Article

Journal of Industrial Microbiology

, Volume 14, Issue 2, pp 142-153

First online:

Theczc operon ofAlcaligenes eutrophus CH34: from resistance mechanism to the removal of heavy metals

  • Ludo DielsAffiliated withFlemish Institute for Technological Research (VITO)
  • , Qinghan DongAffiliated withFlemish Institute for Technological Research (VITO)
  • , Daniël van der LelieAffiliated withFlemish Institute for Technological Research (VITO)
  • , Wilfried BaeyensAffiliated withFlemish Institute for Technological Research (VITO)
  • , Max MergeayAffiliated withFlemish Institute for Technological Research (VITO)

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Summary

The plasmid-borneczc operon ensures for resistance to Cd2+, Zn2+ and Co2+ ions through a tricomponent export pathway and is associated to various conjugative plasmids ofA. eutrophus strains isolated from metal-contaminated industrial areas. Theczc region of pMOL30 was reassessed especially for the segments located upstream and downstream the structural genesczc CBA. In cultures grown with high concentrations of heavy metals,czc-mediated efflux of cations is followed by a process of metal bioprecipitation. These observations led to the development of bioreactors designed for the removal of heavy metals from polluted effluents.

Key words

Soil bacteria Alcaligenes Plasmid Cadmium Metal resistance Cation efflux Gene fusion Bioprecipitation Bioreactor