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- EMDB-3851: Near-atomic resolution fibril structure of complete amyloid-beta(... -

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Entry
Database: EMDB / ID: 3851
TitleNear-atomic resolution fibril structure of complete amyloid-beta(1-42) by cryo-EM
Map dataThe density map was sharpened by a B-factor of -50 Ang^2 and filtered to 3.5 Ang. This density map was used for model building and refinement.
SampleBeta-amyloid protein 42 fibrilsAmyloid beta:
Amyloid beta A4 protein
Function / homologyRIP-mediated NFkB activation via ZBP1 / Proteinase inhibitor I2, Kunitz, conserved site / The NLRP3 inflammasome / Amyloidogenic glycoprotein, copper-binding domain superfamily / G alpha (q) signalling events / Amyloidogenic glycoprotein, heparin-binding domain superfamily / G alpha (i) signalling events / E2 domain superfamily / Amyloid beta A4 protein / Lysosome Vesicle Biogenesis ...RIP-mediated NFkB activation via ZBP1 / Proteinase inhibitor I2, Kunitz, conserved site / The NLRP3 inflammasome / Amyloidogenic glycoprotein, copper-binding domain superfamily / G alpha (q) signalling events / Amyloidogenic glycoprotein, heparin-binding domain superfamily / G alpha (i) signalling events / E2 domain superfamily / Amyloid beta A4 protein / Lysosome Vesicle Biogenesis / Amyloidogenic glycoprotein, E2 domain / Amyloidogenic glycoprotein, intracellular domain, conserved site / Pancreatic trypsin inhibitor Kunitz domain superfamily / DEx/H-box helicases activate type I IFN and inflammatory cytokines production / Amyloidogenic glycoprotein, extracellular domain conserved site / Formyl peptide receptors bind formyl peptides and many other ligands / Beta-amyloid precursor protein C-terminal / Amyloidogenic glycoprotein, heparin-binding / TAK1 activates NFkB by phosphorylation and activation of IKKs complex / Amyloidogenic glycoprotein, amyloid-beta peptide / Pancreatic trypsin inhibitor Kunitz domain / Amyloidogenic glycoprotein, extracellular / Amyloidogenic glycoprotein / Advanced glycosylation endproduct receptor signaling / Amyloidogenic glycoprotein, amyloid-beta peptide superfamily / PH-like domain superfamily / Copper-binding of amyloid precursor, CuBD / Platelet degranulation / Regulation of Insulin-like Growth Factor (IGF) transport and uptake by Insulin-like Growth Factor Binding Proteins (IGFBPs) / Pancreatic trypsin inhibitor (Kunitz) family profile. / ECM proteoglycans / Amyloidogenic glycoprotein intracellular domain signature. / Amyloid fiber formation / Amyloidogenic glycoprotein extracellular domain signature. / Pancreatic trypsin inhibitor (Kunitz) family signature. / E2 domain of amyloid precursor protein / TRAF6 mediated NF-kB activation / Post-translational protein phosphorylation / beta-amyloid precursor protein C-terminus / Deregulated CDK5 triggers multiple neurodegenerative pathways in Alzheimer's disease models / Beta-amyloid peptide (beta-APP) / Amyloid A4 N-terminal heparin-binding / Kunitz/Bovine pancreatic trypsin inhibitor domain / Amyloidogenic glycoprotein, copper-binding / positive regulation of cellular response to tunicamycin / positive regulation of G-protein coupled receptor internalization / positive regulation of protein import / regulation of acetylcholine-gated cation channel activity / amylin binding / positive regulation of cellular response to thapsigargin / positive regulation of 1-phosphatidylinositol-3-kinase activity / heparan sulfate binding / receptor activator activity / positive regulation of response to endoplasmic reticulum stress / regulation of response to calcium ion / acetylcholine receptor activator activity / regulation of dendritic spine maintenance / endosome to plasma membrane transport vesicle / collateral sprouting in absence of injury / cellular response to norepinephrine stimulus / lipoprotein particle / positive regulation of oxidative stress-induced neuron death / synaptic growth at neuromuscular junction / microglia development / growth cone lamellipodium / regulation of synapse structure or activity / negative regulation of mitochondrion organization / mating behavior / regulation of amyloid fibril formation / astrocyte projection / smooth endoplasmic reticulum calcium ion homeostasis / protein trimerization / regulation of epidermal growth factor-activated receptor activity / growth cone filopodium / regulation of spontaneous synaptic transmission / axo-dendritic transport / cellular process / tumor necrosis factor production / axon midline choice point recognition / astrocyte activation involved in immune response / positive regulation of astrocyte activation / intermediate-density lipoprotein particle / positive regulation of amyloid fibril formation / suckling behavior / PTB domain binding / go:0030816: / modulation of excitatory postsynaptic potential / positive regulation of microglial cell activation / neuron remodeling / amyloid-beta complex / acetylcholine receptor binding / positive regulation of G-protein coupled receptor protein signaling pathway / main axon / activation of MAPKKK activity / positive regulation of amyloid-beta formation / ciliary rootlet / positive regulation of cell activation / high-density lipoprotein particle / lipoprotein metabolic process / peptidase activator activity
Function and homology information
SourceHomo sapiens (human)
Methodhelical reconstruction / cryo EM / 4 Å resolution
AuthorsGremer L / Schoelzel D
CitationJournal: Science / Year: 2017
Title: Fibril structure of amyloid-β(1-42) by cryo-electron microscopy.
Authors: Lothar Gremer / Daniel Schölzel / Carla Schenk / Elke Reinartz / Jörg Labahn / Raimond B G Ravelli / Markus Tusche / Carmen Lopez-Iglesias / Wolfgang Hoyer / Henrike Heise / Dieter Willbold / Gunnar F Schröder
Abstract: Amyloids are implicated in neurodegenerative diseases. Fibrillar aggregates of the amyloid-β protein (Aβ) are the main component of the senile plaques found in brains of Alzheimer's disease ...Amyloids are implicated in neurodegenerative diseases. Fibrillar aggregates of the amyloid-β protein (Aβ) are the main component of the senile plaques found in brains of Alzheimer's disease patients. We present the structure of an Aβ(1-42) fibril composed of two intertwined protofilaments determined by cryo-electron microscopy (cryo-EM) to 4.0-angstrom resolution, complemented by solid-state nuclear magnetic resonance experiments. The backbone of all 42 residues and nearly all side chains are well resolved in the EM density map, including the entire N terminus, which is part of the cross-β structure resulting in an overall "LS"-shaped topology of individual subunits. The dimer interface protects the hydrophobic C termini from the solvent. The characteristic staggering of the nonplanar subunits results in markedly different fibril ends, termed "groove" and "ridge," leading to different binding pathways on both fibril ends, which has implications for fibril growth.
Validation ReportPDB-ID: 5oqv

