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Microtubules are hollow cylindrical filaments having a diameter of approximately 25 nm and a length that varies from 200 nm to 25 μm. GTP-bound tubulin subunits form αβ-heterodimers for microtubule assembly. These core building blocks interact longitudinally, polymerizing into protofilaments. The protofilaments then interact with one another through lateral bonding forces to form stable cylindrical microtubules. These cylindrical filaments are dynamic as they undergo repeated...
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Microtubules are dynamic structures that undergo continuous assembly and disassembly. They originate from specialized multi-protein complexes known as microtubule organizing centers or MTOCs. Within the MTOC, the point of origin of the microtubule is known as the minus end, while the end radiating outward is the plus end. Microtubules serve two primary functions — the organization of spindle complexes to separate sister chromatids during mitotic or meiotic cell division and the formation...
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Preparation of Segmented Microtubules to Study Motions Driven by the Disassembling Microtubule Ends
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Microtubule teardrop patterns.

Kosuke Okeyoshi1, Ryuzo Kawamura1, Ryo Yoshida2

  • 1RIKEN Advanced Science Institute, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan.

Scientific Reports
|April 1, 2015
PubMed
Summary
This summary is machine-generated.

Microtubules self-assemble into teardrop patterns using their intrinsic flexural rigidity, without motor proteins. This discovery offers new insights into the self-assembly of rigid structures in biology and beyond.

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Area of Science:

  • Biophysics
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Microtubule structures are typically controlled by associated proteins.
  • The intrinsic properties of microtubules, such as flexural rigidity, offer untapped potential for pattern formation.
  • Understanding self-assembly mechanisms is crucial for both biological and synthetic systems.

Purpose of the Study:

  • To investigate the self-assembly of microtubule patterns driven by intrinsic flexural rigidity.
  • To explore pattern formation in microtubules without the involvement of motor proteins.
  • To demonstrate a novel mechanism for microtubule pattern generation under hydrodynamic flow.

Main Methods:

  • Observation of self-assembly of parallel microtubule bundles under hydrodynamic flow.
  • Analysis of microtubule bending behavior and critical curvature.
  • Characterization of the emergent teardrop pattern.

Main Results:

  • A novel microtubule teardrop pattern was observed to emerge via self-assembly.
  • The pattern formation occurred in parallel bundles without motor proteins.
  • Microtubule bundles bent according to a critical bending curvature during growth.

Conclusions:

  • Intrinsic flexural rigidity of microtubules can drive self-assembly and pattern formation.
  • Hydrodynamic flow can induce complex patterns in microtubule structures.
  • This work expands understanding of self-assembly principles for rigid rod-like structures, applicable to biomolecules and supramolecules.