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Updated: Dec 18, 2025
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Fluorescence Live-cell Imaging of the Complete Vegetative Cell Cycle of the Slow-growing Social Bacterium Myxococcus xanthus
Published on: June 20, 2018
9.9K
Modulation of bacterial multicellularity via spatio-specific polysaccharide secretion
Salim T Islam1,2,3, Israel Vergara Alvarez3, Fares Saïdi1,2,3
1Armand Frappier Health & Biotechnology Research Centre, Institut National de la Recherche Scientifique, Université du Québec, Institut Pasteur International Network, Laval, Québec, Canada.
Plos Biology
|June 10, 2020
Summary
Myxococcus xanthus bacteria use a novel biosurfactant polysaccharide (BPS) to coordinate multicellular behaviors like swarm migration and biofilm formation. This secreted molecule plays a key role in bacterial community development and survival.
Area of Science:
- Microbiology
- Evolutionary Biology
- Biochemistry
Background:
- Multicellularity is a crucial evolutionary step enabling complex behaviors and survival advantages in bacteria.
- The social bacterium Myxococcus xanthus exhibits sophisticated community structures and developmental processes.
Purpose of the Study:
- To investigate the role of secreted polysaccharides in coordinating multicellular behaviors in Myxococcus xanthus.
- To identify and characterize a novel biosurfactant polysaccharide (BPS) involved in bacterial community dynamics.
Main Methods:
- Analysis of BPS structure and composition, including its linkage and acetylation patterns.
- Investigating the spatial modulation of BPS and exopolysaccharide (EPS) production within bacterial communities.
- Examining the impact of BPS on type IV pilus (T4P) activity and its role in swarm migration and biofilm formation.
Main Results:
- A novel biosurfactant polysaccharide (BPS), an acidic polymer, is secreted by Myxococcus xanthus.
- BPS production is spatially regulated, favoring the swarm interior, while EPS is produced at the periphery.
- BPS influences swarm migration, multicellular biofilm formation, and fruiting body development, distinct from EPS functions.
Conclusions:
- Secreted polysaccharides, specifically BPS, are central to coordinating intricate behaviors in bacterial multicellularity.
- The differential production of BPS and EPS contributes to the complex spatial organization and collective behaviors of Myxococcus xanthus communities.
- Understanding these polysaccharide-mediated mechanisms provides insights into the evolution of bacterial sociality and development.
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