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Autocides produced by Myxococcus xanthus.
Journal of Bacteriology
|December 1, 1984
Summary
Myxococcus xanthus produces autocides, substances bactericidal to itself but not other bacteria. These compounds, isolated into five fractions, show varied mechanisms of action and potential roles in bacterial development.
Area of Science:
- Microbiology
- Bacterial Physiology
- Biochemistry
Background:
- Myxococcus xanthus exhibits complex developmental behaviors, including programmed cell lysis.
- Bacterial self-toxicity mechanisms are crucial for population dynamics and development.
Purpose of the Study:
- To isolate and characterize autocidal substances produced by Myxococcus xanthus.
- To investigate the specific activity and modes of action of these autocides.
Main Methods:
- Ethanol extraction of Myxococcus xanthus cultures.
- Sequential-column and thin-layer chromatography for fraction isolation.
- Bactericidal assays against homologous and heterologous strains, including yeasts.
Main Results:
- Five active fractions (AM I-V) were isolated, showing high specificity for Myxococcus xanthus.
- AM I inhibited growth at low concentrations and caused lysis at high concentrations.
- AM IV induced rapid cell death and lysis, while AM V exhibited a distinct killing mechanism without immediate lysis.
- Fractions showed activity in both buffer and growth medium.
Conclusions:
- Myxococcus xanthus produces specific autocidal compounds with diverse mechanisms.
- These autocides may play a role in the developmental lysis observed in this bacterium.
- Further research into autocide function can elucidate bacterial developmental processes.