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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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Coordination environment for the type 3 copper center of tree laccase and CuB of cytochrome c oxidase as determined by electron nuclear double resonance.

A new rhombic EPR signal was recently discovered in the partially reduced type 2 copper-depleted Rhus vernicifera laccase (Reinhammar, B. (1983) J. Inorg. Biochem., in press). The signal originates from one of the type 3 Cu(II) ions that becomes EPR-detectable as a result of the selective reduction of the other copper ion in the exchange-coupled Cu(II)-Cu(II) pair. The 14N and 1H and 63,65Cu electron nuclear double resonance (ENDOR) of this uncoupled Cu(II) now have been collected and represent the first ENDOR measurements of a type 3 copper site. The data indicate that the copper is coordinated by at least three nitrogenous ligands, at least one of which is an imidazole. H/D exchange suggests a nearby H2O or OH-, perhaps as a fourth ligand. A similar EPR signal is seen for CuB of reduced cytochrome c oxidase under turnover conditions. The 14N ENDOR, and, therefore, the structure, of this site corresponds extremely closely to that of the laccase type 3 (Cu(II).[1]

References

  1. Coordination environment for the type 3 copper center of tree laccase and CuB of cytochrome c oxidase as determined by electron nuclear double resonance. Cline, J., Reinhammar, B., Jensen, P., Venters, R., Hoffman, B.M. J. Biol. Chem. (1983) [Pubmed]
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