7,8-dihydro-6-hydroxymethylpterin-pyrophosphokinase (HPPK). Folate derivatives are essential cofactors in the biosynthesis of purines, pyrimidines, and amino acids as well as formyl-tRNA. Mammalian cells are able to utilize pre-formed folates after uptake by a carrier-mediated active transport system. Most microbes and plants lack this system and must synthesize folates de novo from guanosine triphosphate. One enzyme from this pathway is HPPK which catalyzes pyrophosphoryl transfer from ATP to 6-hydroxymethyl-7,8-dihydropterin (HP). The functional enzyme is a monomer. Mammals lack many of the enzymes in the folate pathway including, HPPK.
Jiyao W et al.(2023). "The conserved domain database in 2023.",