CoA + 2 oxidized [2Fe-2S]-[ferredoxin] + pyruvate = acetyl-CoA + CO2 + H(+) + 2 reduced [2Fe-2S]-[ferredoxin] Heterotetramer of one alpha, one beta, one delta and one gamma chain. There seems to be a sequencing error that fuses together porC and porD. We have cut the ORF into its two constituents.