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isocitrate:NAD+ oxidoreductase (decarboxylating)
Requires Mn2+ or Mg2+ for activity. Unlike EC 22.214.171.124, isocitrate dehydrogenase (NADP+), oxalosuccinate cannot be used as a substrate. In eukaryotes, isocitrate dehydrogenase exists in two forms: an NAD+-linked enzyme found only in mitochondria and displaying allosteric properties, and a non-allosteric, NADP+-linked enzyme that is found in both mitochondria and cytoplasm . The enzyme from some species can also use NADP+ but much more slowly .