GCK, Recombinant, Human, aa16-465, His-tag (Glucokinase, FGQTL3, GLK, Hexokinase-4, Hexokinase-D, HHF3, HK4, HXKP, LGLK)

Supplier:

United States Biological

Cat no: 145794

GCK, Recombinant, Human, aa16-465, His-tag (Glucokinase, FGQTL3, GLK, Hexokinase-4, Hexokinase-D, HHF3, HK4, HXKP, LGLK)

Hexokinases phosphorylate hexose to form hexose 6-phosphate, the first step for hexose metabolism. There are four mammalian hexokinases (I, II, III and IV) and hexokinase IV is commonly known as glucose kinase (GCK). Unlike hexokinase I, II and III, which have high affinity for glucose and are strongly inhibited by the product, glucose-6-phosphate (1), GCK has much lower affinity for glucose and is not inhibited by the product (2, 3). Consequently, GCK has a Km for glucose of ~7mM (4), which is 100 times higher than that of hexokinase I, II, and III. This unique enzymatic property of GCK allows it to respond to blood glucose levels and contribute to the maintenance of blood glucose levels within the normal physiological range of 4mM to 6mM. In the pancreatic islets, GCK serves as a glucose sensor to control insulin release in the beta cells, and to control glucagon release in the alpha cells (5). In hepatocytes, GCK responds to changes of ambient glucose levels by increasing or reducing glycogen synthesis. Mutations in GCK have been associated with non-insulin-dependent diabetes mellitus (6, 7), maturity-onset diabetes of the young type 2 (8), and hyperinsulinemia of infancy (9). The enzyme activity was measured using a phosphatase coupled kinase assay (4).\n\nSource:\nRecombinant protein corresponding to aa16-465 from human Glucokinase/GCK, fused to his-tag, expressed in E. coli.\n\nMolecular Weight: \n~60-65kD\n\nEndotoxin:\n<1.0EU/1ug (LAL method).\n\nStorage and Stability:\nMay be stored at 4 degrees C for short-term only. Aliquot to avoid repeated freezing and thawing. Store at -20 degrees C. Aliquots are stable for 12 months. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap.

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SPECIFICATIONS

Catalog Number

145794

Size

20ug

Form

Supplied as a liquid in Tris, NaCl, Brii-35, DTT. BSA free.

Purity

~90% (SDS

References

1. Aleshin, A.E. et al.(1998) Structure 6:39. 2. Takeda, J. et al. (1993) J. Biol. Chem. 268:15200. 3. Lange, A.J. et al. (1991) Biochem. J. 277:159. 4. Wu, Z.L. (2011) PLoS ONE 6(8):e23172. 5. Xu, L.Z. et al. (1995) J. Biol. Chem. 270:9939. 6. Gidh

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SUPPLIER INFO

United States Biological

Address:

4 Technology Way, Salem, MA 01970, US

Phone:

+1 800 520 3011

Website:

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