; J. Microbiol. 2023;61(2):199-210. Published online February 6, 2023; DOI: https://doi.org/10.1007/s12275-023-00020-0

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Abstract

Transcriptional regulation has been adopted for developing metabolic engineering tools. The regulatory promoter is a crucial genetic element for strain optimization. In this study, a gene set of Aspergillus oryzae with highly constitutive expression across different growth stages was identified through transcriptome data analysis. The candidate promoters were functionally characterized in A. oryzae by transcriptional control of β-glucuronidase (GUS) as a reporter. The results showed that the glyceraldehyde triphosphate dehydrogenase promoter (PgpdA1) of A. oryzae with a unique structure displayed the most robust strength in constitutively controlling the expression compared to the PgpdA2 and other putative promoters tested. In addition, the ubiquitin promoter (Pubi) of A. oryzae exhibited a moderate expression strength. The deletion analysis revealed that the 5' untranslated regions of gpdA1 and ubi with the length of 1028 and 811 nucleotides, counted from the putative translation start site (ATG), respectively, could efficiently drive the GUS expression. Interestingly, both promoters could function on various carbon sources for cell growth. Glucose was the best fermentable carbon source for allocating high constitutive expressions during cell growth, and the high concentrations (6–8% glucose, w/v) did not repress their functions. It was also demonstrated that the secondary metabolite gene coding for indigoidine could express under the control of PgpdA1 or Pubi promoter. These strong and moderate promoters of A. oryzae provided beneficial options in tuning the transcriptional expression for leveraging the metabolic control towards the targeted products.

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Construction of an Aspergillus oryzae △nptB△pyrG Host for Homologous Expression of Lipase and Catalytic Property Characterization of Recombinant Lipase
Yueting Zhang, Hongmei Nie, Fei Zhang, Mengmeng Jin, Zhao Wang, Jianyong Zheng
Applied Biochemistry and Biotechnology.2024;[Epub] CrossRef
Mining and Understanding of New Transcriptional Regulatory Elements from Licorice-Derived Endophyte Serratia Rubidaea W12-1
Ying Zhang, Yunyang Ma, Bing Hu, H.M. Zabed, A.K. Singh, M.A. Ibrahim, N. Chen
BIO Web of Conferences.2024; 142: 03018. CrossRef
Exploring and Engineering Novel Strong Promoters for High-Level Protein Expression in Bacillus subtilis DB104 through Transcriptome Analysis
Ji-Su Jun, Hyang-Eun Jeong, Kwang-Won Hong
Microorganisms.2023; 11(12): 2929. 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

Review

Coronavirus enzyme inhibitors-experimentally proven natural compounds from plants: Junsoo Park , Rackhyun Park , Minsu Jang , Yea-In Park , Yeonjeong Park; J. Microbiol. 2022;60(3):347-354. Published online January 28, 2022; DOI: https://doi.org/10.1007/s12275-022-1499-z

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Abstract

Coronavirus disease (COVID-19) can cause critical conditions that require efficient therapeutics. Several medicines are derived from plants, and researchers are seeking natural compounds to ameliorate the symptoms of COVID-19. Viral enzymes are popular targets of antiviral medicines; the genome of coronaviruses encodes several enzymes, including RNAdependent RNA polymerase and viral proteases. Various screening systems have been developed to identify potential inhibitors. In this review, we describe the natural compounds that have been shown to exert inhibitory effects on coronavirus enzymes. Although computer-aided molecular structural studies have predicted several antiviral compound candidates, the current review focuses on experimentally proven natural compounds.

