ID 1.5.1.23 DE Tauropine dehydrogenase. CA Tauropine + NAD(+) + H(2)O = taurine + pyruvate + NADH. CC -!- In the reverse reaction, alanine can act instead of taurine, more CC slowly, and 2-oxobutanoate and 2-oxopentanoate can act instead of CC pyruvate. //