Digging for Drugs: Discovering Antibiotic-Producing Bacteria in Soil
Location
CoLab, COM 324
Start Date
30-4-2026 2:30 PM
Document Type
Poster
Description
Antibiotic resistance is a growing global health concern, necessitating the discovery of novel antimicrobial compounds. This study aimed to isolate and characterize soil-dwelling bacteria with potential antibiotic-producing capabilities. A soil sample was serially diluted and cultured on agar plates to obtain isolated microbial colonies. Distinct colonies were selected based on observable inhibition of surrounding microbial growth and transferred to master plates for further screening. Promising candidates were subcultured using streak plating techniques to obtain pure isolates. These isolates were analyzed using Gram staining to assess cellular morphology and classification. Observations of growth inhibition patterns suggested that certain isolates may produce antimicrobial compounds capable of suppressing neighboring bacteria. To further investigate the identity of these candidates, polymerase chain reaction (PCR) was used to amplify the DNA region encoding the 16S ribosomal RNA gene, a highly conserved sequence commonly used for bacterial identification. The amplified DNA products were then analyzed using gel electrophoresis to confirm successful amplification and assess fragment size. This molecular approach enables comparison of genetic sequences to identify bacterial species and provides insight into the taxonomy of the isolates. The results of this study highlight the presence of diverse microbial populations within soil ecosystems and support the continued exploration of environmental bacteria as a source of novel antibiotics. By combining classical microbiological techniques with molecular analysis, this project demonstrates an effective workflow for identifying and characterizing bacteria with potential clinical relevance.
Digging for Drugs: Discovering Antibiotic-Producing Bacteria in Soil
CoLab, COM 324
Antibiotic resistance is a growing global health concern, necessitating the discovery of novel antimicrobial compounds. This study aimed to isolate and characterize soil-dwelling bacteria with potential antibiotic-producing capabilities. A soil sample was serially diluted and cultured on agar plates to obtain isolated microbial colonies. Distinct colonies were selected based on observable inhibition of surrounding microbial growth and transferred to master plates for further screening. Promising candidates were subcultured using streak plating techniques to obtain pure isolates. These isolates were analyzed using Gram staining to assess cellular morphology and classification. Observations of growth inhibition patterns suggested that certain isolates may produce antimicrobial compounds capable of suppressing neighboring bacteria. To further investigate the identity of these candidates, polymerase chain reaction (PCR) was used to amplify the DNA region encoding the 16S ribosomal RNA gene, a highly conserved sequence commonly used for bacterial identification. The amplified DNA products were then analyzed using gel electrophoresis to confirm successful amplification and assess fragment size. This molecular approach enables comparison of genetic sequences to identify bacterial species and provides insight into the taxonomy of the isolates. The results of this study highlight the presence of diverse microbial populations within soil ecosystems and support the continued exploration of environmental bacteria as a source of novel antibiotics. By combining classical microbiological techniques with molecular analysis, this project demonstrates an effective workflow for identifying and characterizing bacteria with potential clinical relevance.
Comments
The faculty mentor for this project was Matt Ducote.