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- EMDB-72711: Capping protein bound to the barbed end of cofilactin -

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Basic information

Entry
Database: EMDB / ID: EMD-72711
TitleCapping protein bound to the barbed end of cofilactin
Map data
Sample
  • Complex: Complex of the Cyclase Associated Protein-1 bound to F-actin
    • Complex: Actin, alpha skeletal muscle
      • Protein or peptide: Actin, alpha skeletal muscle
    • Complex: Cofilin-2
      • Protein or peptide: Cofilin-2
    • Complex: Capping Protein
      • Protein or peptide: F-actin-capping protein subunit alpha-1
      • Protein or peptide: F-actin-capping protein subunit beta
  • Ligand: ADENOSINE-5'-DIPHOSPHATE
  • Ligand: MAGNESIUM ION
KeywordsCytoskeleton / Actin / Filament / Helical / PROTEIN FIBRIL
Function / homology
Function and homology information


actin filament fragmentation / F-actin capping protein complex / WASH complex / positive regulation of actin filament depolymerization / sperm head-tail coupling apparatus / actin filament severing / cell junction assembly / barbed-end actin filament capping / actin polymerization or depolymerization / actin filament depolymerization ...actin filament fragmentation / F-actin capping protein complex / WASH complex / positive regulation of actin filament depolymerization / sperm head-tail coupling apparatus / actin filament severing / cell junction assembly / barbed-end actin filament capping / actin polymerization or depolymerization / actin filament depolymerization / RHOD GTPase cycle / regulation of cell morphogenesis / RHOF GTPase cycle / COPI-independent Golgi-to-ER retrograde traffic / I band / Sensory processing of sound by inner hair cells of the cochlea / lamellipodium assembly / sarcomere organization / cytoskeletal motor activator activity / muscle cell cellular homeostasis / myosin heavy chain binding / tropomyosin binding / actin filament bundle / troponin I binding / filamentous actin / cortical cytoskeleton / mesenchyme migration / skeletal muscle myofibril / brush border / Advanced glycosylation endproduct receptor signaling / actin filament bundle assembly / striated muscle thin filament / skeletal muscle thin filament assembly / actin monomer binding / skeletal muscle tissue development / COPI-mediated anterograde transport / skeletal muscle fiber development / stress fiber / titin binding / actin filament polymerization / cytoskeleton organization / MHC class II antigen presentation / Gene and protein expression by JAK-STAT signaling after Interleukin-12 stimulation / HSP90 chaperone cycle for steroid hormone receptors (SHR) in the presence of ligand / sarcomere / hippocampal mossy fiber to CA3 synapse / actin filament / filopodium / Hydrolases; Acting on acid anhydrides; Acting on acid anhydrides to facilitate cellular and subcellular movement / Schaffer collateral - CA1 synapse / Z disc / nuclear matrix / calcium-dependent protein binding / actin filament binding / actin cytoskeleton / lamellipodium / Factors involved in megakaryocyte development and platelet production / actin binding / cell body / actin cytoskeleton organization / protein-containing complex assembly / cytoskeleton / postsynaptic density / cadherin binding / protein domain specific binding / hydrolase activity / calcium ion binding / positive regulation of gene expression / magnesium ion binding / extracellular space / extracellular exosome / extracellular region / ATP binding / identical protein binding / membrane / cytoplasm / cytosol
Similarity search - Function
F-actin-capping protein subunit beta / F-actin capping protein, beta subunit, conserved site / F-actin-capping protein subunit beta, N-terminal domain / F-actin capping protein, beta subunit / F-actin capping protein beta subunit signature. / F-actin capping protein, alpha subunit, conserved site / F-actin capping protein alpha subunit signature 1. / F-actin capping protein alpha subunit signature 2. / F-actin-capping protein subunit alpha / F-actin-capping protein subunit alpha/beta ...F-actin-capping protein subunit beta / F-actin capping protein, beta subunit, conserved site / F-actin-capping protein subunit beta, N-terminal domain / F-actin capping protein, beta subunit / F-actin capping protein beta subunit signature. / F-actin capping protein, alpha subunit, conserved site / F-actin capping protein alpha subunit signature 1. / F-actin capping protein alpha subunit signature 2. / F-actin-capping protein subunit alpha / F-actin-capping protein subunit alpha/beta / F-actin-capping protein subunit alpha/beta, domain 2 / F-actin capping protein, alpha subunit, domain 1 / F-actin capping protein alpha subunit / ADF/Cofilin / Actin-depolymerising factor homology domain / Cofilin/tropomyosin-type actin-binding protein / ADF-H domain profile. / Actin depolymerisation factor/cofilin -like domains / ADF-H/Gelsolin-like domain superfamily / 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
F-actin-capping protein subunit beta / F-actin-capping protein subunit alpha-1 / Actin, alpha skeletal muscle / Cofilin-2
Similarity search - Component
Biological speciesOryctolagus cuniculus (rabbit) / Homo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.06 Å
AuthorsPalmer NJ / Dominguez R
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS) United States
CitationJournal: To Be Published
Title: Mechanisms of Actin Filament Depolymerization by Cyclase Associated Protein-1 and Cofilin-2
Authors: Palmer NJ / Boczkowska M / Rebowski G / Dominguez R
History
DepositionSep 14, 2025-
Header (metadata) releaseMar 4, 2026-
Map releaseMar 4, 2026-
UpdateMar 4, 2026-
Current statusMar 4, 2026Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_72711.png

