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- PDB-7yl7: Structure of hIAPP-TF-type3 -

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Basic information

Entry
Database: PDB / ID: 7yl7
TitleStructure of hIAPP-TF-type3
ComponentsIslet amyloid polypeptide
KeywordsPROTEIN FIBRIL / hIAPP / amylin
Function / homology
Function and homology information


amylin receptor signaling pathway / Calcitonin-like ligand receptors / negative regulation of amyloid fibril formation / negative regulation of bone resorption / eating behavior / positive regulation of protein kinase A signaling / negative regulation of osteoclast differentiation / Regulation of gene expression in beta cells / negative regulation of protein-containing complex assembly / bone resorption ...amylin receptor signaling pathway / Calcitonin-like ligand receptors / negative regulation of amyloid fibril formation / negative regulation of bone resorption / eating behavior / positive regulation of protein kinase A signaling / negative regulation of osteoclast differentiation / Regulation of gene expression in beta cells / negative regulation of protein-containing complex assembly / bone resorption / 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 / receptor ligand activity / positive regulation of apoptotic process / Amyloid fiber formation / signaling receptor binding / lipid binding / apoptotic process / 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 speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / helical reconstruction / Resolution: 3.3 Å
AuthorsLi, D. / Zhang, X.
Funding support China, 3items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)2017YFA0504700 China
National Natural Science Foundation of China (NSFC)2018YFE0203300 China
National Natural Science Foundation of China (NSFC)2021YFA1300100 China
CitationJournal: iScience / Year: 2022
Title: A new polymorphism of human amylin fibrils with similar protofilaments and a conserved core.
Authors: Dongyu Li / Xueli Zhang / Youwang Wang / Haonan Zhang / Kai Song / Keyan Bao / Ping Zhu /
Abstract: Pancreatic amyloid deposits composed of a fibrillar form of the human islet amyloid polypeptide (hIAPP) are the pathological hallmark of type 2 diabetes (T2D). Although various cryo-EM structures of ...Pancreatic amyloid deposits composed of a fibrillar form of the human islet amyloid polypeptide (hIAPP) are the pathological hallmark of type 2 diabetes (T2D). Although various cryo-EM structures of polymorphic hIAPP fibrils were reported, the underlying polymorphic mechanism of hIAPP remains elusive. Meanwhile, the structure of hIAPP fibrils with all residues visible in the fibril core is not available. Here, we report the full-length structures of two different polymorphs of hIAPP fibrils, namely slim form (SF, dimer) and thick form (TF, tetramer), formed in a salt-free environment, which share a similar ζ-shaped protofilament but differ in inter-protofilament interfaces. In the absence of salt, electrostatic interactions were found to play a dominant role in stabilizing the fibril structure, suggesting an antagonistic effect between electrostatic and hydrophobic interactions in different salt concentrations environments. Our results shed light on understanding the mechanism of amyloid fibril polymorphism.
History
DepositionJul 25, 2022Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Dec 28, 2022Provider: repository / Type: Initial release
Revision 1.1May 8, 2024Group: Data collection / Database references / Category: chem_comp_atom / chem_comp_bond / citation
Item: _citation.page_last / _citation.pdbx_database_id_PubMed / _citation.title

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
F: Islet amyloid polypeptide
A: Islet amyloid polypeptide
B: Islet amyloid polypeptide
K: Islet amyloid polypeptide
C: Islet amyloid polypeptide
G: Islet amyloid polypeptide
L: Islet amyloid polypeptide
D: Islet amyloid polypeptide
H: Islet amyloid polypeptide
J: Islet amyloid polypeptide
E: Islet amyloid polypeptide
I: 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: electron 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 / Source: (synth.) Homo sapiens (human) / References: UniProt: P10997
Has ligand of interestN

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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: no / Type: ORGANELLE OR CELLULAR COMPONENT / Entity ID: all / Source: SYNTHETIC
Source (natural)Organism: Homo sapiens (human)
Buffer solutionpH: 7
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: NO

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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 / Nominal defocus max: 1500 nm / Nominal defocus min: 1000 nm / Cs: 2.8 mm
Image recordingAverage exposure time: 3 sec. / Electron dose: 60 e/Å2 / Detector mode: SUPER-RESOLUTION / Film or detector model: GATAN K2 SUMMIT (4k x 4k)
Image scansMovie frames/image: 32

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Processing

SoftwareName: PHENIX / Version: 1.19.2_4158: / Classification: refinement
EM software
IDNameVersionCategory
11RELION3final Euler assignment
13RELION33D reconstruction
CTF correctionType: NONE
Helical symmertyAngular rotation/subunit: 179.41 ° / Axial rise/subunit: 2.35 Å / Axial symmetry: C1
3D reconstructionResolution: 3.3 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 29587 / Symmetry type: HELICAL
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0043024
ELECTRON MICROSCOPYf_angle_d0.524110
ELECTRON MICROSCOPYf_dihedral_angle_d5.181414
ELECTRON MICROSCOPYf_chiral_restr0.044498
ELECTRON MICROSCOPYf_plane_restr0.002540

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