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- EMDB-65957: Cryo-EM map of hIAPP fibrils extracted from a donor with T2D and ... -

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Basic information

Entry
Database: EMDB / ID: EMD-65957
TitleCryo-EM map of hIAPP fibrils extracted from a donor with T2D and Intraductal Papillary Mucinous Neoplasm
Map data
Sample
  • Tissue: hIAPP fibrils
    • Protein or peptide: Islet amyloid polypeptide
KeywordsAmyloid fibrils / type II diabetes / hIAPP / PROTEIN FIBRIL
Biological speciesHomo sapiens (human)
Methodhelical reconstruction / cryo EM / Resolution: 3.42 Å
AuthorsCao Q / Liu W
Funding support China, 1 items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC) China
CitationJournal: Cell / Year: 2026
Title: Structure of pancreatic hIAPP fibrils derived from patients with type 2 diabetes.
Authors: Wenjing Liu / Jianting Han / Wei Gong / Fei Zhang / Qin Cao /
Abstract: Type 2 diabetes (T2D) impacts the quality of life and lifespan of nearly 10% of the global population. Human islet amyloid polypeptide (hIAPP) constitutes a major component of islet amyloid ...Type 2 diabetes (T2D) impacts the quality of life and lifespan of nearly 10% of the global population. Human islet amyloid polypeptide (hIAPP) constitutes a major component of islet amyloid deposition in patients with T2D, with hIAPP fibrils believed to play a key role in the pathogenesis of T2D. In this study, we determined the cryo-electron microscopy (cryo-EM) structure of hIAPP fibrils extracted from surgically resected pancreases of three donors with T2D. These fibrils exhibit a uniform morphology, comprising two symmetrical protofilaments encompassing residues 2-37 of hIAPP and adopting an Ω-shaped fold. The structure of pancreatic hIAPP fibrils differs from that of fibrils formed in vitro. Additional densities were observed in the pancreatic hIAPP fibrils, suggesting ligand binding that may play significant roles in the pathogenesis of T2D. Collectively, our study presents the atomic structure of pathological hIAPP fibrils, contributing to the therapeutic and mechanistic exploration of T2D.
History
DepositionAug 25, 2025-
Header (metadata) releaseJan 14, 2026-
Map releaseJan 14, 2026-
UpdateJan 14, 2026-
Current statusJan 14, 2026Processing site: PDBc / Status: Released

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Structure visualization

Supplemental images

emd_65957.png

Downloads & links

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Map

FileDownload / File: emd_65957.map.gz / Format: CCP4 / Size: 12.9 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
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Others
AxesX (Sec.)Y (Row.)Z (Col.)
0.93 Å/pix.
x 150 pix.
= 139.8 Å		0.93 Å/pix.
x 150 pix.
= 139.8 Å		0.93 Å/pix.
x 150 pix.
= 139.8 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

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Images are generated by Spider.

Voxel sizeX=Y=Z: 0.932 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 2.4
Minimum - Maximum-5.804212 - 9.197882999999999
Average (Standard dev.)0.000000000004021 (±1.0)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderZYX
Origin-75-75-75
Dimensions150150150
Spacing150150150
CellA=B=C: 139.8 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #1

Fileemd_65957_half_map_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #2

Fileemd_65957_half_map_2.map
Projections & Slices
AxesZYX

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Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : hIAPP fibrils

EntireName: hIAPP fibrils
Components
  • Tissue: hIAPP fibrils
    • Protein or peptide: Islet amyloid polypeptide

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Supramolecule #1: hIAPP fibrils

SupramoleculeName: hIAPP fibrils / type: tissue / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: Islet amyloid polypeptide

MacromoleculeName: Islet amyloid polypeptide / type: protein_or_peptide / ID: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
SequenceString:
KCNTATCATQ RLANFLVHSS NNFGAILSST NVGSNTY

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Experimental details

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Structure determination

Methodcryo EM
Processinghelical reconstruction
Aggregation statefilament

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Sample preparation

BufferpH: 7.4
VitrificationCryogen name: ETHANE / Instrument: FEI VITROBOT MARK II

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: FEI FALCON IV (4k x 4k) / Average electron dose: 40.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 3.5 µm / Nominal defocus min: 0.8 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Final reconstructionApplied symmetry - Helical parameters - Δz: 4.76 Å
Applied symmetry - Helical parameters - Δ&Phi: -1.93 °
Applied symmetry - Helical parameters - Axial symmetry: C2 (2 fold cyclic)
Resolution.type: BY AUTHOR / Resolution: 3.42 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION / Number images used: 6904
CTF correctionType: NONE
Startup modelType of model: NONE
Final angle assignmentType: NOT APPLICABLE
FSC plot (resolution estimation)

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