1IZN

Crystal Structure of Actin Filament Capping Protein CapZ


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.222 

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This is version 1.3 of the entry. See complete history


Literature

Crystal structure of CapZ: structural basis for actin filament barbed end capping

Yamashita, A.Maeda, K.Maeda, Y.

(2003) EMBO J 22: 1529-1538

  • DOI: https://doi.org/10.1093/emboj/cdg167
  • Primary Citation of Related Structures:  
    1IZN

  • PubMed Abstract: 

    Capping protein, a heterodimeric protein composed of alpha and beta subunits, is a key cellular component regulating actin filament assembly and organization. It binds to the barbed ends of the filaments and works as a 'cap' by preventing the addition and loss of actin monomers at the end. Here we describe the crystal structure of the chicken sarcomeric capping protein CapZ at 2.1 A resolution. The structure shows a striking resemblance between the alpha and beta subunits, so that the entire molecule has a pseudo 2-fold rotational symmetry. CapZ has a pair of mobile extensions for actin binding, one of which also provides concomitant binding to another protein for the actin filament targeting. The mobile extensions probably form flexible links to the end of the actin filament with a pseudo 2(1) helical symmetry, enabling the docking of the two in a symmetry mismatch.


  • Organizational Affiliation

    Laboratory for Structural Biochemistry, RIKEN Harima Institute at SPring-8, 1-1-1 Kouto, Mikazuki, Sayo, Hyogo, 679-5148, Japan. atsuko@spring8.or.jp


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
CapZ alpha-1 subunit
A, C
286Gallus gallusMutation(s): 0 
UniProt
Find proteins for P13127 (Gallus gallus)
Explore P13127 
Go to UniProtKB:  P13127
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP13127
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
CapZ beta-1 subunit
B, D
277Gallus gallusMutation(s): 0 
UniProt
Find proteins for P14315 (Gallus gallus)
Explore P14315 
Go to UniProtKB:  P14315
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP14315
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.222 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 99.2α = 90
b = 57.2β = 113
c = 99.2γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
SHARPphasing
CNSrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-04-08
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-12-27
    Changes: Data collection, Database references, Derived calculations