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Mutagenicity of a series of hexacoordinate rhodium(III) compounds
Abstract:
19 rhodium(III) compounds have been tested for genetic damaging capabilities using an Escherichia coli differential repair assay and for mutagenicity in the strains of Salmonella typhimurium. 10 of these were active in both assays. Presence of the plasmid pKM101 was required for mutagenicity in Salmonella. Both the composition of the ligands and the free-dimensional structures of the coordination complexes profoundly affect genetic activity. In general, the structure--activity relationships appear to favor complexes with (1) a +1 charge, (2) 2-relatively labile leaving groups with 4 more strongly bonded amine ligands, and (3) a relatively slow rate of exchange of the ligands which is characteristic of substitutionally inert coordination complexes.
Insights
Nineteen rhodium(III) compounds were tested for genetic damage. Ten compounds showed activity in both bacterial assays, with ligand structure significantly influencing genotoxicity.
Area of Science:
- Coordination Chemistry
- Genotoxicity Testing
- Microbial Assays
Background:
- Rhodium compounds are increasingly studied for various applications.
- Understanding the genotoxic potential of metal complexes is crucial for safety assessments.
- Bacterial assays are standard tools for initial screening of genetic damage.
Purpose of the Study:
- To evaluate the genetic damaging capabilities of 19 rhodium(III) compounds.
- To investigate the mutagenicity of these compounds in bacterial models.
- To establish structure-activity relationships for rhodium(III)-induced genotoxicity.
Main Methods:
- Utilized an Escherichia coli differential repair assay to assess genetic damage.
- Employed Salmonella typhimurium strains to evaluate mutagenicity.
- Analyzed the influence of plasmid pKM101 presence on mutagenic activity.
Main Results:
- 10 out of 19 rhodium(III) compounds exhibited activity in both assays.
- Mutagenicity in Salmonella typhimurium was dependent on the presence of the plasmid pKM101.
- Ligand composition and the three-dimensional structure of complexes significantly impacted genetic activity.
Conclusions:
- Specific structural features, including a +1 charge, labile leaving groups, and inert ligand exchange rates, favor genotoxic activity in rhodium(III) complexes.
- The findings provide insights into the design of potentially less genotoxic rhodium compounds.
- Bacterial assays are effective for screening the genotoxicity of coordination complexes.