Purine transporter

Purine transporters are integral membrane proteins that mediate the directed movement of purines and their derivatives across cellular membranes, typically using symport mechanisms powered by ion gradients (often H(+)), as exemplified by the fungal transporter UapA[2][3][6]. They play essential roles in cell survival, nucleic acid biosynthesis, and energy metabolism. The eukaryotic purine/H(+) symporter UapA is formed from two domains—core and gate—organized in a 14 transmembrane segment structure. Dimerization is crucial for its transport activity and correct cellular localization[3][6]. In parasitic organisms, purine nucleotide transporters are vital for supplementing nucleotide biosynthetic deficiencies and supporting replication[7]. Although fundamental for cell biology and pathogen survival, they remain poorly explored as direct drug targets, with no approved medications yet specifically targeting purine transport functions. The term "purine transporter system" is not standard and, for structured data, references should be to individual, molecularly characterized transporter proteins[2][3][5][8].

Other names

purine/H(+) symporternucleobase ascorbate transporter (NAT family)uric acid/xanthine transporterSLC family purine transporters

Competitive inhibition of purine binding; Substrate mimicry by nucleobase analogs; Mutagenesis to alter specificity