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- PDB-7yk8: Cryo-EM structure of dLAG3-alpha-syn fibril -

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Basic information

Entry
Database: PDB / ID: 7yk8
TitleCryo-EM structure of dLAG3-alpha-syn fibril
ComponentsAlpha-synuclein
KeywordsPROTEIN FIBRIL / amyloid
Function / homology
Function and homology information


negative regulation of mitochondrial electron transport, NADH to ubiquinone / negative regulation of dopamine uptake involved in synaptic transmission / negative regulation of norepinephrine uptake / response to desipramine / positive regulation of SNARE complex assembly / positive regulation of hydrogen peroxide catabolic process / supramolecular fiber / regulation of synaptic vesicle recycling / negative regulation of chaperone-mediated autophagy / regulation of reactive oxygen species biosynthetic process ...negative regulation of mitochondrial electron transport, NADH to ubiquinone / negative regulation of dopamine uptake involved in synaptic transmission / negative regulation of norepinephrine uptake / response to desipramine / positive regulation of SNARE complex assembly / positive regulation of hydrogen peroxide catabolic process / supramolecular fiber / regulation of synaptic vesicle recycling / negative regulation of chaperone-mediated autophagy / regulation of reactive oxygen species biosynthetic process / positive regulation of protein localization to cell periphery / negative regulation of exocytosis / dopamine biosynthetic process / dopamine uptake involved in synaptic transmission / negative regulation of dopamine metabolic process / response to iron(II) ion / negative regulation of platelet-derived growth factor receptor signaling pathway / SNARE complex assembly / negative regulation of thrombin-activated receptor signaling pathway / negative regulation of microtubule polymerization / synaptic vesicle priming / Lewy body / synaptic vesicle transport / regulation of norepinephrine uptake / synaptic vesicle exocytosis / transporter regulator activity / positive regulation of inositol phosphate biosynthetic process / protein kinase inhibitor activity / regulation of dopamine secretion / positive regulation of receptor recycling / cuprous ion binding / positive regulation of exocytosis / nuclear outer membrane / dynein complex binding / synaptic transmission, dopaminergic / response to magnesium ion / positive regulation of endocytosis / negative regulation of serotonin uptake / cysteine-type endopeptidase inhibitor activity / kinesin binding / regulation of presynapse assembly / synaptic vesicle endocytosis / alpha-tubulin binding / beta-tubulin binding / behavioral response to cocaine / phospholipase binding / cellular response to fibroblast growth factor stimulus / supramolecular fiber organization / response to type II interferon / cellular response to epinephrine stimulus / inclusion body / response to interleukin-1 / Hsp70 protein binding / positive regulation of release of sequestered calcium ion into cytosol / cellular response to copper ion / axon terminus / enzyme inhibitor activity / glutathione metabolic process / SNARE binding / protein tetramerization / protein sequestering activity / regulation of microtubule cytoskeleton organization / receptor internalization / phosphoprotein binding / microglial cell activation / protein destabilization / tubulin binding / ferrous iron binding / synapse organization / phospholipid binding / PKR-mediated signaling / tau protein binding / enzyme activator activity / positive regulation of inflammatory response / terminal bouton / actin cytoskeleton / synaptic vesicle membrane / negative regulation of neuron apoptotic process / response to lipopolysaccharide / growth cone / actin binding / cellular response to oxidative stress / cell cortex / histone binding / microtubule binding / amyloid fibril formation / mitochondrial outer membrane / lysosome / oxidoreductase activity / mitochondrial inner membrane / transcription cis-regulatory region binding / positive regulation of apoptotic process / ribosome / mitochondrial matrix / Amyloid fiber formation / copper ion binding / protein domain specific binding / axon / neuronal cell body / calcium ion binding
Similarity search - Function
Synuclein / Alpha-synuclein / Synuclein
Similarity search - Domain/homology
