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Life sciences · Journal article
Journal of Genetic Engineering and Biotechnology · August 5, 2026
Early or partial results. Treat as a signal, not a conclusion.
This study describes the isolation of a novel endophytic Streptomyces sp. (YBRX0) from a Vietnamese medicinal plant and demonstrates that its crude fermentation extract exhibits in vitro antibacterial activity against multiple pathogens and antioxidant capacity. The work is exploratory bioprospecting; the crude extract is uncharacterized, no purified bioactive compound has been identified, and no clinical or in vivo evidence is presented.
Microbial isolate characterization and in vitro bioactivity screening. Endophytic Streptomyces sp. YBRX0 isolated from root tissues of the Vietnamese medicinal plant Croton tonkinensis Gagnep.. Intervention: Ethyl acetate fermentation extract of Streptomyces sp. YBRX0. Vietnam (source plant); location of isolation and testing not explicitly stated..
At 1 mg/mL, crude ethyl acetate extract showed broad-spectrum activity against Gram-positive and Gram-negative pathogens with MIC values ranging from 8 to 16 μg/mL Antioxidant screening yielded an IC₅₀ of 197.26 ± 8.87 μg/mL GC–MS tentatively identified Pyrrolopyrazine diketopiperazines and Benzeneacetamide as principal constituents of the crude extract
No mechanism of action, cytotoxicity, or in vivo efficacy assessed
This discovery does not yet inform clinical practice. The crude extract shows promise as a source for compound isolation, but no purified bioactive agent has been identified, and no evidence of safety, efficacy, or mechanism exists in cellular or animal models.
In vitro characterization of a novel endophytic Streptomyces isolate with crude extract bioactivity; no clinical endpoint, no purified compound, and no comparator tested against.
As stated by the source record.
Quoted from the source exactly as published.
This discovery does not yet inform clinical practice. The crude extract shows promise as a source for compound isolation, but no purified bioactive agent has been identified, and no evidence of safety, efficacy, or mechanism exists in cellular or animal models.
Graded across the dimensions that decide whether you should act, each from what the source actually supports. There is no single score, and where a dimension was not assessed it says so.
The rise of antimicrobial resistance and emerging infectious diseases necessitates the discovery of novel antibacterial agents. Endophytic actinomycetes, especially Streptomyces species colonizing medicinal plant tissues, constitute a reservoir of structurally diverse bioactive metabolites that remains insufficiently characterized. This study reports the isolation and comprehensive characterization of an endophytic actinomycete, designated strain YBRX0, recovered from the root tissues of the Vietnamese medicinal plant Croton tonkinensis Gagnep. Strain identity was established through an integrated approach combining colony morphology, scanning electron microscopy, physiological and biochemical profiling, and 16S rRNA gene phylogenetic analysis. Bioactivity screening of the ethyl acetate fermentation extract employed agar well diffusion to assess antibacterial spectrum, with inhibitory potency quantified by broth microdilution. Antioxidant capacity was measured via DPPH radical scavenging, and secondary metabolite composition was profiled by GC–MS. The integrated characterization placed strain YBRX0 unambiguously within the genus. At 1 mg/mL, the ethyl acetate extract demonstrated broad-spectrum activity against both Gram-positive and Gram-negative pathogens, with MIC values ranging from 8 to 16 μg/mL. Antioxidant screening yielded an IC₅₀ of 197.26 ± 8.87 μg/mL. GC–MS tentatively identified Pyrrolopyrazine diketopiperazines and Benzeneacetamide as principal constituents. Collectively, these findings indicate that the crude extract of Streptomyces sp. YBRX0 exhibited notable antibacterial activity despite being an unfractionated mixture, supporting its potential as a promising source of bioactive metabolites for further bioprospecting and compound isolation efforts targeting drug-resistant pathogens.
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