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Area of Science:

  • Neuroscience
  • Biophysics
  • Computational Biology

Background:

  • Tau is a crucial microtubule-associated protein for neuronal function.
  • Tau's disordered nature and multivalent binding present structural characterization challenges.
  • Electrostatic interactions govern tau's dynamic behavior with microtubules.

Purpose of the Study:

  • Investigate tau-microtubule (MT) interactions using simulations.
  • Understand how tau's multivalent binding is regulated at the sub-regional level.
  • Explore the impact of isoform variation and phosphorylation on tau-MT binding.

Main Methods:

  • Coarse-grained molecular dynamics simulations.
  • Modeling tau interactions with tubulin C-terminal tails and structured surfaces.
  • Analyzing electrostatic contributions to binding affinity and dynamics.

Main Results:

  • Distinct tau sub-regions differentially contribute to tubulin binding.
  • Isoform variations modulate tau-MT interactions and influence MT stability.
  • Alzheimer's-associated phosphorylation weakens tau's multivalent engagement with MTs.

Conclusions:

  • Electrostatics and sub-regional composition dynamically regulate tau-MT interactions.
  • Findings offer mechanistic insights into tauopathy and neuronal dysfunction.
  • Tau's interaction with microtubules is sensitive to phosphorylation and isoform structure.