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Eupatin, a Flavonoid, Inhibits Coronavirus 3CL Protease and Replication
Yea-In Park, Jang Hoon Kim, Siyun Lee, Ik Soo Lee, Junsoo Park
International Journal of Molecular Sciences.2023; 24(11): 9211. CrossRef
Structural Insights into Plasticity and Discovery of Flavonoid Allosteric Inhibitors of Flavivirus NS2B–NS3 Protease
Marielena Vogel Saivish, Gabriela de Lima Menezes, Vivaldo Gomes da Costa, Liliane Nebo, Gislaine Celestino Dutra da Silva, Carolina Colombelli Pacca, Rafael Elias Marques, Maurício Lacerda Nogueira, Roosevelt Alves Da Silva
Biophysica.2023; 3(1): 71. CrossRef
Plants as Biofactories for Therapeutic Proteins and Antiviral Compounds to Combat COVID-19
Corbin England, Jonathan TrejoMartinez, Paula PerezSanchez, Uddhab Karki, Jianfeng Xu
Life.2023; 13(3): 617. CrossRef
Computational investigation of natural compounds as potential main protease (Mpro) inhibitors for SARS-CoV-2 virus
Chirag N. Patel, Siddhi P. Jani, Sivakumar Prasanth Kumar, Krunal M. Modi, Yogesh Kumar
Computers in Biology and Medicine.2022; 151: 106318. CrossRef
Two years of COVID-19 pandemic: where are we now?
Jinjong Myoung
Journal of Microbiology.2022; 60(3): 235. CrossRef
Identification of SARS-CoV-2 Main Protease Inhibitors from a Library of Minor Cannabinoids by Biochemical Inhibition Assay and Surface Plasmon Resonance Characterized Binding Affinity
Chang Liu, Tess Puopolo, Huifang Li, Ang Cai, Navindra P. Seeram, Hang Ma
Molecules.2022; 27(18): 6127. CrossRef
Computational Approaches in the Discovery and Development of Therapeutic and Prophylactic Agents for Viral Diseases
Anand Gaurav, Neetu Agrawal, Mayasah Al-Nema, Vertika Gautam
Current Topics in Medicinal Chemistry.2022; 22(26): 2190. CrossRef

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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Abstract

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

Zinc-binding domain mediates pleiotropic functions of Yvh1 in Cryptococcus neoformans: Jae-Hyung Jin , Myung Kyung Choi , Hyun-Soo Cho , Yong-Sun Bahn; J. Microbiol. 2021;59(7):658-665. Published online July 1, 2021; DOI: https://doi.org/10.1007/s12275-021-1287-1

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Abstract: Yvh1 is a dual-specificity phosphatase (DUSP) that is evolutionarily conserved in eukaryotes, including yeasts and humans. Yvh1 is involved in the vegetative growth, differentiation, and virulence of animal and plant fungal pathogens. All Yvh1 orthologs have a conserved DUSP catalytic domain at the N-terminus and a zinc-binding (ZB) domain with two zinc fingers (ZFs) at the C-terminus. Although the DUSP domain is implicated in the regulation of MAPK signaling in humans, only the ZB domain is essential for most cellular functions of Yvh1 in fungi. This study aimed to analyze the functions of the DUSP and ZB domains of Yvh1 in the human fungal pathogen Cryptococcus neoformans, whose Yvh1 (CnYvh1) contains a DUSP domain at the C-terminus and a ZB domain at the N-terminus. Notably, CnYvh1 has an extended internal domain between the two ZF motifs in the ZB domain. To elucidate the function of each domain, we constructed individual domain deletions and swapping strains by complementing the yvh1Δ mutant with wild-type (WT) or mutated YVH1 alleles and examined their Yvh1-dependent phenotypes, including growth under varying stress conditions, mating, and virulence factor production. Here, we found that the complementation of the yvh1Δ mutant with the mutated YVH1 alleles having two ZFs of the ZB domain, but not the DUSP and extended internal domains, restored the WT phenotypic traits in the yvh1Δ mutant. In conclusion, the ZB domain, but not the N-terminal DUSP domain, plays a pivotal role in the pathobiological functions of cryptococcal Yvh1.

