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The most viewed articles in the last three months among those published since 2023.

Reviews
Advancements in dengue vaccines: A historical overview and pro-spects for following next-generation candidates
Kai Yan, Lingjing Mao, Jiaming Lan, Zhongdang Xiao
J. Microbiol. 2025;63(2):e2410018.   Published online February 27, 2025
DOI: https://doi.org/10.71150/jm.2410018
  • 2,808 View
  • 226 Download
  • 1 Web of Science
  • 1 Crossref
AbstractAbstract PDF

Dengue, caused by four serotypes of dengue viruses (DENV-1 to DENV-4), is the most prevalent and widely mosquito-borne viral disease affecting humans. Dengue virus (DENV) infection has been reported in over 100 countries, and approximately half of the world's population is now at risk. The paucity of universally licensed DENV vaccines highlights the urgent need to address this public health concern. Action and attention to antibody-dependent enhancement increase the difficulty of vaccine development. With the worsening dengue fever epidemic, Dengvaxia® (CYD-TDV) and Qdenga® (TAK-003) have been approved for use in specific populations in affected areas. However, these vaccines do not provide a balanced immune response to all four DENV serotypes and the vaccination cannot cover all populations. There is still a need to develop a safe, broad-spectrum, and effective vaccine to address the increasing number of dengue cases worldwide. This review provides an overview of the existing DENV vaccines, as well as potential candidates for future studies on DENV vaccine development, and discusses the challenges and possible solutions in the field.

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  • Role of c-ABL in DENV-2 Infection and Actin Remodeling in Vero Cells
    Grace Paola Carreño-Flórez, Alexandra Milena Cuartas-López, Ryan L. Boudreau, Miguel Vicente-Manzanares, Juan Carlos Gallego-Gómez
    International Journal of Molecular Sciences.2025; 26(9): 4206.     CrossRef
Progress and challenges in CRISPR/Cas applications in microalgae
Quynh-Giao Tran, Trang Thi Le, Dong-Yun Choi, Dae-Hyun Cho, Jin-Ho Yun, Hong Il Choi, Hee-Sik Kim, Yong Jae Lee
J. Microbiol. 2025;63(3):e2501028.   Published online March 28, 2025
DOI: https://doi.org/10.71150/jm.2501028
  • 1,650 View
  • 82 Download
  • 1 Web of Science
  • 2 Crossref
AbstractAbstract PDF

Clustered Regularly Interspaced Short Palindromic Repeats (CRISPR) technologies have emerged as powerful tools for precise genome editing, leading to a revolution in genetic research and biotechnology across diverse organisms including microalgae. Since the 1950s, microalgal production has evolved from initial cultivation under controlled conditions to advanced metabolic engineering to meet industrial demands. However, effective genetic modification in microalgae has faced significant challenges, including issues with transformation efficiency, limited target selection, and genetic differences between species, as interspecies genetic variation limits the use of genetic tools from one species to another. This review summarized recent advancements in CRISPR systems applied to microalgae, with a focus on improving gene editing precision and efficiency, while addressing organism-specific challenges. We also discuss notable successes in utilizing the class 2 CRISPR-associated (Cas) proteins, including Cas9 and Cas12a, as well as emerging CRISPR-based approaches tailored to overcome microalgal cellular barriers. Additionally, we propose future perspectives for utilizing CRISPR/Cas strategies in microalgal biotechnology.

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  • Advancing microbial engineering through synthetic biology
    Ki Jun Jeong
    Journal of Microbiology.2025; 63(3): e2503100.     CrossRef
  • Progress and prospects in metabolic engineering approaches for isoprenoid biosynthesis in microalgae
    Sonia Mohamadnia, Borja Valverde-Pérez, Omid Tavakoli, Irini Angelidaki
    Biotechnology for Biofuels and Bioproducts.2025;[Epub]     CrossRef
Protocol
A guide to genome mining and genetic manipulation of biosynthetic gene clusters in Streptomyces
Heonjun Jeong, YeonU Choe, Jiyoon Nam, Yeon Hee Ban
J. Microbiol. 2025;63(4):e2409026.   Published online April 29, 2025
DOI: https://doi.org/10.71150/jm.2409026
  • 1,266 View
  • 47 Download
AbstractAbstract PDF

