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Nucleotide salvage: Wikis

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A salvage pathway is a pathway in which nucleotides (purine and pyrimidine) are synthesized from intermediates in the degradative pathway for nucleotides.

Salvage pathways are used to recover bases and nucleosides that are formed during degradation of RNA and DNA. This is important in some organs because some tissues cannot undergo de novo synthesis.

The salvaged bases and nucleosides can then be converted back into nucleotides.

Contents

Substrates

The salvage pathway requires distinct substrates:

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Pyrimidines

Thymidine requires a substrate whose enzyme is called thymidine kinase Plasmodium falciparum has only salways pathway to form purines since it does not have [de novo] pathway.

Purines

Nucleoside Enzyme Nucleotide
hypoxanthine hypoxanthine/guanine phosphoribosyl transferase (HGPRT) IMP
guanine hypoxanthine/guanine phosphoribosyl transferase (HGPRT) GMP
adenine adenine phosphoribosyltransferase (APRT) AMP

Lesch-Nyhan syndrome is associated with a deficiency of HGPRT.

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