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The conformational change induced by binding in the horizontal helix and TM8 of CusA. The apo-CusA structure (yellow) and Cu(I)-bound (green) CusA are superimposed, together with the bound Cu(I) (pink). The blue mesh indicates the anomalous signal of bound Cu(I) (contoured at 8 σ). In the proximity of copper, residues M573, M623, and M672 are closely coordinated and this transient binding site is revealed to the periplasm.
