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: https://doi.org/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)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Islet amyloid polypeptide
A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P
A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P
37Homo sapiensMutation(s): 0 
Gene Names: IAPP
UniProt & NIH Common Fund Data Resources
Find proteins for P10997 (Homo sapiens)
Explore P10997 
Go to UniProtKB:  P10997
PHAROS:  P10997
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP10997
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.20 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONRELION3.0.5
MODEL REFINEMENTPHENIX1.11

Structure Validation

View Full Validation Report



View more in-depth experimental data
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