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- EMDB-20183: Cryo-EM structure of the N-terminally acetylated full length alph... -

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Basic information

Entry
Database: EMDB / ID: EMD-20183
TitleCryo-EM structure of the N-terminally acetylated full length alpha-synuclein fibrils (Ac1-140)
Map dataem-volume_P1.map
Sample
  • Organelle or cellular component: The N-terminally acetylated full length alpha-synuclein Ac1-140
    • Protein or peptide: Alpha-synuclein
KeywordsFull length alpha-synuclein fibrils / PROTEIN FIBRIL
Function / homology
Function and homology information


negative regulation of mitochondrial electron transport, NADH to ubiquinone / : / neutral lipid metabolic process / regulation of acyl-CoA biosynthetic process / negative regulation of dopamine uptake involved in synaptic transmission / negative regulation of norepinephrine uptake / positive regulation of SNARE complex assembly / positive regulation of hydrogen peroxide catabolic process / supramolecular fiber / mitochondrial membrane organization ...negative regulation of mitochondrial electron transport, NADH to ubiquinone / : / neutral lipid metabolic process / regulation of acyl-CoA biosynthetic process / negative regulation of dopamine uptake involved in synaptic transmission / negative regulation of norepinephrine uptake / positive regulation of SNARE complex assembly / positive regulation of hydrogen peroxide catabolic process / supramolecular fiber / mitochondrial membrane organization / negative regulation of chaperone-mediated autophagy / regulation of synaptic vesicle recycling / regulation of reactive oxygen species biosynthetic process / negative regulation of platelet-derived growth factor receptor signaling pathway / positive regulation of protein localization to cell periphery / negative regulation of exocytosis / regulation of glutamate secretion / response to iron(II) ion / SNARE complex assembly / positive regulation of neurotransmitter secretion / dopamine biosynthetic process / regulation of norepinephrine uptake / transporter regulator activity / regulation of locomotion / synaptic vesicle priming / mitochondrial ATP synthesis coupled electron transport / regulation of macrophage activation / positive regulation of inositol phosphate biosynthetic process / negative regulation of microtubule polymerization / synaptic vesicle transport / positive regulation of receptor recycling / dopamine uptake involved in synaptic transmission / protein kinase inhibitor activity / dynein complex binding / regulation of dopamine secretion / negative regulation of thrombin-activated receptor signaling pathway / cuprous ion binding / positive regulation of endocytosis / positive regulation of exocytosis / response to magnesium ion / synaptic vesicle exocytosis / enzyme inhibitor activity / kinesin binding / synaptic vesicle endocytosis / regulation of presynapse assembly / response to type II interferon / cysteine-type endopeptidase inhibitor activity / negative regulation of serotonin uptake / alpha-tubulin binding / supramolecular fiber organization / inclusion body / phospholipid metabolic process / cellular response to copper ion / axon terminus / cellular response to epinephrine stimulus / Hsp70 protein binding / response to interleukin-1 / regulation of microtubule cytoskeleton organization / SNARE binding / positive regulation of release of sequestered calcium ion into cytosol / adult locomotory behavior / negative regulation of protein kinase activity / excitatory postsynaptic potential / fatty acid metabolic process / phosphoprotein binding / protein tetramerization / microglial cell activation / regulation of long-term neuronal synaptic plasticity / synapse organization / ferrous iron binding / protein destabilization / PKR-mediated signaling / phospholipid binding / receptor internalization / tau protein binding / long-term synaptic potentiation / synaptic vesicle membrane / positive regulation of inflammatory response / actin cytoskeleton / actin binding / growth cone / cell cortex / cellular response to oxidative stress / neuron apoptotic process / chemical synaptic transmission / molecular adaptor activity / negative regulation of neuron apoptotic process / response to lipopolysaccharide / histone binding / amyloid fibril formation / lysosome / oxidoreductase activity / postsynapse / transcription cis-regulatory region binding / positive regulation of apoptotic process / Amyloid fiber formation / copper ion binding / response to xenobiotic stimulus / axon / neuronal cell body
Similarity search - Function
Synuclein / Alpha-synuclein / Synuclein
Similarity search - Domain/homology
Biological speciesHomo sapiens (human)
Methodhelical reconstruction / cryo EM / Resolution: 2.8 Å
AuthorsXiaodan N / Ryan PM
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI) United States
CitationJournal: J Mol Biol / Year: 2019
Title: Structural Insights into α-Synuclein Fibril Polymorphism: Effects of Parkinson's Disease-Related C-Terminal Truncations.
Authors: Xiaodan Ni / Ryan P McGlinchey / Jiansen Jiang / Jennifer C Lee /
Abstract: Lewy bodies, hallmarks of Parkinson's disease, contain C-terminally truncated (ΔC) α-synuclein (α-syn). Here, we report fibril structures of three N-terminally acetylated (Ac) α-syn constructs, ...Lewy bodies, hallmarks of Parkinson's disease, contain C-terminally truncated (ΔC) α-synuclein (α-syn). Here, we report fibril structures of three N-terminally acetylated (Ac) α-syn constructs, Ac1-140, Ac1-122, and Ac1-103, solved by cryoelectron microscopy. Both ΔC-α-syn variants exhibited faster aggregation kinetics, and Ac1-103 fibrils efficiently seeded the full-length protein, highlighting their importance in pathogenesis. Interestingly, fibril helical twists increased upon the removal of C-terminal residues and can be propagated through cross-seeding. Compared to that of Ac1-140, increased electron densities were seen in the N-terminus of Ac1-103, whereas the C-terminus of Ac1-122 appeared more structured. In accord, the respective termini of ΔC-α-syn exhibited increased protease resistance. Despite similar amyloid core residues, distinctive features were seen for both Ac1-122 and Ac1-103. Particularly, Ac1-103 has the tightest packed core with an additional turn, likely attributable to conformational changes in the N-terminal region. These molecular differences offer insights into the effect of C-terminal truncations on α-syn fibril polymorphism.
History
DepositionMay 1, 2019-
Header (metadata) releaseMay 22, 2019-
Map releaseSep 25, 2019-
UpdateJun 4, 2025-
Current statusJun 4, 2025Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.0328
  • Imaged by UCSF Chimera
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  • Surface view colored by cylindrical radius
  • Surface level: 0.0328
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-6osj
  • Surface level: 0.0328
  • Imaged by UCSF Chimera
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  • Simplified surface model + fitted atomic model
  • Atomic modelsPDB-6osj
  • Imaged by Jmol
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_20183.png

