6dhl | pdb_00006dhl

Bovine glutamate dehydrogenase complexed with epicatechin-3-gallate (ECG)

spinqualitylabelsall models 6dhl, resolution 3.62Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6dhl is a 12 chain structure with sequence from Bos taurus. This structure supersedes the now removed PDB entry 3mvq. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: XEG Activity: Glutamate dehydrogenase, with EC number 1.4.1.2 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Glutamate dehydrogenase (GDH) catalyzes the oxidative deamination of L-glutamate and, in animals, is extensively regulated by a number of metabolites. Gain of function mutations in GDH that abrogate GTP inhibition causes the hyperinsulinism/hyperammonemia syndrome (HHS), resulting in increased pancreatic beta-cells responsiveness to leucine and susceptibility to hypoglycemia following high protein meals. We have previously shown that two of the polyphenols from green tea (EGCG and ECG) inhibit GDH in-vitro and that EGCG blocks GDH-mediated insulin secretion in wild type rat islets. Using structural and site-directed mutagenesis studies, we demonstrate that ECG binds to the same site as the allosteric regulator, ADP. Perifusion assays using pancreatic islets from transgenic mice expressing a human HHS form of GDH demonstrate that the hyper-response to glutamine caused by dysregulated GDH is blocked by the addition of EGCG. As observed in HHS patients, these transgenic mice are hypersensitive to amino acid feeding and this is abrogated by oral administration of EGCG prior to challenge. Finally, the low basal blood glucose level in the HHS mouse model is improved upon chronic administration of EGCG. These results suggest that this common natural product, or some derivative thereof, may prove useful in controlling this genetic disorder. Of broader clinical implication is that other groups have shown restriction of glutamine catabolism via these GDH inhibitors can be useful in treating various tumors. This HHS transgenic mouse model offers a highly useful means to test these agents in-vivo. GREEN TEA POLYPHENOLS CONTROL DYSREGULATED GLUTAMATE DEHYDROGENASE IN TRANSGENIC MICE BY HIJACKING THE ADP ACTIVATION SITE.,Li C, Li M, Chen P, Narayan S, Matschinsky FM, Bennett MJ, Stanley C, Smith TJ J Biol Chem. 2011 Aug 3. PMID:21813650 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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