Tiny Heroes Beneath Our Feet: Antibiotic-Producing Soil Bacteria

The rapid rise in antibiotic resistance represents one of the most urgent public health crises of the twenty-first century. Multidrug-resistant pathogens, particularly those within the ESKAPE group, are undermining decades of medical advancement by limiting the effectiveness of standard treatments. At the same time, many major pharmaceutical companies have drastically reduced or eliminated their antibiotic discovery programs due to low financial returns and the short duration of antibiotic treatment courses. Although global health organizations emphasize surveillance and responsible antibiotic use, a critical gap remains in early-stage discovery efforts focused on identifying novel antibiotic-producing organisms from underexplored environments.

This project addresses that gap through soil-based environmental microbial screening as part of the Tiny Earth antibiotic discovery program. Using a soil sample we collected, we isolated and identified a bacterium as Brevibacillus laterosporus through 16S rRNA gene sequencing. This isolate previously demonstrated significant inhibitory activity against safe relatives of two ESKAPE pathogens in earlier screening assays. Building on these findings, we plan to expand safe-relative testing to include all six ESKAPE pathogens to evaluate the extent of its antimicrobial activity. Additionally, another potential antibiotic-producing isolate is being characterized using Gram staining, PCR amplification and 16S rRNA gene sequencing, and biochemical testing.

Overall, this project demonstrates the potential of undergraduate research initiatives to help rebuild the antibiotic discovery pipeline through expanded environmental exploration and early-stage antimicrobial development.