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The prosthetic groups in succinate dehydrogenase. Number and stoichiometry.

Biochimica et Biophysica Acta, 01 Mar 1980, 612(1):11-28
https://doi.org/10.1016/0005-2744(80)90274-0 PMID: 6244847 

Abstract 

I. Succinate:Q oxidoreductase (EC 1.3.99.1) as present in beef-heart submitochondrial particles contains equal amounts of FAD, a [2Fe-2S] cluster and a [4Fe-4S] cluster. Both Fe-S clusters are reducible by succinate. 2. A second type of [2Fe-2S] cluster, called center S-2, that has been proposed to be present in purified preparations of succinate dehydrogenase and isolated Complex II (Ohnishi, T., Winter, D.B., Lim, J. and King, T.E. (1973) Biochem. Biophys. Res. Commun. 53, 231--237) is an artifact introduced by the purification procedure. 3. It is suggested that the 70 000 dalton subunit which is known to bind the flavin, accomodates also the [4Fe-4S] cluster whereas the 28 000 dalton subunit contains the [2Fe-2S] cluster.

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