Phosphoribosyl pyrophosphate

Phosphoribosyl pyrophosphate

Names
Other names 5-phospho-alpha-D-ribose 1-diphosphate
Identifiers
CAS Number	7540-64-9 N
3D model (JSmol)	Interactive image
ChEBI	CHEBI:17111 Y
ChemSpider	7062 Y
DrugBank	DB01632 Y
MeSH	Phosphoribosyl+pyrophosphate
PubChem CID	7339
InChI InChI=1S/C5H13O14P3/c6-3-2(1-16-20(8,9)10)17-5(4(3)7)18-22(14,15)19-21(11,12)13/h2-7H,1H2,(H,14,15)(H2,8,9,10)(H2,11,12,13)/t2-,3-,4-,5-/m1/s1 Y Key: PQGCEDQWHSBAJP-TXICZTDVSA-N Y InChI=1/C5H13O14P3/c6-3-2(1-16-20(8,9)10)17-5(4(3)7)18-22(14,15)19-21(11,12)13/h2-7H,1H2,(H,14,15)(H2,8,9,10)(H2,11,12,13)/t2-,3-,4-,5-/m1/s1 Key: PQGCEDQWHSBAJP-TXICZTDVBW
SMILES O=P(O[C@H]1O[C@@H]([C@@H](O)[C@H]1O)COP(=O)(O)O)(O)OP(=O)(O)O
Properties
Chemical formula	C5H13O14P3
Molar mass	390.07 g/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Phosphoribosyl pyrophosphate (PRPP) is a pentosephosphate.

It is formed from ribose 5-phosphate by the enzyme ribose-phosphate diphosphokinase.

It plays a role in transferring phospho-ribose groups in several reactions:

In de novo generation of purines, the enzyme amidophosphoribosyltransferase acts upon PRPP to create phosphoribosylamine.

Increased PRPP

Increased levels of PRPP is characterized by the overproduction and accumulation of uric acid leading to hyperuricemia and hyperuricosuria. It is one of the causes of gout.

Increased levels of PRPP are present in Lesch-Nyhan Syndrome. Decreased levels of hypoxanthine guanine phosphoribosyl transferase (HGPRT) causes this accumulation, as PRPP is a substrate used by HGPRT during purine salvage.

See also

• Pyrimidine biosynthesis