ArticleBrazilian journal of microbiology : [publication of the Brazilian Society for Microbiology]2026
Biogenic synthesis and transcriptomic insights into selenium nanoparticle formation by Lactiplantibacillus plantarum SMB14 isolated from goat manure.
Article in Brazilian journal of microbiology : [publication of the Brazilian Society for Microbiology], 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
purposeBiogenic selenium nanoparticles (SeNPs) offer an eco-friendly alternative to chemical synthesis for producing bioavailable and stable selenium. This study aimed to isolate an efficient Se(IV)-reducing bacterium from livestock manure and to elucidate the molecular mechanisms underlying SeNP biosynthesis, providing insight into its potential agricultural applications.
methodsA selenium-transforming strain was isolated from goat manure and identified as Lactiplantibacillus plantarum SMB14 based on 16 S rRNA sequencing. The strain was cultured in MRS broth supplemented with sodium selenite (Na2SeO3: 100 mg L⁻¹) to produce SeNPs, which were characterized. Transcriptomic sequencing was conducted to compare gene expression profiles between control and Se(IV)-treated cells, and functional enrichment analyses were performed to identify metabolic pathways involved in Se(IV) reduction.
resultsSMB14 exhibited high Se(IV)-reducing efficiency (> 80%) and produced extracellular SeNPs stabilized by biomolecular coatings. Transcriptome analysis revealed 978 differentially expressed genes, with significant upregulation of redox-active oxidoreductases (qorB, SDR family), thiol-related enzymes (TrxA, GorA), and membrane transporters (pstS, glpF2, nhaC). Functional pathways related to oxidative phosphorylation, amino acid metabolism, and cellular redox balance were significantly enriched, supporting a coordinated enzymatic–nonenzymatic reduction mechanism.
conclusionThis study demonstrates that L. plantarum SMB14 employs a multi-pathway redox network to convert toxic Se(IV) into stable SeNPs through synergistic enzymatic and thiol-mediated reductions. These findings highlight the potential of SMB14 as a green biocatalyst for nanoselenium production and as a probiotic platform for sustainable selenium supplementation in agriculture and environmental biotechnology.
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