STRUCTURAL STUDIES AND MÖSSBAUER SPECTRA OF FE4S4CLUSTER SYSTEMS: BIOLOGICAL IMPLICATIONS OF THESE RESULTS

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Abstract
The structural arrangement of the iron-sulfur centers in the non-heme iron-sulfur proteins has been the subject of extensive physical investigations.1–4 Particular emphasis has been placed on the “ferredoxins” which have seven or eight iron atoms and eight or more sulfur atoms per protein unit. Several workers5–7 have proposed that the iron-sulfur cluster compounds of composition [Fe4S4L4] n- , where L=S2C2(CF3)2, may be useful model systems for the ferrodoxins. We report here a brief description of the structural parameters for the Fe4S4L4 −2 cluster and the Mössbauer data for the three derivatives, n=0, 1, 2. The data are compared with that reported for inorganic cluster systems of known structure and with the available data on non-heme iron-sulfur proteins.