7CCC

The structure of the actin filament uncapping complex mediated by twinfilin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.192 

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Literature

The structure of the actin filament uncapping complex mediated by twinfilin.

Mwangangi, D.M.Manser, E.Robinson, R.C.

(2021) Sci Adv 7

  • DOI: 10.1126/sciadv.abd5271
  • Primary Citation of Related Structures:  
    7CCC

  • PubMed Abstract: 
  • Uncapping of actin filaments is essential for driving polymerization and depolymerization dynamics from capping protein-associated filaments; however, the mechanisms of uncapping leading to rapid disassembly are unknown. Here, we elucidated the x-ray crystal structure of the actin/twinfilin/capping protein complex to address the mechanisms of twinfilin uncapping of actin filaments ...

    Uncapping of actin filaments is essential for driving polymerization and depolymerization dynamics from capping protein-associated filaments; however, the mechanisms of uncapping leading to rapid disassembly are unknown. Here, we elucidated the x-ray crystal structure of the actin/twinfilin/capping protein complex to address the mechanisms of twinfilin uncapping of actin filaments. The twinfilin/capping protein complex binds to two G-actin subunits in an orientation that resembles the actin filament barbed end. This suggests an unanticipated mechanism by which twinfilin disrupts the stable capping of actin filaments by inducing a G-actin conformation in the two terminal actin subunits. Furthermore, twinfilin disorders critical actin-capping protein interactions, which will assist in the dissociation of capping protein, and may promote filament uncapping through a second mechanism involving V-1 competition for an actin-binding surface on capping protein. The extensive interactions with capping protein indicate that the evolutionary conserved role of twinfilin is to uncap actin filaments.


    Organizational Affiliation

    Research Institute for Interdisciplinary Science (RIIS), Okayama University, Okayama 700-8530, Japan.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Actin, alpha skeletal muscleA, E377Oryctolagus cuniculusMutation(s): 0 
Gene Names: ACTA1ACTA
UniProt
Find proteins for P68135 (Oryctolagus cuniculus)
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Go to UniProtKB:  P68135
Entity Groups  
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UniProt GroupP68135
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Twinfilin-1B350Homo sapiensMutation(s): 0 
Gene Names: TWF1PTK9
UniProt & NIH Common Fund Data Resources
Find proteins for Q12792 (Homo sapiens)
Explore Q12792 
Go to UniProtKB:  Q12792
PHAROS:  Q12792
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UniProt GroupQ12792
Protein Feature View
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
F-actin-capping protein subunit alphaC286Mus musculusMutation(s): 1 
Gene Names: Capza1Cappa1
UniProt & NIH Common Fund Data Resources
Find proteins for P47753 (Mus musculus)
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Go to UniProtKB:  P47753
IMPC:  MGI:106227
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UniProt GroupP47753
Protein Feature View
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
F-actin-capping protein subunit betaD272Mus musculusMutation(s): 0 
Gene Names: Capzb
UniProt & NIH Common Fund Data Resources
Find proteins for Q923G3 (Mus musculus)
Explore Q923G3 
Go to UniProtKB:  Q923G3
IMPC:  MGI:104652
Entity Groups  
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UniProt GroupQ923G3
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ADP
Query on ADP

Download Ideal Coordinates CCD File 
G [auth A],
I [auth E]
ADENOSINE-5'-DIPHOSPHATE
C10 H15 N5 O10 P2
XTWYTFMLZFPYCI-KQYNXXCUSA-N
 Ligand Interaction
CA
Query on CA

Download Ideal Coordinates CCD File 
F [auth A],
H [auth E]
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
HIC
Query on HIC
A, E L-PEPTIDE LINKINGC7 H11 N3 O2HIS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.192 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 74.759α = 90
b = 168.662β = 90
c = 176.989γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
PHASERphasing
PDB_EXTRACTdata extraction

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Human Frontier Science Program (HFSP)RGP0028/2018

Revision History  (Full details and data files)

  • Version 1.0: 2021-02-03
    Type: Initial release
  • Version 1.1: 2021-02-24
    Changes: Database references