Analysis of phosphofructokinase subunits and isozymes in ascites tumor cells and its original tissue, murine mammary gland.
Phosphofructokinase (PFK) subunits and isozymes have been examined in ascites tumor cells and murine mammary gland, the tissue from where this tumor originated. Ascites tumor was found to contain predominantly the C-type subunit, whereas the L-type subunit was more abundant in mammary gland. An altered M-type subunit of lower electrophoretic mobility was found in both cell types and no M4 homotetramers were detected in either of them. Characteristic regulatory properties of ascites tumor PFK, i.e. insensitivity to fructose-1,6-P2 activation and inhibition by P-enolpyruvate, were also observed in the mammary gland isozyme. The nature of these properties and the contribution of the distinct subunit types to fructose-1,6-P2 activation are discussed.
Sánchez-Martínez
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Departamento de Bioquímica de la UAM, Instituto de Investigaciones Biomédicas del CSIC, Facultad de Medicina, Universidad Autónoma de Madrid, Spain.
Aragón
J J
JJ
D000818:Animals; D002286:Carcinoma, Ehrlich Tumor / Q000737:chemistry / Q000201:enzymology*; D004789:Enzyme Activation / Q000187:drug effects; D005635:Fructosediphosphates / Q000494:pharmacology; D007527:Isoenzymes / Q000737:chemistry* / Q000187:drug effects; D008297:Male; D008321:Mammary Glands, Animal / Q000166:cytology / Q000187:drug effects / Q000201:enzymology*; D051379:Mice; D010728:Phosphoenolpyruvate / Q000494:pharmacology; D010732:Phosphofructokinase-1 / Q000737:chemistry* / Q000187:drug effects; D051381:Rats; D017207:Rats, Sprague-Dawley
D005635:Fructosediphosphates; D007527:Isoenzymes; D010728:Phosphoenolpyruvate; D010732:Phosphofructokinase-1