Extracellular products-mediated interspecific interaction between Pseudomonas aeruginosa and Escherichia coli: Yang Yuan , Jing Li , Jiafu Lin , Wenjuan Pan , Yiwen Chu , Balakrishnan Prithiviraj , Yidong Guo , Xinrong Wang , Kelei Zhao; J. Microbiol. 2021;59(1):29-40. Published online December 23, 2020; DOI: https://doi.org/10.1007/s12275-021-0478-0

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Abstract

The Gram-negative pathogen Pseudomonas aeruginosa adopts several elaborate strategies to colonize a wide range of natural or clinical niches and to overcome the neighboring bacterial competitors in polymicrobial communities. However, the relationship and interaction mechanism of P. aeruginosa with other bacterial pathogens remains largely unexplored. Here we explore the interaction dynamics of P. aeruginosa and Escherichia coli, which frequently coinfect the lungs of immunocompromised hosts, by using a series of on-plate proximity assays and RNA-sequencing. We show that the extracellular products of P. aeruginosa can inhibit the growth of neighboring E. coli and induce a large-scale of transcriptional reprogramming of E. coli, especially in terms of cellular respiration- related primary metabolisms and membrane components. In contrast, the presence of E. coli has no significant effect on the growth of P. aeruginosa in short-term culture, but causes a dysregulated expression of genes positively controlled by the quorum-sensing (QS) system of P. aeruginosa during subsequent pairwise culture. We further demonstrate that the divergent QS-regulation of P. aeruginosa may be related to the function of the transcriptional regulator PqsR, which can be enhanced by E. coli culture supernatant to increase the pyocyanin production by P. aeruginosa in the absence of the central las-QS system. Moreover, the extracellular products of E. coli promote the proliferation and lethality of P. aeruginosa in infecting the Caenorhabditis elegans model. The current study provides a general characterization of the extracellular products-mediated interactions between P. aeruginosa and E. coli, and may facilitate the understanding of polymicrobial infections.

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Pigments from pathogenic bacteria: a comprehensive update on recent advances
Kusumita Acharya, Swarna Shaw, Sudipta Paul Bhattacharya, Shatarupa Biswas, Suman Bhandary, Arijit Bhattacharya
World Journal of Microbiology and Biotechnology.2024;[Epub] CrossRef
Selective detection of two bacterial species in a single collision system targeting metabolic products
Jun Lin, Qingwen Wang, Huike Tian, Qing Xin, Dong Zhang
Microchemical Journal.2024; 206: 111572. CrossRef
Effect of the Type VI Secretion System Secreted Protein Hcp on the Virulence of Aeromonas salmonicida
Hongyan Cai, Jiaying Yu, Ying Qiao, Ying Ma, Jiang Zheng, Mao Lin, Qingpi Yan, Lixing Huang
Microorganisms.2022; 10(12): 2307. CrossRef

A histone deacetylase, MoHOS2 regulates asexual development and virulence in the rice blast fungus: Jongjune Lee , Jae-Joon Lee , Junhyun Jeon; J. Microbiol. 2019;57(12):1115-1125. Published online November 22, 2019; DOI: https://doi.org/10.1007/s12275-019-9363-5

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Abstract

Histone acetylation/deacetylation represent a general and efficient epigenetic mechanism through which fungal cells control gene expression. Here we report developmental requirement of MoHOS2-mediated histone deacetylation (HDAC) for the rice blast fungus, Magnaporthe oryzae. Structural similarity and nuclear localization indicated that MoHOS2 is an ortholog of Saccharomyces cerevisiae Hos2, which is a member of class I histone deacetylases and subunit of Set3 complex. Deletion of MoHOS2 led to 25% reduction in HDAC activity, compared to the wild-type, confirming that it is a bona-fide HDAC. Lack of MoHOS2 caused decrease in radial growth and impinged dramatically on asexual sporulation. Such reduction in HDAC activity and phenotypic defects of ΔMohos2 were recapitulated by a single amino acid change in conserved motif that is known to be important for HDAC activity. Expression analysis revealed up-regulation of MoHOS2 and concomitant down-regulation of some of the key genes involved in asexual reproduction under sporulation-promoting condition. In addition, the deletion mutant exhibited defect in appressorium formation from both germ tube tip and hyphae. As a result, ΔMohos2 was not able to cause disease symptoms. Wound-inoculation showed that the mutant is compromised in its ability to grow inside host plants as well. We found that some of ROS detoxifying genes and known effector genes are de-regulated in the mutant. Taken together, our data suggest that MoHOS2-dependent histone deacetylation is pivotal for proper timing and induction of transcription of the genes that coordinate developmental changes and host infection in M. oryzae.

