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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 3 large subunit
acetolactate synthase 3 large subunit is the catalytic subunit of the dimeric enzyme acetolactate synthase, which catalyzes the condensation of two molecules of pyruvate to give the acetohydroxyacid, 2-acetolactate, the precursor of the branched chain amino acids, valine, isoleucine, and leucine
biosynthetic-type acetolactate synthase large subunit
Two groups of proteins form acetolactate from two molecules of pyruvate. The type of acetolactate synthase described in this model also catalyzes the formation of acetohydroxybutyrate from pyruvate and 2-oxobutyrate, an early step in the branched chain amino acid biosynthesis; it is therefore also termed acetohydroxyacid synthase. In bacteria, this catalytic chain is associated with a smaller regulatory chain in an alpha2/beta2 heterotetramer. Acetolactate synthase is a thiamine pyrophosphate enzyme. In this type, FAD and Mg++ are also found. Several isozymes of this enzyme are found in E. coli K12, one of which contains a frameshift in the large subunit gene and is not expressed.
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