Antibiotic production reduces the cost of resource exploitation in Streptomyces coelicolor.

Antibiotic production by Streptomyces coelicolor significantly increases fitness against resource exploiters, especially under low resource concentrations.

• Why it matters: Understanding how bacteria privatize public goods in competitive environments can reveal strategies that influence microbial resource use and survival, addressing gaps in knowledge about bacterial cooperation and competition.
• What they did: Experiments with S. coelicolor and Bacillus subtilis showed that resource exploitation reduces S. coelicolor fitness on complex polysaccharides like starch, and that antibiotics markedly improve S. coelicolor fitness despite their metabolic costs, particularly at lower resource levels.
• The result: These findings suggest that antibiotic secretion provides context-dependent benefits in bacterial competition, especially under resource-limited conditions, highlighting the role of resource complexity and concentration in bacterial competitive strategies.