5mgq

Solution structure of oxidized and amidated human IAPP (1-37), the diabetes II peptide.

spinqualitylabelsall models 5mgq, 20 NMR models Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5mgq is a 1 chain structure with sequence from Human. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. NonStd Res: TYC Gene: IAPP (HUMAN) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [IAPP_HUMAN] Selectively inhibits insulin-stimulated glucose utilization and glycogen deposition in muscle, while not affecting adipocyte glucose metabolism. Publication Abstract from PubMed Type II diabetes (T2D) is characterized by diminished insulin production and resistance of cells to insulin. Among others, endoplasmic reticulum (ER) stress is a principal factor contributing to T2D and induces a shift towards a more reducing cellular environment. At the same time, peripheral insulin resistance triggers the over-production of regulatory hormones such as insulin and human islet amyloid polypeptide (hIAPP). We show that the differential aggregation of reduced and oxidized hIAPP assists to maintain the redox equilibrium by restoring redox equivalents. Aggregation thus induces redox balancing which can assist initially to counteract ER stress. Failure of the protein degradation machinery might finally result in beta-cell disruption and cell death. We further present a structural characterization of hIAPP in solution, demonstrating that the N-terminus of the oxidized peptide has a high propensity to form an alpha-helical structure which is lacking in the reduced state of hIAPP. In healthy cells, this residual structure prevents the conversion into amyloidogenic aggregates. The redox environment triggers conformational changes and aggregation of hIAPP in Type II Diabetes.,Rodriguez Camargo DC, Tripsianes K, Buday K, Franko A, Gobl C, Hartlmuller C, Sarkar R, Aichler M, Mettenleiter G, Schulz M, Boddrich A, Erck C, Martens H, Walch AK, Madl T, Wanker EE, Conrad M, de Angelis MH, Reif B Sci Rep. 2017 Mar 13;7:44041. doi: 10.1038/srep44041. PMID:28287098 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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