Downloads & links

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Map

FileDownload / File: emd_20183.map.gz / Format: CCP4 / Size: 30.5 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Annotationem-volume_P1.map
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.06 Å/pix.
x 200 pix.
= 212. Å		1.06 Å/pix.
x 200 pix.
= 212. Å		1.06 Å/pix.
x 200 pix.
= 212. Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.06 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.0328 / Movie #1: 0.0328
Minimum - Maximum-0.095500655 - 0.16429523
Average (Standard dev.)0.00018465472 (±0.008575376)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions200200200
Spacing200200200
CellA=B=C: 211.99998 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.061.061.06
M x/y/z200200200
origin x/y/z0.0000.0000.000
length x/y/z212.000212.000212.000
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS200200200
D min/max/mean-0.0960.1640.000

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Supplemental data

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Sample components

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Entire : The N-terminally acetylated full length alpha-synuclein Ac1-140

EntireName: The N-terminally acetylated full length alpha-synuclein Ac1-140
Components
  • Organelle or cellular component: The N-terminally acetylated full length alpha-synuclein Ac1-140
    • Protein or peptide: Alpha-synuclein

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Supramolecule #1: The N-terminally acetylated full length alpha-synuclein Ac1-140

SupramoleculeName: The N-terminally acetylated full length alpha-synuclein Ac1-140
type: organelle_or_cellular_component / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: Alpha-synuclein

MacromoleculeName: Alpha-synuclein / type: protein_or_peptide / ID: 1 / Number of copies: 10 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 14.476108 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
MDVFMKGLSK AKEGVVAAAE KTKQGVAEAA GKTKEGVLYV GSKTKEGVVH GVATVAEKTK EQVTNVGGAV VTGVTAVAQK TVEGAGSIA AATGFVKKDQ LGKNEEGAPQ EGILEDMPVD PDNEAYEMPS EEGYQDYEPE A

UniProtKB: Alpha-synuclein

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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

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: SUPER-RESOLUTION / Average electron dose: 1.3 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Final reconstructionApplied symmetry - Helical parameters - Δz: 2.4 Å
Applied symmetry - Helical parameters - Δ&Phi: 179.643 °
Applied symmetry - Helical parameters - Axial symmetry: C1 (asymmetric)
Resolution.type: BY AUTHOR / Resolution: 2.8 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 12132
CTF correctionType: PHASE FLIPPING ONLY
Startup modelType of model: NONE
Final angle assignmentType: NOT APPLICABLE
FSC plot (resolution estimation)

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