title: Mechanism of formation, spectrum and reactivity of half-reduced eight-iron Clostridium pasteurianum ferredoxin in pulse-radiolysis studies and the non-co-operativity of the four-iron clusters.
abstract: Reduction of fully oxidized Clostridium pasteurianum 8-Feox.,ox. ferredoxin by using pulse-radiolysis techniques yields the half-reduced species 8-Feox.,red. ferredoxin. The subsequent oxidation of 8-Feox.,red. ferredoxin with Co(NH3)5Cl2+ was studied. From a comparison with stopped-flow studies on the 2:1 Co(NH3)5Cl2+ oxidation of 8-Fered.,red. ferredoxin to the 8-Feox.,ox. form it is concluded that there is no redox co-operativity between the two 4-Fe centres in these reactions.
mesh_terms: D055598:Chemical Phenomena; D002621:Chemistry; D003013:Clostridium / Q000032:analysis*; D005288:Ferredoxins; D007700:Kinetics; D010084:Oxidation-Reduction; D011675:Pulse Radiolysis
chemical_list: D005288:Ferredoxins