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Tetrachloroethene Reductive Dehalogenase is an enzyme that catalyzes the chemical reaction trichloroethene + chloride + acceptor ⇌ tetrachloroethene + reduced acceptor. The 3 substrates of this enzyme are trichloroethene, chloride, and acceptor, whereas its two products are tetrachloroethene and reduced acceptor. This enzyme belongs to the family of oxidoreductases. This enzyme is also called tetrachloroethene reductase. This enzyme participates in tetrachloroethene degradation. Note that the physiologically relevant reaction actually occurs in the reverse direction from that shown above. In other words, in the bacterial species where this enzyme is found, tetrachloroethene is reductively dechlorinated to trichloroethene and chloride. This enzyme is one member of a family of enzymes including trichloroethene dehalogenase and vinyl chloride dehalogenase. The other members of this family do not have their own EC numbers at present.