Download MendeleyRemodeling of actin filaments by ADF/cofilin proteins.
Galkin, V.E., Orlova, A., Kudryashov, D.S., Solodukhin, A., Reisler, E., Schroder, G.F., Egelman, E.H.(2011) Proc Natl Acad Sci U S A 108: 20568-20572
- PubMed: 22158895
- DOI: https://doi.org/10.1073/pnas.1110109108
- Primary Citation of Related Structures:
3J0S - PubMed Abstract:
Cofilin/ADF proteins play key roles in the dynamics of actin, one of the most abundant and highly conserved eukaryotic proteins. We used cryoelectron microscopy to generate a 9-Å resolution three-dimensional reconstruction of cofilin-decorated actin filaments, the highest resolution achieved for a complex of F-actin with an actin-binding protein. We show that the cofilin-induced change in the filament twist is due to a unique conformation of the actin molecule unrelated to any previously observed state. The changes between the actin protomer in naked F-actin and in the actin-cofilin filament are greater than the conformational changes between G- and F-actin. Our results show the structural plasticity of actin, suggest that other actin-binding proteins may also induce large but different conformational changes, and show that F-actin cannot be described by a single molecular model.
Organizational Affiliation:
Department of Biochemistry and Molecular Genetics, University of Virginia, Box 800733, Charlottesville, VA 22908-0733, USA. galkin@virginia.edu