Streptomyces are a crucial source of bioactive secondary metabolites with significant clinical applications. Recent studies of bacterial and metagenome-assembled genomes have revealed that Streptomyces harbors a substantial number of uncharacterized silent secondary metabolite biosynthetic gene clusters (BGCs). These BGCs represent a vast diversity of biosynthetic pathways for natural product synthesis, indicating significant untapped potential for discovering new metabolites. To exploit this potential, genome mining using comprehensive strategies that leverage extensive genomic databases can be conducted. By linking BGCs to their encoded products and integrating genetic manipulation techniques, researchers can greatly enhance the identification of new secondary metabolites with therapeutic relevance. In this context, we present a step-by-step guide for using the antiSMASH pipeline to identify secondary metabolite-coding BGCs within the complete genome of a novel Streptomyces strain. This protocol also outlines gene manipulation methods that can be applied to Streptomyces to activate cryptic clusters of interest and validate the functions of biosynthetic genes. By following these guidelines, researchers can pave the way for discovering and characterizing valuable natural products.

Minireview
A review on computational models for predicting protein solubility
Teerapat Pimtawong, Jun Ren, Jingyu Lee, Hyang-Mi Lee, Dokyun Na
J. Microbiol. 2025;63(1):e.2408001.   Published online January 24, 2025
DOI: https://doi.org/10.71150/jm.2408001
  • 1,868 View
  • 152 Download
AbstractAbstract PDF

Protein solubility is a critical factor in the production of recombinant proteins, which are widely used in various industries, including pharmaceuticals, diagnostics, and biotechnology. Predicting protein solubility remains a challenging task due to the complexity of protein structures and the multitude of factors influencing solubility. Recent advances in computational methods, particularly those based on machine learning, have provided powerful tools for predicting protein solubility, thereby reducing the need for extensive experimental trials. This review provides an overview of current computational approaches to predict protein solubility. We discuss the datasets, features, and algorithms employed in these models. The review aims to bridge the gap between computational predictions and experimental validations, fostering the development of more accurate and reliable solubility prediction models that can significantly enhance recombinant protein production.

Review
Small regulatory RNAs as key modulators of antibiotic resistance in pathogenic bacteria
Yubin Yang, Hana Hyeon, Minju Joo, Kangseok Lee, Eunkyoung Shin
J. Microbiol. 2025;63(4):e2501027.   Published online April 2, 2025
DOI: https://doi.org/10.71150/jm.2501027
  • 1,027 View
  • 84 Download
AbstractAbstract PDF

The escalating antibiotic resistance crisis poses a significant challenge to global public health, threatening the efficacy of current treatments and driving the emergence of multidrug-resistant pathogens. Among the various factors associated with bacterial antibiotic resistance, small regulatory RNAs (sRNAs) have emerged as pivotal post-transcriptional regulators which orchestrate bacterial adaptation to antibiotic pressure via diverse mechanisms. This review consolidates the current knowledge on sRNA-mediated mechanisms, focusing on drug uptake, drug efflux systems, lipopolysaccharides, cell wall modification, biofilm formation, and mutagenesis. Recent advances in transcriptomics and functional analyses have revealed novel sRNAs and their regulatory networks, expanding our understanding of resistance mechanisms. These findings highlight the potential of targeting sRNA-mediated pathways as an innovative therapeutic strategy to combat antibiotic resistance, and offer promising avenues for managing challenging bacterial infections.

Full article
FunVIP: Fungal Validation and Identification Pipeline based on phylogenetic analysis
Chang Wan Seo, Shinnam Yoo, Yoonhee Cho, Ji Seon Kim, Martin Steinegger, Young Woon Lim
J. Microbiol. 2025;63(4):e2411017.   Published online April 29, 2025
DOI: https://doi.org/10.71150/jm.2411017
  • 981 View
  • 83 Download
AbstractAbstract PDFSupplementary Material

