Hexokinase is the first enzyme in the glycolytic pathway, catalyzing the transfer of a phosphoryl group from ATP to glucose to form glucose-6-phosphate and ADP. In mammals, four distinct enzymes-types 1 to 4 hexokinases-have been identified. The enzyme is found in most cells, but there is tissue specificity for the particular type of hexokinase. Hexokinase4 is found in the liver and pancreatic beta-cells, where it is controlled by insulin (activation) and glucagon (inhibition). In pancreatic beta-cells, type IV enzyme acts as a glucose sensor to modify insulin secretion. Hexokinase4 is commonly called ‘glucokinase’. Recombinant human Hexokinase4, fused to His-tag at N-terminus, was expressed in E.coli and purified by using conventional chromatography techniques. Synonyms: GCK, Hexokinase 4, EC 2.7.1.2, Hexokinase type IV, HK IV, Hexokinase-4, HK4, Hexokinase-D, Glucokinase, ATP D hexose 6 phosphotransferase, GK, GLK, Glucokinase, Glucokinase isoform 1, Hexokinase 4, Hexokinase D, Hexokinase D pancreatic isozyme, Hexokinase4, HexokinaseD, HHF 3, HHF3, HK 4, HXKP, Maturity onset diabetes of the young 2, MODY 2, MODY2. NCBI no.: NP_000153