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- PDB-8x7l: EB-bound E46K alpha-synuclein fibrils -

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Basic information

Entry
Database: PDB / ID: 8x7l
TitleEB-bound E46K alpha-synuclein fibrils
ComponentsAlpha-synuclein
KeywordsPROTEIN FIBRIL / amyloid fibril / complex
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 / response to desipramine / positive regulation of SNARE complex assembly / positive regulation of hydrogen peroxide catabolic process / supramolecular fiber ...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 / response to desipramine / positive regulation of SNARE complex assembly / positive regulation of hydrogen peroxide catabolic process / supramolecular fiber / mitochondrial membrane organization / regulation of synaptic vesicle recycling / negative regulation of chaperone-mediated autophagy / 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 / dopamine biosynthetic process / SNARE complex assembly / regulation of norepinephrine uptake / response to iron(II) ion / positive regulation of neurotransmitter secretion / positive regulation of inositol phosphate biosynthetic process / regulation of locomotion / negative regulation of dopamine metabolic process / regulation of macrophage activation / transporter regulator activity / negative regulation of microtubule polymerization / synaptic vesicle transport / synaptic vesicle priming / dopamine uptake involved in synaptic transmission / protein kinase inhibitor activity / mitochondrial ATP synthesis coupled electron transport / regulation of dopamine secretion / dynein complex binding / positive regulation of receptor recycling / negative regulation of thrombin-activated receptor signaling pathway / cuprous ion binding / nuclear outer membrane / response to magnesium ion / positive regulation of endocytosis / positive regulation of exocytosis / synaptic vesicle exocytosis / kinesin binding / enzyme inhibitor activity / synaptic vesicle endocytosis / cysteine-type endopeptidase inhibitor activity / negative regulation of serotonin uptake / response to type II interferon / regulation of presynapse assembly / alpha-tubulin binding / beta-tubulin binding / behavioral response to cocaine / phospholipase binding / supramolecular fiber organization / phospholipid metabolic process / cellular response to fibroblast growth factor stimulus / inclusion body / axon terminus / Hsp70 protein binding / cellular response to epinephrine stimulus / response to interleukin-1 / regulation of microtubule cytoskeleton organization / cellular response to copper ion / positive regulation of release of sequestered calcium ion into cytosol / SNARE binding / adult locomotory behavior / excitatory postsynaptic potential / phosphoprotein binding / protein tetramerization / microglial cell activation / fatty acid metabolic process / ferrous iron binding / regulation of long-term neuronal synaptic plasticity / synapse organization / protein destabilization / PKR-mediated signaling / phospholipid binding / receptor internalization / tau protein binding / long-term synaptic potentiation / terminal bouton / positive regulation of inflammatory response / synaptic vesicle membrane / actin cytoskeleton / actin binding / growth cone / cellular response to oxidative stress / neuron apoptotic process / cell cortex / histone binding / response to lipopolysaccharide / microtubule binding / molecular adaptor activity / chemical synaptic transmission / amyloid fibril formation / mitochondrial outer membrane / negative regulation of neuron apoptotic process / oxidoreductase activity
Similarity search - Function
Synuclein / Alpha-synuclein / Synuclein
Similarity search - Domain/homology
Chem-IZ8 / Alpha-synuclein
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / helical reconstruction / cryo EM / Resolution: 3.4 Å
AuthorsLiu, K.E. / Tao, Y.Q. / Li, D. / Liu, C.
Funding support1items
OrganizationGrant numberCountry
Not funded
CitationJournal: Proc Natl Acad Sci U S A / Year: 2024
Title: Binding adaptability of chemical ligands to polymorphic α-synuclein amyloid fibrils.
Authors: Kaien Liu / Youqi Tao / Qinyue Zhao / Wencheng Xia / Xiang Li / Shenqing Zhang / Yuxuan Yao / Huaijiang Xiang / Chao Han / Li Tan / Bo Sun / Dan Li / Ang Li / Cong Liu /
Abstract: α-synuclein (α-syn) assembles into structurally distinct fibril polymorphs seen in different synucleinopathies, such as Parkinson's disease and multiple system atrophy. Targeting these unique ...α-synuclein (α-syn) assembles into structurally distinct fibril polymorphs seen in different synucleinopathies, such as Parkinson's disease and multiple system atrophy. Targeting these unique fibril structures using chemical ligands holds diagnostic significance for different disease subtypes. However, the molecular mechanisms governing small molecules interacting with different fibril polymorphs remain unclear. Here, we investigated the interactions of small molecules belonging to four distinct scaffolds, with different α-syn fibril polymorphs. Using cryo-electron microscopy, we determined the structures of these molecules when bound to the fibrils formed by E46K mutant α-syn and compared them to those bound with wild-type α-syn fibrils. Notably, we observed that these ligands exhibit remarkable binding adaptability, as they engage distinct binding sites across different fibril polymorphs. While the molecular scaffold primarily steered the binding locations and geometries on specific sites, the conjugated functional groups further refined this adaptable binding by fine-tuning the geometries and binding sites. Overall, our finding elucidates the adaptability of small molecules binding to different fibril structures, which sheds light on the diagnostic tracer and drug developments tailored to specific pathological fibril polymorphs.
History
DepositionNov 24, 2023Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Sep 11, 2024Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Alpha-synuclein
C: Alpha-synuclein
D: Alpha-synuclein
E: Alpha-synuclein
F: Alpha-synuclein
G: Alpha-synuclein
H: Alpha-synuclein
I: Alpha-synuclein
J: Alpha-synuclein
B: Alpha-synuclein
hetero molecules


Theoretical massNumber of molelcules
Total (without water)149,99916
Polymers144,76210
Non-polymers5,2376
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

#1: Protein
Alpha-synuclein


Mass: 14476.175 Da / Num. of mol.: 10
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: SNCA / Production host: Escherichia coli (E. coli) / References: UniProt: P37840
#2: Chemical
ChemComp-IZ8 / 4-azanyl-6-[[4-[4-[(~{E})-(8-azanyl-1-oxidanyl-5,7-disulfo-naphthalen-2-yl)diazenyl]-3-methyl-phenyl]-2-methyl-phenyl]diazenyl]-5-oxidanyl-naphthalene-1,3-disulfonic acid


Mass: 872.878 Da / Num. of mol.: 6 / Source method: obtained synthetically / Formula: C34H28N6O14S4
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: EB-bound E46K alpha-synuclein fibril / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7.5
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 BIOQUANTUM (6k x 4k)

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Processing

CTF correctionType: NONE
Helical symmertyAngular rotation/subunit: 1.60397 ° / Axial rise/subunit: 4.79952 Å / Axial symmetry: C1
3D reconstructionResolution: 3.4 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 181207 / Symmetry type: HELICAL

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