. "\"Catalysis of the reaction: trithionate + acceptor + 2 H2O + OH- = 3 HSO3- + reduced acceptor.\" [EC:1.8.99.3]" . . "hydrogensulfite reductase activity" . "bisulfite reductase activity" . "dissimilatory sulfite reductase activity" . "dissimilatory-type sulfite reductase activity" . "hydrogensulphite reductase activity" . "trithionate:(acceptor) oxidoreductase activity" . "trithionate:acceptor oxidoreductase activity" . "EC:1.8.99.3" . "MetaCyc:HYDROGENSULFITE-REDUCTASE-RXN" . "RHEA:13212" . "UM-BBD_reactionID:r0627" . . "desulfofuscidin activity" . "desulforubidin activity" . "desulfoviridin activity" .