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H6380 Sigma

Hexokinase from Saccharomyces cerevisiae

lyophilized powder, ≥350 units/mg protein, Protein ≥10 % by biuret

Synonym: ATP:D-Hexose-6-phosphotransferase, Hexokinase from yeast



Related Categories 2.7.x.x Phosphorus containing groups, 2.x.x.x Transferases, Biochemicals and Reagents, Carbohydrate Metabolism, Cell Biology,
form   lyophilized powder
composition   Protein, ≥10% biuret
foreign activity   L-Glutamic dehydrogenase ≤0.05%
  Creatine phosphokinase, myokinase, 6-phosphogluconic dehydrogenase and alcohol dehydrogenase ≤0.001%
  Glucose-6-phosphate dehydrogenase ≤0.005%
  Glutathione reductase ≤0.005%
  Phosphoglucose isomerase ≤0.002%
storage temp.   2-8°C
Gene Information   bakers yeast ... HXK1(850614), HXK2(852639)


Other Notes

Predominantly the PII isoform, produced from an overexpressing yeast strain.


1500 units in poly bottle

Unit Definition

One unit will phosphorylate 1.0 μmole of D-glucose per min at pH 7.6 at 25 °C, unless otherwise indicated below.

Physical form

Lyophilized powder containing phosphate/citrate pH approx. 7.0

Biochem/physiol Actions

Catalyzes the phosphorylation of D-hexose sugars at the C6 position utilizing ATP as a phosphate source.

The rate of phosphorylation varies with different hexoses (pH 7.5, 30 °C).
D-fructose KM: 0.33 mM
D-glucose KM: 0.12 mM
D-mannose KM: 0.05 mM

Yeast hexokinase exists as two similar isoforms, PI and PII (A and B), with isoelectric points of 5.25 and 4, respectively.

Molecular Weight: ~ 54 kDa (monomer)
~110 kDa (dimer)
Optimal pH: 7.5 to 9.0
Extinction Coefficient: E1% = 8.85 (PI) and 9.47 (PII) at 280 nm

Activators: Hexokinase requires Mg2+ ions (KM = 2.6 mM) for activity. Hexokinase is activated by catecholamines and related compounds.

Inhibitors: sorbose-1-phosphate, polyphosphates, 6-deoxy-6-fluoroglucose, 2-C-hydroxy-methylglucose, xylose, lyxose, and thiol reactive compounds (Hg2+ and 4-chloromercuribenzoate)

Price and Availability

All labs need water

Biomedical Applications
Safety & Documentation

Safety Information

NONH for all modes of transport
WGK Germany 
Protocols & Articles


Enzymatic Assay of Hexokinase

This procedure applies to most products1 that have a specification for Hexokinase determination by enzymatic determination.
Keywords: Extinction coefficient

Related Content

Enzymes & Proteins

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

Peer-Reviewed Papers


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