Formate-dependent phosphoribosylglycinamide formyltransferase (PurT) is involved in de novo purine biosynthesis. PurT belongs to the ATP-grasp superfamily of enzymes and catalyses the transfer of formate to 5-phospho-ribosyl-glycinamide (GAR), producing 5-phospho-ribosyl-N-formylglycinamide (FGAR) [1,2]. This entry represents the C-terminal domain which has a rudiment single hybrid motif consisting of a sandwich of half-barrel shaped beta-sheets [2].

1: Molecular structure of Escherichia coli PurT-encoded glycinamide ribonucleotide transformylase. Thoden JB, Firestine S, Nixon A, Benkovic SJ, Holden HM; Biochemistry. 2000;39:8791-8802. PMID:10913290

2: PurT-encoded glycinamide ribonucleotide transformylase. Accommodation of adenosine nucleotide analogs within the active site. Thoden JB, Firestine SM, Benkovic SJ, Holden HM; J Biol Chem. 2002;277:23898-23908. PMID:11953435