Search results
Results From The WOW.Com Content Network
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.
A key regulatory step is the production of 5-phospho-α-D-ribosyl 1-pyrophosphate by ribose-phosphate diphosphokinase, which is activated by inorganic phosphate and inactivated by purine ribonucleotides. It is not the committed step to purine synthesis because PRPP is also used in pyrimidine synthesis and salvage pathways.
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.
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.
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 ...
n/a Ensembl n/a n/a UniProt n a n/a RefSeq (mRNA) n/a n/a RefSeq (protein) n/a n/a Location (UCSC) n/a n/a PubMed search n/a n/a Wikidata View/Edit Human Hypoxanthine-guanine phosphoribosyltransferase (HGPRT) is an enzyme encoded in humans by the HPRT1 gene. HGPRT is a transferase that catalyzes conversion of hypoxanthine to inosine monophosphate and guanine to guanosine monophosphate. This ...
Adenine + Phosphoribosyl Pyrophosphate → Adenylate + Pyrophosphate ARPTase catalyzes a phosphoribosyl transfer from PRPP to adenine, forming AMP and releasing pyrophosphate (PPi). In organisms that can synthesize purines de novo, the nucleotide salvage pathway provides an alternative that is energetically more efficient.
Lipid-rich, collagen fiber-laced blubber comprises the hypodermis [2] and covers the whole body, except for parts of the appendages. It is strongly attached to the musculature and skeleton by highly organized, fan-shaped networks of tendons and ligaments, can comprise up to 50 per cent of the body mass of some marine mammals during some points in their lives, and can range from 5 cm (2 in ...