Bacteria differently deploy type-IV pili on surfaces to adapt to nutrient availability.
Lei Ni1, Shuai Yang1, Rongrong Zhang1
1Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, Department of Polymer Science and Engineering, CAS Key Laboratory of Soft Matter Chemistry, University of Science and Technology of China, Hefei, China.
NPJ Biofilms and Microbiomes
|July 20, 2017
Summary
Pseudomonas aeruginosa bacteria change their movement using type-IV pili (TFP) based on nutrient availability. This allows them to form biofilms strategically, enhancing survival in varied environments.
Area of Science:
- Microbiology
- Bacterial Motility
- Biofilm Formation
Background:
- Bacterial biofilm structure is influenced by environmental factors like nutrient availability.
- Motility differences in bacteria during early biofilm formation contribute to structural variations.
- How individual bacteria alter motility for different life cycle outcomes is not well understood.
Purpose of the Study:
- To investigate how Pseudomonas aeruginosa modifies its motility in response to varying nutrient conditions at the single-cell level.
- To understand the role of type-IV pili (TFP) in bacterial motility modulation.
- To correlate motility behaviors with the localization of the FimX protein.
Main Methods:
- Utilized high-throughput algorithms to track thousands of P. aeruginosa cells.
- Analyzed bacterial movement on surfaces under different nutrient conditions.
- Developed a minimal stochastic model to reproduce observed TFP-driven motility types.
Main Results:
- Identified four distinct motility types in P. aeruginosa based on TFP deployment.
- Observed that bacteria exhibit unidirectional crawling in nutrient-limited conditions and stall in nutrient-supplemented conditions.
- Found a correlation between motility types and the subcellular localization of FimX, with asymmetric FimX distribution linked to unidirectional crawling.
Conclusions:
- P. aeruginosa differentially deploys TFP symmetrically or asymmetrically to modulate motility behaviors based on nutrient availability.
- The subcellular distribution of FimX influences TFP assembly and bacterial motility.
- Strategic biofilm formation in nutrient-rich areas enhances the competitive capacity of P. aeruginosa in diverse environments.
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