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M9004 Sigma-Aldrich

Malic Dehydrogenase from bovine heart

ammonium sulfate suspension, 2000-4000 units/mg protein (modified Warburg-Christian)

Synonym: L-Malate:NAD+ oxidoreductase, MDH



Related Categories 1.1.x.x Acting on hydroxyl groups, 1.x.x.x Oxidoreductases, Biochemicals and Reagents, Cell Biology, Enzyme Class Index,
Quality Level   200
form   ammonium sulfate suspension
mol wt   35 kDa
impurities   ≤0.01% Glutamic-Oxalacetic Transaminase
  ≤0.01% Glutamic-Pyruvic Transaminase
storage temp.   2-8°C


General description

Malic Dehydrogenase from bovine heart contains a histidine residue at the NAD-binding active site which is critical for activity. When this histidine is mutated a loss in activity is observed.


Malic dehydrogenase has been used in a study to assess a flow injection system for on-line monitoring of fumaric acid in biological processes. It has also been used in a study to investigate a root-knot nematode parasitizing peanut in Texas.

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 3 M (NH4)2SO4 - 0.01 M KH2PO4 solution, pH 7.3

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
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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