Catalyzes the desulfonation of aliphatic sulfonates. Seems also to be involved in the desulfurization of aromatic sulfonates. an alkanesulfonate + FMNH2 + O2 = an aldehyde + FMN + 2 H(+) + H2O + sulfite Repressed by sulfate, cysteine, or thiocyanate. FMNH(2) which is absolutely required for this enzymatic reaction, is provided by SsuE. Belongs to the SsuD family.