JBC, Vol. 251, Issue 8, 2255-2257, Apr, 1976
Glucose-6-phosphate dehydrogenase. Purification and partial characterization
M. I. Kanji, M. L. Toews and W. R. Carper
Glucose-6-phosphate dehydrogenase has been purified 1000-fold from pig
liver. This enzyme exists as an active dimer of molecular weight 133,000
and an inactive monomer of molecular weight 67,500. The pH of maximum
activity is 8.5 and the ionic strength maximum is 0.1 to 0.5 M.
Glucose-6-phosphate dehydrogenase is highly specific for NADP+ and glucose
6-phosphate. Apparent Km values of 3.6 muM and 5.4 muM were obtained for
glucose 6-phosphate and NADP+. This enzyme is located almost entirely
within the soluble portion of the cellular cytoplasm.