Hexokinase enzyme. Computer graphic representation of a molecule of hexokinase enzyme and glucose. The hexokinase molecule (blue) has a molecule of glucose (yellow) bound to its active site. Enzymes are proteins that work as catalysts to speed up chemical reactions in the body. The active site is the enzyme part that binds to the substance involved in the reaction (substrate), and is where the reaction takes place. Hexokinase promotes the conversion (phosphorylation) of glucose into glucose 6-phosphate in the body's cells. The cells then use the glucose 6-phosphate for when needed.
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