5KNZ

Human Islet Amyloid Polypeptide Segment 19-SGNNFGAILSS-29 with Early Onset S20G Mutation Determined by MicroED


Experimental Data Snapshot

  • Method: ELECTRON CRYSTALLOGRAPHY
  • Resolution: 1.9 Å
  • Aggregation State: 3D ARRAY 
  • Reconstruction Method: CRYSTALLOGRAPHY 

wwPDB Validation 3D Report Full Report


This is version 1.5 of the entry. See complete history

Literature

Atomic structures of fibrillar segments of hIAPP suggest tightly mated beta-sheets are important for cytotoxicity.

Krotee, P.Rodriguez, J.A.Sawaya, M.R.Cascio, D.Reyes, F.E.Shi, D.Hattne, J.Nannenga, B.L.Oskarsson, M.E.Philipp, S.Griner, S.Jiang, L.Glabe, C.G.Westermark, G.T.Gonen, T.Eisenberg, D.S.

(2017) Elife 6: --

  • DOI: 10.7554/eLife.19273
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • hIAPP fibrils are associated with Type-II Diabetes, but the link of hIAPP structure to islet cell death remains elusive. Here we observe that hIAPP fibrils are cytotoxic to cultured pancreatic β-cells, leading us to determine the structure and cytoto ...

    hIAPP fibrils are associated with Type-II Diabetes, but the link of hIAPP structure to islet cell death remains elusive. Here we observe that hIAPP fibrils are cytotoxic to cultured pancreatic β-cells, leading us to determine the structure and cytotoxicity of protein segments composing the amyloid spine of hIAPP. Using the cryoEM method MicroED, we discover that one segment, 19-29 S20G, forms pairs of β-sheets mated by a dry interface that share structural features with and are similarly cytotoxic to full-length hIAPP fibrils. In contrast, a second segment, 15-25 WT, forms non-toxic labile β-sheets. These segments possess different structures and cytotoxic effects, however, both can seed full-length hIAPP, and cause hIAPP to take on the cytotoxic and structural features of that segment. These results suggest that protein segment structures represent polymorphs of their parent protein and that segment 19-29 S20G may serve as a model for the toxic spine of hIAPP.


    Organizational Affiliation

    Department of Molecular Biology and Biochemistry, University of California, Irvine, Irvine, United States.,Department of Biological Chemistry, Howard Hughes Medical Institute, University of California, Los Angeles, Los Angeles, United States.,Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, United States.,Brain Research Institute (BRI), University of California, Los Angeles, Los Angeles, United States.,Department of Medical Cell Biology, Uppsala University, Uppsala, Sweden.,Molecular Biology Institute, University of California, Los Angeles, Los Angeles, United States.,Biochemistry Department, Faculty of Science and Experimental Biochemistry Unit, King Fahd Medical Research Center, King Abdulaziz University, Jeddah, Saudi Arabia.,Department of Neurology, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, United States.,Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, United States.,UCLA-DOE Institute, University of California, Los Angeles, Los Angeles, United States.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
hIAPP(residues 19-29)S20G
A
11Homo sapiensMutation(s): 1 
Gene Names: IAPP
Find proteins for P10997 (Homo sapiens)
Go to Gene View: IAPP
Go to UniProtKB:  P10997
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON CRYSTALLOGRAPHY
  • Resolution: 1.9 Å
  • Aggregation State: 3D ARRAY 
  • Reconstruction Method: CRYSTALLOGRAPHY 
Software Package:
Software NamePurpose
XSCALEdata scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute on Aging (NIH/NIA)United StatesR01 AG029430
Howard Hughes Medical Institute (HHMI)United States--

Revision History 

  • Version 1.0: 2016-12-21
    Type: Initial release
  • Version 1.1: 2017-09-13
    Type: Author supporting evidence, Data collection
  • Version 1.2: 2018-04-25
    Type: Data collection
  • Version 1.3: 2018-06-06
    Type: Data collection, Experimental preparation, Refinement description
  • Version 1.4: 2019-09-04
    Type: Data collection, Database references
  • Version 1.5: 2019-11-20
    Type: Author supporting evidence