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Community-specific cell death sustains bacterial expansion under phosphorus starvation.
Ziyan Wang1, Lingbin Zeng1, Shouxian Hu1
1Center for Infection Biology, School of Basic Medical Sciences, Tsinghua University, Beijing, China.
Nature Chemical Biology
|January 3, 2025
Summary
Escherichia coli biofilms sustain colony expansion under phosphorus limitation via nutrient recycling. This process involves reactive oxygen species-mediated cell death, spatially separated from growth, enabling phosphorus reuse.
Area of Science:
- Microbiology
- Bacterial Physiology
- Environmental Microbiology
Background:
- Colony expansion is crucial for bacterial survival and territory establishment.
- The ability of bacteria to maintain colony expansion under nutrient scarcity, particularly phosphorus limitation, remains poorly understood.
Purpose of the Study:
- To investigate the mechanisms enabling Escherichia coli biofilms to sustain colony expansion under severe phosphorus limitation.
- To elucidate the role of cell death and nutrient recycling in supporting bacterial growth in nutrient-depleted environments.
Main Methods:
- Utilized Escherichia coli biofilms to study colony expansion dynamics.
- Investigated the role of reactive oxygen species (ROS) in mediating cell death within biofilms.
- Analyzed spatial separation of cell death and growth regions.
- Compared biofilm responses to planktonic bacteria under nutrient starvation.
Main Results:
- Escherichia coli biofilms maintained steady colony expansion under severe phosphorus limitation.
- Reactive oxygen species-mediated cell death within the biofilm supported expansion.
- Cell death was spatially separated from growth regions, facilitating phosphorus recycling.
- This phenomenon was specific to phosphorus limitation and not observed with carbon or nitrogen starvation.
- Community-specific responses in cell death and growth were noted.
Conclusions:
- Bacterial communities employ spatially coordinated metabolism to overcome phosphorus limitation.
- Cell-death-mediated nutrient recycling is a key strategy for robust bacterial expansion in fluctuating environments.
- Phosphorus plays a unique role in enabling this survival strategy.
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