This family includes a range of diverse phosphoribosyl transferase enzymes. This family includes: Adenine phosphoribosyl-transferase EC:2.4.2.7, Swiss:P07672. Hypoxanthine-guanine-xanthine phosphoribosyl-transferase Swiss:P51900. Hypoxanthine phosph ...
This family includes a range of diverse phosphoribosyl transferase enzymes. This family includes: Adenine phosphoribosyl-transferase EC:2.4.2.7, Swiss:P07672. Hypoxanthine-guanine-xanthine phosphoribosyl-transferase Swiss:P51900. Hypoxanthine phosphoribosyl-transferase EC:2.4.2.8 Swiss:P36766. Ribose-phosphate pyrophosphokinase i EC:2.7.6.1 Swiss:P09329. Amidophosphoribosyltransferase EC:2.4.2.14 Swiss:P00496. Orotate phosphoribosyl-transferase EC:2.4.2.10 Swiss:P11172. Uracil phosphoribosyl-transferase EC:2.4.2.9 Swiss:P25532. Xanthine-guanine phosphoribosyl-transferase EC:2.4.2.22 Swiss:P00501. In Arabidopsis, At the very N-terminus of this domain is the P-Loop NTPase domain [1].
Adenine phosphoribosyltransferase (APRTase) catalyses the reversible Mg2+ dependent reaction of adenine with 5-phospho-alpha-D-ribosyl-1-pyrophosphate (PRPP) to produce AMP and pyrophosphate. This reaction is important in adenine salvage and recycling, and the enzyme is present in species ranging from bacteria to mammals. In humans, APRTase has the sole metabolic function of recycling adenine formed in the polyamine pathway, and the effects of APRTase deficiency are relatively mild. Some protozoan parasite, including Giardia lamblia, are deficient in de novo purine synthesis and so purine uptake from the host and the APRTase reaction are especially important in these organisms.