2QDQ image
Deposition Date 2007-06-21
Release Date 2008-01-29
Last Version Date 2024-02-21
Entry Detail
PDB ID:
2QDQ
Title:
Crystal structure of the talin dimerisation domain
Biological Source:
Source Organism:
Mus musculus (Taxon ID: 10090)
Method Details:
Experimental Method:
Resolution:
2.20 Å
R-Value Free:
0.31
R-Value Work:
0.25
R-Value Observed:
0.25
Space Group:
P 41 3 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Talin-1
Gene (Uniprot):Tln1
Chain IDs:A, B
Chain Length:50
Number of Molecules:2
Biological Source:Mus musculus
Primary Citation
The structure of the C-terminal actin-binding domain of talin.
Embo J. 27 458 469 (2008)
PMID: 18157087 DOI: 10.1038/sj.emboj.7601965

Abstact

Talin is a large dimeric protein that couples integrins to cytoskeletal actin. Here, we report the structure of the C-terminal actin-binding domain of talin, the core of which is a five-helix bundle linked to a C-terminal helix responsible for dimerisation. The NMR structure of the bundle reveals a conserved surface-exposed hydrophobic patch surrounded by positively charged groups. We have mapped the actin-binding site to this surface and shown that helix 1 on the opposite side of the bundle negatively regulates actin binding. The crystal structure of the dimerisation helix reveals an antiparallel coiled-coil with conserved residues clustered on the solvent-exposed face. Mutagenesis shows that dimerisation is essential for filamentous actin (F-actin) binding and indicates that the dimerisation helix itself contributes to binding. We have used these structures together with small angle X-ray scattering to derive a model of the entire domain. Electron microscopy provides direct evidence for binding of the dimer to F-actin and indicates that it binds to three monomers along the long-pitch helix of the actin filament.

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