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M1567 Sigma-Aldrich

Malic Dehydrogenase from porcine heart

≥600 units/mg protein (biuret), ammonium sulfate suspension

Synonym: L-Malate: NAD+ oxidoreductase, MDH, Malate Dehydrogenase



Related Categories 1.1.x.x Acting on hydroxyl groups, 1.x.x.x Oxidoreductases, Biochemicals and Reagents, Enzyme Class Index, Enzymes, Inhibitors, and Substrates More...
Quality Level   200
form   ammonium sulfate suspension
foreign activity   Glutamic-Oxalacetic Transaminase ≤0.01%
  Glutamic-Pyruvic Transaminase ≤0.01%
storage temp.   2-8°C


General description

Malic Dehydrogenase is a ubiquitous enzyme, which exists in two isoforms in eukaryotic cells.

Malic dehydrogenase exists as a dimer with each subunit containing an NAD-binding domain and a substrate-binding carboxy-terminal domain required for activity.


Malic Dehydrogenase from porcine heart has been used:
• in qualitative protein binding measurements
• to test internally calibrated electrochemical continuous enzyme assay (ICECEA) with model enzyme pair
• to investigate the effect of chaperone on the refolding of heat-denatured malate dehydrogenase

Malic dehydrogenase has been used in a study to assess the effect of an immunomodulator S2 complex on the enzymes of the parasites. It has also been used in a study to investigate the heterogeneity of lactic and malic dehydrogenase in cerebrospinal fluid.

Biochem/physiol Actions

Malic Dehydrogenase (MDH) plays an important role in the citric acid cycle in mitochondria. It catalyzes the interconversion of substrates malate and oxaloacetate with the simultaneous oxidation/reduction of NAD/NADH+. MDH present in the cytosol is involved in the shuttling of malate/aspartate.

Unit Definition

One unit will convert 1.0 μmole of oxalacetate and β-NADH to L-malate and β-NAD per min at pH 7.5 at 25°C.

Physical form

Suspension in 2.8 M (NH4)2SO4 solution, pH 6.0

Safety & Documentation

Safety Information

Personal Protective Equipment 
NONH for all modes of transport
WGK Germany 
Flash Point(F) 
Not applicable
Flash Point(C) 
Not applicable


Certificate of Analysis (COA)

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Certificate of Origin (COO)

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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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