title: Enzymes of purine nucleotide metabolism in human lymphocytes.
abstract: A methodology is presented for systemic analysis of purine enzymes in small lymphocyte subfractions. For the determination of 7 different enzymes of purine metabolism *hypoxanthine-guanine phosphoribosyltransferase (HG-PRT), adenine phosphoribosyltransferase (A-PRT), adenosine deaminase (ADA), purine nucleoside phosphorylase (PNP), adenosine kinase (AK), 5'-nucleotidase (5'N), and AMP-deaminase) less than 200,000 peripheral blood lymphocytes are needed. 1000-6000 lyophilised lymphocytes are incubated in micro-incubation vessels (3 microliter) with radioactive substrates for 15-180 min. Separation of substrates and products is achieved by thin-layer chromatography on PEI-cellulose. Addition of BSA to the incubation mixtures results in higher specific enzyme activities and narrower ranges of mean values of a control group.
mesh_terms: D000659:AMP Deaminase / Q000378:metabolism; D000228:Adenine Phosphoribosyltransferase / Q000378:metabolism; D000243:Adenosine Deaminase / Q000378:metabolism; D000248:Adenosine Kinase / Q000378:metabolism; D001402:B-Lymphocytes / Q000201:enzymology*; D002855:Chromatography, Thin Layer / Q000379:methods*; D006801:Humans; D007041:Hypoxanthine Phosphoribosyltransferase / Q000378:metabolism; D009708:Nucleotidases / Q000378:metabolism; D011683:Purine-Nucleoside Phosphorylase / Q000378:metabolism; D011687:Purines; D013601:T-Lymphocytes / Q000201:enzymology*
chemical_list: D011687:Purines; D011683:Purine-Nucleoside Phosphorylase; D000228:Adenine Phosphoribosyltransferase; D007041:Hypoxanthine Phosphoribosyltransferase; D000248:Adenosine Kinase; D009708:Nucleotidases; D000243:Adenosine Deaminase; D000659:AMP Deaminase