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L2500 Sigma-Aldrich

L-Lactic Dehydrogenase from rabbit muscle

Type II, ammonium sulfate suspension, 800-1,200 units/mg protein

Synonym: (S)-Lactate: NAD+ oxidoreductase, L-LDH, LAD, LD, Lactate



Related Categories 1.1.x.x Acting on hydroxyl groups, 1.x.x.x Oxidoreductases, Application Index, Biochemicals and Reagents, Cell Biology,
type   Type II
form   ammonium sulfate suspension
foreign activity   pyruvate kinase, myokinase, malic dehydrogenase, glutamic-pyruvic transaminase, glutamic-oxalacetic transaminase and α-glycerophosphate dehydrogenase ≤0.01%
shipped in   wet ice
storage temp.   2-8°C


General description

Lactic Dehydrogenase (LDH) has a total molecular weight of 140 kDa and is composed of 4 subunits which are designated M subunit (muscle) and H subunit (heart). These subunits may be mixed in any of 5 combinations (M4, M3H1, M2H2, MH3, and H4). Skeletal muscle contains LDH that is predominately M4 with some small amounts of M3H and traces of H2H2. The H and M subunits are quite similar in molecular weight, but differ substantially in amino acid composition. Rabbit muscle LDH dissociates into dimeric species (MW = ~70 kDa) in acetate-chloride at pH 5.0, the dissociation is reversible. Biochemistry, 13, 3527-3531 (1974). Oxidizes glyoxylate and lactate.
Isoelectric point: 8.4-8.6
Optimal pH : 7.5 .


L-Lactic Dehydrogenase from rabbit muscle has been used:
• for protein-binding measurement
• to detect the action of oxaloacetate decarboxylase
• to determine serum L- and D-lactate

Biochem/physiol Actions

Lactic dehydrogenase is responsible for the conversion of pyruvate to lactate in the fermentative metabolism.

Also catalyzes the oxidation of other L-2-hydroxymonocarboxylic acids.

Unit Definition

One unit will reduce 1.0 μmole of pyruvate to L-lactate per min at pH 7.5 at 37 °C.

Physical form

Crystalline suspension in 3.2 M (NH4)2SO4 solution, pH 6.0

Analysis Note

Protein determined by biuret.

Safety & Documentation

Safety Information

NONH for all modes of transport
WGK Germany 


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

HPLC Analysis of Protein Standards (1) on BIOshell™ A400 Protein C4

From our library of Articles, Sigma-Aldrich presents HPLC Analysis of Protein Standards (1) on BIOshell™ A400 Protein C4
Keywords: Chromatography, High performance liquid chromatography, Reversed-phase chromatography

Plasma Derived Proteins and Enzymes

Despite their complexity, blood and plasma are abundant biological resources for the discovery of drug targets and biomarkers for human disease. It is estimated that plasma may contain as many as 40,...
BioFiles 2006, 1.5, 2.
Keywords: Applications, Gas chromatography, Type

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