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The theoretical approach to the understanding of the NMR parameters in paramagnetic exchange coupled dimers is discussed and simplified formulas are provided. The effect of magnetic coupling on electron relaxation times in magnetic coupled heterodimetallic systems is also discussed. The 1H NMR spectra of two oxidized and reduced Fe2S2-ferredoxins are interpreted and structural information is obtained...
The aim of this article is to critically discuss the information available on the influence of the protein environment on the electron transfer properties of Fe-S proteins. First, the intrinsic redox and structural features of synthetic Fe-S clusters are illustrated, in order to provide a background on which the effects of the protein matrix can be subsequently highlighted. The parameters found to...
Iron-sulfur polymetallic centers pose interesting questions on the oxidation state of each metal ion, on the possibility of electron delocalization over the metal ions versus the possibility of existence of equilibria among different localized-valence states, and on the factors determining if, and to what extent, electron delocalization is present. By interpreting the hyperfine coupling of unpaired...
The structural diversity of the proteins and glycoproteins forming the extracellular matrix (ECM) has prompted the evolution and diversification of the human matrix metalloproteinases (MMPs). The sequence of events occurring at the active site of MMPs while functioning has been largely revealed by investigating the hydrolysis of peptide models. The conformational rearrangement of the active site,...
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