Nucleoside metabolism

Nucleoside metabolism refers to the collection of biochemical processes responsible for the synthesis and breakdown of nucleosides and nucleotides within cells. This includes both anabolic pathways that build nucleotides from simple precursors (de novo synthesis) and salvage pathways that recycle bases and nucleosides into new nucleotides. Key enzymes involved include adenosine kinase, 5'-nucleotidase, deaminases, ribonucleotide reductase, carbamoyl phosphate synthetase II, among others[1][6][7]. These metabolic processes are essential for DNA replication and repair as well as RNA transcription. Disruptions or targeted inhibition of specific steps in these pathways are relevant in cancer therapy—where nucleotide analogues or enzyme inhibitors can block cell proliferation—and in certain inherited metabolic disorders such as Lesch-Nyhan syndrome or adenosine deaminase deficiency[2][5]. However, "nucleoside metabolism" is not a single molecular target but rather a broad pathway involving many distinct enzymes; thus it is not considered a canonical therapeutic target itself but rather a process comprising multiple potential targets. There is something incorrect with this entry as "nucleoside metabolism" does not refer to a single molecule or receptor but instead describes an entire class of metabolic reactions involving numerous proteins and enzymes. For structured data purposes you should specify individual enzyme targets within this pathway such as "ribonucleotide reductase," "thymidylate synthase," or "adenosine kinase"[1][3][6].

Inhibition of nucleotide synthesis enzymes (e.g., ribonucleotide reductase inhibitors, thymidylate synthase inhibitors)