title: Characterization of nucleosidediphosphate (NDP)-kinase-associated GTP binding proteins from human recombinant interleukin 2 (rIL-2)-treated mouse NK cells.
abstract: Nucleosidediphosphate (NDP)-kinase-associated proteins from rIL-2-treated mouse NK cells have been biochemically characterized. The associated proteins could be separated from partially purified NDP-kinases by the 5-25% glycerol density gradient centrifugation method after treatment with 6 M urea in the presence of 1 mM EDTA. The associated proteins (approx. Mr 20,000) were defined as GTP binding proteins, since only [alpha-32P]GTP was bound to these proteins in the presence of 5 mM Mg2+ at 37 degrees C. We also found that these GTP binding proteins hydrolyzed only GTP in the presence of 5 mM Mg2+. The data presented here for: GTP specific binding activity; GTPase activity; and molecular size (approx. Mr 20,000) of the NDP-kinase-associated GTP binding proteins are similar to those reported for ras oncogene products (p21 proteins).
mesh_terms: D000818:Animals; D004790:Enzyme Induction; D019204:GTP-Binding Proteins / Q000096:biosynthesis* / Q000302:isolation & purification; D006160:Guanosine Triphosphate / Q000378:metabolism; D006801:Humans; D007376:Interleukin-2 / Q000276:immunology*; D007694:Killer Cells, Natural / Q000276:immunology / Q000378:metabolism*; D007700:Kinetics; D051379:Mice; D008813:Mice, Inbred ICR; D009701:Nucleoside-Diphosphate Kinase / Q000096:biosynthesis* / Q000302:isolation & purification; D010761:Phosphorus Radioisotopes; D010770:Phosphotransferases / Q000096:biosynthesis*; D011994:Recombinant Proteins / Q000276:immunology*
chemical_list: D007376:Interleukin-2; D010761:Phosphorus Radioisotopes; D011994:Recombinant Proteins; D006160:Guanosine Triphosphate; D010770:Phosphotransferases; D009701:Nucleoside-Diphosphate Kinase; D019204:GTP-Binding Proteins