an aldehyde + 2 oxidized [2Fe-2S]-[ferredoxin] + H2O => a carboxylate + 2 reduced [2Fe-2S]-[ferredoxin] + 3 H(+)
an aldehyde + 2 oxidized [2fe-2s]-[ferredoxin] + h2o => a carboxylate + 2 reduced [2fe-2s]-[ferredoxin] + 3 h(+)