The increase of sequence data in public nucleotide databases has made DNA sequence-based identification an indispensable tool for fungal identification. However, the large proportion of mislabeled sequence data in public databases leads to frequent misidentifications. Inaccurate identification is causing severe problems, especially for industrial and clinical fungi, and edible mushrooms. Existing species identification pipelines require separate validation of a dataset obtained from public databases containing mislabeled taxonomic identifications. To address this issue, we developed FunVIP, a fully automated phylogeny-based fungal validation and identification pipeline (https://github.com/Changwanseo/FunVIP). FunVIP employs phylogeny-based identification with validation, where the result is achievable only with a query, database, and a single command. FunVIP command comprises nine steps within a workflow: input management, sequence-set organization, alignment, trimming, concatenation, model selection, tree inference, tree interpretation, and report generation. Users may acquire identification results, phylogenetic tree evidence, and reports of conflicts and issues detected in multiple checkpoints during the analysis. The conflicting sample validation performance of FunVIP was demonstrated by re-iterating the manual revision of a fungal genus with a database with mislabeled sequences, Fuscoporia. We also compared the identification performance of FunVIP with BLAST and q2-feature-classifier with two mass double-revised fungal datasets, Sanghuangporus and Aspergillus section Terrei. Therefore, with its automatic validation ability and high identification performance, FunVIP proves to be a highly promising tool for achieving easy and accurate fungal identification.

Review
Synthetic biology strategies for sustainable bioplastic production by yeasts
Huong-Giang Le, Yongjae Lee, Sun-Mi Lee
J. Microbiol. 2025;63(3):e2501022.   Published online March 28, 2025
DOI: https://doi.org/10.71150/jm.2501022
  • 1,070 View
  • 83 Download
  • 1 Crossref
AbstractAbstract PDF

The increasing environmental concerns regarding conventional plastics have led to a growing demand for sustainable alternatives, such as biodegradable plastics. Yeast cell factories, specifically Saccharomyces cerevisiae and Yarrowia lipolytica, have emerged as promising platforms for bioplastic production due to their scalability, robustness, and ease of manipulation. This review highlights synthetic biology approaches aimed at developing yeast cell factories to produce key biodegradable plastics, including polylactic acid (PLA), polyhydroxyalkanoates (PHAs), and poly (butylene adipate-co-terephthalate) (PBAT). We explore recent advancements in engineered yeast strains that utilize various synthetic biology strategies, such as the incorporation of new genetic elements at the gene, pathway, and cellular system levels. The combined efforts of metabolic engineering, protein engineering, and adaptive evolution have enhanced strain efficiency and maximized product yields. Additionally, this review addresses the importance of integrating computational tools and machine learning into the Design-Build-Test-Learn cycle for strain development. This integration aims to facilitate strain development while minimizing effort and maximizing performance. However, challenges remain in improving strain robustness and scaling up industrial production processes. By combining advanced synthetic biology techniques with computational approaches, yeast cell factories hold significant potential for the sustainable and scalable production of bioplastics, thus contributing to a greener bioeconomy.

Citations

Citations to this article as recorded by  
  • Advancing microbial engineering through synthetic biology
    Ki Jun Jeong
    Journal of Microbiology.2025; 63(3): e2503100.     CrossRef
Full articles
Whole-genome characterization and global phylogenetic comparison of cefotaxime-resistant Escherichia coli isolated from broiler chickens
Shahana Ahmed, Tridip Das, Chandan Nath, Tahia Ahmed, Keya Ghosh, Pangkaj Kumar Dhar, Ana Herrero-Fresno, Himel Barua, Paritosh Kumar Biswas, Md Zohorul Islam, John Elmerdahl Olsen
J. Microbiol. 2025;63(4):e2412009.   Published online April 29, 2025
DOI: https://doi.org/10.71150/jm.2412009
  • 807 View
  • 55 Download
AbstractAbstract PDFSupplementary Material

Antimicrobial resistance (AMR) poses a serious threat to public health, with the emergence of extended-spectrum beta-lactamases (ESBLs) in Enterobacteriaceae, particularly Escherichia coli, raising significant concerns. This study aims to elucidate the drivers of antimicrobial resistance, and the global spread of cefotaxime-resistant E. coli (CREC) strains. Whole-genome sequencing (WGS) was performed to explore genome-level characteristics, and phylogenetic analysis was conducted to compare twenty CREC strains from this study, which were isolated from broiler chicken farms in Bangladesh, with a global collection (n = 456) of CREC strains from multiple countries and hosts. The MIC analysis showed over 70% of strains isolated from broiler chickens exhibiting MIC values ≥ 256 mg/L for cefotaxime. Notably, 85% of the studied farms (17/20) tested positive for CREC by the end of the production cycle, with CREC counts increasing from 0.83 ± 1.75 log10 CFU/g feces on day 1 to 5.24 ± 0.72 log10 CFU/g feces by day 28. WGS revealed the presence of multiple resistance genes, including blaCTX-M, which was found in 30% of the strains. Phylogenetic comparison showed that the Bangladeshi strains were closely related to strains from diverse geographical regions and host species. This study provides a comprehensive understanding of the molecular epidemiology of CREC. The close phylogenetic relationships between Bangladeshi and global strains demonstrate the widespread presence of cefotaxime-resistant bacteria and emphasize the importance of monitoring AMR in food-producing animals to mitigate the spread of resistant strains.

