User:Cboursnell/Sandbox/AAL decarboxy

Alpha-acetolactate decarboxylase plays a dual role in the cell: (i) it catalyzes the second step of the acetoin pathway,

(S)-2-hydroxy-2-methyl-3-oxobutanoate = (R)-2-acetoin + CO2

and thus potentially the internal pH of cells and (ii) it controls the pool of alpha-acetolactate during leucine and valine synthesis.