Hexokinase from Microorganism D-hexose + ATP ----> D-Hexose-6-Phosphate + ADP+ Mg2+ D-hexose + ATP <---- D-Hexose-6-Phosphate + ADP+ Mg2+ This enzyme is used for enzymatic determination of glucose and adenosine- 5'-triphosphate (ATP) when coupled with glucose-6-phosphate ehydrogenase G-6-PDH (G6D-311, G6D-321).