PMID: 6166862Jul 1, 1981Paper

Purine metabolism in Trypanosoma cruzi

Molecular and Biochemical Parasitology
R L BerensD J Nelson

Abstract

Culture forms of Trypanosoma cruzi are incapable of synthesizing purines de novo from formate, glycine, or serine and require an exogenous purine for growth. Adenine, hypoxanthine, guanine, xanthine and their respective ribonucleosides are equal in their abilities to support growth. Radiolabeled purine bases, with the exception of guanine, are stable and are converted to their respective ribonucleotides directly by phosphoribosyltransferase activity. Guanine is both converted to its ribonucleotide and deaminated to xanthine. Purine nucleosides are not hydrolysed to any extent but are converted to their respective ribonucleotides. This conversion may involve a rete-limiting ribonucleoside cleaving activity or a purine nucleoside kinase or phosphotransferase activity. The apparent order of salvage efficiency for the bases and their respective ribonucleosides is adenine greater than hypoxanthine greater than guanine greater than xanthine.

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