phosphoribosyltransferase


Also found in: Acronyms.

phos·pho·ri·bo·syl·trans·fer·ase

(fos'fō-rī'bō-sil-trans'fĕr-ās),
One of a group of enzymes (EC 2.4.2.x, pentosyltransferases) that transfers d-ribose 5-phosphate from 5-phospho-α-d-ribosyl pyrophosphate to a purine, pyrimidine, or pyridine acceptor, forming a 5'-nucleotide and pyrophosphate, or d-ribose from d-ribosyl phosphate to a base, forming a nucleoside, or similar pentose transfers; important in nucleotide biosynthesis. Specific phosphoribosyltransferases are preceded by the name of the acceptor base, for example, uracil phosphoribosyltransferase (that is, uracil + PRPP ⇋ UMP + pyrophosphate).

phosphoribosyltransferase

(fŏs″fō-rī″bō-sĭl-trăns′fĕr-ās)
An enzyme that catalyzes reconversion to the ribonucleotide stage of the purine bases, hypoxanthine and guanine. The deficiency of this enzyme is inherited as an X-linked trait.
References in periodicals archive ?
Other proteins involved include liver kinase B1 (LKB1), which activates AMPK; nicotinamide phosphoribosyltransferase (NAMPT), which facilitates SIRT1 activation through [NAD.sup.+] synthesis; and nuclear respiratory factors 1 and 2 (NRF-1 and NRF-2) and mitochondrial transcription factor A (TFAM), which promote mitochondrial biogenesis.
The inherited rare kidney stone disorders studied by the RKSC include cystinuria, primary hyperoxaluria, adenine phosphoribosyltransferase (APRT) deficiency, and Dent disease (see Table 1).
(2010) The relationship of visfatin/pre-B-cell colony-enhancing factor/nicotinamide phosphoribosyltransferase in adipose tissue with inflammation, insulin resistance, and plasma lipids.
Hypoxanthine guanine phosphoribosyltransferase (HPRT), glyceraldehyde-3-phosphate dehydrogenase (GAPDH) were used as housekeeping gene and data were normalized relative to the expression level of the HPRT gene.
Finally, in the area of transplantation, mycophenolic acid is contraindicated in patients with hereditary deficiency of hypoxanthineguanine phosphoribosyltransferase, as use of mycophenolate in such patients may cause exacerbation of disease symptoms.
Nicotinamide phosphoribosyltransferase (NAMPT) is the rate-limiting enzyme for biosynthesis of nicotinamide adenine dinucleotide (NAD+) [1].
NAD: nicotinamide dinucleotide; NMN: nicotinamide mononucleotide; Nmnat: nicotinamide mononucleotide adenylyltransferase; Nampt: nicotinamide phosphoribosyltransferase. Main Cellular enzymatic Sirtuin compartment action Sirti Nucleus Deacetylase * cytoplasm Sirt2 Cytoplasm Deacetylase * nucleus during mitosis Sirt3 Mitochondria Deacetylase * Sirt4 Mitochondria ADP-ribosyltransferase Demalonylase Lipoamidase Sirt5 Mitochondria Desuccinylase Demalonylase Deglutarylase Sirt6 Nucleus ADP-ribosyltransferase Deacetylase * Sirt7 Nucleolus Deacetylase *
Yndestad et al., "Intracellular nicotinamide phosphoribosyltransferase protects against hepatocyte apoptosis and is down-regulated in nonalcoholic fatty liver disease," Journal of Clinical Endocrinology and Metabolism, vol.
The etiology of preeclampsia is unidentified but it is commonly inferred that pathogenesis of PE is catalysed by adipokines.2 Human nicotinamide phosphoribosyltransferase (Nampt) is an enzyme that is determined by pre-b cell colony enhancing factor-1 (PBEF1) gene.
Pre Bcell colony enhancing factor, whose expression is up regulated in activated lymphocytes, is a nicotinamide phosphoribosyltransferase, a cytosolic enzyme involved in NAD biosynthesis.
The deacetylase activity of SIRT1 largely depends on nicotinamide adenine dinucleotide (NAD+) and nicotinamide phosphoribosyltransferase (NAMPT) is the rate limiting enzyme in the biosynthesis of NAD+ (Preyat and Leo 2013).