2 reduced [4Fe-4S]-[ferredoxin] + an aldehyde + sulfite + 3 H(+) => an aliphatic sulfonate + 2 oxidized [4Fe-4S]-[ferredoxin] + H2O
2 reduced [4fe-4s]-[ferredoxin] + an aldehyde + sulfite + 3 h(+) => an aliphatic sulfonate + 2 oxidized [4fe-4s]-[ferredoxin] + h2o