Acts as an alpha-ketoglutarate-dependent dioxygenase active on sulfonates. Although taurine is a poor substrate, a variety of other sulfonates are utilized, with the best natural substrates being isethionate and taurocholate. Binds 1 Fe(2+) ion per subunit. Organosulfur degradation; alkanesulfonate degradation. Belongs to the TfdA dioxygenase family.