Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Paramagnetic Inversion of the Sign of the Interference Contribution to the Transverse Relaxation of the Imido Protons of the Coordinated Imidazoles in the Uniformly $^{15}N$ Labeled Cytochrome $c_3$

  • Published : 20011100
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Abstract

In the spectrum of uniformly 15N labeled cytochrome c3, the relative linewidths of the doublet peaks of the 15N-coupled imido proton of the coordinated imidazole group were reversed on oxidation. This inversion was explained by the interference relaxation process between the electron-proton dipolar and 15N-1H dipolear interactions. The inversion can be used to assign the imido protons of the coordinated imidazole groups in heme proteins.

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