✍ Scribed by Wang, H. S.; LéJohn, H. B.
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Isocitrate dehydrogenase (IDH) exists in mammalian tissues as three enzymes, one specific for NAD and two specific for NADP. The two NADP isozymes differ in electrophoretic mobility, immunological characteristics, and tissue and subcellular location. One is found mainly in the mitochondrial fraction
Cytoplasmic and mitochondrial isozymes of NADP+-dependent isocitrate dehydrogenase were purified from kidney and heart tissue of an inbred strain of mice. The cytoplasmic isozyme was purified from kidney of DBA/2J mice by means of a four-step procedure which included affinity chromatography with an
The eects of methotrexate (MTX) on oxygen uptake by permeabilized HeLa cells were evaluated. MTX did not inhibit state III respiration when the oxidizable substrate was succinate, but when the substrates were 2-oxoglutarate or isocitrate the respiration decreased about 50 per cent at 1 . 0 mM concen