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thiamine pyrophosphate-dependent enzyme
thiamine pyrophosphate-binding protein
Thiamine pyrophosphate enzyme, central domain
The central domain of TPP enzymes contains a 2-fold Rossman fold. [1]. 8604141. Crystal structure of the thiamin diphosphate-dependent enzyme pyruvate decarboxylase from the yeast Saccharomyces cerevisiae at 2.3 A resolution. Arjunan P, Umland T, Dyda F, Swaminathan S, Furey W, Sax M, Farrenkopf B, Gao Y, Zhang D, Jordan F;. J Mol Biol 1996;256:590-600. (from Pfam)
acetolactate synthase AlsS
acetolactate synthase
acetolactate synthase (ALS) catalyzes the first step in the synthesis of the branched-chain amino acids (valine, leucine, and isoleucine)
Acetolactate synthase (EC 2.2.1.6) combines two molecules of pyruvate to yield 2-acetolactate with the release of CO2. This reaction may be involved in either valine biosynthesis (biosynthetic) or conversion of pyruvate to acetoin and possibly to 2,3-butanediol (catabolic). The biosynthetic type, described by TIGR00118, is also capable of forming acetohydroxybutyrate from pyruvate and 2-oxobutyrate for isoleucine biosynthesis. The family described here, part of the same larger family of thiamine pyrophosphate-dependent enzymes (PF00205, PF02776) is the catabolic form, generally found associated with in species with acetolactate decarboxylase and usually found in the same operon. The model may not encompass all catabolic acetolactate synthases, but rather one particular clade in the larger TPP-dependent enzyme family.
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