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Mechanical splitting of microtubules into protofilament bundles by surface-bound kinesin-1

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep39408· OSTI ID:1339254
 [1];  [2];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Center for Integrated Nanotechnologies
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Center for Integrated Nanotechnologies
The fundamental biophysics of gliding microtubule (MT) motility by surface-tethered kinesin-1 motor proteins has been widely studied, as well as applied to capture and transport analytes in bioanalytical microdevices. In these systems, phenomena such as molecular wear and fracture into shorter MTs have been reported due the mechanical forces applied on the MT during transport. In the present work, we show that MTs can be split longitudinally into protofilament bundles (PFBs) by the work performed by surface-bound kinesin motors. We examine the properties of these PFBs using several techniques (e.g., fluorescence microscopy, SEM, AFM), and show that the PFBs continue to be mobile on the surface and display very high curvature compared to MT. Further, higher surface density of kinesin motors and shorter kinesin-surface tethers promote PFB formation, whereas modifying MT with GMPCPP or higher paclitaxel concentrations did not affect PFB formation.
Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC04-94AL85000; AC52-06NA25396; SC0001035
OSTI ID:
1339254
Report Number(s):
SAND2017--0052J; srep39408
Journal Information:
Scientific Reports, Journal Name: Scientific Reports Vol. 6; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (8)

High-Resolution Imaging of a Single Gliding Protofilament of Tubulins by HS-AFM journal July 2017
USP21 modulates Goosecoid function through deubiquitination journal July 2019
Microtubules: From understanding their dynamics to using them as potential therapeutic targets journal November 2018
Curvature-Sensitive Kinesin Binding Can Explain Microtubule Ring Formation and Reveals Chaotic Dynamics in a Mathematical Model journal September 2018
Kinesin expands and stabilizes the GDP-microtubule lattice journal March 2018
Non-equilibrium assembly of microtubules: from molecules to autonomous chemical robots journal January 2017
The model of local axon homeostasis - explaining the role and regulation of microtubule bundles in axon maintenance and pathology journal November 2019
Curvature-sensitive kinesin binding can explain microtubule ring formation and reveals chaotic dynamics in a mathematical model preprint January 2018

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