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Myxococcus cells respond to elastic forces in their substrate.
1Departments of Biochemistry and Developmental Biology, Stanford University School of Medicine, Stanford, CA 94305-5329, USA.
Summary
Myxococcus xanthus cells exhibit elasticotaxis, sensing and responding to elastic forces by reorienting perpendicular to stress. This response is entirely dependent on adventurous motility, not social motility or frz genes.
Area of Science:
- Microbiology
- Cell Biology
- Biophysics
Background:
- Myxococcus xanthus cells exhibit complex social behaviors, including motility and swarm formation.
- Understanding cellular responses to physical forces is crucial for comprehending microbial community dynamics.
Purpose of the Study:
- To investigate the phenomenon of elasticotaxis in Myxococcus xanthus.
- To determine the genetic and motility requirements for elasticotaxis.
Main Methods:
- Application of mechanical stress to Myxococcus xanthus swarms on agar gels.
- Analysis of cell reorientation and swarm shape changes (circular to elliptical).
- Utilizing isogenic motility mutants (A-motility, S-motility, frz mutants) to assess genetic dependencies.
Main Results:
- Myxococcus xanthus cells reorient perpendicular to applied elastic forces within minutes.
- Elasticotaxis is critically dependent on adventurous (A) motility.
- Social (S) motility and frz genes are not required for elasticotaxis.
- Social motility mutants show enhanced elasticotactic response compared to wild-type.
Conclusions:
- Adventurous motility is the sole driver of elasticotaxis in Myxococcus xanthus.
- The frz genes appear to function as part of the social motility system.
- Cellular responses to physical forces are mediated by specific motility mechanisms.