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Cu(I) transfer from Cu(I)-TtSco1 to Apo-COX II*2SH followed by NMR. 1H-15N HSQC spectra of COX II*2SH (green) and upon addition of two equivalents of Cu(I)-TtSco1 (pink), showing that TtSco1 is not able to transfer Cu(I) ions to the oxidase. The position of the expected cross peaks corresponding to the holo form protein absent in the final spectrum are indicated in blue.
