Abstract
EXAFS analysis of met T2D Rhus laccase and its azide bound derivative indicates an average of 0.33 S at 2.09 Å and 3–4 N (or O) atoms at 2.00 Å per copper atom for the three copper centers. Using the plastocyanin Cu(II) EXAFS spectrum to model the type 1 site in laccase, a difference EXAFS spectrum for the type 3 site is generated; this spectrum enables assignment of the one S ligand in met T2D to the type 1 site and indicates no evidence of a detectable copper scatterer for the coupled binuclear copper site. Implications regarding type 3 optical features and related studies on the hemocyanins are also discussed.
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