Cited by 58Microtubule and mitosis dynamicsElectrostatics and Colloid InteractionsProtein Structure and Dynamics

Transitions in microtubule C-termini conformations as a possible dendritic signaling phenomenon

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Priel, Avner, Tuszynski, Jack A., Woolf, Nancy J.·2005·European Biophysics Journal

Abstract

We model the dynamical states of the C-termini of tubulin dimers that comprise neuronal microtubules. We use molecular dynamics and other computational tools to explore the time-dependent behavior of conformational states of a C-terminus of tubulin within a microtubule and assume that each C-terminus interacts via screened Coulomb forces with the surface of a tubulin dimer, with neighboring C-termini and also with any adjacent microtubule-associated protein 2 (MAP2). Each C-terminus can either bind to the tubulin surface via one of the several positively charged regions or can be allowed to explore the space available in the solution surrounding the dimer. We find that the preferential orientation of each C-terminus is away from the tubulin surface but binding to the surface may also take place, albeit at a lower probability. The results of our model suggest that perturbations generated by the C-termini interactions with counterions surrounding a MAP2 may propagate over distances greater than those between adjacent microtubules. Thus, the MAP2 structure is able to act as a kind of biological wire (or a cable) transmitting local electrostatic perturbations resulting in ionic concentration gradients from one microtubule to another. We briefly discuss the implications the current dynamic modeling may have on synaptic activation and potentiation.

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  • This wave is predicted to travel as a 'kink' solitary wave with a phase velocity of vph = 2 nm/ps.

    “This wave is predicted to travel as a “kink” solitary wave with a phase velocity of vph = 2 nm/ps [97].”
  • Computer simulations demonstrate that ionic waves can trigger C-termini to change from upright to downward conformations initiating propagation of a travelling wave.

    “Computer simulations demonstrate that ionic waves can trigger C-termini to change from upright to downward conformations initiating propagation of a travelling wave [97].”

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  1. Dustin, P. 1984. Microtubules. Springer-Verlag, Berlin.

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Authors
Priel, A., Tuszynski, J. A., & Woolf, N. J.
Affiliations
  • University of Alberta (CA)
  • University of California, Los Angeles (US)
Venue
European Biophysics Journal
Published
2005-09-24
Volume
35
Issue
1
Pages
40-52
ISSN
  • 0175-7571 (ISSN-L)
  • 1432-1017
OpenAlex
W2003477962
Cited by
57
References
27
Citations by year
2025: 3 · 2024: 2 · 2023: 1 · 2021: 1 · 2020: 5 · 2019: 3 · 2018: 2 · 2016: 2 · 2014: 6 · 2013: 2 · 2012: 4
FWCI
0.82
Type
journal article
Language
en
Open access
Locations
  • European Biophysics Journal (publishedVersion)
  • PubMed (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • arXiv (Cornell University)
Funders
  • National Institutes of Health
  • Natural Sciences and Engineering Research Council of Canada
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Microtubule and mitosis dynamics
  • Physical Sciences › Chemistry › Physical and Theoretical Chemistry › Electrostatics and Colloid Interactions
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Structure and Dynamics
Keywords
tubulin dimers, MAP2, dendritic signaling, electrostatic interactions, Coulomb screening, ion gradients, microtubule dynamics, synaptic potentiation, neuronal microtubules
MeSH terms
Dendrites, Humans, Microtubule-Associated Proteins, Microtubules, Molecular Conformation, Protein Binding, Species Specificity, Time Factors, Tubulin, Signal Transduction, Dimerization, Static Electricity

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