Fungal diversity from Fildes Peninsula (Antarctica) and their antibiosis bioactivity against two plant pathogens
Ji Seon Kim, Enzo Romero, Yoonhee Cho, Ramón Ahumada-Rudolph, Christian Núñez, Jonhatan Gómez-Espinoza, Ernesto Moya-Elizondo, Sigisfredo Garnica, Young Woon Lim, Jaime R. Cabrera-Pardo
J. Microbiol. 2025;63(5):e2411029.   Published online April 14, 2025
DOI: https://doi.org/10.71150/jm.2411029
  • 786 View
  • 83 Download
AbstractAbstract PDFSupplementary Material

Antarctic fungi can effectively adapt to extreme environments, which leads to the production of unique bioactive compounds. Studies on the discovery of fungi in the diverse environments of Antarctica and their potential applications are increasing, yet remain limited. In this study, fungi were isolated from various substrates on the Fildes Peninsula in Antarctica and screened for their antibiosis activity against two significant plant pathogenic fungi, Botrytis cinerea and Fusarium culmorum. Phylogenetic analysis using multiple genetic markers revealed that the isolated Antarctic fungal strains are diverse, some of which are novel, emphasizing the underexplored biodiversity of Antarctic fungi. These findings suggest that these fungi have potential for the development of new antifungal agents that can be applied in agriculture to manage fungal plant pathogens. Furthermore, the antibiosis activities of the isolated Antarctic fungi were evaluated using a dual-culture assay. The results indicated that several strains from the genera Cyathicula, Penicillium, and Pseudeurotium significantly inhibited pathogen growth, with Penicillium pancosmium showing the highest inhibitory activity against Botrytis cinerea. Similarly, Aspergillus and Tolypocladium strains exhibited strong antagonistic effects against Fusarium culmorum. This study enhances our understanding of Antarctic fungal diversity and highlights its potential for biotechnological applications.

Reviews
Untranslated region engineering strategies for gene overexpression, fine-tuning, and dynamic regulation
Jun Ren, So Hee Oh, Dokyun Na
J. Microbiol. 2025;63(3):e2501033.   Published online March 28, 2025
DOI: https://doi.org/10.71150/jm.2501033
  • 940 View
  • 55 Download
  • 1 Crossref
AbstractAbstract PDF

Precise and tunable gene expression is crucial for various biotechnological applications, including protein overexpression, fine-tuned metabolic pathway engineering, and dynamic gene regulation. Untranslated regions (UTRs) of mRNAs have emerged as key regulatory elements that modulate transcription and translation. In this review, we explore recent advances in UTR engineering strategies for bacterial gene expression optimization. We discuss approaches for enhancing protein expression through AU-rich elements, RG4 structures, and synthetic dual UTRs, as well as ProQC systems that improve translation fidelity. Additionally, we examine strategies for fine-tuning gene expression using UTR libraries and synthetic terminators that balance metabolic flux. Finally, we highlight riboswitches and toehold switches, which enable dynamic gene regulation in response to environmental or metabolic cues. The integration of these UTR-based regulatory tools provides a versatile and modular framework for optimizing bacterial gene expression, enhancing metabolic engineering, and advancing synthetic biology applications.

