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- EMDB-53093: Cryo-EM structure of the undecorated actin filament in the ADP-Pi... -

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Entry
Database: EMDB / ID: EMD-53093
TitleCryo-EM structure of the undecorated actin filament in the ADP-Pi state.
Map dataMain, sharpened cryo-EM density map of the undecorated actin filament in the ADP-Pi state without bound Coronin-1B.
Sample
  • Complex: Beta-actin filament.
    • Protein or peptide: Actin, cytoplasmic 1, N-terminally processed
  • Ligand: ADENOSINE-5'-DIPHOSPHATE
  • Ligand: MAGNESIUM ION
  • Ligand: PHOSPHATE ION
  • Ligand: water
Keywordsactin / filament / cytoskeleton / STRUCTURAL PROTEIN
Function / homology
Function and homology information


positive regulation of norepinephrine uptake / bBAF complex / GBAF complex / brahma complex / cellular response to cytochalasin B / Formation of the embryonic stem cell BAF (esBAF) complex / npBAF complex / nBAF complex / regulation of transepithelial transport / Formation of the canonical BAF (cBAF) complex ...positive regulation of norepinephrine uptake / bBAF complex / GBAF complex / brahma complex / cellular response to cytochalasin B / Formation of the embryonic stem cell BAF (esBAF) complex / npBAF complex / nBAF complex / regulation of transepithelial transport / Formation of the canonical BAF (cBAF) complex / morphogenesis of a polarized epithelium / Formation of annular gap junctions / Formation of the dystrophin-glycoprotein complex (DGC) / structural constituent of postsynaptic actin cytoskeleton / Formation of the polybromo-BAF (pBAF) complex / Gap junction degradation / protein localization to adherens junction / Formation of neuronal progenitor and neuronal BAF (npBAF and nBAF) / Formation of the non-canonical BAF (ncBAF) complex / Cell-extracellular matrix interactions / regulation of G0 to G1 transition / dense body / RSC-type complex / Folding of actin by CCT/TriC / Tat protein binding / postsynaptic actin cytoskeleton / Regulation of CDH1 Function / apical protein localization / regulation of double-strand break repair / Prefoldin mediated transfer of substrate to CCT/TriC / Adherens junctions interactions / adherens junction assembly / RHOF GTPase cycle / regulation of nucleotide-excision repair / Sensory processing of sound by outer hair cells of the cochlea / tight junction / SWI/SNF complex / Sensory processing of sound by inner hair cells of the cochlea / regulation of mitotic metaphase/anaphase transition / Interaction between L1 and Ankyrins / positive regulation of T cell differentiation / apical junction complex / maintenance of blood-brain barrier / positive regulation of stem cell population maintenance / NuA4 histone acetyltransferase complex / regulation of norepinephrine uptake / transporter regulator activity / positive regulation of double-strand break repair / Recycling pathway of L1 / cortical cytoskeleton / Regulation of MITF-M-dependent genes involved in pigmentation / establishment or maintenance of cell polarity / nitric-oxide synthase binding / brush border / EPH-ephrin mediated repulsion of cells / regulation of synaptic vesicle endocytosis / negative regulation of cell differentiation / positive regulation of myoblast differentiation / RHO GTPases Activate WASPs and WAVEs / kinesin binding / regulation of protein localization to plasma membrane / RHO GTPases activate IQGAPs / positive regulation of double-strand break repair via homologous recombination / regulation of G1/S transition of mitotic cell cycle / axonogenesis / cytoskeleton organization / EPHB-mediated forward signaling / substantia nigra development / calyx of Held / nitric-oxide synthase regulator activity / FCGR3A-mediated phagocytosis / cell motility / Translocation of SLC2A4 (GLUT4) to the plasma membrane / actin filament / adherens junction / positive regulation of cell differentiation / Regulation of endogenous retroelements by Piwi-interacting RNAs (piRNAs) / RHO GTPases Activate Formins / Signaling by high-kinase activity BRAF mutants / MAP2K and MAPK activation / Regulation of actin dynamics for phagocytic cup formation / platelet aggregation / VEGFA-VEGFR2 Pathway / B-WICH complex positively regulates rRNA expression / Hydrolases; Acting on acid anhydrides; Acting on acid anhydrides to facilitate cellular and subcellular movement / tau protein binding / DNA Damage Recognition in GG-NER / Schaffer collateral - CA1 synapse / structural constituent of cytoskeleton / kinetochore / nuclear matrix / cytoplasmic ribonucleoprotein granule / Signaling by RAF1 mutants / cell-cell junction / Signaling by moderate kinase activity BRAF mutants / Paradoxical activation of RAF signaling by kinase inactive BRAF / Signaling downstream of RAS mutants / Signaling by BRAF and RAF1 fusions / actin cytoskeleton / nucleosome
Similarity search - Function
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
Actin, cytoplasmic 1
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.18 Å
AuthorsOosterheert W / Boiero Sanders M / Hofnagel O / Bieling P / Raunser S
Funding support Germany, European Union, 4 items
OrganizationGrant numberCountry
Max Planck Society Germany
Alexander von Humboldt Foundation Germany
German Research Foundation (DFG)BI 1998/2-1 Germany
European Research Council (ERC)856118European Union
CitationJournal: Cell / Year: 2025
Title: Choreography of rapid actin filament disassembly by coronin, cofilin, and AIP1.
Authors: Wout Oosterheert / Micaela Boiero Sanders / Oliver Hofnagel / Peter Bieling / Stefan Raunser /
Abstract: Rapid remodeling of actin filament (F-actin) networks is essential for the movement and morphogenesis of eukaryotic cells. The conserved actin-binding proteins coronin, cofilin, and actin-interacting ...Rapid remodeling of actin filament (F-actin) networks is essential for the movement and morphogenesis of eukaryotic cells. The conserved actin-binding proteins coronin, cofilin, and actin-interacting protein 1 (AIP1) act in synergy to promote rapid F-actin network disassembly, but the underlying mechanisms have remained elusive. Here, using cryo-electron microscopy (cryo-EM), we uncover the concerted molecular actions of coronin, cofilin, and AIP1 that lead to actin filament aging and severing. We find that the cooperative binding of coronin allosterically promotes inorganic phosphate release from F-actin and induces filament undertwisting, thereby priming the filament for cofilin binding. Cofilin then displaces coronin from the filament via a strand-restricted cooperative binding mechanism. The resulting cofilactin serves as a high-affinity platform for AIP1, which induces severing by acting as a clamp that disrupts inter-subunit filament contacts. In this "molecular squeezing" mechanism, AIP1 and not cofilin is responsible for filament severing. Our work redefines the role of key disassembly factors in actin dynamics.
History
DepositionMar 11, 2025-
Header (metadata) releaseOct 8, 2025-
Map releaseOct 8, 2025-
UpdateDec 10, 2025-
Current statusDec 10, 2025Processing site: PDBe / Status: Released

