Formyl-FH4 Hydrolase catalyzes the hydrolysis of 10-formyltetrahydrofolate (formyl-FH4) to FH4 and formate. Formate is the substrate of phosphoribosylglycinamide transformylase for step three of de novo purine nucleotide synthesis. Formyl-FH4 hydrolase has been proposed to regulate the balance of FH4 and C1-FH4 in the cell. The enzyme uses methionine and glycine to sense the pools of C1-FH4 and FH4, respectively. This domain belongs to the formyltransferase (FMT) domain superfamily. Members of this family have an N-terminal ACT domain, which is commonly involved in specifically bind an amino acid or other small ligand leading to regulation of the enzyme. The N-terminal of this protein family may be responsible for the binding of the regulators methionine and glycine.
Jiyao W et al.(2023). "The conserved domain database in 2023.",