Iron-sulfur proteins are components of

Flavoproteins & Iron-Sulfur proteins (Fe-S) are Components of the Respiratory Chain Complexes.Iron-sulfur proteins (nonheme iron proteins, Fe-S) are found in Complexes I, II, and III. These may contain one, two, or four Fe atoms linked to inorganic sulfur atoms and/or cysteine SH groups to the protein. The Fe-S take pa in single electron transfer reactions in which one Fe atom undergoes oxidoreduction between Fe2+ and Fe3+.Reference: Harper&;s Biochemistry; 30th edition; Chapter13;The respiratory chain & Oxidative phosphorylation