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Title: Tau mediates microtubule bundle architectures mimicking fascicles of microtubules found in the axon initial segment

Journal Article · · Nature Communications
DOI:https://doi.org/10.1038/ncomms12278· OSTI ID:1326678
 [1];  [1];  [1];  [1];  [1];  [2];  [1];  [1];  [1]
  1. Univ. of California, Santa Barbara, CA (United States)
  2. Korea Advanced Inst. Science and Technology (KAIST), Daejeon (Korea, Republic of). Dept. of Bio and Brain Engineering

Tau, an intrinsically disordered protein confined to neuronal axons, binds to and regulates microtubule dynamics. Although there have been observations of string-like microtubule fascicles in the axon initial segment (AIS) and hexagonal bundles in neurite-like processes in non-neuronal cells overexpressing Tau, cell-free reconstitutions have not replicated either geometry. Here we map out the energy landscape of Tau-mediated, GTP-dependent ‘active’ microtubule bundles at 37°C, as revealed by synchrotron SAXS and TEM. Widely spaced bundles (wall-to-wall distance Dw–w≈25–41nm) with hexagonal and string-like symmetry are observed, the latter mimicking bundles found in the AIS. A second energy minimum (Dw–w≈16–23nm) is revealed under osmotic pressure. The wide spacing results from a balance between repulsive forces, due to Tau’s projection domain (PD), and a stabilizing sum of transient sub-kBT cationic/anionic charge–charge attractions mediated by weakly penetrating opposing PDs. In the end, we find that this landscape would be significantly affected by charge-altering modifications of Tau associated with neurodegeneration.

Research Organization:
Univ. of California, Santa Barbara, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); National Institutes of Health (NIH)
Grant/Contract Number:
FG02-06ER46314; DMR-1401784; R01-NS13560; R01-NS35010; 2014-R1A1A2A16055715; 2011-0031931
OSTI ID:
1326678
Journal Information:
Nature Communications, Vol. 7; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 32 works
Citation information provided by
Web of Science

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Cited By (9)

Motifs in the tau protein that control binding to microtubules and aggregation determine pathological effects journal October 2017
D+ : software for high-resolution hierarchical modeling of solution X-ray scattering from complex structures text January 2019
D+ : software for high-resolution hierarchical modeling of solution X-ray scattering from complex structures text January 2019
Axonal transport: Driving synaptic function journal October 2019
The model of local axon homeostasis - explaining the role and regulation of microtubule bundles in axon maintenance and pathology journal November 2019
Tau Phosphorylation Rates Measured by Mass Spectrometry Differ in the Intracellular Brain vs. Extracellular Cerebrospinal Fluid Compartments and Are Differentially Affected by Alzheimer’s Disease journal May 2019
D+ : software for high-resolution hierarchical modeling of solution X-ray scattering from complex structures journal February 2019
Tau can switch microtubule network organizations: from random networks to dynamic and stable bundles journal January 2018
Microtubules: From understanding their dynamics to using them as potential therapeutic targets journal November 2018