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M5257 Sigma

Malic Dehydrogenase (oxalacetate-decarboxylating) from chicken liver

ammonium sulfate suspension, 10-30 units/mg protein (modified Warburg-Christian)

Synonym: L-Malate:NADP+ oxidoreductase-(oxalacetate-decarboxylating), Malate Dehydrogenase (oxalacetate-decarboxylating), Malic Enzyme



Unit Definition

One unit will convert 1.0 μmole of L-malate and NADP to pyruvate, CO2, and NADPH per min at pH 7.4 at 25 °C.

Physical form

Suspension in 2.9 M (NH4)2SO4 solution containing 10 mM potassium phosphate, 0.5 mM 2-mercaptoethanol, 10 mM manganese chloride, and 3 mM Na4EDTA, pH 6.0


Malic dehydrogenase has been used in a study to assess the dietary manganese requirement of juvenile yellow catfish (Pelteobagrus fulvidraco) and effects on whole body mineral composition and hepatic intermediary metabolism. It has also been used in a study to investigate the establishment and biological characterization of a fibroblast cell line from the Langshan chicken.

Biochem/physiol Actions

Expression of malic dehydrogenase in chicken liver is induced upon feeding and decreases in response to starvation.

General description

Malic dehydrogenase (MDH) exists as two isoforms within eukaryotic cells, one that is expressed in the mitochondria and functions in the TCA cycle and one in the cytoplasm that converts malate from the mitochondria back into oxaloacetate.

Price and Availability

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Biomedical Applications
Safety & Documentation

Safety Information

NONH for all modes of transport
WGK Germany 
Protocols & Articles


Ammonium Sulfate Suspensions - Technical Note

Note that for an ammonium sulfate suspension, most of the enzyme will be in solid form. It is likely that only negligible amounts of enzyme will be in the ammonium sulfate solution.
Keywords: Enzyme activity


Enzymatic Assay of Malic Dehydrogenase (EC

The continuous spectrophotometric rate determination (A340, Light path = 1 cm) is based on the following reaction:
Keywords: Extinction coefficient

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Enzymes & Proteins

Application Index | Enzyme Index | Substrate Index | Inhibitor Index | Cofactor Index | Lectin Index
Keywords: Cell signaling, Diagnostic, Drug discovery, Molecular biology

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