Structure and magnetism of iron-sulfur clusters in proteins |
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Authors: | Eckard Münck Thomas A Kent |
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Institution: | (1) Gray Freshwater Biological Institute, University of Minnesota, 55392 Navarre, Minnesota, USA |
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Abstract: | Iron-sulfur clusters are mixed-valence systems exhibiting both localized and delocalized valence states. We discuss here spin-coupling
models for two types of oxidized 3Fe-4S] clusters with localized Fe3+ valence states; a Heisenberg Hamiltonian with isotropic antiferromagnetic exchange fits the data well. Reduced 3Fe-4S] clusters,
on the other hand, contain a trapped Fe3+ site and a delocalized Fe3+-Fe2+ pair. The pair has spin S12=9/2 (formally ferromagnetic coupling) and is antiferromagnetically coupled to the Fe3+ S3=5/2 spin to yield a system spin S=2. We discuss also recent results for 4Fe-4S] clusters such as 3Fe-4S]→4Fe-4S] conversions,
incorporation of other metals into the iron-sulfur core, and the observation of novel spin states. |
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