Downloads & links

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Map

FileDownload / File: emd_72711.map.gz / Format: CCP4 / Size: 1000 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.54 Å/pix.
x 640 pix.
= 345.6 Å		0.54 Å/pix.
x 640 pix.
= 345.6 Å		0.54 Å/pix.
x 640 pix.
= 345.6 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.54 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.0745
Minimum - Maximum-0.08145798 - 0.3379909
Average (Standard dev.)0.003214842 (±0.011056784)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions640640640
Spacing640640640
CellA=B=C: 345.6 Å
α=β=γ: 90.0 °

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Supplemental data

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Sample components

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Entire : Complex of the Cyclase Associated Protein-1 bound to F-actin

EntireName: Complex of the Cyclase Associated Protein-1 bound to F-actin
Components
  • Complex: Complex of the Cyclase Associated Protein-1 bound to F-actin
    • Complex: Actin, alpha skeletal muscle
      • Protein or peptide: Actin, alpha skeletal muscle
    • Complex: Cofilin-2
      • Protein or peptide: Cofilin-2
    • Complex: Capping Protein
      • Protein or peptide: F-actin-capping protein subunit alpha-1
      • Protein or peptide: F-actin-capping protein subunit beta
  • Ligand: ADENOSINE-5'-DIPHOSPHATE
  • Ligand: MAGNESIUM ION

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Supramolecule #1: Complex of the Cyclase Associated Protein-1 bound to F-actin

SupramoleculeName: Complex of the Cyclase Associated Protein-1 bound to F-actin
type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#4

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Supramolecule #2: Actin, alpha skeletal muscle

SupramoleculeName: Actin, alpha skeletal muscle / type: complex / ID: 2 / Parent: 1 / Macromolecule list: #1

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Supramolecule #3: Cofilin-2

SupramoleculeName: Cofilin-2 / type: complex / ID: 3 / Parent: 1 / Macromolecule list: #4
Source (natural)Organism: Oryctolagus cuniculus (rabbit)

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Supramolecule #4: Capping Protein

SupramoleculeName: Capping Protein / type: complex / ID: 4 / Parent: 1 / Macromolecule list: #2-#3
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: Actin, alpha skeletal muscle

MacromoleculeName: Actin, alpha skeletal muscle / type: protein_or_peptide / ID: 1 / Number of copies: 5 / Enantiomer: LEVO
EC number: Hydrolases; Acting on acid anhydrides; Acting on acid anhydrides to facilitate cellular and subcellular movement
Source (natural)Organism: Oryctolagus cuniculus (rabbit)
Molecular weightTheoretical: 41.978773 KDa
SequenceString: CDEDETTALV CDNGSGLVKA GFAGDDAPRA VFPSIVGRPR HQGVMVGMGQ KDSYVGDEAQ SKRGILTLKY PIE(HIC)GI ITN WDDMEKIWHH TFYNELRVAP EEHPTLLTEA PLNPKANREK MTQIMFETFN VPAMYVAIQA VLSLYASGRT TGIVLDS GD GVTHNVPIYE ...String:
CDEDETTALV CDNGSGLVKA GFAGDDAPRA VFPSIVGRPR HQGVMVGMGQ KDSYVGDEAQ SKRGILTLKY PIE(HIC)GI ITN WDDMEKIWHH TFYNELRVAP EEHPTLLTEA PLNPKANREK MTQIMFETFN VPAMYVAIQA VLSLYASGRT TGIVLDS GD GVTHNVPIYE GYALPHAIMR LDLAGRDLTD YLMKILTERG YSFVTTAERE IVRDIKEKLC YVALDFENEM ATAASSSS L EKSYELPDGQ VITIGNERFR CPETLFQPSF IGMESAGIHE TTYNSIMKCD IDIRKDLYAN NVMSGGTTMY PGIADRMQK EITALAPSTM KIKIIAPPER KYSVWIGGSI LASLSTFQQM WITKQEYDEA GPSIVHRKCF