Citations

Citations to this article as recorded by  
  • Advancing microbial engineering through synthetic biology
    Ki Jun Jeong
    Journal of Microbiology.2025; 63(3): e2503100.     CrossRef
Recent advances in targeted mutagenesis to expedite the evolution of biological systems
Seungjin Kim, Seungwon Lee, Hyun Gyu Lim
J. Microbiol. 2025;63(3):e2501008.   Published online March 28, 2025
DOI: https://doi.org/10.71150/jm.2501008
  • 734 View
  • 79 Download
  • 1 Crossref
AbstractAbstract PDF

Evolution has been systematically exploited to engineer biological systems to obtain improved or novel functionalities by selecting beneficial mutations. Recent innovations in continuous targeted mutagenesis within living cells have emerged to generate large sequence diversities without requiring multiple steps. This review comprehensively introduces recent advancements in this field, categorizing them into three approaches depending on methods to create mutations: orthogonal error-prone DNA polymerases, site-specific base editors, and homologous recombination of mutagenic DNA fragments. Combined with high-throughput screening methods, these advances expedited evolution processes with significant reduction of labor and time. These approaches promise broader industrial and research applications, including enzyme improvement, metabolic engineering, and drug resistance studies.

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  • Advancing microbial engineering through synthetic biology
    Ki Jun Jeong
    Journal of Microbiology.2025; 63(3): e2503100.     CrossRef
Research Article
Efficiency of reverse genetics methods for rescuing severe acute respiratory syndrome coronavirus 2
Chang-Joo Park, Taehun Kim, Seung-Min Yoo, Myung-Shin Lee, Nam-Hyuk Cho, Changhoon Park
J. Microbiol. 2025;63(2):e2411023.   Published online February 27, 2025
DOI: https://doi.org/10.71150/jm.2411023
  • 921 View
  • 47 Download
AbstractAbstract PDF

Bacteria-free reverse genetics techniques are crucial for the efficient generation of recombinant viruses, bypassing the need for labor-intensive bacterial cloning. These methods are particularly relevant for studying the pathogenesis of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the causative agent of COVID-19. This study compared the efficiency of three bacteria-free approaches—circular polymerase extension reaction (CPER) with and without nick sealing and infectious sub-genomic amplicons (ISA)—to bacterial artificial chromosome (BAC)-based technology for rescuing SARS-CoV-2. Significant differences in viral titers following transfection were observed between methods. CPER with nick sealing generated virus titers comparable to those of the BAC-based method and 10 times higher than those of the standard CPER. In contrast, ISA demonstrated extremely low efficiency, as cytopathic effects were detected only after two passages. All rescued viruses exhibited replication kinetics consistent with those of the original strain, with no significant deviation in replication capacity. Furthermore, the utility of CPER and ISA in genetically modifying SARS-CoV-2 was demonstrated by successfully inserting the gene encoding green fluorescent protein into the genome. Overall, this study underscores the potential of bacteria-free methods, such as CPER and ISA, in advancing SARS-CoV-2 research while highlighting their significant differences in efficiency.

Full articles
Arctic lichen Cladonia borealis-induced cell death is mediated by p53-independent activation of Caspase-9 and PARP-1 signaling in human colorectal cancer cell lines
Ju-Mi Hong, Seul Ki Min, Kyung Hee Kim, Se Jong Han, Joung Han Yim, Sojin Kim, Youn-Jung Kim, Il-Chan Kim
J. Microbiol. 2025;63(4):e2412012.   Published online April 29, 2025
DOI: https://doi.org/10.71150/jm.2412012
  • 558 View
  • 24 Download
AbstractAbstract PDF

The anti-cancer effects of Cladonia borealis (an Arctic lichen) methanol extract (CBME) on human colon carcinoma HCT116 cells were investigated for the first time. The proliferation of the HCT116 cells treated with CBME significantly decreased in a dose- and time-dependent manner. Flow cytometry results indicated that treatment with CBME resulted in significant apoptosis in the HCT116 cells. Furthermore, immunoblotting and qRT-PCR results revealed the expression of apoptosis-related marker genes and indicated a significant downregulation of the apoptosis regulator B-cell lymphoma expression and upregulation of the cleaved form of poly (ADP-ribose) polymerase as DNA repair and apoptosis regulators and central tumor suppressor p53. Therefore, CBME significantly inhibited cell proliferation by inducing apoptosis via the mitochondrial apoptotic pathway in colon carcinoma cells. Collectively, these data suggested that CBME contained one or more compounds with anti-cancer effects and could be a potential therapeutic agent. Further studies are required to identify candidate compounds and understand the mechanism of action of CBME.

