3DAW image
Entry Detail
PDB ID:
3DAW
Title:
Structure of the actin-depolymerizing factor homology domain in complex with actin
Biological Source:
Host Organism:
PDB Version:
Deposition Date:
2008-05-30
Release Date:
2008-07-29
Method Details:
Experimental Method:
Resolution:
2.55 Å
R-Value Free:
0.27
R-Value Work:
0.20
R-Value Observed:
0.21
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Actin, alpha skeletal muscle
Chain IDs:A
Chain Length:377
Number of Molecules:1
Biological Source:Oryctolagus cuniculus
Polymer Type:polypeptide(L)
Description:Twinfilin-1
Mutations:V168M
Chain IDs:B
Chain Length:164
Number of Molecules:1
Biological Source:Mus musculus
Primary Citation
Structure of the actin-depolymerizing factor homology domain in complex with actin
J.Cell Biol. 182 51 59 (2008)
PMID: 18625842 DOI: 10.1083/jcb.200803100

Abstact

Actin dynamics provide the driving force for many cellular processes including motility and endocytosis. Among the central cytoskeletal regulators are actin-depolymerizing factor (ADF)/cofilin, which depolymerizes actin filaments, and twinfilin, which sequesters actin monomers and caps filament barbed ends. Both interact with actin through an ADF homology (ADF-H) domain, which is also found in several other actin-binding proteins. However, in the absence of an atomic structure for the ADF-H domain in complex with actin, the mechanism by which these proteins interact with actin has remained unknown. Here, we present the crystal structure of twinfilin's C-terminal ADF-H domain in complex with an actin monomer. This domain binds between actin subdomains 1 and 3 through an interface that is conserved among ADF-H domain proteins. Based on this structure, we suggest a mechanism by which ADF/cofilin and twinfilin inhibit nucleotide exchange of actin monomers and present a model for how ADF/cofilin induces filament depolymerization by weakening intrafilament interactions.

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