Geobacillus stearothermophilus LV cadA gene mediates resistance to cadmium, lead and zinc in zntA mutants of Salmonella entérica serovar Typhimurium.
Salmonella entérica serovar Typhimurium cells expressing the cadA gene of Geobacillus stearothermophilus LV exhibit a hypersensitive phenotype to cadmium chloride. Deletion of the ORF STM3576 from the Salmonella genome resulted in cadmium, lead and zinc sensitivity, confirming that this ORF is a homologue of the zntA gene. The observed sensitivity was reverted upon expression of the G. stearothermophilus LV cadA gene. These results indicate that the cadA gene product is involved in Cd, Pb and Zn resistance as a classical P-type ATPase and strongly suggest that the observed hypersensitive phenotype to these metals can be related to the function of the host .zntA gene product.
Laboratorio de Microbiología Molecular, Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile. cvasquez@usach.cl
José M
JM
Pérez
Gonzalo A
GA
Pradeñas
Claudio A
CA
Navarro
Daniel R
DR
Henríquez
Sergio E
SE
Pichuantes
Claudio C
CC
Vásquez
D000251:Adenosine Triphosphatases / Q000235:genetics*; D002104:Cadmium / Q000378:metabolism / Q000633:toxicity; D024881:Drug Resistance, Bacterial / Q000235:genetics; D015964:Gene Expression Regulation, Bacterial; D001411:Geobacillus stearothermophilus / Q000235:genetics*; D007854:Lead / Q000378:metabolism / Q000633:toxicity; D009154:Mutation; D010641:Phenotype; D012486:Salmonella typhimurium / Q000187:drug effects* / Q000201:enzymology / Q000235:genetics; D015032:Zinc / Q000378:metabolism / Q000633:toxicity
D002104:Cadmium; D007854:Lead; D000251:Adenosine Triphosphatases; C109898:Zn(II)-translocating P-type ATPase; C059771:cadmium translocating ATPase; D015032:Zinc