Template-assisted Filament Growth by Parallel Stacking of Tau

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 2004 Jul 9

PMID 15240881

Citations 114

Authors

Martin Margittai

Ralf Langen

Affiliations

Soon will be listed here.

Abstract

Tau filaments are found in >20 neurodegenerative diseases. Yet, because of their enormous molecular weights and poor tendency to form highly ordered 3D crystal lattices, they have evaded high-resolution structure determination. Here, we studied 25 derivatized tau mutants by using electron paramagnetic resonance and fluorescence spectroscopy to report structural details of tau filaments. Based on strong spin exchange and pyrene excimer formation of core residues, we find that individual tau proteins form single molecule layers along the fiber axis that perfectly stack on top of each other by in-register, parallel alignment of beta-strands. We suggest a model of filament growth wherein the existing filament serves as a template for the incoming, unfolded tau molecule, resulting in a new structured layer with maximized hydrogen-bonded contact surface and side-chain stacking.

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