Characteristics of an ethidium efflux system in Enterococcus hirae
1Department of Applied Biology, University of Hull, UK.
Enterococcus hirae ATCC 9790 possesses an energy-dependent efflux system for ethidium and related cations. This system, inducible by phosphonium ions, was studied in mutants exhibiting constitutive expression and ethidium resistance.
Area of Science:
- Microbiology
- Molecular Biology
- Biochemistry
Background:
- Enterococcus hirae ATCC 9790 harbors an efflux system.
- This system transports ethidium and related cations.
- Efflux systems are crucial for microbial survival and drug resistance.
Purpose of the Study:
- To characterize the energy-dependent efflux system in Enterococcus hirae ATCC 9790.
- To investigate the induction and regulation of this efflux system.
- To isolate and study mutants with constitutive expression of the efflux system.
Main Methods:
- Detection of the efflux system in Enterococcus hirae ATCC 9790.
- Growth of the organism on complex medium and induction with phosphonium ions.
- Isolation of mutants with constitutive expression based on ethidium resistance.
Main Results:
- An energy-dependent efflux system for ethidium and related cations was identified in Enterococcus hirae ATCC 9790.
- The system's expression was partially constitutive on complex medium and induced by phosphonium ions.
- Mutants with constitutive expression displayed increased resistance to ethidium.
Conclusions:
- Enterococcus hirae ATCC 9790 possesses a regulated efflux system for ethidium and related cations.
- Phosphonium ions are potent inducers of this efflux system.
- Constitutive mutants provide valuable tools for studying efflux mechanisms and antimicrobial resistance.
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