Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Biological Assembly Evidence: gel filtration

Biological Assembly 2  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 2 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 90.02 kDa 
• Atom Count: 5698 
• Residue Count: 703 
• Unique protein chains: 1

6RSQ

Helical folded domain of mouse CAP1

• DOI: 10.2210/pdb6RSQ/pdb

• Classification: CONTRACTILE PROTEIN
• Organism(s): Mus musculus
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2019-05-22 Released: 2019-11-27 
• Deposition Author(s): Kotila, T., Kogan, K., Lappalainen, P.
• Funding Organization(s): Academy of Finland

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.37 Å
• R-Value Free: 0.230 
• R-Value Work: 0.186 
• R-Value Observed: 0.188 

Literature

Mechanism of synergistic actin filament pointed end depolymerization by cyclase-associated protein and cofilin.

Kotila, T., Wioland, H., Enkavi, G., Kogan, K., Vattulainen, I., Jegou, A., Romet-Lemonne, G., Lappalainen, P.

(2019) Nat Commun 10: 5320-5320

• PubMed: 31757941 
• DOI: 10.1038/s41467-019-13213-2
• Primary Citation of Related Structures:  
  6RSW, 6RSQ


• PubMed Abstract: 
  

The ability of cells to generate forces through actin filament turnover was an early adaptation in evolution. While much is known about how actin filaments grow, mechanisms of their disassembly are incompletely understood. The best-characterized actin disassembly factors are the cofilin family proteins, which increase cytoskeletal dynamics by severing actin filaments. However, the mechanism by which severed actin filaments are recycled back to monomeric form has remained enigmatic. We report that cyclase-associated-protein (CAP) works in synergy with cofilin to accelerate actin filament depolymerization by nearly 100-fold. Structural work uncovers the molecular mechanism by which CAP interacts with actin filament pointed end to destabilize the interface between terminal actin subunits, and subsequently recycles the newly-depolymerized actin monomer for the next round of filament assembly. These findings establish CAP as a molecular machine promoting rapid actin filament depolymerization and monomer recycling, and explain why CAP is critical for actin-dependent processes in all eukaryotes.

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Organizational Affiliation: 

HiLIFE Institute of Biotechnology, University of Helsinki, FI-00014, Helsinki, Finland. [e-mail].

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Adenylyl cyclase-associated protein 1	A, B, C, D	198	Mus musculus	Mutation(s): 0  Gene Names: Cap1, Cap
Find proteins for P40124 (Mus musculus) Explore P40124  Go to UniProtKB:  P40124

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
GOL	A, C, D	GLYCEROL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.37 Å
• R-Value Free: 0.230 
• R-Value Work: 0.186 
• R-Value Observed: 0.188 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 82.51	α = 90
b = 91.41	β = 90
c = 106.87	γ = 90

Software Package:

Software Name	Purpose
BUSTER	refinement
XDS	data reduction
XSCALE	data scaling
PHASER	phasing

Structure Validation

Entry History & Funding Information

Deposition Data

• Deposited Date: 2019-05-22 
• Released Date: 2019-11-27 
Deposition Author(s): Kotila, T., Kogan, K., Lappalainen, P.

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Funding Organization	Location	Grant Number
Academy of Finland	Finland	320161
Academy of Finland	Finland	307415

Revision History 

• Version 1.0: 2019-11-27
  Type: Initial release
  
• Version 1.1: 2019-12-04
  Changes: Database references