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Structure visualization

Supplemental images

emd_53093.png

Downloads & links

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Map

FileDownload / File: emd_53093.map.gz / Format: CCP4 / Size: 216 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationMain, sharpened cryo-EM density map of the undecorated actin filament in the ADP-Pi state without bound Coronin-1B.
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.68 Å/pix.
x 384 pix.
= 261.12 Å		0.68 Å/pix.
x 384 pix.
= 261.12 Å		0.68 Å/pix.
x 384 pix.
= 261.12 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.68 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.065
Minimum - Maximum-0.24981457 - 0.64955014
Average (Standard dev.)0.00052062684 (±0.013456269)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions384384384
Spacing384384384
CellA=B=C: 261.12 Å
α=β=γ: 90.0 °

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Supplemental data

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Mask #1

Fileemd_53093_msk_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Additional map: Unsharpened cryo-EM density map of the undecorated actin...

Fileemd_53093_additional_1.map
AnnotationUnsharpened cryo-EM density map of the undecorated actin filament in the ADP-Pi state without bound Coronin-1B.
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Half map B of the undecorated actin filament...

Fileemd_53093_half_map_1.map
AnnotationHalf map B of the undecorated actin filament in the ADP-Pi state without bound Coronin-1B.
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Half map A of the undecorated actin filament...

Fileemd_53093_half_map_2.map
AnnotationHalf map A of the undecorated actin filament in the ADP-Pi state without bound Coronin-1B.
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Beta-actin filament.

EntireName: Beta-actin filament.
Components
  • Complex: Beta-actin filament.
    • Protein or peptide: Actin, cytoplasmic 1, N-terminally processed
  • Ligand: ADENOSINE-5'-DIPHOSPHATE
  • Ligand: MAGNESIUM ION
  • Ligand: PHOSPHATE ION
  • Ligand: water

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Supramolecule #1: Beta-actin filament.

