Crosslinking and depletion determine spatial instabilities in cytoskeletal active matter.
Soft Matter
; 18(19): 3793-3800, 2022 May 18.
Article
em En
| MEDLINE
| ID: mdl-35521993
ABSTRACT
Active gels made of cytoskeletal proteins are valuable materials with attractive non-equilibrium properties such as spatial self-organization and self-propulsion. At least four typical routes to spatial patterning have been reported to date in different types of cytoskeletal active gels bending and buckling instabilities in extensile systems, and global and local contraction instabilities in contractile gels. Here we report the observation of these four instabilities in a single type of active gel and we show that they are controlled by two parameters the concentrations of ATP and depletion agent. We demonstrate that as the ATP concentration decreases, the concentration of passive motors increases until the gel undergoes a gelation transition. At this point, buckling is selected against bending, while global contraction is favored over local ones. Our observations are coherent with a hydrodynamic model of a viscoelastic active gel where the filaments are crosslinked with a characteristic time that diverges as the ATP concentration decreases. Our work thus provides a unified view of spatial instabilities in cytoskeletal active matter.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Citoesqueleto
/
Hidrodinâmica
Tipo de estudo:
Prognostic_studies
Idioma:
En
Revista:
Soft Matter
Ano de publicação:
2022
Tipo de documento:
Article
País de afiliação:
França