SummaryFull reportAbout validation report
DateDeposition: Aug 14, 2017 / Header (metadata) release: Sep 13, 2017 / Map release: Sep 13, 2017 / Last update: Oct 18, 2017

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.028
  • Imaged by UCSF Chimera
  • Download
  • Surface view colored by cylindrical radius
  • Surface level: 0.028
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: : PDB-5oqv
  • Surface level: 0.028
  • Imaged by UCSF Chimera
  • Download
  • Simplified surface model + fitted atomic model
  • Atomic models: PDB-5oqv
  • Imaged by Jmol
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

Downloads & links

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Map

Fileemd_3851.map.gz (map file in CCP4 format, 40311 KB)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
216 pix
0.94 Å/pix.
= 201.96 Å
216 pix
0.94 Å/pix.
= 201.96 Å
216 pix
0.94 Å/pix.
= 201.96 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.935 Å
Density
Contour Level:0.028 (by author), 0.028 (movie #1):
Minimum - Maximum-0.2759506 - 0.35235986
Average (Standard dev.)0.00003571115 (0.012035223)
Details

EMDB XML:

Space Group Number1
Map Geometry
Axis orderXYZ
Dimensions216216216
Origin-50-50-50
Limit165165165
Spacing216216216
CellA=B=C: 201.96 Å
α=β=γ: 90.0 deg.

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z0.9350.9350.935
M x/y/z216216216
origin x/y/z0.0000.0000.000
length x/y/z201.960201.960201.960
α/β/γ90.00090.00090.000
start NX/NY/NZ
NX/NY/NZ
MAP C/R/S123
start NC/NR/NS-50-50-50
NC/NR/NS216216216
D min/max/mean-0.2760.3520.000

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Supplemental data

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Sample components

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Entire Beta-amyloid protein 42 fibrils

EntireName: Beta-amyloid protein 42 fibrils / Number of components: 2

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Component #1: protein, Beta-amyloid protein 42 fibrils

ProteinName: Beta-amyloid protein 42 fibrilsAmyloid beta / Recombinant expression: No
SourceSpecies: Homo sapiens (human)
Source (engineered)Expression System: Escherichia coli (E. coli)

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Component #2: protein, Amyloid beta A4 protein

ProteinName: Amyloid beta A4 protein / Recombinant expression: No
MassTheoretical: 4.520087 kDa
Source (engineered)Expression System: Homo sapiens (human)

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Experimental details

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Sample preparation

SpecimenSpecimen state: filament / Method: cryo EM
Helical parametersAxial symmetry: C1 (asymmetric) / Delta z: 2.335 Å / Delta phi: -179.275 deg.
Sample solutionBuffer solution: in water / pH: 2
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE
Details: 2.5 microL sample was applied to the grid, blotted for 2.5 s before plunging.

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Electron microscopy imaging

Experimental equipment
Model: Talos Arctica / Image courtesy: FEI Company
ImagingMicroscope: FEI TECNAI ARCTICA
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 200 kV / Electron dose: 24 e/Å2 / Illumination mode: FLOOD BEAM
LensMagnification: 110000 X (nominal) / Cs: 2.7 mm / Imaging mode: BRIGHT FIELD
Specimen HolderModel: OTHER
CameraDetector: OTHER

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Image acquisition

Image acquisitionNumber of digital images: 2026

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Image processing

ProcessingMethod: helical reconstruction
3D reconstructionSoftware: SPARX / Resolution: 4 Å / Resolution method: FSC 0.143 CUT-OFF
Details: For the even/odd test, the fibrils were split after the final reconstruction (no gold-standard). These two half sets were then refined further independently for another 12 iterations.
FSC plot
(resolution estimation)

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Atomic model buiding

Output model

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