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The enzyme mercuric ion reductase MerA is the central component of bacterial mercury resistance encoded by the mer operon. Many MerA proteins possess metallochaperone-like N-terminal domains (NmerA) that can transfer Hg 2+ to the catalytic core domain (Core) for reduction to Hg 0 . These domains are tethered to the homodimeric Core by ∼30-residue linkers that are susceptible to proteolysis,...
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