Mossbauer spectroscopy iron metabolism

B. F. Matzanke, Mossbauer Spectroscopy of Microbial Iron Uptake and Metabolism, in Iron Transport in Microbes, Plants and Animals , eds. G. Winkehnann, D. van der Helm, and J. B. Neilands, VCH, Weinheim, 1987, p. 251. 

Iron-sulfur clusters are versatile electron transfer cofactors, which are ubiquitous in many metalloenzymes. In the Bacillus subtilis, redox regulator (Fnr) that controls genes of the anaerobic metabolism in response to low oxygen tension, an unusual structure for the oxygen-sensing [4Fe-4S] " cluster was detected by a combination of genetic experiments with UV-visible and Mossbauer spectroscopy [79]. Asp-141 was identified as the fourth iron-sulfur cluster ligand besides three Cys residues. 

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