Occurrence of the purine nucleotide cycle in rat pancreatic islets.
The presence of the purine nucleotide cycle is investigated in rat pancreatic islets. Adenylosuccinase, adenylate deaminase, and adenylosuccinate synthetase activities are characterized in islet homogenates. In the assay of the latter enzyme, evidence is obtained for operation of the full cycle in islet extracts. The activities of the three enzymes are not vastly different in islet and brain. These findings are discussed in the light of the role currently ascribed to the purine nucleotide cycle in producing ammonia from amino acids, in adjusting the concentration of Krebs cycle intermediates, in regulating the relative concentrations of ATP, ADP, and AMP, and in controlling the activity of phosphofructokinase.
Marynissen
G
G
Laboratory of Experimental Medicine, Erasmus Medical School, Brussels Free University, Belgium.
Sener
A
A
Malaisse
W J
WJ
D000659:AMP Deaminase / Q000378:metabolism*; D000264:Adenylosuccinate Lyase / Q000378:metabolism*; D000265:Adenylosuccinate Synthase / Q000378:metabolism*; D000818:Animals; D001921:Brain / Q000201:enzymology; D005260:Female; D007515:Islets of Langerhans / Q000201:enzymology*; D007700:Kinetics; D011685:Purine Nucleotides / Q000378:metabolism*; D051381:Rats; D017208:Rats, Wistar
D011685:Purine Nucleotides; D000659:AMP Deaminase; D000264:Adenylosuccinate Lyase; D000265:Adenylosuccinate Synthase