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Are microtubules electron-based topological insulators?

Subramanyan, V and Kirkpatrick, KL and Vishveshwara, S and Vishveshwara, S (2023) Are microtubules electron-based topological insulators? In: EPL, 143 (4).

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Official URL: https://doi.org/10.1209/0295-5075/acec94


A microtubule is a cylindrical biological polymer that plays key roles in cellular structure, transport, and signalling. In this work, based on studies of electronic properties of polyacetelene and mechanical properties of microtubules themselves (Spakowitz A. J., Phys. Rev. Lett., 103 (2009) 248101), we explore the possibility that microtubules could act as topological insulators that are gapped to electronic excitations in the bulk but possess robust electronic bounds states at the tube ends. Through analyses of structural and electronic properties, we model the microtubule as a cylindrical stack of Su-Schrieffer-Heeger chains (originally proposed in the context of polyacetylene) describing electron hopping between the underlying dimerized tubulin lattice sites. We postulate that the microtubule is mostly uniform, dominated purely by GDP-bound dimers, and is capped by a disordered regime due to the presence of GTP-bound dimers as well. In the uniform region, we identify the electron hopping parameter regime in which the microtubule is a topological insulator. We then show the manner in which these topological features remain robust when the hopping parameters are disordered. We briefly mention possible biological implications for these microtubules to possess topologically robust electronic bound states. © Copyright © 2023 The author(s).

Item Type: Journal Article
Publication: EPL
Publisher: Institute of Physics
Additional Information: The copyright for this article belongs to the Authors.
Department/Centre: Division of Biological Sciences > Molecular Biophysics Unit
Date Deposited: 28 Oct 2023 10:05
Last Modified: 28 Oct 2023 10:05
URI: https://eprints.iisc.ac.in/id/eprint/83134

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