ID 1.1.1.76 DE (S,S)-butanediol dehydrogenase. CA (S,S)-butane-2,3-diol + NAD(+) = (S)-acetoin + H(+) + NADH. CC -!- This enzyme catalyzes the reversible reduction of (S)-acetoin to CC (S,S)-butane-2,3-diol. CC -!- It can also catalyze the irreversible reduction of diacetyl to (S)- CC acetoin. DR Q9ZNN8, BUDC_CORGT ; //