Overview
Glucokinase (GK) is a hexokinase isoenzyme that catalyzes the phosphorylation of glucose to glucose-6-phosphate, the first step in glycolysis. Unlike other hexokinases, it has a lower affinity for glucose and is not inhibited by its product, making it critical for glucose sensing in pancreatic beta cells and hepatocytes. This enzyme is encoded by the GCK gene and is primarily expressed in the liver and pancreas. Its unique kinetic properties allow it to function as a glucose sensor, playing a pivotal role in maintaining glucose homeostasis. Dysregulation of glucokinase activity is associated with metabolic disorders such as maturity-onset diabetes of the young (MODY) and hyperinsulinemia.
Physical and Chemical Properties
Glucokinase typically appears as a white to off-white lyophilized powder with a molecular weight of approximately 50-55 kDa. It exhibits high specificity for glucose, with a Km value significantly higher than other hexokinases, reflecting its role as a glucose sensor. The enzyme operates optimally at physiological pH (around 7.4) and requires Mg2+ as a cofactor for its catalytic activity. It is soluble in aqueous buffers and is relatively stable when stored at -20°C. Unlike other hexokinases, glucokinase is not inhibited by glucose-6-phosphate, allowing it to remain active even when cellular glucose levels are high.
Main Applications
Glucokinase is widely used in diabetes research due to its central role in glucose metabolism and insulin secretion. It serves as a target for drugs aimed at modulating blood glucose levels, particularly in type 2 diabetes. In the biotechnology sector, glucokinase is employed in diagnostic kits for measuring glucose levels and studying metabolic pathways. It is also used in enzymatic assays and as a reagent in biochemical research. Additionally, recombinant glucokinase is produced for therapeutic investigations, including gene therapy approaches for diabetes.
Safety and Storage
Glucokinase should be handled with standard laboratory precautions, including the use of gloves and protective eyewear. Avoid inhalation or direct contact with skin and eyes. In case of exposure, rinse thoroughly with water. For long-term storage, the enzyme should be kept at -20°C in a dry environment to maintain stability. Lyophilized preparations are generally stable for several years under these conditions, while solutions should be aliquoted to avoid repeated freeze-thaw cycles, which can degrade the enzyme's activity.
B2B Procurement Guide
When procuring glucokinase for industrial or research purposes, verify the enzyme's activity units (U/mg) and purity (typically ≥90% by SDS-PAGE). Suppliers should provide certificates of analysis detailing these specifications. Consider the intended application when selecting a product—research-grade enzymes may suffice for basic studies, while diagnostic or therapeutic applications may require higher purity levels. Bulk purchases should be negotiated with suppliers for cost efficiency, and stability data should be reviewed to ensure the product meets storage and handling requirements.
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