Hypoxanthine-guanine phosphoribosyltransferase

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Ribbon diagram of a human HPRT tetramer. Magnesium ions visible in green. From PDB 1BZY.
hypoxanthine phosphoribosyltransferase 1
Identifiers
Symbol HPRT1 HPRT
HUGO 5157
Entrez 3251
OMIM 308000
RefSeq NM_000194
UniProt P00492
Other data
EC number 2.4.2.8
Locus Chr. X q26.1

Hypoxanthine-guanine phosphoribosyltransferase (HPRT) is an enzyme in purine metabolism. It converts hypoxanthine to inosine monophosphate,and in some species, guanine to guanine monophosphate (often renamed as HGPRT). Certain HPRTs can also convert xanthine to xanthine monophosphate.

The enzyme primarily functions to salvage purines from degraded DNA to renewed purine synthesis. In this role, it acts as a catalyst in the reaction between guanine and phosphoribosyl pyrophosphate (PRPP) to form GMP.

[edit] Role in disease

Mutations in the gene lead to hyperuricemia:

  • Lesch-Nyhan syndrome is due to HPRT mutations.
  • Some mutations have been linked to gout, the risk of which is increased in hyperuricemia.

[edit] External link

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