title: Characterization of pyruvate kinase from the liver of a patient with aberrant erythrocyte pyruvate kinase, PK Nagasaki.
abstract: The characterization of the L-type PK were made of PK extracted from the liver of a patient with congenital hemolytic anemia associated with an erythrocyte PK variant, PK Nagasaki. The L-type PK of PK Nagasaki showed the following parameters: slow migration on electrophoresis, high Km for PEP without F-1,6-P2, less activation by F-1,6-P2, normal Km for ADP, high utilization of UDP, acidic pH optimum, and instability to urea and heat. These tests served to differentiate this L-type PK variant from the other variants previously reported. At the same time, both the Km for PEP with F-1,6-P2 saturation and the electrophoretic mobility of L-type PK were found to be different from those of the erythrocyte PK and PK Nagasaki. Though the liver cell, with regard to L-type PK, has only the less functional and less stable mutant L-type PK there is no evidence of liver dysfunction or damage, although there is chronic hemolytic anemia.
mesh_terms: D000293:Adolescent; D000328:Adult; D000746:Anemia, Hemolytic, Congenital Nonspherocytic / Q000097:blood / Q000201:enzymology*; D004591:Electrophoresis, Polyacrylamide Gel; D004912:Erythrocytes / Q000201:enzymology*; D005260:Female; D005635:Fructosediphosphates / Q000378:metabolism; D006801:Humans; D066298:In Vitro Techniques; D007527:Isoenzymes / Q000378:metabolism*; D007700:Kinetics; D008099:Liver / Q000201:enzymology*; D008297:Male; D009711:Nucleotides / Q000378:metabolism; D010728:Phosphoenolpyruvate / Q000378:metabolism; D011770:Pyruvate Kinase / Q000378:metabolism*; D013379:Substrate Specificity
chemical_list: D005635:Fructosediphosphates; D007527:Isoenzymes; D009711:Nucleotides; D010728:Phosphoenolpyruvate; D011770:Pyruvate Kinase