Figure 26.

Representative spectra of [4Fe–4S] proteins. (a, left) UV–vis of the oxidized form. Reprinted with permission from ref (760) Copyright 2005 Springer-Verlag. (b, middle) EPR of the [4Fe–4S]¹⁺ state. Reprinted with permission from ref (761). Copyright 1999 Elsevier. (c, right) Mössbauer of the [4Fe−4S]²⁺ cluster of the E. coli FNR protein, T = 4.2 K (top), and the [4Fe−4S]¹⁺ cluster of E. coli sulfite reductase, T = 110 K (bottom). Reprinted with permission from ref (529). Copyright 1997 American Association for the Advancement of Science.