Glycerol kinase is a phosphotransferase enzyme involved in triglycerides and glycerophospholipids synthesis. Glycerol kinase catalyzes tge MgATP-dependent phosphorylation of glycerol to produce sn-glycerol-3-phosphate and is the rate limiting enzyme in the utilization of glycerol. It is also subject to feedback regulation by fructose-1,6-bisphosphate.
GK, Native (Cellulomonas sp.)
This enzyme is useful for enzymatic determination of glycerol and triglyceride when coupled with glycerol-3-phosphate dehydrogenase (=G-3-P DH, G3D-301), glycerol-3-phosphate oxidase (=G-3-P oxidase, G3O-301, G3O-311, G3O-321) or pyruvate kinase (PYK-301) and lactate dehydrogenase (LCD-209, LCD-211), lipoprotein lipase (LPL-311, LPL-314) in clinical analysis.
phosphoryl moiety of ATP to one of the primary hydroxyl group of glycerol, forming sn-glycerol-3-P. The enzyme has the highest specificity for glycerol, and also phosphorylates dihydroxyacetone and glyceraldehyde (Table 1,2). Mg++ is essentially required for the reaction.
Lyophilized powder containing phosphate buffer salts and sodium gluconate
Enzyme Commission Number
25-75 units/mg protein
mol wt ~128 kDa ((by gel filtration)
pH 5.5 x 10.0 (25°C, 20hr)
4.4 x 10-5M (Glycerol), 4.3 x 10-4M (ATP)
One unit will convert 1.0 μmole of glycerol and ATP to L-α-glycerophosphate and ADP per min at pH 9.8 at 25°C in a coupled system with PK/LDH.
9.8 (G-3-PDH system), 7.8 (G-3-P oxidase system)
below 40°C (pH 7.5, 15min)
p-Chloromercuribenzoate, heavy metal ions (Pb++, Fe++, Hg++, Ag+)
EC 18.104.22.168; glycerokinase; GK; ATP:glycerol-3-phosphotransferase; glycerol kinase (phosphorylating); glyceric kinase; 9030-66-4