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Copper export: PcoA and PcoC are soluble proteins expressed to the periplasm as part of the copper-resistance response of E. coli. PcoC binds both CuI and CuII to form air-stable CuICuII-PcoC. The blue multicopper oxidase PcoA has been shown to catalyze oxidation of CuI bound in CuICuII-PcoC to less toxic CuII, which is released into solution. These two proteins may interact with the outer membrane protein PcoB to export excess copper from the periplasm.
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Djoko et al. (2008) studied this question.
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