UniProtKB: Actin, alpha skeletal muscle

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Macromolecule #2: F-actin-capping protein subunit alpha-1

MacromoleculeName: F-actin-capping protein subunit alpha-1 / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 32.728492 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MADFDDRVSD EEKVRIAAKF ITHAPPGEFN EVFNDVRLLL NNDNLLREGA AHAFAQYNMD QFTPVKIEGY EDQVLITEHG DLGNSRFLD PRNKISFKFD HLRKEASDPQ PEEADGGLKS WRESCDSALR AYVKDHYSNG FCTVYAKTID GQQTIIACIE S HQFQPKNF ...String:
MADFDDRVSD EEKVRIAAKF ITHAPPGEFN EVFNDVRLLL NNDNLLREGA AHAFAQYNMD QFTPVKIEGY EDQVLITEHG DLGNSRFLD PRNKISFKFD HLRKEASDPQ PEEADGGLKS WRESCDSALR AYVKDHYSNG FCTVYAKTID GQQTIIACIE S HQFQPKNF WNGRWRSEWK FTITPPTAQV VGVLKIQVHY YEDGNVQLVS HKDVQDSLTV SNEAQTAKEF IKIIENAENE YQ TAISENY QTMSDTTFKA LRRQLPVTRT KIDWNKILSY (UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)

UniProtKB: F-actin-capping protein subunit alpha-1

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Macromolecule #3: F-actin-capping protein subunit beta

MacromoleculeName: F-actin-capping protein subunit beta / type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 30.669768 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MSDQQLDCAL DLMRRLPPQQ IEKNLSDLID LVPSLCEDLL SSVDQPLKIA RDKVVGKDYL LCDYNRDGDS YRSPWSNKYD PPLEDGAMP SARLRKLEVE ANNAFDQYRD LYFEGGVSSV YLWDLDHGFA GVILIKKAGD GSKKIKGCWD SIHVVEVQEK S SGRTAHYK ...String:
MSDQQLDCAL DLMRRLPPQQ IEKNLSDLID LVPSLCEDLL SSVDQPLKIA RDKVVGKDYL LCDYNRDGDS YRSPWSNKYD PPLEDGAMP SARLRKLEVE ANNAFDQYRD LYFEGGVSSV YLWDLDHGFA GVILIKKAGD GSKKIKGCWD SIHVVEVQEK S SGRTAHYK LTSTVMLWLQ TNKSGSGTMN LGGSLTRQME KDETVSDCSP HIANIGRLVE DMENKIRSTL NEIYFGKTKD IV NGLRSVQ TFADKSKQEA LKNDLVEALK RKQQC

UniProtKB: F-actin-capping protein subunit beta

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Macromolecule #4: Cofilin-2

MacromoleculeName: Cofilin-2 / type: protein_or_peptide / ID: 4 / Number of copies: 3 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 18.765627 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
MASGVTVNDE VIKVFNDMKV RKSSTQEEIK KRKKAVLFCL SDDKRQIIVE EAKQILVGDI GDTVEDPYTS FVKLLPLNDC RYALYDATY ETKESKKEDL VFIFWAPESA PLKSKMIYAS SKDAIKKKFT GIKHEWQVNG LDDIKDRSTL GEKLGGNVVV S LEGKPL

UniProtKB: Cofilin-2

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Macromolecule #5: ADENOSINE-5'-DIPHOSPHATE

MacromoleculeName: ADENOSINE-5'-DIPHOSPHATE / type: ligand / ID: 5 / 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 #6: MAGNESIUM ION

MacromoleculeName: MAGNESIUM ION / type: ligand / ID: 6 / Number of copies: 5 / Formula: MG
Molecular weightTheoretical: 24.305 Da

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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: 7.5
GridModel: Quantifoil R1.2/1.3 / Material: COPPER / Mesh: 300 / Support film - Material: CARBON / Support film - topology: HOLEY / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 120 sec.
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 50.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: SPOT SCAN / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.5 µm / Nominal defocus min: 0.5 µm / Nominal magnification: 89000
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionSoftware - Name: cryoSPARC (ver. 4.7) / Type: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: NONE
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.06 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC (ver. 4.7) / Number images used: 79486
Initial angle assignmentType: RANDOM ASSIGNMENT / Software - Name: cryoSPARC
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC (ver. 4.7)

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