Biomaterial Database

Regulation of de novo purine biosynthesis in normal and 8-azaguanine-resistant Chinese hamster cells. 1978

M W Taylor, and M K Tokito, and K C Gupta, and J Pipkorn

Azaguanine-resistant mutants of Chinese hamster ovary cells were isolated following mutagenesis with ICR-17OG. Of the eight mutant isolates examined, only one, Ag-5 had detectable hypoxanthine(guanine)phosphoribosyltransferase activity. Under normal conditions of growth, de novo purine biosynthesis in the mutants was not significantly different from wild type. However, when the cultures were starved for glutamine over a 2 h period before measuring 5'phosphoribosyl formylglycinamide (a relative measure of de novo purine biosynthesis), elevated levels of 5'-phosphoribosyl formylglycinamide accumulated in some of the mutants, and decreased levels in wild type and Ag-5. The level of purine biosynthesis could be related to the levels of glutamine in the pregrowth medium. The rate of purine biosynthesis correlated with 5-phosphoribosyl pyrophosphate levels, which were enhanced in the mutant (Ag-C) following the starvation period. No alterations were found in levels of 5-phosphoribosyl pyrophosphate synthetase or glutamine synthetase. The extent of feedback inhibition was normal in both mutant and wild type cells. These data suggest that the hypoxanthine (guanine) phosphoribosyltransferase locus is a regulatory gene.

