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Updated: Jun 16, 2025
Author Spotlight: Advancing Antibiotic Resistance Research Using an Efflux-Deficient Bacterial Strain and a Single-Copy Gene Expression System
Published on: January 5, 2024
Interaction of Acinetobacter sp. RIT 592 induces the production of broad-spectrum antibiotics in Exiguobacterium sp.
Anutthaman Parthasarathy1, Renata Rezende Miranda2, T J Bedore3
1School of Chemistry and Biosciences, University of Bradford, Bradford, United Kingdom.
Abstract:
Antimicrobial resistance (AMR) is one of the most alarming global public health challenges of the 21st century. Over 3 million antimicrobial-resistant infections occur in the United States annually, with nearly 50,000 cases being fatal. Innovations in drug discovery methods and platforms are crucial to identify novel antibiotics to combat AMR. We present the isolation and characterization of potentially novel antibiotic lead compounds produced by the cross-feeding of two rhizosphere bacteria, Acinetobacter sp. RIT 592 and Exiguobacterium sp. RIT 594. We used solid-phase extraction (SPE) followed by liquid chromatography (LC) to enrich antibiotic extracts and subsequently mass spectrometry (MS) analysis of collected fractions for compound structure identification and characterization. The MS data were processed through the Global Natural Product Social Molecular Networking (GNPS) database. The supernatant from RIT 592 induced RIT 594 to produce a cocktail of antimicrobial compounds active against Gram-positive and negative bacteria. The GNPS analysis indicated compounds with known antimicrobial activity in the bioactive samples, including oligopeptides and their derivatives. This work emphasizes the utility of microbial community-based platforms to discover novel clinically relevant secondary metabolites. Future work includes further structural characterization and antibiotic activity evaluation of the individual compounds against pathogenic multidrug-resistant (MDR) bacteria.
Insights
Researchers discovered new antibiotic compounds from soil bacteria interactions. This microbial community approach offers a promising strategy to combat antimicrobial resistance (AMR) and find novel drug leads.
Area of Science:
- Microbiology
- Drug Discovery
- Natural Products Chemistry
Background:
- Antimicrobial resistance (AMR) poses a significant global health threat, necessitating the discovery of novel antibiotics.
- Over 3 million resistant infections and 50,000 deaths occur annually in the US due to AMR.
Purpose of the Study:
- To isolate and characterize novel antibiotic lead compounds from interacting rhizosphere bacteria.
- To explore microbial community-based platforms for identifying new antimicrobial agents.
Main Methods:
- Cross-feeding experiments involving *Acinetobacter* sp. RIT 592 and *Exiguobacterium* sp. RIT 594.
- Solid-phase extraction (SPE) and liquid chromatography (LC) for extract enrichment.
- Mass spectrometry (MS) and Global Natural Product Social Molecular Networking (GNPS) for compound identification.
Main Results:
- Supernatant from *Acinetobacter* sp. RIT 592 induced *Exiguobacterium* sp. RIT 594 to produce antimicrobial compounds.
- Bioactive samples contained oligopeptides and derivatives with activity against Gram-positive and Gram-negative bacteria.
- GNPS analysis confirmed known antimicrobial compounds within the identified fractions.
Conclusions:
- Microbial community-based platforms are effective for discovering clinically relevant secondary metabolites.
- This study highlights a novel source of potential antibiotic lead compounds.
- Further investigation is needed for structural characterization and efficacy testing against multidrug-resistant pathogens.
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