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Mercury-mediated toxicity remains one of the greatest barriers against microbial survival, even though bacterial resistance to mercury compounds can occur. However, the genetic and physiological adaptations of bacteria to mercury stress still remains unclear. Here, we show that the marine bacterium  Pseudomonas stutzeri  273 is resistant to 50 μM Hg 2+  and removes up to 94% Hg 2+  from culture. Using gene homologous recombination and complementation, we show that genes encoding Hg 2+ -transport proteins MerT, MerP, the mercuric reductase MerA and the regulatory protein MerD are essential for bacterial mercuric resistance when challenged with Hg 2+ . Further, mercury stress inhibits flagellar development, motility, chemotaxis and biofilm formation of  P. stutzeri  273, which are verified by transcriptomic and physiological analyses. Surprisingly, we discover that MerF, a previously reported Hg 2+ -transporter, determines flagellar development, motility and biofilm formation in  P. stutzeri  273 by genetic and physiological analyses. Our results strongly indicate that MerF plays an integral role in  P. stutzeri  273 to develop physiological responses to mercury stress. Notably, MerF homologs are also prevalent in different human pathogens. Using this unique target may provide novel strategies to control these pathogenic bacteria, given the role of MerF in flagella and biofilm formation. In summary, our data provide an original report on MerF in bacterial physiological development and suggest that the  mer  in marine bacteria has evolved through progressive, sequential recruitment of novel functions over time.

Genetic and Physiological Adaptations of Marine Bacterium Pseudomonas stutzeri 273 to Mercury Stress