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Significance When an animal cell moves or divides, a disordered network of actin filaments (F-actin) builds mechanical scaffolds to drive cell-shape changes. Actin filaments are undergoing continual cycles of assembly and disassembly, known as turnover, but it is unknown how these dynamics impact the mechanical properties of actin-filament-based networks. Here, we show that actin-filament turnover dynamics contribute to mechanical stress relaxation. Additionally, we identify the factors necessary to generate a nonequilibrium steady state of dynamic actin filaments that provides a picture of their regulation in vivo.

Cofilin drives rapid turnover and fluidization of entangled F-actin