SupramoleculeName: Beta-actin filament. / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1
Details: The filament is double stranded and consists of beta-actin subunits.
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: Actin, cytoplasmic 1, N-terminally processed

MacromoleculeName: Actin, cytoplasmic 1, N-terminally processed / type: protein_or_peptide / ID: 1 / Details: Filament / Number of copies: 5 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 41.632422 KDa
Recombinant expressionOrganism: Trichoplusia ni (cabbage looper)
SequenceString: DDDIAALVVD NGSGMCKAGF AGDDAPRAVF PSIVGRPRHQ GVMVGMGQKD SYVGDEAQSK RGILTLKYPI E(HIC)GIVT NWD DMEKIWHHTF YNELRVAPEE HPVLLTEAPL NPKANREKMT QIMFETFNTP AMYVAIQAVL SLYASGRTTG IVMDSGD GV THTVPIYEGY ...String:
DDDIAALVVD NGSGMCKAGF AGDDAPRAVF PSIVGRPRHQ GVMVGMGQKD SYVGDEAQSK RGILTLKYPI E(HIC)GIVT NWD DMEKIWHHTF YNELRVAPEE HPVLLTEAPL NPKANREKMT QIMFETFNTP AMYVAIQAVL SLYASGRTTG IVMDSGD GV THTVPIYEGY ALPHAILRLD LAGRDLTDYL MKILTERGYS FTTTAEREIV RDIKEKLCYV ALDFEQEMAT AASSSSLE K SYELPDGQVI TIGNERFRCP EALFQPSFLG MESAGIHETT FNSIMKCDVD IRKDLYANTV LSGGTTMYPG IADRMQKEI TALAPSTMKI KIIAPPERKY SVWIGGSILA SLSTFQQMWI SKQEYDESGP SIVHRKCF

UniProtKB: Actin, cytoplasmic 1

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Macromolecule #2: ADENOSINE-5'-DIPHOSPHATE

MacromoleculeName: ADENOSINE-5'-DIPHOSPHATE / type: ligand / ID: 2 / Number of copies: 5 / Formula: ADP
Molecular weightTheoretical: 427.201 Da
Chemical component information

ChemComp-ADP:
ADENOSINE-5'-DIPHOSPHATE / ADP, energy-carrying molecule*YM

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Macromolecule #3: MAGNESIUM ION

MacromoleculeName: MAGNESIUM ION / type: ligand / ID: 3 / Number of copies: 5 / Formula: MG
Molecular weightTheoretical: 24.305 Da

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Macromolecule #4: PHOSPHATE ION

MacromoleculeName: PHOSPHATE ION / type: ligand / ID: 4 / Number of copies: 5 / Formula: PO4
Molecular weightTheoretical: 94.971 Da
Chemical component information

ChemComp-PO4:
PHOSPHATE ION

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Macromolecule #5: water

MacromoleculeName: water / type: ligand / ID: 5 / Number of copies: 690 / Formula: HOH
Molecular weightTheoretical: 18.015 Da
Chemical component information

ChemComp-HOH:
WATER

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation statefilament

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Sample preparation

BufferpH: 7.1
Component:
ConcentrationNameFormula
10.0 mMHEPES
100.0 mMpotassium chlorideKCl
2.0 mMmagnesium chlorideMgCl2
1.0 mMEGTA
0.5 mMTCEP
0.01 % (v/v)Tween20

Details: 1xKMEH (10 mM HEPES pH 7.1, 100 mM KCl, 2 mM MgCl2, 1 mM EGTA, 0.5 mM TCEP, 0.01% Tween20).
GridModel: Quantifoil R2/1 / Material: GOLD / Mesh: 200 / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 90 sec.
VitrificationCryogen name: ETHANE-PROPANE / Chamber humidity: 100 % / Chamber temperature: 286 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeTFS KRIOS
Specialist opticsSpherical aberration corrector: The used Titan Krios G2 microscope contains an in-column Cs corrector.
Energy filter - Name: GIF Bioquantum / Energy filter - Slit width: 15 eV
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Number grids imaged: 1 / Number real images: 21841 / Average electron dose: 68.4 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 50.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 0.01 mm / Nominal defocus max: 2.7 µm / Nominal defocus min: 1.2 µm / Nominal magnification: 105000
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 9946495
CTF correctionSoftware - Name: cryoSPARC (ver. 4.4) / Software - details: Patch CTF / Details: Patch CTF / Type: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: EMDB MAP
EMDB ID:

16888

Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 2.18 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC (ver. 4.4) / Software - details: Local Refinement / Number images used: 4674353
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC (ver. 4.4) / Details: CryoSPARC
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC (ver. 4.4)
Final 3D classificationSoftware - Name: cryoSPARC (ver. 4.4)
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial modelPDB ID:

8oi8


Chain - Source name: PDB / Chain - Initial model type: experimental model
DetailsPhenix real space refinement.
RefinementSpace: REAL / Protocol: FLEXIBLE FIT
Output model

PDB-9qew:
Cryo-EM structure of the undecorated actin filament in the ADP-Pi state.

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