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2 Acetohydroxy 3 Ketoacid Isomeroreductase

An enzyme involved in the biosynthesis of Isoleucine and Valine. It converts 2-acetolactate into 3-hydroxy-2-oxo-isovalerate. Also acts on 2-hydroxy-2-acetobutyrate to form 2-hydroxy-2-oxo-3-methylvalerate. EC 5.4.99.3.