Overview
Hexokinase (EC 2.7.1.1) is a ubiquitous enzyme that initiates glycolysis by phosphorylating six-carbon sugars like glucose. Found in all living organisms, it exists in multiple isoforms with tissue-specific distributions. Hexokinase I-III are widely expressed in mammalian tissues, while hexokinase IV (glucokinase) is liver-specific. As a regulatory enzyme, hexokinase controls metabolic flux and is implicated in diseases such as cancer and diabetes. Industrial-scale production utilizes recombinant E. coli or yeast expression systems, with research-grade variants commonly sourced from rabbit muscle or microbial fermentation.
Physical and Chemical Properties
Hexokinase operates optimally at physiological pH (7.0-7.5) and requires Mg2+ as a cofactor. The enzyme exhibits Michaelis-Menten kinetics, with Km values varying by isoform (e.g., HKII has higher glucose affinity than glucokinase). Thermostability ranges from 30-50°C, with rapid denaturation above 60°C. Structural studies reveal a bilobal architecture: a small lobe binds ATP, while the large lobe accommodates hexose substrates. Inhibitors like 2-deoxyglucose-6-phosphate and alloxan are used experimentally to modulate activity. Commercial preparations typically contain stabilizers like glycerol or salts to prolong shelf life.
Main Applications
In diagnostics, hexokinase is integral to blood glucose test strips and clinical analyzers, often coupled with glucose-6-phosphate dehydrogenase (G6PDH) for NADPH detection. Pharmaceutical applications include drug screening for metabolic disorders and cancer therapeutics targeting the Warburg effect. Industrial uses span bioremediation (sugar metabolism in wastewater treatment) and biofuel production. Research laboratories employ hexokinase for metabolic pathway studies, enzyme-coupled assays, and as a model system for allosteric regulation investigations.
Safety and Storage
While hexokinase poses minimal acute hazards, proper lab practices are essential. Lyophilized powder may become airborne; use fume hoods during reconstitution. Solutions should avoid bacterial contamination and protease degradation by including azide or EDTA. Long-term storage requires aliquoting at -80°C with cryoprotectants. Activity loss occurs after >3 freeze-thaw cycles. SDS-PAGE analysis is recommended periodically to check for degradation, particularly for kinetic studies requiring precise quantification.
B2B Procurement Guide
Specify required isoform (e.g., HKII for cancer research), activity (≥100 U/mg preferred), and endotoxin levels (<0.1 EU/μg for cell culture). Bulk orders (gram-scale) from GMP facilities can reduce costs by 30-50% for pharmaceutical applications. Leading suppliers include Sigma-Aldrich (H4502), Roche Diagnostics, and recombinant specialty producers like BioVision. Request Certificates of Analysis for lot-specific activity and purity data. Consider lyophilized vs. liquid formulations based on usage frequency and cold chain logistics.
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