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- PDB-8vo8: Cryo-EM structure of fascin crosslinked F-actin (Eigen_left) -

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Basic information

Entry
Database: PDB / ID: 8vo8
TitleCryo-EM structure of fascin crosslinked F-actin (Eigen_left)
Components
  • Actin, alpha skeletal muscle
  • Fascin
KeywordsSTRUCTURAL PROTEIN / Cytoskeleton / F-actin crosslinker / F-actin bundle
Function / homology
Function and homology information


microspike / parallel actin filament bundle assembly / regulation of microvillus assembly / positive regulation of extracellular matrix disassembly / establishment of apical/basal cell polarity / Striated Muscle Contraction / microspike assembly / cell projection membrane / cell-cell junction assembly / positive regulation of podosome assembly ...microspike / parallel actin filament bundle assembly / regulation of microvillus assembly / positive regulation of extracellular matrix disassembly / establishment of apical/basal cell polarity / Striated Muscle Contraction / microspike assembly / cell projection membrane / cell-cell junction assembly / positive regulation of podosome assembly / podosome / positive regulation of filopodium assembly / establishment or maintenance of cell polarity / microvillus / actin filament bundle assembly / striated muscle thin filament / skeletal muscle thin filament assembly / stress fiber / skeletal muscle fiber development / positive regulation of lamellipodium assembly / ruffle / filopodium / actin filament / regulation of actin cytoskeleton organization / cell motility / Hydrolases; Acting on acid anhydrides; Acting on acid anhydrides to facilitate cellular and subcellular movement / actin filament binding / cell-cell junction / cell migration / lamellipodium / actin cytoskeleton / actin binding / actin cytoskeleton organization / growth cone / cell cortex / protein-macromolecule adaptor activity / Interleukin-4 and Interleukin-13 signaling / cytoskeleton / hydrolase activity / cadherin binding / RNA binding / extracellular exosome / ATP binding / cytosol / cytoplasm
Similarity search - Function
Fascin / Fascin, metazoans / Fascin domain / Fascin domain / Actin-crosslinking / Actins signature 1. / Actin, conserved site / Actins signature 2. / Actin/actin-like conserved site / Actins and actin-related proteins signature. ...Fascin / Fascin, metazoans / Fascin domain / Fascin domain / Actin-crosslinking / Actins signature 1. / Actin, conserved site / Actins signature 2. / Actin/actin-like conserved site / Actins and actin-related proteins signature. / Actin / Actin family / Actin / ATPase, nucleotide binding domain
Similarity search - Domain/homology
ADENOSINE-5'-DIPHOSPHATE / Actin, alpha skeletal muscle / Fascin
Similarity search - Component
Biological speciesHomo sapiens (human)
Gallus gallus (chicken)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.9 Å
AuthorsGong, R. / Reynolds, M.J. / Alushin, G.M.
Funding support United States, 2items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R01GM141044 United States
Other privateG-2020-14047
CitationJournal: Nat Struct Mol Biol / Year: 2025
Title: Fascin structural plasticity mediates flexible actin bundle construction.
Authors: Rui Gong / Matthew J Reynolds / Keith R Carney / Keith Hamilton / Tamara C Bidone / Gregory M Alushin /
Abstract: Fascin cross-links actin filaments (F-actin) into bundles that support tubular membrane protrusions including filopodia and stereocilia. Fascin dysregulation drives aberrant cell migration during ...Fascin cross-links actin filaments (F-actin) into bundles that support tubular membrane protrusions including filopodia and stereocilia. Fascin dysregulation drives aberrant cell migration during metastasis, and fascin inhibitors are under development as cancer therapeutics. Here, we use cryo-EM, cryo-electron tomography coupled with custom denoising and computational modeling to probe human fascin-1's F-actin cross-linking mechanisms across spatial scales. Our fascin cross-bridge structure reveals an asymmetric F-actin binding conformation that is allosterically blocked by the inhibitor G2. Reconstructions of seven-filament hexagonal bundle elements, variability analysis and simulations show how structural plasticity enables fascin to bridge varied interfilament orientations, accommodating mismatches between F-actin's helical symmetry and bundle hexagonal packing. Tomography of many-filament bundles and modeling uncover geometric rules underlying emergent fascin binding patterns, as well as the accumulation of unfavorable cross-links that limit bundle size. Collectively, this work shows how fascin harnesses fine-tuned nanoscale structural dynamics to build and regulate micron-scale F-actin bundles.
History
DepositionJan 14, 2024Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jan 15, 2025Provider: repository / Type: Initial release
Revision 1.1Feb 5, 2025Group: Data collection / Database references / Category: citation / citation_author / em_admin
Item: _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed ..._citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _em_admin.last_update
Revision 1.2May 28, 2025Group: Data collection / Database references / Category: citation / em_admin
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _em_admin.last_update

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Fascin
B: Actin, alpha skeletal muscle
C: Actin, alpha skeletal muscle
D: Actin, alpha skeletal muscle
E: Actin, alpha skeletal muscle
F: Actin, alpha skeletal muscle
G: Actin, alpha skeletal muscle
hetero molecules


Theoretical massNumber of molelcules
Total (without water)307,51119
Polymers304,8027
Non-polymers2,70912
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 Fascin / 55 kDa actin-bundling protein / Singed-like protein / p55


Mass: 55013.328 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: FSCN1, FAN1, HSN, SNL / Production host: Escherichia coli (E. coli) / References: UniProt: Q16658
#2: Protein
Actin, alpha skeletal muscle / Alpha-actin-1


Mass: 41631.430 Da / Num. of mol.: 6 / Source method: isolated from a natural source / Source: (natural) Gallus gallus (chicken) / References: UniProt: P68139
#3: Chemical
ChemComp-ADP / ADENOSINE-5'-DIPHOSPHATE


Mass: 427.201 Da / Num. of mol.: 6 / Source method: obtained synthetically / Formula: C10H15N5O10P2 / Feature type: SUBJECT OF INVESTIGATION / Comment: ADP, energy-carrying molecule*YM
#4: Chemical
ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 6 / Source method: obtained synthetically / Formula: Mg / Feature type: SUBJECT OF INVESTIGATION
Has ligand of interestY
Has protein modificationY

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Experimental details

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Experiment

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

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Sample preparation

ComponentName: Fascin crosslinked F-actin / Type: COMPLEX / Entity ID: #1-#2 / Source: RECOMBINANT
Molecular weightValue: 5.4 kDa/nm / Experimental value: YES
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 8
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: 2800 nm / Nominal defocus min: 800 nm
Image recordingElectron dose: 61.26 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.9 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 17271 / Symmetry type: POINT

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