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. 2015 May 27;5:10518. doi: 10.1038/srep10518

Figure 1. Illustration of 2-step Cu transfer from Atox1 to WD4 showing two intermediate protein heterocomplexes with different Cu-cysteine coordinations.

Figure 1

Out of four possible tri-coordinate Cu+-cysteine complexes, only two (the ones shown) are observed in vitro. Purple: Atox1; green: WD4; yellow: Cys residues in metal-binding motifs.