4EFH

Acanthamoeba Actin complex with Spir domain D


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.48 Å
  • R-Value Free: 0.207 
  • R-Value Work: 0.165 
  • R-Value Observed: 0.167 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.1 of the entry. See complete history


Literature

Multiple Forms of Spire-Actin Complexes and their Functional Consequences.

Chen, C.K.Sawaya, M.R.Phillips, M.L.Reisler, E.Quinlan, M.E.

(2012) J Biol Chem 287: 10684-10692

  • DOI: https://doi.org/10.1074/jbc.M111.317792
  • Primary Citation of Related Structures:  
    3UE5, 4EFH

  • PubMed Abstract: 

    Spire is a WH2 domain-containing actin nucleator essential for establishing an actin mesh during oogenesis. In vitro, in addition to nucleating filaments, Spire can sever them and sequester actin monomers. Understanding how Spire is capable of these disparate functions and which are physiologically relevant is an important goal. To study severing, we examined the effect of Drosophila Spire on preformed filaments in bulk and single filament assays. We observed rapid depolymerization of actin filaments by Spire, which we conclude is largely due to its sequestration activity and enhanced by its weak severing activity. We also studied the solution and crystal structures of Spire-actin complexes. We find structural and functional differences between constructs containing four WH2 domains (Spir-ABCD) and two WH2 domains (Spir-CD) that may provide insight into the mechanisms of nucleation and sequestration. Intriguingly, we observed lateral interactions between actin monomers associated with Spir-ABCD, suggesting that the structures built by these four tandem WH2 domains are more complex than originally imagined. Finally, we propose that Spire-actin mixtures contain both nuclei and sequestration structures.


  • Organizational Affiliation

    Department of Chemistry and Biochemistry, University of California Los Angeles, Los Angeles, California 90095.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Actin-1375Acanthamoeba castellaniiMutation(s): 0 
EC: 3.6.4
UniProt
Find proteins for P02578 (Acanthamoeba castellanii)
Explore P02578 
Go to UniProtKB:  P02578
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP02578
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Protein spire66Drosophila melanogasterMutation(s): 0 
Gene Names: spirp150-SpirCG10076
UniProt
Find proteins for Q9U1K1 (Drosophila melanogaster)
Explore Q9U1K1 
Go to UniProtKB:  Q9U1K1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9U1K1
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.48 Å
  • R-Value Free: 0.207 
  • R-Value Work: 0.165 
  • R-Value Observed: 0.167 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 53.006α = 90
b = 71.791β = 90
c = 126.089γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PHASERphasing
BUSTER-TNTrefinement
PDB_EXTRACTdata extraction
ADSCdata collection
BUSTERrefinement

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-04-11
    Type: Initial release
  • Version 1.1: 2023-09-13
    Changes: Data collection, Database references, Derived calculations, Refinement description