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Glsirt1-mediated deacetylation of GlCAT regulates intracellular ROS levels, affecting ganoderic acid biosynthesis in Ganoderma lucidum
Jing Han, Lingshuai Wang, Xin Tang, Rui Liu, Liang Shi, Jing Zhu, Mingwen Zhao
Free Radical Biology and Medicine.2024; 216: 1. CrossRef
Histone (de)acetylation in epigenetic regulation of Phytophthora pathobiology
Yufeng Guan, Joanna Gajewska, Jolanta Floryszak‐Wieczorek, Umesh Kumar Tanwar, Ewa Sobieszczuk‐Nowicka, Magdalena Arasimowicz‐Jelonek
Molecular Plant Pathology.2024;[Epub] CrossRef
FolSas2 is a regulator of early effector gene expression during Fusarium oxysporum infection
Limin Song, Yalei Wang, Fahui Qiu, Xiaoxia Li, Jingtao Li, Wenxing Liang
New Phytologist.2024;[Epub] CrossRef
Regulatory roles of epigenetic modifications in plant-phytopathogen interactions
Zeng Tao, Fei Yan, Matthias Hahn, Zhonghua Ma
Crop Health.2023;[Epub] CrossRef
The additional PRC2 subunit and Sin3 histone deacetylase complex are required for the normal distribution of H3K27me3 occupancy and transcriptional silencing in Magnaporthe oryzae
Chuyu Lin, Zhongling Wu, Huanbin Shi, Jinwei Yu, Mengting Xu, Fucheng Lin, Yanjun Kou, Zeng Tao
New Phytologist.2022; 236(2): 576. CrossRef
Regulatory Roles of Histone Modifications in Filamentous Fungal Pathogens
Yiling Lai, Lili Wang, Weilu Zheng, Sibao Wang
Journal of Fungi.2022; 8(6): 565. CrossRef
Polycomb Repressive Complex 2-Mediated H3K27 Trimethylation Is Required for Pathogenicity in Magnaporthe oryzae
Zhongling Wu, Jiehua Qiu, Huanbin Shi, Chuyu Lin, Jiangnan Yue, Zhiquan Liu, Wei Xie, Naweed I. Naqvi, Yanjun Kou, Zeng Tao
Rice Science.2022; 29(4): 363. CrossRef
Protein acetylation and deacetylation in plant‐pathogen interactions
Jing Wang, Chao Liu, Yun Chen, Youfu Zhao, Zhonghua Ma
Environmental Microbiology.2021; 23(9): 4841. CrossRef
Emerging Roles of Posttranslational Modifications in Plant-Pathogenic Fungi and Bacteria
Wende Liu, Lindsay Triplett, Xiao-Lin Chen
Annual Review of Phytopathology.2021; 59(1): 99. CrossRef
Fungal Lysine Deacetylases in Virulence, Resistance, and Production of Small Bioactive Compounds
Ingo Bauer, Stefan Graessle
Genes.2021; 12(10): 1470. CrossRef
A Histone Deacetylase, Magnaporthe oryzae RPD3, Regulates Reproduction and Pathogenic Development in the Rice Blast Fungus
Song Hee Lee, Mohamed El-Agamy Farh, Jaejoon Lee, Young Taek Oh, Eunbyeol Cho, Jiyeun Park, Hokyoung Son, Junhyun Jeon, Antonio Di Pietro
mBio.2021;[Epub] CrossRef
The Histone Deacetylases MoRpd3 and MoHst4 Regulate Growth, Conidiation, and Pathogenicity in the Rice Blast Fungus Magnaporthe oryzae
Chaoxiang Lin, Xue Cao, Ziwei Qu, Shulin Zhang, Naweed I. Naqvi, Yi Zhen Deng, Aaron P. Mitchell
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Histone Acetyltransferases and Deacetylases Are Required for Virulence, Conidiation, DNA Damage Repair, and Multiple Stresses Resistance of Alternaria alternata
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Increase in the genetic polymorphism of varicella-zoster virus after passaging in in vitro cell culture: Hye Rim Hwang , Seok Cheon Kim , Se Hwan Kang , Chan Hee Lee; J. Microbiol. 2019;57(11):1033-1039. Published online October 28, 2019; DOI: https://doi.org/10.1007/s12275-019-9429-4

