Title

Revealing Conformational Variants of Solution-Phase Intrinsically Disordered Tau Protein at the Single-Molecule Level

Document Type

Article

Publication Date

11-14-2017

Keywords

Biophysics, Fluorescence spectroscopy, Microfluidics, Protein structures, Single-molecule studies

Organizational Units

College of Natual Science and Mathematics, Chemistry and Biochemistry

Abstract

Intrinsically disordered proteins, such as tau protein, adopt a variety of conformations in solution, complicating solution‐phase structural studies. We employed an anti‐Brownian electrokinetic (ABEL) trap to prolong measurements of single tau proteins in solution. Once trapped, we recorded the fluorescence anisotropy to investigate the diversity of conformations sampled by the single molecules. A distribution of anisotropy values obtained from trapped tau protein is conspicuously bimodal while those obtained by trapping a globular protein or individual fluorophores are not. Time‐resolved fluorescence anisotropy measurements were used to provide an explanation of the bimodal distribution as originating from a shift in the compaction of the two different families of conformations.

Publication Statement

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