Journal of Microbiology

Journal Articles

Effects of Phosphorus‑dissolving Dark Septate Endophytes on the Growth of Blueberry: Qixin Luo , Rui Hou , Xiaojing Shang , Si Li; J. Microbiol. 2023;61(9):837-851. Published online October 5, 2023; DOI: https://doi.org/10.1007/s12275-023-00080-2

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Dark septate endophytes (DSEs) are widely distributed and improve plant growth. DSEs secrete large amounts of enzymes to mineralize insoluble phosphorus in soil and convert it into soluble phosphorus, promoting plant uptake of phosphorus. However, the effects of DSEs with phosphate-solubilizing ability on host plants need further study. In this study, phosphorusdissolving DSEs were screened for growth-promoting effects. We isolated, identified and characterized three DSE species (Thozetella neonivea, Pezicula ericae and Hyaloscyphaceae sp.) showing phosphate-solubilizing ability. The impact of single, dual or triple inoculation of DSEs on blueberry plant characteristics was studied. Their effects on colonization intensity, seedling biomass, nutrients in plants and soil, and activities of plant resistance enzymes and soil enzymes were markedly upregulated relative to the control (P < 0.05). The available phosphorus and acid phosphatase levels in different combinations were significantly increased. These findings indicate that the application of the three DSEs may be valuable in facilitating the cultivation of blueberry with a higher biomass and improved plant quality.

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Diversity and Functional Roles of Root-Associated Endophytic Fungi in Two Dominant Pioneer Trees Reclaimed from a Metal Mine Slag Heap in Southwest China
Bo Bi, Yuqing Xiao, Xiaonan Xu, Qianqian Chen, Haiyan Li, Zhiwei Zhao, Tao Li
Microorganisms.2024; 12(10): 2067. CrossRef
Short-term organic fertilizer substitution increases sorghum yield by improving soil physicochemical characteristics and regulating microbial community structure
Mengen Nie, Guangqian Yue, Lei Wang, Yizhong Zhang
Frontiers in Plant Science.2024;[Epub] CrossRef

Functional characterization of HigBA toxin-antitoxin system in an Arctic bacterium, Bosea sp. PAMC 26642: Eunsil Choi , Ahhyun Huh , Changmin Oh , Jeong-Il Oh , Ho Young Kang , Jihwan Hwang; J. Microbiol. 2022;60(2):192-206. Published online February 1, 2022; DOI: https://doi.org/10.1007/s12275-022-1619-9

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Abstract

Toxin-antitoxin (TA) systems are growth-controlling genetic elements consisting of an intracellular toxin protein and its cognate antitoxin. TA systems have been spread among microbial genomes through horizontal gene transfer and are now prevalent in most bacterial and archaeal genomes. Under normal growth conditions, antitoxins tightly counteract the activity of the toxins. Upon stresses, antitoxins are inactivated, releasing activated toxins, which induce growth arrest or cell death. In this study, among nine functional TA modules in Bosea sp. PAMC 26642 living in Arctic lichen, we investigated the functionality of BoHigBA2. BohigBA2 is located close to a genomic island and adjacent to flagellar gene clusters. The expression of BohigB2 induced the inhibition of E. coli growth at 37°C, which was more manifest at 18°C, and this growth defect was reversed when BohigA2 was co-expressed, suggesting that this BoHigBA2 module might be an active TA module in Bosea sp. PAMC 26642. Live/dead staining and viable count analyses revealed that the BoHigB2 toxin had a bactericidal effect, causing cell death. Furthermore, we demonstrated that BoHigB2 possessed mRNA-specific ribonuclease activity on various mRNAs and cleaved only mRNAs being translated, which might impede overall translation and consequently lead to cell death. Our study provides the insight to understand the cold adaptation of Bosea sp. PAMC 26642 living in the Arctic.

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Evaluating the Contribution of the Predicted Toxin–Antitoxin System HigBA to Persistence, Biofilm Formation, and Virulence in Burkholderia pseudomallei
Itziar Chapartegui-González, Nittaya Khakhum, Jacob L. Stockton, Alfredo G. Torres, Igor E. Brodsky
Infection and Immunity.2022;[Epub] CrossRef
Chronicle of Research into Lichen-Associated Bacteria
Zichen He, Takeshi Naganuma
Microorganisms.2022; 10(11): 2111. CrossRef
Degradation of amoxicillin by newly isolated Bosea sp. Ads-6
Lei Yan, Ning Yan, Xi-Yan Gao, Ying Liu, Zhi-Pei Liu
Science of The Total Environment.2022; 828: 154411. CrossRef

Lactiplantibacillus plantarum LRCC5314 includes a gene for serotonin biosynthesis via the tryptophan metabolic pathway: Jiseon Jeong , Yunjeong Lee , Seokmin Yoon , Jong-Hwa Kim , Wonyong Kim; J. Microbiol. 2021;59(12):1092-1103. Published online December 4, 2021; DOI: https://doi.org/10.1007/s12275-021-1472-2

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Abstract

As the functions of probiotics within the same species may not be shared, it is important to analyze the genetic characteristics of strains to determine their safety and usefulness before industrial applications. Hence the present study was undertaken to determine functional genes, and beneficial activities of strain LRCC5314, a bacterial strain isolated from kimchi through comparative genomic analysis. Phylogenetic analysis based on the 16S rRNA gene sequence showed that strain LRCC5314 was a member of the species L. plantarum. Whole genome size of strain LRCC5314 was sequence was 3.25 Mb long, with a G + C content of 44.5 mol% and 3,031 predicted genes. Strain LRCC5314 could metabolize hexoses through homofermentation, which produces only lactic acid from hexoses. According to gene annotation, strain LRCC- 5314 contained genes of EPS production and CRISPR. Moreover, the strain contained genes that could encode a complete biosynthetic pathway for the production of tryptophan, which can be used as a precursor of serotonin. Notably, the tryptophan and serotonin activities strain LRCC5314 were higher than those of reference strains, L. plantarum ATCC 14917T, DSM 20246, DSM 2601, and ATCC 8014, which reach tryptophan amount of 0.784 ± 0.045 μM/ml in MRS broth and serotonin concentration of 19.075 ± 0.295 ng/ml in HT-22 cells. These findings indicated that L. plantarum LRCC5314 could provide a source for serotonin production and could be used as a functional probiotic for stress regulation.

