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Pyruvate Kinase from rabbit muscle

Type II, ammonium sulfate suspension, 350-600 units/mg protein

ATP:pyruvate 2-O-phosphotransferase, PK
CAS Number:
Enzyme Commission number:
MDL number:

biological source

rabbit muscle

Quality Level


Type II


ammonium sulfate suspension

specific activity

350-600 units/mg protein

mol wt

237 kDa

foreign activity

lactic dehydrogenase, creatine phosphokinase, and myokinase ≤0.01%
phosphoglucomutase ≤0.05%

storage temp.


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General description

Pyruvate kinase from rabbit muscle catalyzes an ATP-dependent phosphorylation of glycolate to yield 2-phosphoglycolate.


Pyruvate kinase from rabbit muscle has been used in a structural study to understand the reaction mechanism of the final step in glycolysis. It has also been used in a study to investigate ATP-dependent phosphorylation of α-substituted carboxylic acids.

Biochem/physiol Actions

Molecular Weight: 237 kDa and exists as a tetramer of four equal subunits of molecular weight 57 kDa.
Isoelectric Point: 7.6
Optimal pH: ∼7.5
Optimal Temperature: 25°C
ΕA280 = 0.54 for 1 mg(p)/ml, 1 cm path
Reported KM values are ATP (0.86 mM), pyruvate (10 mM), ADP (0.3 mM), and PEP (0.07 mM) in Tris buffer at pH 7.4 and 30 °C. Pyruvate kinase is highly specific for phosphoenolpyruvate, but can utilize other dinucleotide triphosphates as substrates in place of ATP including GTP, ITP, dATP, UTP, and CTP.
Pyruvate kinase from rabbit muscle can be activated by histidine and inhibited by low levels of zinc (Zn2+).

Unit Definition

One unit will convert 1.0 μmole of phospho(enol)pyruvate to pyruvate per min at pH 7.6 at 37 °C.

Physical form

Suspension in 3.2 M (NH4)2SO4 solution, pH 6

Analysis Note

Protein determined by biuret.

Storage Class Code

12 - Non Combustible Liquids



Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificate of Analysis

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Certificate of Origin

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