title: High terminal deoxynucleotidyl transferase activity in a new T-cell line (RPMI 8402) of acute lymphoblastic leukemia origin.
abstract: High activity of terminal deoxynucleotidyl transferase (terminal transferase) was found in a new "thymus-dependent" cell line (RPMI 8402) which is of acute lymphoblastic leukemia origin. This enzyme resembled the terminal transferase from other human cells in all its properties including Km (0.7 x 10(-6) m for dGTP). The high activity of this enzyme in RPMI 8402 and fresh acute leukemia lymphoblasts, in contrast to the low activity of this enzyme reported for "thymus-independent' cells, suggested that this cell line may have originated from leukemia cells. Moreover, the high activity of terminal transferase in RPMI 8402 cells should make feasible large-scale purification of this enzyme for detailed studies.
mesh_terms: D002460:Cell Line; D002499:Centrifugation, Density Gradient; D002843:Chromatin / Q000201:enzymology; D002852:Chromatography, Ion Exchange; D004254:DNA Nucleotidyltransferases / Q000037:antagonists & inhibitors / Q000302:isolation & purification / Q000378:metabolism*; D004492:Edetic Acid / Q000494:pharmacology; D005033:Ethylmaleimide / Q000494:pharmacology; D006801:Humans; D007700:Kinetics; D007945:Leukemia, Lymphoid / Q000201:enzymology*; D008214:Lymphocytes / Q000648:ultrastructure; D010710:Phosphates / Q000494:pharmacology; D012965:Sodium Chloride / Q000494:pharmacology; D013329:Structure-Activity Relationship; D013601:T-Lymphocytes / Q000201:enzymology*
chemical_list: D002843:Chromatin; D010710:Phosphates; D012965:Sodium Chloride; D004492:Edetic Acid; D004254:DNA Nucleotidyltransferases; D005033:Ethylmaleimide