ID 1.1.1.84 DE Dimethylmalate dehydrogenase. CA (R)-3,3-dimethylmalate + NAD(+) = 3-methyl-2-oxobutanoate + CO(2) + NADH. CF Cobalt or manganese; Potassium or NH(4)(+). CC -!- Also acts on (R)-malate. //