Iron-sulfur proteins electron paramagnetic resonance

Fig. 6. Electron paramagnetic resonance signal showing the g= 1.94 characteristic of the dithionite-reduced spinach ferredoxin, a plant-type iron-sulfur protein. Spectrum taken at 20 °K...

Abbreviations FAD, flavin adenine dinucleotide Fe-S, iron-sulfur proteins that can he identified in separate clusters by electron paramagnetic resonance analysis (the s-1, s-2 subscripts identify these iron-sulfur proteins as part of the succinate dehydrogenase complex) His, the histidine linkage between FAD and the large (70,000 daltons) protein moiety of the enzyme FMN, flavin mononucleotide N-la, N-2 subscripts identify these iron-sulfur proteins as part of the NADH-dehydro-genase complex UQ, ubiquinone Cyt bf and Cyt b, cytochrome b-566 and b-563, respectively. 

---