Ion-exchange column chromatographic method for assaying purine metabolic pathway enzymes

Herbert Ward, Douglas Baldwin, Tingchung Wang, Huber Warner, Katherine Seymour, Cathleen Marquardt, Edward McFalls, John E. Foker

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

High energy phosphate levels fall rapidly during cardiac ischemia and recover slowly (more than one week) during reperfusion. The slow recovery of ATP may reflect a lack of purine metabolic precursors and/or increased activity of purine catabolic enzymes such as 5'-nucleotidase (5'-NT, EC 3.1.3.5) and adenosine deaminase (ADA, EC 3.5.4.4). The activity of enzymes involved in both the catabolism of ATP precursors (5-NT and ADA) and the restoration of ATP from slow synthetic pathways [adenosine kinase (AK, EC 2.7.1.20), adenine phosphoribosyl transferase (APRT, EC 2.4.2.7) and hypoxanthine phosphoribosyl transferase (HPRT, EC 2.4.2.8)] may directly affect the rate of ATP recovery. Strategies to enhance recovery will depend on the relative activity of these enzymes following ischemia. Their activity in different species and their response to ischemia are not well characterized. Hence, rapid assay methods for these enzymes would facilitate detailed time course studies of their activities in postischemic myocardium. We modified a single ion-exchange column chromatographic method using DEAE- Sephadex to determine the products of incubation of 5'-NT, AK, APRT and HPRT with their respective substrates. The uniformity of the final product measurement procedure for all assays permits the activities of the four enzymes to be rapidly determined in a single tissue sample and facilitates the study of a large number of samples. This technique should also be useful for enzymes of the pyrimidine metabolic pathway.

Original languageEnglish (US)
Pages (from-to)295-300
Number of pages6
JournalJournal of Chromatography B: Biomedical Applications
Volume707
Issue number1-2
DOIs
StatePublished - Apr 10 1998

Keywords

  • 5'-Nucleotidase
  • Adenine phosphoribosyl transferase
  • Adenosine kinase
  • Enzymes
  • Hypoxanthine phosphoribosyl transferase
  • Purine

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