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83330 Sigma

Pyruvate Kinase from rabbit muscle

crystalline suspension in 3.8 M ammonium sulfate solution, ~350 U/mg protein (10-40 mg/ml)

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   crystalline suspension in 3.8 M ammonium sulfate solution
mol wt   Mr ~230000
pH   ~6
foreign activity   lactate dehydrogenase ≤0.01%
storage temp.   2-8°C


Unit Definition

1 U corresponds to the amount of enzyme which catalyzes the transphosphorylation of 1 μmol PEP per min at pH 7.4 and 25 °C

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 catalyzes the conversion of phosphoenolpyruvate to pyruvate, whitch is the rate-limiting final step in glycolysis.

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WGK Germany 
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Enzymes & Proteins

Application Index | Enzyme Index | Substrate Index | Inhibitor Index | Cofactor Index | Lectin Index
Keywords: Cell signaling, Diagnostic, Drug discovery, Molecular biology

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