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Proposed pathway for the degradation of DTDB in R. erythropolis strain MI2. DTDB is initially cleaved by the NADH:flavin oxidoreductase (Nox) into 2 molecules of 4-mercaptobutyric acid, which is then probably oxidized by a putative oxygenase, yielding 4-oxo-4-sulfanylbutyric acid. Afterwards, the sulfur moieties could be removed by a putative desulfhydrase as volatile hydrogen sulfide. The resulting succinic acid is then further metabolized.
