6Y1A

Amyloid fibril structure of islet amyloid polypeptide


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.20 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Cryo-EM structure of islet amyloid polypeptide fibrils reveals similarities with amyloid-beta fibrils.

Roder, C.Kupreichyk, T.Gremer, L.Schafer, L.U.Pothula, K.R.Ravelli, R.B.G.Willbold, D.Hoyer, W.Schroder, G.F.

(2020) Nat Struct Mol Biol 27: 660-667

  • DOI: 10.1038/s41594-020-0442-4
  • Primary Citation of Related Structures:  
    6Y1A

  • PubMed Abstract: 
  • Amyloid deposits consisting of fibrillar islet amyloid polypeptide (IAPP) in pancreatic islets are associated with beta-cell loss and have been implicated in type 2 diabetes (T2D). Here, we applied cryo-EM to reconstruct densities of three dominant IAPP fibril polymorphs, formed in vitro from synthetic human IAPP ...

    Amyloid deposits consisting of fibrillar islet amyloid polypeptide (IAPP) in pancreatic islets are associated with beta-cell loss and have been implicated in type 2 diabetes (T2D). Here, we applied cryo-EM to reconstruct densities of three dominant IAPP fibril polymorphs, formed in vitro from synthetic human IAPP. An atomic model of the main polymorph, built from a density map of 4.2-Å resolution, reveals two S-shaped, intertwined protofilaments. The segment 21-NNFGAIL-27, essential for IAPP amyloidogenicity, forms the protofilament interface together with Tyr37 and the amidated C terminus. The S-fold resembles polymorphs of Alzheimer's disease (AD)-associated amyloid-β (Aβ) fibrils, which might account for the epidemiological link between T2D and AD and reports on IAPP-Aβ cross-seeding in vivo. The results structurally link the early-onset T2D IAPP genetic polymorphism (encoding Ser20Gly) with the AD Arctic mutation (Glu22Gly) of Aβ and support the design of inhibitors and imaging probes for IAPP fibrils.


    Related Citations: 
    • Amyloid fibril structure of islet amyloid polypeptide by cryo-electron microscopy reveals similarities with amyloid beta
      Roeder, C., Kupreichyk, T., Gremer, L., Schaefer, L.U., Pothula, K.R., Ravelli, R.B.G., Willbold, D., Hoyer, W., Schroder, G.F.
      (2020) Biorxiv --: --

    Organizational Affiliation

    Physics Department, Heinrich Heine University Düsseldorf, Düsseldorf, Germany. gu.schroeder@fz-juelich.de.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Islet amyloid polypeptide
A, B, C, D, E, F, G, H
A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P
37Homo sapiensMutation(s): 0 
Gene Names: IAPP
Find proteins for P10997 (Homo sapiens)
Explore P10997 
Go to UniProtKB:  P10997
NIH Common Fund Data Resources
PHAROS:  P10997
Protein Feature View
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.20 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
European Research Council (ERC)European Union726368

Revision History  (Full details and data files)

  • Version 1.0: 2020-03-04
    Type: Initial release
  • Version 1.1: 2020-07-22
    Changes: Database references