2obu

Solution structure of GIP in TFE/water

spinqualitylabelsall models 2obu, 20 NMR models Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2obu is a 1 chain structure. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Resources: FirstGlance, OCA, RCSB, PDBsum Function [GIP_HUMAN] Potent stimulator of insulin secretion and relatively poor inhibitor of gastric acid secretion. Publication Abstract from PubMed Glucose-dependent insulinotropic polypeptide (GIP) is a gastrointestinal incretin hormone, which modulates physiological insulin secretion. Because of its glucose-sensitive insulinotropic activity, there has been a considerable interest in utilizing the hormone as a potential treatment for type 2 diabetes. Structural parameters obtained from NMR spectroscopy combined with molecular modeling techniques play a vital role in the design of new therapeutic drugs. Therefore, to understand the structural requirements for the biological activity of GIP, the solution structure of GIP was investigated by circular dichroism (CD) followed by proton nuclear magnetic resonance (NMR) spectroscopy. CD studies showed an increase in the helical character of the peptide with increasing concentration of trifluoroethanol (TFE) up to 50%. Therefore, the solution structure of GIP in 50% TFE was determined. It was found that there was an alpha-helix between residues 6 and 29, which tends to extend further up to residue 36. The implications of the C-terminal extended helical segment in the inhibitory properties of GIP on gastric acid secretion are discussed. It is shown that the adoption by GIP of an alpha-helical secondary structure is a requirement for its biological activity. Knowledge of the solution structure of GIP will help in the understanding of how the peptide interacts with its receptor and aids in the design of new therapeutic agents useful for the treatment of diabetes. The bioactive conformation of glucose-dependent insulinotropic polypeptide by NMR and CD spectroscopy.,Alana I, Malthouse JP, O'Harte FP, Hewage CM Proteins. 2007 Jul 1;68(1):92-9. PMID:17393464 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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