2.2.1.6 2 pyruvate - 2.2.1.6 2 pyruvate acetohydroxyacid synthase is the enzyme that catalyses the first step in the common pathway of the biosynthesis of the branched chain amino acids, valine, leucine and isoleucine 2.2.1.6 2 pyruvate AHAS catalyzes the first common step in the biosynthetic pathway of the branched-amino acids leucine, isoleucine, and valine 2.2.1.6 2 pyruvate irreversible decarboxylation of pyruvate 2.2.1.6 2 pyruvate the enzyme produces 2-acetolactate in a temperature-dependent manner 2.2.1.6 2-oxobutyrate - 2.2.1.6 2-oxobutyrate + pyruvate - 2.2.1.6 2-oxoisovalerate - 2.2.1.6 additional information mechanism of expression regulation, overview 2.2.1.6 additional information regulatory role of the proteins of the phosphoenolpyruvate:carbohydrate phosphotransferase system, requirement of the dephospho-form of enzyme IIANtr, encoded by gene ptsN, for derepression of Escherichia coli K-12 ilvBN expression, overview