5MGQ

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


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

The redox environment triggers conformational changes and aggregation of hIAPP in Type II Diabetes.

Rodriguez Camargo, D.C.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, A.K.Madl, T.Wanker, E.E.Conrad, M.de Angelis, M.H.Reif, B.

(2017) Sci Rep 7: 44041-44041

  • DOI: 10.1038/srep44041

  • PubMed Abstract: 
  • 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 cellula ...

    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 β-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 α-helical structure which is lacking in the reduced state of hIAPP. In healthy cells, this residual structure prevents the conversion into amyloidogenic aggregates.


    Organizational Affiliation

    Helmholtz Zentrum München, Ingolstädter Landstr. 1, Neuherberg 85764, Germany.,Munich Center for Integrated Protein Science (CIPS-M) at Department Chemie, Technische Universität München (TUM), Germany.,German Center for Diabetes Research (DZD e.V.), Neuherberg 85764, Germany.,Synaptic Systems GmbH, Rudolf-Wissell-Straße 28, Göttingen, 37079, Germany.,Institute of Molecular Biology &Biochemistry, Center of Molecular Medicine, Medical University of Graz, Austria.,Max-Delbrück-Center Berlin (MDC), Robert-Rössle-Str. 10, Berlin 13125, Germany.,Central European Institute of Technology (CEITEC), Masaryk University, Kamenice 5, Brno 62500, Czech Republic.,Technische Universität München, Center of Life and Food Sciences Weihenstephan, Freising 85354, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Islet amyloid polypeptide
A
37Homo sapiensMutation(s): 0 
Gene Names: IAPP
Find proteins for P10997 (Homo sapiens)
Go to Gene View: IAPP
Go to UniProtKB:  P10997
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
TYC
Query on TYC
A
NON-POLYMERC9 H12 N2 O2

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Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
German Research FoundationGermanyProject-B07
Helmholtz-GemeinschaftGermanyGrants Re1435
Ministry of Education, Youth and Sports of the Czech RepublicCzech RepublicCEITEC 2020 (LQ1601)

Revision History 

  • Version 1.0: 2017-03-29
    Type: Initial release
  • Version 1.1: 2017-09-06
    Type: Author supporting evidence
  • Version 1.2: 2018-01-17
    Type: Structure summary
  • Version 1.3: 2019-05-08
    Type: Data collection