View source for 2qkh

[[Image:2qkh.jpg|left|200px]]<br /><applet load="2qkh" size="350" color="white" frame="true" align="right" spinBox="true" 
caption="2qkh, resolution 1.900&Aring;" />
'''Crystal structure of the extracellular domain of human GIP receptor in complex with the hormone GIP'''<br />

==Overview==
Incretins, endogenous polypeptide hormones released in response to food, intake, potentiate insulin secretion from pancreatic beta cells after oral, glucose ingestion (the incretin effect). This response is signaled by the, two peptide hormones glucose-dependent insulinotropic polypeptide (GIP), (also known as gastric inhibitory polypeptide) and glucagon-like peptide 1, through binding and activation of their cognate class 2 G protein-coupled, receptors (GPCRs). Because the incretin effect is lost or significantly, reduced in patients with type 2 diabetes mellitus, glucagon-like peptide 1, and GIP have attracted considerable attention for their potential in, antidiabetic therapy. A paucity of structural information precludes a, detailed understanding of the processes of hormone binding and receptor, activation, hampering efforts to develop novel pharmaceuticals. Here we, report the crystal structure of the complex of human GIP receptor, extracellular domain (ECD) with its agonist, the incretin GIP(1-42). The, hormone binds in an alpha-helical conformation in a surface groove of the, ECD largely through hydrophobic interactions. The N-terminal ligand, residues would remain free to interact with other parts of the receptor., Thermodynamic data suggest that binding is concomitant with structural, organization of the hormone, resulting in a complex mode of, receptor-ligand recognition. The presentation of a well structured, alpha-helical ligand by the ECD is expected to be conserved among other, hormone receptors of this class.

==About this Structure==
2QKH is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] with <scene name='pdbligand=QKH:'>QKH</scene> and <scene name='pdbligand=TAR:'>TAR</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2QKH OCA]. 

==Reference==
Crystal structure of the incretin-bound extracellular domain of a G protein-coupled receptor., Parthier C, Kleinschmidt M, Neumann P, Rudolph R, Manhart S, Schlenzig D, Fanghanel J, Rahfeld JU, Demuth HU, Stubbs MT, Proc Natl Acad Sci U S A. 2007 Aug 28;104(35):13942-7. Epub 2007 Aug 21. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=17715056 17715056]
[[Category: Homo sapiens]]
[[Category: Protein complex]]
[[Category: Demuth, H.U.]]
[[Category: Fanghanel, J.]]
[[Category: Kleinschmidt, M.]]
[[Category: Manhart, S.]]
[[Category: Neumann, P.]]
[[Category: Parthier, C.]]
[[Category: Rahfeld, J.U.]]
[[Category: Rudolph, R.]]
[[Category: Schlenzig, D.]]
[[Category: Stubbs, M.T.]]
[[Category: QKH]]
[[Category: TAR]]
[[Category: alternative splicing]]
[[Category: cleavage on pair of basic residues]]
[[Category: diabetes]]
[[Category: ecd]]
[[Category: extracellular domain]]
[[Category: g-protein coupled receptor]]
[[Category: glugacon receptor family]]
[[Category: glycoprotein]]
[[Category: gpcr]]
[[Category: helix formation]]
[[Category: hormone recognition fold]]
[[Category: hormone-gpcr complex]]
[[Category: incretin]]
[[Category: ligand binding domain]]
[[Category: membrane]]
[[Category: polymorphism]]
[[Category: signaling protein/hormone complex]]
[[Category: transducer]]
[[Category: transmembrane]]

''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Wed Jan 23 13:43:59 2008''