Genetic insights into novel lysis suppression by phage CSP1 in Escherichia coli
Moosung Kim, Sangryeol Ryu
J. Microbiol. 2025;63(4):e2501013.   Published online April 29, 2025
DOI: https://doi.org/10.71150/jm.2501013
  • 527 View
  • 21 Download
  • 1 Web of Science
  • 1 Crossref
AbstractAbstract PDFSupplementary Material

Lysis inhibition (LIN) in bacteriophage is a strategy to maximize progeny production. A clear plaque-forming mutant, CSP1C, was isolated from the turbid plaque-forming CSP1 phage. CSP1C exhibited an adsorption rate and replication dynamics similar to CSP1. Approximately 90% of the phages were adsorbed to the host cell within 12 min, and both phages had a latent period of 25 min. Burst sizes were 171.42 ± 31.75 plaque-forming units (PFU) per infected cell for CSP1 and 168.94 ± 51.67 PFU per infected cell for CSP1C. Both phages caused comparable reductions in viable E. coli cell counts at a low multiplicity of infection (MOI). However, CSP1 infection did not reduce turbidity, suggesting a form of LIN distinct from the well-characterized LIN of T4 phage. Genomic analysis revealed that a 4,672-base pairs (bp) DNA region, encompassing part of the tail fiber gene, CSP1_020, along with three hypothetical genes, CSP1_021, CSP1_022, and part of CSP1_023, was deleted from CSP1 to make CSP1C. Complementation analysis in CSP1C identified CSP1_020, CSP1_021, and CSP1_022 as a minimal gene set required for the lysis suppression in CSP1. Co-expression of these genes in E. coli with holin (CSP1_092) and endolysin (CSP1_091) resulted in lysis suppression. Lysis suppression was abolished by disrupting the proton motive force (PMF), supporting their potential role as antiholin. Additionally, CSP1_021 directly interacts with holin, suggesting that it may function as an antiholin. These findings identify new genetic factors involved in lysis suppression in CSP1, providing broader insights into phage strategies for modulating host cell lysis.

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  • Characterization and genome analyses of the novel phages targeting extraintestinal Escherichia coli clones ST131 and ST410
    Md Shamsuzzaman, Yoon-Jung Choi, Shukho Kim, Jungmin Kim
    International Microbiology.2025;[Epub]     CrossRef
Genomic profiling of soil nitrifying microorganisms enriched on floating membrane filter
Christiana Abiola, Joo-Han Gwak, Ui-Ju Lee, Aderonke Odunayo Adigun, Sung-Keun Rhee
J. Microbiol. 2025;63(4):e2502002.   Published online April 29, 2025
DOI: https://doi.org/10.71150/jm.2502002
  • 524 View
  • 27 Download
AbstractAbstract PDFSupplementary Material

Recently, floating membrane filter cultivation was adopted to simulate solid surface and enrich surface-adapted soil ammonia-oxidizing archaea (AOA) communities from agricultural soil, as opposed to the conventional liquid medium. Here, we conducted metagenomic sequencing to recover nitrifier bins from the floating membrane filter cultures and reveal their genomic properties. Phylogenomic analysis showed that AOA bins recovered from this study, designated FF_bin01 and FF_bin02, are affiliated with the Nitrososphaeraceae family, while the third bin, FF_bin03, is a nitrite-oxidizing bacterium affiliated with the Nitrospiraceae family. Based on the ANI/AAI analysis, FF_bin01 and FF_bin02 are identified as novel species within the genera “Candidatus Nitrosocosmicus” and Nitrososphaera, respectively, while FF_bin03 represents a novel species within the genus Nitrospira. The pan and core genome analysis for the 29 AOA genomes considered in this study revealed 5,784 orthologous clusters, out of which 653 were core orthologous clusters. Additionally, 90 unique orthologous clusters were conserved among the Nitrososphaeraceae family, suggesting their potential role in enhancing culturability and adaptation to diverse environmental conditions. Intriguingly, FF_bin01 and FF_bin02 harbor a gene encoding manganese catalase and FF_bin03 also possesses a heme catalase gene, which might enhance their growth on the floating membrane filter. Overall, the floating membrane filter cultivation has proven to be a promising approach for isolating distinct soil AOA, and further modifications to this technique could stimulate the growth of a broader range of uncultivated nitrifiers from diverse soil environments.


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