PURIFICATION AND PARTIAL CHARACTERIZATION OF DIFFERENT FORMS OF PHOSPHOFRUCTOKINASE IN MAN

Phosphofructokinase (ATP:D-fructose-6-phosphate 1-phosphotransferase, EC 2.7.1.11) from human muscle, brain, heart and granulocytes was purified using a 2 or 3 step purification procedure. The main step is Blue Dextran-Sepharose 4B chromatography with selective elution of phosphofructokinase by formation of the ternary complex ADP or ATP-fructose-6-P-enzyme. Muscle and heart contain only enzyme subunits with a MW of 85,000. This type of subunit is predominant in brain, where it co-exists with subunits of about 80,000 daltons. A single type of subunits is found in the granulocytes, with a MW of 80,000. Anti-muscle phosphofructokinase antiserum reacts only with M-type enzyme. Anti-granulocyte enzyme antiserum, absorbed by pure brain phosphofructokinase exhibits a narrow specificity against the so-called L-type enzyme. Anti-brain antiserum, absorbed by pure muscle phosphofructokinase and partly purified red cell enzyme, exhibits a narrow specificity against a phosphofructokinase from form predominant in fibroblasts and present in brain (F-type).