1. Recycling of alpha-D-ribose 1-phosphate for nucleoside interconversion.
- Author
-
Giorgelli F, Bottai C, Mascia L, Scolozzi C, Camici M, and Ipata PL
- Subjects
- Animals, Guanine Deaminase metabolism, Guanosine metabolism, Pyrimidine Nucleotides biosynthesis, Rats, Ribonucleosides metabolism, Ribose metabolism, Substrate Cycling, Tissue Extracts metabolism, Uracil Nucleotides metabolism, Xanthines, Purine Nucleosides metabolism, Purine-Nucleoside Phosphorylase metabolism, Ribosemonophosphates metabolism
- Abstract
Mobilization of the ribose moiety and of the amino group of guanosine may be realized in rat liver extract by the concerted action of purine nucleoside phosphorylase and guanase. Ribose 1-phosphate formed from guanosine through the action of purine nucleoside phosphorylase acts as ribose donor in the synthesis of xanthosine catalyzed by the same enzyme. The presence of guanase, which irreversibly converts guanine to xanthine, affects the overall process of guanosine transformation. As a result of this purine pathway, guanosine is converted into xanthosine, thus overcoming the lack of guanosine deaminase in mammals. Furthermore, in rat liver extract the activated ribose moiety stemming from the catabolism of purine nucleosides can be transferred to uracil and, in the presence of ATP, used for the synthesis of pyrimidine nucleotides; therefore, purine nucleosides can act as ribose donors for the salvage of pyrimidine bases.
- Published
- 1997