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Ramya Balasubramanian, Elizabeth Schneider, Eoin Gunnigle, Paul D. Cotter, John F. Cryan
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Effect of postbiotic Lactiplantibacillus plantarum LRCC5314 supplemented in powdered milk on type 2 diabetes in mice
J.-H. Kim, W. Kwak, Y. Nam, J. Baek, Y. Lee, S. Yoon, W. Kim
Journal of Dairy Science.2024; 107(8): 5301. CrossRef
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Erik C. Swanson, Christopher M. Basting, Nichole R. Klatt
Microbiome.2024;[Epub] CrossRef
Whole-Genome Sequence of Lactococcus lactis Subsp. lactis LL16 Confirms Safety, Probiotic Potential, and Reveals Functional Traits
Justina Mileriene, Jurgita Aksomaitiene, Kristina Kondrotiene, Tora Asledottir, Gerd Elisabeth Vegarud, Loreta Serniene, Mindaugas Malakauskas
Microorganisms.2023; 11(4): 1034. CrossRef
Probiotic Incorporation into Yogurt and Various Novel Yogurt-Based Products
Douglas W. Olson, Kayanush J. Aryana
Applied Sciences.2022; 12(24): 12607. CrossRef

Review

Potential of Bacillus velezensis as a probiotic in animal feed: a review: Fatima Khalid , Anam Khalid , Yuechi Fu , Qian Hu , Yunfang Zheng , Salman Khan , Zaigui Wang; J. Microbiol. 2021;59(7):627-633. Published online July 1, 2021; DOI: https://doi.org/10.1007/s12275-021-1161-1

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Abstract

Bacillus velezensis is a plant growth-promoting bacterium that can also inhibit plant pathogens. However, based on its properties, it is emerging as a probiotic in animal feed. This review focuses on the potential characteristics of B. velezensis for use as a probiotic in the animal feed industry. The review was conducted by collecting recently published articles from peer-reviewed journals. Google Scholar and PubMed were used as search engines to access published literature. Based on the information obtained, the data were divided into three groups to discuss the (i) probiotic characteristics of B. velezensis, (ii) probiotic potential for fish, and (iii) the future potential of this species to be developed as a probiotic for the animal feed industry. Different strains of B. velezensis isolated from different sources were found to have the ability to produce antimicrobial compounds and have a beneficial effect on the gut microbiota, with the potential to be a candidate probiotic in the animal feed industry. This review provides valuable information about the characteristics of B. velezensis, which can provide researchers with a better understanding of the use of this species in the animal feed industry.

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Doaa S. Zaid, Shuyun Cai, Chang Hu, Ziqi Li, Youguo Li, Jeffrey A. Gralnick
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Research Support, N.I.H., Extramural

The Mycobacterium tuberculosis relBE toxin:antitoxin genes are stress-responsive modules that regulate growth through translation inhibition: Shaleen B. Korch , Vandana Malhotra , Heidi Contreras , Josephine E. Clark-Curtiss; J. Microbiol. 2015;53(11):783-795. Published online October 28, 2015; DOI: https://doi.org/10.1007/s12275-015-5333-8

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Abstract

Toxin-antitoxin (TA) genes are ubiquitous among bacteria and are associated with persistence and dormancy. Following exposure to unfavorable environmental stimuli, several species (Escherichia coli, Staphylococcus aureus, Myxococcus xanthus) employ toxin proteins such as RelE and MazF to downregulate growth or initiate cell death. Mycobacterium tuberculosis possesses three Rel TA modules (RelMtb): RelBEMtb, RelFGMtb and RelJKMtb (Rv1246c-Rv1247c, Rv2865-Rv2866, and Rv3357-Rv3358, respectively), which inhibit mycobacterial growth when the toxin gene (relE, relG, relK) is expressed independently of the antitoxin gene (relB, relF, relJ). In the present study, we examined the in vivo mechanism of the RelEMtb toxin protein, the impact of RelEMtb on M. tuberculosis physiology and the environmental conditions that regulate all three relMtb modules. RelEMtb negatively impacts growth and the structural integrity of the mycobacterial envelope, generating cells with aberrant forms that are prone to extensive aggregation. At a time coincident with growth defects, RelEMtb mediates mRNA degradation in vivo resulting in significant changes to the proteome. We establish that relMtb modules are stress responsive, as all three operons are transcriptionally activated following mycobacterial exposure to oxidative stress or nitrogen-limiting growth environments. Here we present evidence that the relMtb toxin:antitoxin family is stress-responsive and, through the degradation of mRNA, the RelEMtb toxin influences the growth, proteome and morphology of mycobacterial cells.

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Retraction of Publication

Retraction Note to: Identification of the Vibrio vulnificus htpG Gene and Its Influence on Cold Shock Recovery: Slae Choi , Kyungku Jang , Seulah Choi , Hee-jee Yun , Dong-Hyun Kang; J. Microbiol. 2022;60(6):657-657.; DOI: https://doi.org/10.1007/s12275-022-1680-4

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