Glyceraldehyde-3-phosphate dehydrogenase from Ehrlich ascites carcinoma cells its possible role in the high glycolysis of malignant cells.
Glyceraldehyde-3-phosphate dehydrogenase has been purified to apparent homogeneity from Ehrlich ascites carcinoma (EAC) cells. The enzyme is quite active over a pH range of 7.5-9.0 with an optimum pH of 8.4-8.7. The specific activity of the enzyme is much higher than that from other normal sources. In contrast to enzyme obtained from rabbit muscle, the EAC cell enzyme is not significantly inhibited by physiological concentrations of ATP at physiological pH. Kinetic studies using different substrates and inhibitors indicate that the properties of the EAC cell enzyme are significantly different from those of glyceraldehyde-3-phosphate dehydrogenase obtained from other normal sources. The striking dissimilarity of the malignant cell glyceraldehyde-3-phosphate dehydrogenase compared with this enzyme from other normal sources, particularly in respect to the interaction with ATP, may in part explain the high glycolysis of malignant cells.
Bagui
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S
Department of Biological Chemistry, Indian Association for the Cultivation of Science, Calcutta, India.
Ray
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Ray
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D000255:Adenosine Triphosphate / Q000494:pharmacology; D000818:Animals; D002286:Carcinoma, Ehrlich Tumor / Q000201:enzymology* / Q000473:pathology; D002852:Chromatography, Ion Exchange; D004591:Electrophoresis, Polyacrylamide Gel; D004791:Enzyme Inhibitors / Q000494:pharmacology; D004795:Enzyme Stability; D005987:Glyceraldehyde-3-Phosphate Dehydrogenases / Q000037:antagonists & inhibitors / Q000302:isolation & purification / Q000378:metabolism*; D006019:Glycolysis; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008970:Molecular Weight; D009243:NAD / Q000494:pharmacology; D009249:NADP / Q000494:pharmacology; D011817:Rabbits; D013379:Substrate Specificity
D004791:Enzyme Inhibitors; D009243:NAD; D009249:NADP; D000255:Adenosine Triphosphate; D005987:Glyceraldehyde-3-Phosphate Dehydrogenases