Structural and Viscoelastic Properties of Actin Networks Formed by Espin or Physiologically Relevant Espin Mutants

摘要

The structural organization of the cytoskeleton determines its viscoelastic response which is crucial for the correct functionality of living cells. Both the mechanical response and microstructure of the cytoskeleton are regulated on a microscopic level by the local activation of different actin binding and/or bundling proteins (ABPs). Misregulations in the expression of these ABPs or mutations in their sequence can entail severe cellular dysfunctions and diseases. Here, we study the structural and viscoelastic properties of reconstituted actin networks formed by the ABP espin and compare the obtained network properties to those of other bundled actin networks. Moreover, we quantify the impact of physiologically relevant espin mutations on the viscoelastic properties of these cytoskeletal networks.