Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 129, Issue 17, Pages 5352-+Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja0708013
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Funding
- NIGMS NIH HHS [GM28962] Funding Source: Medline
- NINDS NIH HHS [NS27583, R01 NS027583] Funding Source: Medline
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Modified His-His dipeptides have been reacted with copper(I) salts to model active-site Cu ions bound by contiguous His residues in certain oxygen-activating copper proteins, as well as amyloid beta-peptide. Chelation of copper(I) by these ligands affords linear, two-coordinate complexes as studied structurally by X-ray absorption spectroscopy. The complexes are robust toward oxidation, showing limited to no reactivity with O-2, and they bind CO weakly. Reaction with a third ligand (N-methylimidazole) affords complexes with a markedly different structure (distorted T-shaped) and reactivity, binding CO and oxidizing rapidly upon exposure to dioxygen.
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