Abstract
The relative intensity of Calpha-C' cross-peaks in homonuclear 13C COSY spectra depends on the relaxation properties of Calpha and C' spins, which, in the proximity of a paramagnetic center, are related to the metal-to-carbon distance. Their quantitative analysis has lead, for the cerium-substituted dicalcium protein, calbindin D9k, to the straightforward identification of peaks arising from metal-coordinating groups. The monodentate or bidentate metal binding mode of carboxylates was identified directly via NMR.
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