UI	MeSH Term	Description	Entries
D007041	Hypoxanthine Phosphoribosyltransferase	An enzyme that catalyzes the conversion of 5-phosphoribosyl-1-pyrophosphate and hypoxanthine, guanine, or MERCAPTOPURINE to the corresponding 5'-mononucleotides and pyrophosphate. The enzyme is important in purine biosynthesis as well as central nervous system functions. Complete lack of enzyme activity is associated with the LESCH-NYHAN SYNDROME, while partial deficiency results in overproduction of uric acid. EC 2.4.2.8.	Guanine Phosphoribosyltransferase,HPRT,Hypoxanthine-Guanine Phosphoribosyltransferase,IMP Pyrophosphorylase,HGPRT,HPRTase,Hypoxanthine Guanine Phosphoribosyltransferase,Phosphoribosyltransferase, Guanine,Phosphoribosyltransferase, Hypoxanthine,Phosphoribosyltransferase, Hypoxanthine-Guanine,Pyrophosphorylase, IMP
D007926	Lesch-Nyhan Syndrome	An inherited disorder transmitted as a sex-linked trait and caused by a deficiency of an enzyme of purine metabolism; HYPOXANTHINE PHOSPHORIBOSYLTRANSFERASE. Affected individuals are normal in the first year of life and then develop psychomotor retardation, extrapyramidal movement disorders, progressive spasticity, and seizures. Self-destructive behaviors such as biting of fingers and lips are seen frequently. Intellectual impairment may also occur but is typically not severe. Elevation of uric acid in the serum leads to the development of renal calculi and gouty arthritis. (Menkes, Textbook of Child Neurology, 5th ed, pp127)	Choreoathetosis Self-Mutilation Hyperuricemia Syndrome,Hypoxanthine-Phosphoribosyl-Transferase Deficiency Disease,Choreoathetosis Self-Mutilation Syndrome,Complete HGPRT Deficiency Disease,Complete HPRT Deficiency,Complete Hypoxanthine-Guanine Phosphoribosyltransferase Deficiency,Deficiency Disease, Complete HGPRT,Deficiency Disease, Hypoxanthine-Phosphoribosyl-Transferase,Deficiency of Guanine Phosphoribosyltransferase,Deficiency of Hypoxanthine Phosphoribosyltransferase,HGPRT Deficiency,HGPRT Deficiency Disease, Complete,Hypoxanthine Guanine Phosphoribosyltransferase 1 Deficiency,Hypoxanthine Guanine Phosphoribosyltransferase Deficiency,Hypoxanthine Phosphoribosyltransferase Deficiency,Juvenile Gout, Choreoathetosis, Mental Retardation Syndrome,Juvenile Hyperuricemia Syndrome,Lesch-Nyhan Disease,Primary Hyperuricemia Syndrome,Total HPRT Deficiency,Total Hypoxanthine-Guanine Phosphoribosyl Transferase Deficiency,X-Linked Hyperuricemia,X-Linked Primary Hyperuricemia,Choreoathetosis Self Mutilation Hyperuricemia Syndrome,Choreoathetosis Self Mutilation Syndrome,Choreoathetosis Self-Mutilation Syndromes,Complete HPRT Deficiencies,Complete Hypoxanthine Guanine Phosphoribosyltransferase Deficiency,Deficiencies, Complete HPRT,Deficiencies, HGPRT,Deficiencies, Hypoxanthine Phosphoribosyltransferase,Deficiencies, Total HPRT,Deficiency Disease, Hypoxanthine Phosphoribosyl Transferase,Deficiency Diseases, Hypoxanthine-Phosphoribosyl-Transferase,Deficiency, Complete HPRT,Deficiency, HGPRT,Deficiency, Hypoxanthine Phosphoribosyltransferase,Deficiency, Total HPRT,Guanine Phosphoribosyltransferase Deficiencies,Guanine Phosphoribosyltransferase Deficiency,HGPRT Deficiencies,HPRT Deficiencies, Complete,HPRT Deficiencies, Total,HPRT Deficiency, Complete,HPRT Deficiency, Total,Hyperuricemia Syndrome, Juvenile,Hyperuricemia Syndrome, Primary,Hyperuricemia Syndromes, Juvenile,Hyperuricemia Syndromes, Primary,Hyperuricemia, X-Linked,Hyperuricemia, X-Linked Primary,Hyperuricemias, X-Linked,Hyperuricemias, X-Linked Primary,Hypoxanthine Phosphoribosyl Transferase Deficiency Disease,Hypoxanthine Phosphoribosyltransferase Deficiencies,Hypoxanthine-Phosphoribosyl-Transferase Deficiency Diseases,Juvenile Hyperuricemia Syndromes,Lesch Nyhan Disease,Lesch Nyhan Syndrome,Phosphoribosyltransferase Deficiencies, Guanine,Phosphoribosyltransferase Deficiencies, Hypoxanthine,Phosphoribosyltransferase Deficiency, Guanine,Phosphoribosyltransferase Deficiency, Hypoxanthine,Primary Hyperuricemia Syndromes,Primary Hyperuricemia, X-Linked,Primary Hyperuricemias, X-Linked,Self-Mutilation Syndrome, Choreoathetosis,Self-Mutilation Syndromes, Choreoathetosis,Syndrome, Choreoathetosis Self-Mutilation,Syndrome, Juvenile Hyperuricemia,Syndrome, Primary Hyperuricemia,Syndromes, Choreoathetosis Self-Mutilation,Syndromes, Juvenile Hyperuricemia,Syndromes, Primary Hyperuricemia,Total HPRT Deficiencies,Total Hypoxanthine Guanine Phosphoribosyl Transferase Deficiency,X Linked Hyperuricemia,X Linked Primary Hyperuricemia,X-Linked Hyperuricemias,X-Linked Primary Hyperuricemias
D010754	Phosphoribosyl Pyrophosphate	The key substance in the biosynthesis of histidine, tryptophan, and purine and pyrimidine nucleotides.	Pyrophosphate, Phosphoribosyl
D011687	Purines	A series of heterocyclic compounds that are variously substituted in nature and are known also as purine bases. They include ADENINE and GUANINE, constituents of nucleic acids, as well as many alkaloids such as CAFFEINE and THEOPHYLLINE. Uric acid is the metabolic end product of purine metabolism.
D002460	Cell Line	Established cell cultures that have the potential to propagate indefinitely.	Cell Lines,Line, Cell,Lines, Cell
D005246	Feedback	A mechanism of communication within a system in that the input signal generates an output response which returns to influence the continued activity or productivity of that system.	Feedbacks
D005973	Glutamine	A non-essential amino acid present abundantly throughout the body and is involved in many metabolic processes. It is synthesized from GLUTAMIC ACID and AMMONIA. It is the principal carrier of NITROGEN in the body and is an important energy source for many cells.	D-Glutamine,L-Glutamine,D Glutamine,L Glutamine
D005998	Glycine	A non-essential amino acid. It is found primarily in gelatin and silk fibroin and used therapeutically as a nutrient. It is also a fast inhibitory neurotransmitter.	Aminoacetic Acid,Glycine, Monopotassium Salt,Glycine Carbonate (1:1), Monosodium Salt,Glycine Carbonate (2:1), Monolithium Salt,Glycine Carbonate (2:1), Monopotassium Salt,Glycine Carbonate (2:1), Monosodium Salt,Glycine Hydrochloride,Glycine Hydrochloride (2:1),Glycine Phosphate,Glycine Phosphate (1:1),Glycine Sulfate (3:1),Glycine, Calcium Salt,Glycine, Calcium Salt (2:1),Glycine, Cobalt Salt,Glycine, Copper Salt,Glycine, Monoammonium Salt,Glycine, Monosodium Salt,Glycine, Sodium Hydrogen Carbonate,Acid, Aminoacetic,Calcium Salt Glycine,Cobalt Salt Glycine,Copper Salt Glycine,Hydrochloride, Glycine,Monoammonium Salt Glycine,Monopotassium Salt Glycine,Monosodium Salt Glycine,Phosphate, Glycine,Salt Glycine, Monoammonium,Salt Glycine, Monopotassium,Salt Glycine, Monosodium
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D001375	Azaguanine	One of the early purine analogs showing antineoplastic activity. It functions as an antimetabolite and is easily incorporated into ribonucleic acids.	Guanazolo,8-Azaguanine,8 Azaguanine