The redox potentials of the two-iron plant and algal ferredoxins. An electrostatic model.
The two-iron-sulphur co-ordination centre in plant and algal ferredoxins is considered as a collection of charged ions whose net negative charge is twice that of the one-iron-sulphur protein rubredoxin. Calculation of the electrostatic free-energy changes for reduction of the two types of proteins indicates that the redox potential of the two-iron-sulphur proteins should be more negative than that of the one-iron-sulphur protein and that in biological systems the ferredoxins should function as one-electron transfer proteins.
D055598:Chemical Phenomena; D002621:Chemistry; D004579:Electron Transport; D056890:Eukaryota; D005288:Ferredoxins; D007501:Iron; D008433:Mathematics; D008956:Models, Chemical; D010084:Oxidation-Reduction; D010944:Plants; D011199:Potentiometry; D013455:Sulfur
D005288:Ferredoxins; D013455:Sulfur; D007501:Iron