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Abstract

Primary infections with the varicella-zoster virus (VZV) result in varicella, while latent reactivation leads to herpes zoster. Both varicella and zoster can be prevented by live attenuated vaccines. There have been reports suggesting that both clinical VZV strains and those in vaccine preparations are genetically polymorphic, containing mixtures of both wild-type and vaccine-type sequences at certain vaccine-specific sites. In this study, the genetic polymorphism of the VZV genome was examined by analyzing the frequencies of minor alleles at each nucleotide position. Next-generation sequencing of the clinical VZV strain YC02 passaged in an in vitro cell culture was used to identify genetically polymorphic sites (GPS), where the minor allele frequency (MAF) exceeded 5%. The number of GPS increased by 7.3-fold at high passages (p100) when compared to low passages (p17), although the average MAF remained similar. GPS were found in 6 open reading frames (ORFs) in p17, 35, and 54 ORFs in p60 and p100, respectively. GPS were found more frequently in the dispensable gene group than the essential gene group, but the average MAF was greater in the essential gene group. The most common two major/minor base pairs were A/g and T/c. GPS were found in all three passages at 16 positions, all located in the reiterated (R) region. The population diversity as measured by Shannon entropy increased in p60 and p100. However, the entropy remained unchanged in the R regions.

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Genetic changes in plaque-purified varicella vaccine strain Suduvax during in vitro propagation in cell culture
Hye Rim Hwang, Se Hwan Kang, Chan Hee Lee
Journal of Microbiology.2021; 59(7): 702. CrossRef
Genetic diversity through social heterosis can increase virulence in RNA viral infections and cancer progression
Saba Ebrahimi, Peter Nonacs
Royal Society Open Science.2021;[Epub] CrossRef

Kinetic characterization of laccase from Bacillus atrophaeus, and its potential in juice clarification in free and immobilized forms: Lokesh Kumar Narnoliya , Neera Agarwal , Satya N. Patel , Sudhir P. Singh; J. Microbiol. 2019;57(10):900-909. Published online August 28, 2019; DOI: https://doi.org/10.1007/s12275-019-9170-z

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Abstract

In the present study, a laccase gene (BaLc) from a lignin degrading bacterium, Bacillus atrophaeus, has been cloned and expressed in Escherichia coli. The optimal catalytic activity of the protein was achieved at 5.5 pH and 35°C temperature, measured by oxidation of ABTS. The Km and Vmax values were determined as 1.42 mM and 4.16 μmole/min, respectively. To achieve the enzyme recovery, the biocatalyst (BaLc) was covalently attached onto the functionalized iron magnetic-nanoparticles. The nanoparticles were characterized by zeta-potential and FTIR analyses. The immobilized BaLc enzyme was physico-kinetically characterized, exhibiting retention of 60% of the residual activity after ten reaction cycles of ABTS oxidation. The immobilized biocatalyst system was tested for its biotechnological exploitability in plant juice processing, achieving 41–58% of phenol reduction, 41–58% decolorization, 50–59% turbidity reduction in the extracts of banana pseudo-stem and sweet sorghum stalk, and apple fruit juice. This is the first study to demonstrate the use of nanoparticle- laccase conjugate in juice clarification. The findings suggest that B. atrophaus laccase is a potential catalytic tool for plant juice bioprocessing activities.

