PPAT polyclonal antibody

Atase (amidophosphoribosyltransferase), also known as PPAT (phosphoribosyl pyrophosphate (PRPP) amidotransferase), PRAT or GPAT (glutamine phosphoribosyl pyrophosphate amidotransferase), is a ubiquitously expressed N-terminal nucleophile-type glutamine amidotransferase that belongs to the purine/pyrimidine phosphoribosyltransferase family. Existing as a homotetramer, Atase plays an important role in purine metabolism. More specifically, Atase functions as regulatory enzyme and contains one glutamine amidotransferase type-2 domain. Binding a magnesium ion and a 4Fe-4S cluster as cofactors, Atase catalyzes the first step (the rate-limiting step) in the purine nucleotide biosynthesis pathway, a two-step reaction that results in the formation of phosphoribosylamine from PRPP and glutamine. The first step of this reaction is catalyzed by the N-terminal glutaminase domain while the second step is catalyzed by the C-terminal PRTase domain.