1IZN image
Deposition Date 2002-10-10
Release Date 2003-04-08
Last Version Date 2023-12-27
Entry Detail
PDB ID:
1IZN
Keywords:
Title:
Crystal Structure of Actin Filament Capping Protein CapZ
Biological Source:
Source Organism:
Gallus gallus (Taxon ID: 9031)
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.10 Å
R-Value Free:
0.26
R-Value Work:
0.22
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:CapZ alpha-1 subunit
Gene (Uniprot):CAPZA1
Chain IDs:A, C
Chain Length:286
Number of Molecules:2
Biological Source:Gallus gallus
Polymer Type:polypeptide(L)
Molecule:CapZ beta-1 subunit
Gene (Uniprot):CAPZB
Chain IDs:B, D
Chain Length:277
Number of Molecules:2
Biological Source:Gallus gallus
Ligand Molecules
Primary Citation
Crystal structure of CapZ: structural basis for actin filament barbed end capping
EMBO J. 22 1529 1538 (2003)
PMID: 12660160 DOI: 10.1093/emboj/cdg167

Abstact

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.

Legend

Protein

Chemical

Disease

Primary Citation of related structures