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Immobilized enzymes: exploring its potential in food industry applications
K. A. Jothyswarupha, Swethaa Venkataraman, Devi Sri Rajendran, S. S. Sakthi Shri, Shivani Sivaprakasam, Tholeti Yamini, P. Karthik, Vaidyanathan Vinoth Kumar
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Laccase-mediated degradation of emerging contaminants: unveiling a sustainable solution
Pooja Thathola, Elda M. Melchor-Martínez, Priyanka Adhikari, Saúl Antonio Hernández Martínez, Anita Pandey, Roberto Parra-Saldívar
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Biochemical Characteristics of Laccases and Their Practical Application in the Removal of Xenobiotics from Water
Agnieszka Gałązka, Urszula Jankiewicz, Andrzej Szczepkowski
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Application of Immobilized Enzymes in Juice Clarification
Feng Wang, Hui Xu, Miaomiao Wang, Xiaolei Yu, Yi Cui, Ling Xu, Anzhou Ma, Zhongyang Ding, Shuhao Huo, Bin Zou, Jingya Qian
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Bacterial Laccases as Biocatalysts for the Remediation of Environmental Toxic Pollutants: A Green and Eco-Friendly Approach—A Review
Neha Agarwal, Vijendra Singh Solanki, Amel Gacem, Mohd Abul Hasan, Brijesh Pare, Amrita Srivastava, Anupama Singh, Virendra Kumar Yadav, Krishna Kumar Yadav, Chaigoo Lee, Wonjae Lee, Sumate Chaiprapat, Byong-Hun Jeon
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Joanne Yi Hui Toy, Yuyun Lu, Dejian Huang, Keisuke Matsumura, Shao-Quan Liu
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Lulu Lei, Xiaoyu Yang, Yudong Song, Hui Huang, Yongxin Li
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Sadia Noreen, Muhammad Asgher, Sarmad Ahmad Qamar, Muhammad Bilal, Hafiz M. N. Iqbal
Catalysis Letters.2022; 152(6): 1869. CrossRef
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Asghar Taheri-Kafrani, Sara Kharazmi, Mahmoud Nasrollahzadeh, Asieh Soozanipour, Fatemeh Ejeian, Parisa Etedali, Hajar-Alsadat Mansouri-Tehrani, Amir Razmjou, Samaneh Mahmoudi-Gom Yek, Rajender S. Varma
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Laccases in food processing: Current status, bottlenecks and perspectives
Emanueli Backes, Camila Gabriel Kato, Rúbia Carvalho Gomes Corrêa, Regina de Fátima Peralta Muniz Moreira, Rosely Aparecida Peralta, Lillian Barros, Isabel C.F.R. Ferreira, Gisella Maria Zanin, Adelar Bracht, Rosane Marina Peralta
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Peter Adewale, Alice Lang, Fang Huang, Daochen Zhu, Jianzhong Sun, Michael Ngadi, Trent Chunzhong Yang
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Tatiane Brugnari, Dayane Moreira Braga, Camila Souza Almeida dos Santos, Bruno Henrique Czelusniak Torres, Tatiani Andressa Modkovski, Charles Windson Isidoro Haminiuk, Giselle Maria Maciel
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Isolation, cultivation, and genome analysis of proteorhodopsincontaining SAR116-clade strain Candidatus Puniceispirillum marinum IMCC1322: Junhak Lee , Kae Kyoung Kwon , Seung-Il Lim , Jaeho Song , Ah Reum Choi , Sung-Hyun Yang , Kwang-Hwan Jung , Jung-Hyun Lee , Sung Gyun Kang , Hyun-Myung Oh , Jang-Cheon Cho; J. Microbiol. 2019;57(8):676-687. Published online June 14, 2019; DOI: https://doi.org/10.1007/s12275-019-9001-2

