>gnl|CDD|132915 cd06586, TPP_enzyme_PYR, Pyrimidine (PYR) binding domain of thiamine pyrophosphate (TPP)-dependent enzymes. Thiamine pyrophosphate (TPP) family, pyrimidine (PYR) binding domain; found in many key metabolic enzymes which use TPP (also known as thiamine diphosphate) as a cofactor. TPP binds in the cleft formed by a PYR domain and a PP domain. The PYR domain, binds the aminopyrimidine ring of TPP, the PP domain binds the diphosphate residue. A polar interaction between the conserved glutamate of the PYR domain and the N1' of the TPP aminopyrimidine ring is shared by most TPP-dependent enzymes, and participates in the activation of TPP. The PYR and PP domains have a common fold, but do not share strong sequence conservation. The PP domain is not included in this group. Most TPP-dependent enzymes have the PYR and PP domains on the same subunit although these domains can be alternatively arranged in the primary structure. In the case of 2-oxoisovalerate dehydrogenase (2OXO), sulfopyruvate decarboxylase (ComDE), and the E1 component of human pyruvate dehydrogenase complex (E1- PDHc) the PYR and PP domains appear on different subunits. TPP-dependent enzymes are multisubunit proteins, the smallest catalytic unit being a dimer-of-active sites. For many of these enzymes the active sites lie between PP and PYR domains on different subunits. However, for the homodimeric enzymes 1-deoxy-D-xylulose 5-phosphate synthase (DXS) and Desulfovibrio africanus pyruvate:ferredoxin oxidoreductase (PFOR), each active site lies at the interface of the PYR and PP domains from the same subunit. Length = 154

 Score = 75.5 bits (186), Expect = 3e-14
 Identities = 40/168 (23%), Positives = 61/168 (36%), Gaps = 19/168 (11%)

Query: 148 DAIAEEMRRDKDVFIMGEEVAEYQGAYKVTQGLLQEFGCERVIDTPITEHGFAGIGIGAS 207
            A AE +       + G    E           L+E G +R+IDT I E G AG   G +
Sbjct: 1   AAFAEVLTAWGVRHVFGYPGDEISSLL----DALRE-GDKRIIDTVIHELGAAGAAAGYA 55

Query: 208 FAGLKPIVEFMTFNFAMQAIDQIINSAAKTRYMSGGQITTSIVFR-GPNGAAARV-AAQH 265
            AG  P+V   +    + AI+ + ++AA+            +VF  G  G +A+      
Sbjct: 56  RAGGPPVVIVTSGTGLLNAINGLADAAAE---------HLPVVFLIGARGISAQAKQTFQ 106

Query: 266 SQCYAAWYSHVPGLKVVIPYTASDAKGLLKAAIRD---PNPVIFLENE 310
           S      Y  +P   +  P  A    G+  A         PV+     
Sbjct: 107 SMFDLGMYRSIPEANISSPSPAELPAGIDHAIRTAYASQGPVVVRLPR 154