Journal
NANO LETTERS
Volume 20, Issue 9, Pages 6281-6288Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c01546
Keywords
Active nematics; instability; microtubules; motor proteins
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Funding
- MaxSynBio Consortium - Federal Ministry of Education and Research of Germany
- MaxSynBio Consortium - Max Planck Society
- Volkswagen Stiftung
- Slovenian Research Agency [P1-0099]
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In nature, interactions between biopolymers and motor proteins give rise to biologically essential emergent behaviors. Besides cytoskeleton mechanics, active nematics arise from such interactions. Here we present a study on 3D active nematics made of microtubules, kinesin motors, and depleting agent. It shows a rich behavior evolving from a nematically ordered space-filling distribution of microtubule bundles toward a flattened and contracted 2D ribbon that undergoes a wrinkling instability and subsequently transitions into a 3D active turbulent state. The wrinkle wavelength is independent of the ATP concentration and our theoretical model describes its relation with the appearance time. We compare the experimental results with a numerical simulation that confirms the key role of kinesin motors in cross-linking and sliding the microtubules. Our results on the active contraction of the network and the independence of wrinkle wavelength on ATP concentration are important steps forward for the understanding of these 3D systems.
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