Single-Molecule Localization Microscopy of 3D Orientation and Anisotropic Wobble Using a Polarized Vortex Point Spread FunctionClick to copy article linkArticle link copied!
- Tianben DingTianben DingDepartment of Electrical and Systems Engineering, Washington University in St. Louis, St. Louis, Missouri 63130, United StatesCenter for Science and Engineering of Living Systems, Washington University in St. Louis, St. Louis, Missouri 63130, United StatesMore by Tianben Ding
- Matthew D. Lew*Matthew D. Lew*Email: [email protected]. Phone: +1 (314)935 6790.Department of Electrical and Systems Engineering, Washington University in St. Louis, St. Louis, Missouri 63130, United StatesCenter for Science and Engineering of Living Systems, Washington University in St. Louis, St. Louis, Missouri 63130, United StatesInstitute of Materials Science and Engineering, Washington University in St. Louis, St. Louis, Missouri 63130, United StatesMore by Matthew D. Lew
Abstract

Within condensed matter, single fluorophores are sensitive probes of their chemical environments, but it is difficult to use their limited photon budget to image precisely their positions, 3D orientations, and rotational diffusion simultaneously. We demonstrate the polarized vortex point spread function (PSF) for measuring these parameters, including characterizing the anisotropy of a molecule’s wobble, simultaneously from a single image. Even when imaging dim emitters (∼500 photons detected), the polarized vortex PSF can obtain 12 nm localization precision, 4°–8° orientation precision, and 26° wobble precision. We use the vortex PSF to measure the emission anisotropy of fluorescent beads, the wobble dynamics of Nile red (NR) within supported lipid bilayers, and the distinct orientation signatures of NR in contact with amyloid-beta fibrils, oligomers, and tangles. The unparalleled sensitivity of the vortex PSF transforms single-molecule microscopes into nanoscale orientation imaging spectrometers, where the orientations and wobbles of individual probes reveal structures and organization of soft matter that are nearly impossible to perceive by using molecular positions alone.
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