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P9136 Sigma-Aldrich

Pyruvate Kinase from rabbit muscle

Type III, lyophilized powder, 350-600 units/mg protein

Synonym: ATP:pyruvate 2-O-phosphotransferase, PK



Related Categories 2.7.x.x Phosphorus containing groups, 2.x.x.x Transferases, Application Index, Biochemicals and Reagents, Cell Biology,
Quality Level   200
type   Type III
form   lyophilized powder
specific activity   350-600 units/mg protein
mol wt   237 kDa
foreign activity   lactic dehydrogenase, creatine phosphokinase, phosphoglucomutase, and myokinase ≤0.01%
storage temp.   −20°C


General description

Pyruvate Kinase (PK) is a glycolysis enzyme and has four isozymes L, R, M1, and M2. The L isozyme is localized in gluconeogenic tissues, particularly in the liver. Whereas the R and M1 are localized in the adult skeletal muscles, heart, brain and erythrocytes, respectively. M2 is localized in the nucleus of the cells.


Pyruvate Kinase from rabbit muscle has been used to convert adenosine diphosphate (ADP) to adenosine triphosphate (ATP) in Pseudomonas putida cells.

Pyruvate kinase has been used in plant spectrophotometric assays to measure ATP hydrolysis . Pyruvate kinase is also used to study pyruvate kinase (PK) deficiency .


1000, 5000, 25000, 50000 units in glass bottle

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 (PK) catalyzes an important process of transferring phosphate group from phosphoenolpyruvate (PEP) to adenosine diphosphate (ADP). This reaction results in the conversion of PEP to pyruvate and adenosine triphosphate (ATP). Pyruvate kinase plays a major role in glycolysis and gluconeogenesis. High levels of pyruvate kinase M2 (PKM2) inhibits cell proliferation and tumor growth. Deficiency of PK in red blood cells (RBC) leads to non-spherocytic hemolytic anaemia. In human erythrocytes, deficiency of PK induces a protective effect against Plasmodium falciparum.

Unit Definition

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

Analysis Note

Protein determined by biuret.

Safety & Documentation

Safety Information

Personal Protective Equipment 
NONH for all modes of transport
WGK Germany 
Protocols & Articles

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