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Improved biocatalysts for mercury (Hg) remediation were generated by random mutagenesis ofPseudomonas putida with a minitransposon containingmerTPAB , the structural genes specifying organomercury resistance. Subsequent selection for derivatives exhibiting elevated resistance levels to phenylmercury allowed the isolation of strains that constitutively expressmerTPAB at high levels, conferring the ability to cleave Hg from an organic moiety and reduce the freed Hg(II) to the less toxic elemental form, Hg0 , at greater rates. Constitutive overexpression ofmerTPAB had no apparent effect on culture growth rates, even when Hg(II) was initially present at otherwise toxic concentrations. These properties were also combined with benzene and toluene catabolism, allowing detoxification of the metal component of phenyl mercuric acetate, as well as degradation of its aromatic moiety.

Pseudomonas putida Strains Which Constitutively Overexpress Mercury Resistance for Biodetoxification of Organomercurial Pollutants