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- PDB-6zrf: amyloid structure of amylin (IAPP - islet amyloid polypeptide) -

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Basic information

Entry
Database: PDB / ID: 6zrf
Titleamyloid structure of amylin (IAPP - islet amyloid polypeptide)
ComponentsIslet amyloid polypeptide
KeywordsPROTEIN FIBRIL / amyloid fibril type-2-diabetes hormone
Function / homology
Function and homology information


amylin receptor 3 signaling pathway / amylin receptor 2 signaling pathway / amylin receptor 1 signaling pathway / amylin receptor signaling pathway / Calcitonin-like ligand receptors / negative regulation of amyloid fibril formation / negative regulation of bone resorption / eating behavior / negative regulation of osteoclast differentiation / Regulation of gene expression in beta cells ...amylin receptor 3 signaling pathway / amylin receptor 2 signaling pathway / amylin receptor 1 signaling pathway / amylin receptor signaling pathway / Calcitonin-like ligand receptors / negative regulation of amyloid fibril formation / negative regulation of bone resorption / eating behavior / negative regulation of osteoclast differentiation / Regulation of gene expression in beta cells / positive regulation of cAMP/PKA signal transduction / bone resorption / negative regulation of protein-containing complex assembly / sensory perception of pain / positive regulation of calcium-mediated signaling / osteoclast differentiation / hormone activity / cell-cell signaling / amyloid-beta binding / G alpha (s) signalling events / positive regulation of MAPK cascade / positive regulation of apoptotic process / receptor ligand activity / Amyloid fiber formation / signaling receptor binding / neuronal cell body / apoptotic process / lipid binding / signal transduction / extracellular space / extracellular region / identical protein binding
Similarity search - Function
Islet amyloid polypeptide / Calcitonin-like / Calcitonin peptide-like / Calcitonin, conserved site / Calcitonin / CGRP / IAPP family signature. / calcitonin / Calcitonin/adrenomedullin / Calcitonin / CGRP / IAPP family
Similarity search - Domain/homology
Islet amyloid polypeptide
Similarity search - Component
Biological speciessynthetic construct (others)
MethodELECTRON MICROSCOPY / helical reconstruction / cryo EM / Resolution: 3.6 Å
AuthorsGallardo, R.U. / Iadanza, M.G. / Ranson, N.A. / Radford, S.E.
Funding support United Kingdom, 2items
OrganizationGrant numberCountry
Wellcome Trust204963 United Kingdom
Wellcome Trust108466/Z/15/Z United Kingdom
CitationJournal: Nat Struct Mol Biol / Year: 2020
Title: Fibril structures of diabetes-related amylin variants reveal a basis for surface-templated assembly.
Authors: Rodrigo Gallardo / Matthew G Iadanza / Yong Xu / George R Heath / Richard Foster / Sheena E Radford / Neil A Ranson /
Abstract: Aggregation of the peptide hormone amylin into amyloid deposits is a pathological hallmark of type-2 diabetes (T2D). While no causal link between T2D and amyloid has been established, the S20G ...Aggregation of the peptide hormone amylin into amyloid deposits is a pathological hallmark of type-2 diabetes (T2D). While no causal link between T2D and amyloid has been established, the S20G mutation in amylin is associated with early-onset T2D. Here we report cryo-EM structures of amyloid fibrils of wild-type human amylin and its S20G variant. The wild-type fibril structure, solved to 3.6-Å resolution, contains two protofilaments, each built from S-shaped subunits. S20G fibrils, by contrast, contain two major polymorphs. Their structures, solved at 3.9-Å and 4.0-Å resolution, respectively, share a common two-protofilament core that is distinct from the wild-type structure. Remarkably, one polymorph contains a third subunit with another, distinct, cross-β conformation. The presence of two different backbone conformations within the same fibril may explain the increased aggregation propensity of S20G, and illustrates a potential structural basis for surface-templated fibril assembly.
History
DepositionJul 13, 2020Deposition site: PDBE / Processing site: PDBE
Revision 1.0Sep 30, 2020Provider: repository / Type: Initial release
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Revision 1.1Oct 14, 2020Group: Derived calculations
Category: pdbx_struct_sheet_hbond / struct_sheet ...pdbx_struct_sheet_hbond / struct_sheet / struct_sheet_order / struct_sheet_range
Revision 1.2Nov 18, 2020Group: Database references / Category: citation / citation_author
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation_author.identifier_ORCID
Revision 1.3Apr 9, 2025Group: Data collection / Database references / Structure summary
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / database_2 / em_admin / pdbx_entry_details / pdbx_modification_feature
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession ..._database_2.pdbx_DOI / _database_2.pdbx_database_accession / _em_admin.last_update / _pdbx_entry_details.has_protein_modification
Revision 1.1Apr 9, 2025Data content type: EM metadata / Data content type: EM metadata / EM metadata / Group: Database references / Experimental summary / Data content type: EM metadata / EM metadata / Category: database_2 / em_admin / Data content type: EM metadata / EM metadata / EM metadata
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Structure visualization

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Assembly

Deposited unit
A: Islet amyloid polypeptide
C: Islet amyloid polypeptide
E: Islet amyloid polypeptide
G: Islet amyloid polypeptide
I: Islet amyloid polypeptide
K: Islet amyloid polypeptide
B: Islet amyloid polypeptide
D: Islet amyloid polypeptide
F: Islet amyloid polypeptide
H: Islet amyloid polypeptide
J: Islet amyloid polypeptide
L: Islet amyloid polypeptide


Theoretical massNumber of molelcules
Total (without water)46,90012
Polymers46,90012
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: microscopy
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein/peptide
Islet amyloid polypeptide / Amylin / Diabetes-associated peptide / DAP / Insulinoma amyloid peptide


Mass: 3908.319 Da / Num. of mol.: 12 / Source method: obtained synthetically / Details: TYC = C-terminal amidated Tyr / Source: (synth.) synthetic construct (others) / References: UniProt: P10997
Has ligand of interestN
Has protein modificationY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: HELICAL ARRAY / 3D reconstruction method: helical reconstruction

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Sample preparation

ComponentName: amyloid fibril of amylin (islet amyloid polipeptide) / Type: COMPLEX
Details: produced synthetically, oxidised, C-terminally amidated, fibrillated in vitro
Entity ID: all / Source: RECOMBINANT
Molecular weightValue: 1.625 kDa/nm / Experimental value: NO
Source (natural)Organism: synthetic construct (others)
Buffer solutionpH: 6.8
Buffer componentConc.: 20 mM / Name: Ammonium acetate / Formula: NH4CH3CO2
SpecimenConc.: 0.18 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: COPPER / Grid mesh size: 300 divisions/in. / Grid type: Homemade
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 95 % / Chamber temperature: 277 K

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Cs: 2.7 mm
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingAverage exposure time: 14 sec. / Electron dose: 50.07 e/Å2 / Detector mode: INTEGRATING / Film or detector model: GATAN K2 SUMMIT (4k x 4k)
EM imaging opticsEnergyfilter name: GIF Quantum LS / Energyfilter slit width: 20 eV

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Processing

EM software
IDNameVersionCategory
1RELION3particle selection
2EPU2.5.0.4799RELimage acquisition
4Gctf1.18CTF correction
11RELION3classification
13PHENIX1.17model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Helical symmertyAngular rotation/subunit: 178.23 ° / Axial rise/subunit: 2.43 Å / Axial symmetry: C1
3D reconstructionResolution: 3.6 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 32846 / Symmetry type: HELICAL

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