Tracking single particles and elongated filaments with nanometer precision |
| |
Authors: | Ruhnow Felix Zwicker David Diez Stefan |
| |
Institution: | †B CUBE—Center of Innovation Competence, Technische Universität Dresden, Dresden, Germany;‡Max Planck Institute of Molecular Cell Biology and Genetics, Dresden, Germany;§Max Planck Institute for the Physics of Complex Systems, Dresden, Germany |
| |
Abstract: | Recent developments in image processing have greatly advanced our understanding of biomolecular processes in vitro and in vivo. In particular, using Gaussian models to fit the intensity profiles of nanometer-sized objects have enabled their two-dimensional localization with a precision in the one-nanometer range. Here, we present an algorithm to precisely localize curved filaments whose structures are characterized by subresolution diameters and micrometer lengths. Using surface-immobilized microtubules, fluorescently labeled with rhodamine, we demonstrate positional precisions of ∼2 nm when determining the filament centerline and ∼9 nm when localizing the filament tips. Combined with state-of-the-art single particle tracking we apply the algorithm 1), to motor-proteins stepping on immobilized microtubules, 2), to depolymerizing microtubules, and 3), to microtubules gliding over motor-coated surfaces. |
| |
Keywords: | |
本文献已被 ScienceDirect PubMed 等数据库收录! |
|