coenzyme B + 2 oxidized coenzyme F420-(gamma-L-Glu)(n) + coenzyme M + 2 reduced [2Fe-2S]-[ferredoxin] + 4 H(+) = coenzyme M-coenzyme B heterodisulfide + 2 reduced coenzyme F420-(gamma-L-Glu)(n) + 2 oxidized [2Fe-2S]-[ferredoxin] — reaction