8RV2

Structure of the formin INF2 bound to the barbed end of F-actin.

PDB DOI: https://doi.org/10.2210/pdb8RV2/pdb
EM Map EMD-19522: EMDB EMDataResource

Classification: STRUCTURAL PROTEIN
Organism(s): Oryctolagus cuniculus, Homo sapiens
Expression System: Escherichia coli
Mutation(s): No

Deposited: 2024-01-31 Released: 2024-04-10
Deposition Author(s): Oosterheert, W., Boiero Sanders, M., Funk, J., Prumbaum, D., Raunser, S., Bieling, P.
Funding Organization(s): Alexander von Humboldt Foundation, German Research Foundation (DFG), European Research Council (ERC)

Experimental Data Snapshot

Method: ELECTRON MICROSCOPY
Resolution: 3.41 Å
Aggregation State: PARTICLE
Reconstruction Method: SINGLE PARTICLE

Starting Model: experimental
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wwPDB Validation 3D Report Full Report

This is version 1.1 of the entry. See complete history.

Literature

Molecular mechanism of actin filament elongation by formins.

Oosterheert, W., Boiero Sanders, M., Funk, J., Prumbaum, D., Raunser, S., Bieling, P.

(2024) Science 384: eadn9560-eadn9560

PubMed: 38603491 Search on PubMed
DOI: https://doi.org/10.1126/science.adn9560
Primary Citation of Related Structures:
8RTT, 8RTY, 8RU0, 8RU2, 8RV2

PubMed Abstract:
Formins control the assembly of actin filaments (F-actin) that drive cell morphogenesis and motility in eukaryotes. However, their molecular interaction with F-actin and their mechanism of action remain unclear. In this work, we present high-resolution cryo-electron microscopy structures of F-actin barbed ends bound by three distinct formins, revealing a common asymmetric formin conformation imposed by the filament. Formation of new intersubunit contacts during actin polymerization sterically displaces formin and triggers its translocation. This "undock-and-lock" mechanism explains how actin-filament growth is coordinated with formin movement. Filament elongation speeds are controlled by the positioning and stability of actin-formin interfaces, which distinguish fast and slow formins. Furthermore, we provide a structure of the actin-formin-profilin ring complex, which resolves how profilin is rapidly released from the barbed end during filament elongation.

Organizational Affiliation

Department of Structural Biochemistry, Max Planck Institute of Molecular Physiology, 44227 Dortmund, Germany.

Macromolecule Content

Total Structure Weight: 338.39 kDa
Atom Count: 17,248
Modelled Residue Count: 2,178
Deposited Residue Count: 3,054
Unique protein chains: 2

Macromolecules

Find similar proteins by:

(by identity cutoff) | 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Actin, alpha skeletal muscle	A, B, C, D	375	Oryctolagus cuniculus	Mutation(s): 0 EC: 3.6.4
UniProt
Find proteins for P68135 (Oryctolagus cuniculus) Explore P68135 Go to UniProtKB: P68135
Entity Groups
Sequence Clusters	30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt Group	P68135
Sequence Annotations Expand
Reference Sequence

Find similar proteins by:

(by identity cutoff) | 3D Structure

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Isoform 2 of Inverted formin-2	E, F	777	Homo sapiens	Mutation(s): 0 Gene Names: INF2, C14orf151, C14orf173
UniProt & NIH Common Fund Data Resources
Find proteins for Q27J81 (Homo sapiens) Explore Q27J81 Go to UniProtKB: Q27J81
PHAROS: Q27J81 GTEx: ENSG00000203485
Entity Groups
Sequence Clusters	30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt Group	Q27J81
Sequence Annotations Expand
Reference Sequence

Small Molecules

Ligands 4 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
ATP (Subject of Investigation/LOI) Query on ATP Download Ideal Coordinates CCD File SDF format, chain N [auth D] MOL2 format, chain N [auth D] mmCIF format, chain N [auth D]	N [auth D]	ADENOSINE-5'-TRIPHOSPHATE C₁₀ H₁₆ N₅ O₁₃ P₃ ZKHQWZAMYRWXGA-KQYNXXCUSA-N		Interactions Focus chain N [auth D] Interactions & Density Focus chain N [auth D]
ADP (Subject of Investigation/LOI) Query on ADP Download Ideal Coordinates CCD File SDF format, chain G [auth A] SDF format, chain I [auth B] SDF format, chain L [auth C] MOL2 format, chain G [auth A] MOL2 format, chain I [auth B] MOL2 format, chain L [auth C] mmCIF format, chain G [auth A] mmCIF format, chain I [auth B] mmCIF format, chain L [auth C]	G [auth A], I [auth B], L [auth C]	ADENOSINE-5'-DIPHOSPHATE C₁₀ H₁₅ N₅ O₁₀ P₂ XTWYTFMLZFPYCI-KQYNXXCUSA-N		Interactions Focus chain G [auth A] Focus chain I [auth B] Focus chain L [auth C] Interactions & Density Focus chain G [auth A] Focus chain I [auth B] Focus chain L [auth C]
PO4 Query on PO4 Download Ideal Coordinates CCD File SDF format, chain K [auth B] MOL2 format, chain K [auth B] mmCIF format, chain K [auth B]	K [auth B]	PHOSPHATE ION O₄ P NBIIXXVUZAFLBC-UHFFFAOYSA-K		Interactions Focus chain K [auth B] Interactions & Density Focus chain K [auth B]
MG Query on MG Download Ideal Coordinates CCD File SDF format, chain H [auth A] SDF format, chain J [auth B] SDF format, chain M [auth C] SDF format, chain O [auth D] MOL2 format, chain H [auth A] MOL2 format, chain J [auth B] MOL2 format, chain M [auth C] MOL2 format, chain O [auth D] mmCIF format, chain H [auth A] mmCIF format, chain J [auth B] mmCIF format, chain M [auth C] mmCIF format, chain O [auth D]	H [auth A], J [auth B], M [auth C], O [auth D]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N		Interactions Focus chain H [auth A] Focus chain J [auth B] Focus chain M [auth C] Focus chain O [auth D] Interactions & Density Focus chain H [auth A] Focus chain J [auth B] Focus chain M [auth C] Focus chain O [auth D]