Abstract
The tellurite accumulation properties of three Escherichia coli strains containing different tellurium-resistance determinants of Gram-negative origin, from plasmids pMER610, pHH1508a and RK2, were compared. In all three cases membrane-associated tellurium crystallization was observed, and neither reduced uptake nor increased export contributed to the resistance. Specific membrane-proximal reduction is proposed as the mechanism of resistance to tellurite coded by all three determinants, despite their lack of sequence homology.
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