Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
AQRPTase_Ne3c2eA1 A: a+b complex topologyX: alpha/beta-Hammerhead/Barrel-sandwich hybridH: alpha/beta-Hammerhead/Barrel-sandwich hybridT: Nicotinate/Quinolinate PRTase N-terminal domain-likeF: QRPTase_NECOD (1.6)
AQRPTase_Ce3c2eA2 A: a/b barrelsX: TIM beta/alpha-barrelH: TIM barrels (From Topology)T: TIM barrelsF: QRPTase_CECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

ChainDomainClassArchitectureTopologyHomologyProvenance Source (Version)
A3.90.1170.20 Alpha Beta Alpha-Beta Complex Aldehyde Oxidoreductase domain 3CATH (4.3.0)
A3.20.20.70 Alpha Beta Alpha-Beta Barrel TIM Barrel Aldolase class ICATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

ChainsAccessionNameDescriptionCommentsSource
PF02749Quinolinate phosphoribosyl transferase, N-terminal domain (QRPTase_N)Quinolinate phosphoribosyl transferase, N-terminal domainQuinolinate phosphoribosyl transferase (QPRTase) or nicotinate-nucleotide pyrophosphorylase EC:2.4.2.19 is involved in the de novo synthesis of NAD in both prokaryotes and eukaryotes. It catalyses the reaction of quinolinic acid with 5-phosphoribosyl ...Quinolinate phosphoribosyl transferase (QPRTase) or nicotinate-nucleotide pyrophosphorylase EC:2.4.2.19 is involved in the de novo synthesis of NAD in both prokaryotes and eukaryotes. It catalyses the reaction of quinolinic acid with 5-phosphoribosyl-1-pyrophosphate (PRPP) in the presence of Mg2+ to give rise to nicotinic acid mononucleotide (NaMN), pyrophosphate and carbon dioxide [1,2]. The QA substrate is bound between the C-terminal domain of one subunit, and the N-terminal domain of the other. The N-terminal domain has an alpha/beta hammerhead fold.
Domain
PF01729Quinolinate phosphoribosyl transferase, C-terminal domain (QRPTase_C)Quinolinate phosphoribosyl transferase, C-terminal domainQuinolinate phosphoribosyl transferase (QPRTase) or nicotinate-nucleotide pyrophosphorylase EC:2.4.2.19 is involved in the de novo synthesis of NAD in both prokaryotes and eukaryotes. It catalyses the reaction of quinolinic acid with 5-phosphoribosyl ...Quinolinate phosphoribosyl transferase (QPRTase) or nicotinate-nucleotide pyrophosphorylase EC:2.4.2.19 is involved in the de novo synthesis of NAD in both prokaryotes and eukaryotes. It catalyses the reaction of quinolinic acid with 5-phosphoribosyl-1-pyrophosphate (PRPP) in the presence of Mg2+ to give rise to nicotinic acid mononucleotide (NaMN), pyrophosphate and carbon dioxide [1,2]. The QA substrate is bound between the C-terminal domain of one subunit, and the N-terminal domain of the other. The C-terminal domain has a 7 beta-stranded TIM barrel-like fold.
Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

ChainsPolymerMolecular FunctionBiological ProcessCellular Component
Nicotinate-nucleotide pyrophosphorylase

Structure Motif Annotation: Mechanism and Catalytic Site Atlas M-CSA Database Homepage

ChainsEnzyme NameDescriptionCatalytic Residues
nicotinate-nucleotide pyrophosphorylase (carboxylating) (type II)  M-CSA #945

This is a type II Quinolinic acid phosphoribosyltransferase (QAPRTase).

This protein is required for the de novo biosynthesis of NAD in both prokaryotes and eukaryotes. The enzyme catalyses the reaction between quinolinic acid (QA) and 5-phosphoribosyl-1-pyrophosphate (PRPP), to yield nicotinic acid mononucleotide (NAMN), pyrophosphate and CO2, the latter resulting from decarboxylation at position 2 of the quinolinate ring.

QAPRTase has been grouped with nine other enzymes, (phosphoribosyltransferases, PRTases) that catalyse chemically similar phosphoribosyl transfer reactions using the substrate PRPP. The PRTases are involved in de novo and salvage reactions of nucleotide synthesis, as well as in histidine and tryptophan biosynthesis. Type II enzymes lack the type I PRPP-binding motif and have TIM barrel-like structure [PMID:9016724].

Defined by 1 residue: LYS:A-143 [auth A-144]
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EC: 2.4.2.19 (PDB Primary Data)