Thiosulphate dehydrogenase (TsdA) catalyses the oxidation of two thiosulphate molecules to form tetrathionate and is predicted to use an unusual cysteine-ligated heme as the catalytic cofactor. Thiosulfate and polythionates serve as energy-yielding or electron-donating substrates in the metabolism of a wide range of chemolithotrophic and photolithotrophic bacteria, as well as some heterotrophs. This reaction is interesting because of its potential applications in bioleaching and metal solubilisation.
Defined by 4 residues: ARG:A-82 [auth A-109]ARG:A-92 [auth A-119]CYS:A-96 [auth A-123]SER:A-100 [auth A-127]