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Abstract

Strain IMCC1322 was isolated from a surface water sample from the East Sea of Korea. Based on 16S rRNA analysis, IMCC1322 was found to belong to the OCS28 sub-clade of SAR116. The cells appeared as short vibrioids in logarithmicphase culture, and elongated spirals during incubation with mitomycin or in aged culture. Growth characteristics of strain IMCC1322 were further evaluated based on genomic information; proteorhodopsin (PR), carbon monoxide dehydrogenase, and dimethylsulfoniopropionate (DMSP)-utilizing enzymes. IMCC1322 PR was characterized as a functional retinylidene protein that acts as a light-driven proton pump in the cytoplasmic membrane. However, the PR-dependent phototrophic potential of strain IMCC1322 was only observed under CO-inhibited and nutrient-limited culture conditions. A DMSP-enhanced growth response was observed in addition to cultures grown on C1 compounds like methanol, formate, and methane sulfonate. Strain IMCC1322 cultivation analysis revealed biogeochemical processes characteristic of the SAR116 group, a dominant member of the microbial community in euphotic regions of the ocean. The polyphasic taxonomy of strain IMCC1322 is given as Candidatus Puniceispirillum marinum, and was confirmed by chemotaxonomic tests, in addition to 16S rRNA phylogeny and cultivation analyses.

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Effects of Light and Dark Conditions on the Transcriptome of Aging Cultures of Candidatus Puniceispirillum marinum IMCC1322
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Shan-Hui Li, Jaeho Song, Ilnam Kang, Juchan Hwang, Jang-Cheon Cho
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Konstantinos T. Konstantinidis, Ramon Rosselló‐Móra, Rudolf Amann
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Nano-encapsulation of naringinase produced by Trichoderma longibrachiatum ATCC18648 on thermally stable biopolymers for citrus juice debittering: Manal M. Housseiny , Heba I. Aboelmagd; J. Microbiol. 2019;57(6):521-531. Published online May 27, 2019; DOI: https://doi.org/10.1007/s12275-019-8528-6

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Abstract

Characteristics of naringinase nano-encapsulated forms on different carrier materials (chitosan and alginate polymers) were investigated in this study. Screening of twelve fungal isolates for naringinase production indicated that Trichoderma longibrachiatum was the most promising. Grapefruit rind was used as a substrate containing naringin for naringinase production. TEM micrographs showed that chitosan nano-capsules were applied for the production of morphologically homogeneous enzymatic nano-particles with high enzyme encapsulation efficiency, small asymmetric sizes (from 15.09 to 27.07 nm with the mean of 21.8 nm) and rough surfaces compared to nano-encapsulated naringinase in alginate which showed nano-particle size (from 33.37 to 51.01 nm with the mean of 43.03 nm). It was revealed that the highest naringinase activity was found in case of chitosan nano-capsule naringinase compared to alginate nano-capsule one. Thermogram analysis (TGA) showed that the free enzyme loses about 92% of its weight at approximately 110°C, while the nanoencapsulated ones show more stability at higher temperatures. Conclusively, the nano-capsulation process improves the kinetics and operational stability so could be useful as a debittering agent for various thermal processing applications in citrus juices industries which makes the fruit juice more acceptable and cost-effective to the consumer.

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Preparation of Aspergillus niger 426 naringinases for debittering citrus juice utilization of agro-industrial residues
Fernanda de Oliveira, Tereza Cristina Luque Castellane, Marcelo Rodrigues de Melo, João Batista Buzato
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Biotechnology Advances.2021; 51: 107738. CrossRef
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Polymers.2021; 13(23): 4061. CrossRef

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