Malic Enzyme: Evidence for Two Molecular Forms in the Sarcoplasm of Fish Skeletal Muscle

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Abstract
A latent form of malic enzyme activity (latent ME), which appears in the centrifuged tissue fluid of haddock skeletal muscle after the tissue has been frozen and thawed, appears also in the fluid of unfrozen haddock muscle after homogenization. It is more labile to refrigerated storage, ionizing radiation, and heat than is its normally soluble counterpart (free ME), and the two forms have demonstrably different electrophoretic migration rates. Although there is some evidence for catalytically active subunits for both forms, it has not yet been determined whether the latent activity is a true isoenzyme or a subunit of the free form.

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