Domain movement in gelsolin: a calcium-activated switch.
The actin-binding protein gelsolin is involved in remodeling the actin cytoskeleton during growth-factor signaling, apoptosis, cytokinesis, and cell movement. Calcium-activated gelsolin severs and caps actin filaments. The 3.4 angstrom x-ray structure of the carboxyl-terminal half of gelsolin (G4-G6) in complex with actin reveals the basis for gelsolin activation. Calcium binding ... induces a conformational rearrangement in which domain G6 is flipped over and translated by about 40 angstroms relative to G4 and G5. The structural reorganization tears apart the continuous beta sheet core of G4 and G6. This exposes the actin-binding site on G4, enabling severing and capping of actin filaments to proceed.
Mesh Terms:
Actins, Binding Sites, Crystallography, X-Ray, Gelsolin, Hydrogen Bonding, Models, Molecular, Protein Binding, Protein Conformation, Protein Structure, Secondary, Protein Structure, Tertiary
Actins, Binding Sites, Crystallography, X-Ray, Gelsolin, Hydrogen Bonding, Models, Molecular, Protein Binding, Protein Conformation, Protein Structure, Secondary, Protein Structure, Tertiary
Science
Date: Dec. 03, 1999
PubMed ID: 10583954
View in: Pubmed Google Scholar
Download Curated Data For This Publication
228
Switch View:
- Interactions 1