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Pattern formation and the mechanics of a mixture of actin filaments andmyosin motors that is confined by a rigid membrane is investigated. By using acoarse-grained molecular dynamics model, we demonstrate that the competitionbetween the depletion force and the active force of the motors gives rise toactin accumulation in the membrane vicinity. The resulting actomyosin structureexerts pressure on the membrane, that, due to nematic alignment of thefilaments, converges to a constant for large motor active force. The resultsare independent of filament length and membrane curvature, indicating theuniversality of this phenomenon. Thus, this study proposes a novel mechanism bywhich the compounds of the cytoskeleton can self-organize into a higher-orderstructure.

Pattern formation and the mechanics of a motor-driven filamentous system confined by rigid membranes