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Phosphoribosyl pyrophosphate (PRPP) is a pentose phosphate. It is a biochemical intermediate in the formation of purine nucleotides via inosine-5-monophosphate , as well as in pyrimidine nucleotide formation.
PyMol rendering of phosphoribosyl pyrophosphate synthetase I (human) as a homodimer, formed by two subunits (red and blue). Three homodimers form the active enzyme complex. Crystallization and X-ray diffraction studies elucidated the structure of the enzyme, which was isolated by cloning, protein expression, and purification techniques.
The enzyme phosphoribosyl pyrophosphate synthetase (PRS) catalyzes the formation of phosphoribosyl pyrophosphate which is a substrate for synthesis of purine and pyrimidine nucleotides, histidine, tryptophan and NAD. PRS exists as a complex with two catalytic subunits and two associated subunits.
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Activation of ribose 5-phosphate to phosphoribosyl pyrophosphate by ribose-phosphate diphosphokinase. PRPP also plays an important role in pyrimidine ribonucleotide synthesis. During the fifth step of pyrimidine nucleotide synthesis, PRPP covalently links to orotate at the one-position carbon on the ribose unit.
It catalyzes the formation of orotidine 5'-monophosphate (OMP) from orotate and phosphoribosyl pyrophosphate. [1] In yeast and bacteria , orotate phosphoribosyltransferase is an independent enzyme with a unique gene coding for the protein, whereas in mammals and other multicellular organisms , the catalytic function is carried out by a domain ...
In enzymology, an anthranilate phosphoribosyltransferase (EC 2.4.2.18) is an enzyme that catalyzes the chemical reaction. anthranilate + phosphoribosyl pyrophosphate N-(5-phosphoribosyl)-anthranilate + diphosphate
231327 Ensembl ENSG00000128059 ENSMUSG00000029246 UniProt Q06203 Q8CIH9 RefSeq (mRNA) NM_002703 NM_172146 RefSeq (protein) NP_002694 NP_742158 Location (UCSC) Chr 4: 56.39 – 56.44 Mb Chr 5: 77.06 – 77.1 Mb PubMed search Wikidata View/Edit Human View/Edit Mouse Amidophosphoribosyltransferase (ATase), also known as glutamine phosphoribosylpyrophosphate amidotransferase (GPAT), is an enzyme ...