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / helical reconstruction / cryo EM / Resolution: 2.8 Å
AuthorsXu, Q.H. / Xia, W.C. / Tao, Y.Q. / Liu, C.
Funding support1items
OrganizationGrant numberCountry
Not funded
CitationJournal: J Am Chem Soc / Year: 2023
Title: Conformational Dynamics of an α-Synuclein Fibril upon Receptor Binding Revealed by Insensitive Nuclei Enhanced by Polarization Transfer-Based Solid-State Nuclear Magnetic Resonance and Cryo-Electron Microscopy.
Authors: Shengnan Zhang / Juan Li / Qianhui Xu / Wencheng Xia / Youqi Tao / Chaowei Shi / Dan Li / ShengQi Xiang / Cong Liu /
Abstract: Many amyloid fibrils associated with neurodegenerative diseases consist of an ordered fibril core (FC) and disordered terminal regions (TRs). The former represents a stable scaffold, while the latter ...Many amyloid fibrils associated with neurodegenerative diseases consist of an ordered fibril core (FC) and disordered terminal regions (TRs). The former represents a stable scaffold, while the latter is rather active in binding with various partners. Current structural studies mainly focus on the ordered FC since the high flexibility of TRs hinders structural characterization. Here, by combining insensitive nuclei enhanced by polarization transfer-based H-detected solid-state NMR and cryo-EM, we explored the intact structure of an α-syn fibril including both FC and TRs and further studied the conformational dynamics of the fibril upon binding to lymphocyte activation gene 3 (LAG3)─a cell surface receptor that is involved in α-syn fibril transmission in brains. We found that both the N- and C-TRs of α-syn are disordered in free fibrils featuring similar conformation ensembles as those in soluble monomers. While in the presence of the D1 domain of LAG3 (L3D1), the C-TR directly binds to L3D1, meanwhile the N-TR folds into a β-strand and further integrates with the FC, which leads to alteration of the overall fibril structure and surface property. Our work reveals synergistic conformational transition of the intrinsically disordered TRs of α-syn, which sheds light on mechanistic understanding of the essential role of TRs in regulating the structure and pathology of amyloid fibrils.
History
DepositionJul 22, 2022Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Mar 22, 2023Provider: repository / Type: Initial release
Revision 1.1May 8, 2024Group: Data collection / Database references / Category: chem_comp_atom / chem_comp_bond / citation / Item: _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
L: Alpha-synuclein
I: Alpha-synuclein
B: Alpha-synuclein
A: Alpha-synuclein
J: Alpha-synuclein
G: Alpha-synuclein
E: Alpha-synuclein
C: Alpha-synuclein
K: Alpha-synuclein
H: Alpha-synuclein
F: Alpha-synuclein
D: Alpha-synuclein


Theoretical massNumber of molelcules
Total (without water)173,71312
Polymers173,71312
Non-polymers00
Water00
1


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

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Components

#1: Protein
Alpha-synuclein / Non-A beta component of AD amyloid / Non-A4 component of amyloid precursor / NACP


Mass: 14476.108 Da / Num. of mol.: 12
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: SNCA, NACP, PARK1 / Production host: Escherichia coli K-12 (bacteria) / Strain (production host): K-12 / References: UniProt: P37840

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Experimental details

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Experiment

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

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Sample preparation

ComponentName: Cryo-EM structure of dLAG3-alpha-syn fibril / Type: ORGANELLE OR CELLULAR COMPONENT / Entity ID: all / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Escherichia coli K-12 (bacteria)
Buffer solutionpH: 7.4
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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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: 2000 nm / Nominal defocus min: 1000 nm
Image recordingElectron dose: 55 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

CTF correctionType: NONE
Helical symmertyAngular rotation/subunit: 179.604 ° / Axial rise/subunit: 2.424 Å / Axial symmetry: C1
3D reconstructionResolution: 2.8 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 82205 / Symmetry type: HELICAL

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