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- PDB-9fjo: Structure of the undecorated pointed end of F-actin -

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Basic information

Entry
Database: PDB / ID: 9fjo
TitleStructure of the undecorated pointed end of F-actin
ComponentsActin, alpha skeletal muscle
KeywordsSTRUCTURAL PROTEIN / actin / filament / pointed end
Function / homology
Function and homology information


cytoskeletal motor activator activity / tropomyosin binding / myosin heavy chain binding / mesenchyme migration / troponin I binding / filamentous actin / actin filament bundle / skeletal muscle thin filament assembly / actin filament bundle assembly / striated muscle thin filament ...cytoskeletal motor activator activity / tropomyosin binding / myosin heavy chain binding / mesenchyme migration / troponin I binding / filamentous actin / actin filament bundle / skeletal muscle thin filament assembly / actin filament bundle assembly / striated muscle thin filament / skeletal muscle myofibril / actin monomer binding / skeletal muscle fiber development / stress fiber / titin binding / actin filament polymerization / filopodium / actin filament / Hydrolases; Acting on acid anhydrides; Acting on acid anhydrides to facilitate cellular and subcellular movement / calcium-dependent protein binding / lamellipodium / cell body / hydrolase activity / protein domain specific binding / calcium ion binding / positive regulation of gene expression / magnesium ion binding / ATP binding / identical protein binding / cytoplasm
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
ADENOSINE-5'-DIPHOSPHATE / Actin, alpha skeletal muscle
Similarity search - Component
Biological speciesOryctolagus cuniculus (rabbit)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.05 Å
AuthorsBoiero Sanders, M. / Oosterheert, W. / Hofnagel, O. / Bieling, P. / Raunser, S.
Funding support Germany, European Union, 3items
OrganizationGrant numberCountry
Alexander von Humboldt Foundation Germany
German Research Foundation (DFG)BI 1998/2-1 Germany
European Research Council (ERC)856118European Union
CitationJournal: Nat Commun / Year: 2024
Title: Phalloidin and DNase I-bound F-actin pointed end structures reveal principles of filament stabilization and disassembly.
Authors: Micaela Boiero Sanders / Wout Oosterheert / Oliver Hofnagel / Peter Bieling / Stefan Raunser /
Abstract: Actin filament turnover involves subunits binding to and dissociating from the filament ends, with the pointed end being the primary site of filament disassembly. Several molecules modulate filament ...Actin filament turnover involves subunits binding to and dissociating from the filament ends, with the pointed end being the primary site of filament disassembly. Several molecules modulate filament turnover, but the underlying mechanisms remain incompletely understood. Here, we present three cryo-EM structures of the F-actin pointed end in the presence and absence of phalloidin or DNase I. The two terminal subunits at the undecorated pointed end adopt a twisted conformation. Phalloidin can still bind and bridge these subunits, inducing a conformational shift to a flattened, F-actin-like state. This explains how phalloidin prevents depolymerization at the pointed end. Interestingly, two DNase I molecules simultaneously bind to the phalloidin-stabilized pointed end. In the absence of phalloidin, DNase I binding would disrupt the terminal actin subunit packing, resulting in filament disassembly. Our findings uncover molecular principles of pointed end regulation and provide structural insights into the kinetic asymmetry between the actin filament ends.
History
DepositionMay 31, 2024Deposition site: PDBE / Processing site: PDBE
Revision 1.0Sep 11, 2024Provider: repository / Type: Initial release
Revision 1.1Oct 2, 2024Group: Data collection / Database references / Category: citation / em_admin
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _em_admin.last_update

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Actin, alpha skeletal muscle
B: Actin, alpha skeletal muscle
C: Actin, alpha skeletal muscle
D: Actin, alpha skeletal muscle
hetero molecules


Theoretical massNumber of molelcules
Total (without water)169,30912
Polymers167,5034
Non-polymers1,8068
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
Actin, alpha skeletal muscle / Alpha-actin-1


Mass: 41875.633 Da / Num. of mol.: 4 / Source method: isolated from a natural source
Details: Rabbit skeletal alpha actin purified from frozen rabbit muscle acetone powder.
Source: (natural) Oryctolagus cuniculus (rabbit) / Tissue: Skeletal muscle / References: UniProt: P68135
#2: Chemical
ChemComp-ADP / ADENOSINE-5'-DIPHOSPHATE


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


Mass: 24.305 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: Mg
Has ligand of interestY

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Experimental details

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Experiment

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

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Sample preparation

ComponentName: Complex of actin subunits that form the pointed end of actin filaments.
Type: COMPLEX
Details: Alpha actin was purified from skeletal muscle. Actin filaments were polymerized in the presence of the formin INF2, which was purified separetely and added during polymerization prior to ...Details: Alpha actin was purified from skeletal muscle. Actin filaments were polymerized in the presence of the formin INF2, which was purified separetely and added during polymerization prior to cryo-EM grid preparation.
Entity ID: #1 / Source: NATURAL
Molecular weightExperimental value: NO
Source (natural)Organism: Oryctolagus cuniculus (rabbit) / Tissue: Skeletal muscle
Buffer solutionpH: 7.1
Details: 12 mM HEPES pH 7.1, 100 mM KCl, 2.1 mM MgCl2, 1 mM EGTA, 1 mM TCEP, 0.2 mM ATP
Buffer component
IDConc.NameFormulaBuffer-ID
112 mMHEPES1
2100 mMsodium chlorideNaCl1
32.1 mMmagnesium chlorideMgCl21
41 mMEGTA1
51 mMTCEP1
60.2 mMATP1
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: GOLD / Grid mesh size: 200 divisions/in. / Grid type: Quantifoil R2/1
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE-PROPANE / Humidity: 100 % / Chamber temperature: 286 K / Details: 3 seconds, force 0.

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Details: 300 kV Titan Krios G3 microscope (Thermo Fisher Scientific).
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal magnification: 105000 X / Nominal defocus max: 2900 nm / Nominal defocus min: 1300 nm / Cs: 2.7 mm / C2 aperture diameter: 50 µm
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingElectron dose: 60.6 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Num. of grids imaged: 1 / Num. of real images: 20305
EM imaging opticsEnergyfilter name: GIF Bioquantum / Details: Gatan energy filter / Energyfilter slit width: 15 eV
Spherical aberration corrector: 300 kV Titan Krios G3 microscope (Thermo Fisher Scientific).

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Processing

EM software
IDNameVersionCategory
1crYOLO1.8particle selection
2EPU2.8image acquisition
4CTFFIND4.13CTF correction
7UCSF ChimeraX1.6.1model fitting
9cryoSPARC4.1.0initial Euler assignment
10cryoSPARC4.2.1final Euler assignment
11cryoSPARC4.2.1classification
12cryoSPARC4.2.13D reconstruction
13Coot0.9.8.1model refinement
14PHENIX1.21rc1_5015model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 1935707 / Details: Particles picked using SPHIRE-crYOLO.
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.05 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 206373 / Symmetry type: POINT
Atomic model buildingProtocol: FLEXIBLE FIT / Space: REAL / Details: Real Space Refinement in Phenix.
Atomic model buildingPDB-ID: 8A2T

8a2t


Accession code: 8A2T / Source name: PDB / Type: experimental model
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00211714
ELECTRON MICROSCOPYf_angle_d0.50515900
ELECTRON MICROSCOPYf_dihedral_angle_d5.6631630
ELECTRON MICROSCOPYf_chiral_restr0.0421770
ELECTRON MICROSCOPYf_plane_restr0.0032028

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