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F1757 Sigma

Fumarase from porcine heart

ammonium sulfate suspension, 300-500 units/mg protein (biuret)

Synonym: L-Malate hydrolyase, Fumarate hydratase



Related Categories 4.2.x.x C-O bonds, 4.x.x.x Lyases, Biochemicals and Reagents, Cell Biology, Enzyme Class Index,
form   ammonium sulfate suspension
foreign activity   malic dehydrogenase ≤0.1%
storage temp.   2-8°C


Preparation Note

Isolated by the method of Beeckmans, S., and Kanarek, L., Eur. J. Biochem., 78, 437 (1977). Affinity purified.

Unit Definition

One unit will convert 1.0 μmole of L-malate to fumarate per min at pH 7.6 at 25 °C.

Physical form

Suspension in 3.2 M (NH4)2SO4, 0.05 M KH2PO4, pH 7.5, 0.014 M 2-mercaptoethanol


Fumarase is used as a protein calibration standard in the purification of intact DNA polymerase a/primase from mouse cells.

Biochem/physiol Actions

Fumarase catalyzes the reversible hydration of fumarate to malate. In its mitochondrial form, fumarate is involved in the Krebs Cycle, while the cytosolic form is involved in amino acid metabolism<<<New>>>.

General description

Fumarase (FH in human) is a well-known tricarboxylic-acid-cycle enzyme found in both the cytoplasm and mitochondria of all eukaryotes.

Price and Availability

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Biomedical Applications

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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 Fumarase

To standardize a procedure for the enzymatic assay of Fumarase in Analytical Services at Sigma-Aldrich - St. Louis.
Keywords: Extinction coefficient

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