2-oxoglutarate + CoA + 2 oxidized [2Fe-2S]-[ferredoxin] = CO2 + H(+) + 2 reduced [2Fe-2S]-[ferredoxin] + succinyl-CoA Optimum pH is 9.0. Optimum temperature is 70 degrees Celsius. Heterotetramer of the KorA, KorB, KorC and KorD subunits.