This image illustrates the chemical structure of a purine molecule, highlighting the numbering of the carbon and nitrogen atoms. The purine structure consists of a pyrimidine ring (positions 1 to 6) ...
De novo purine biosynthesis begins with the conversion of phosphoribosyl pyrophosphate (PRPP) to phosphoribosylamine, a reaction catalysed by glutamine phosphoribosylpyrophosphate amidotransferase ...
Purine nucleoside phosphorylase (PNP, E.C. 2.4.2.1) is the enzyme involved in the metabolism of purine bases, nucleosides and nucleotides. It is one of the key proteins in the so-called purine salvage ...
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