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          Institute: MPI für molekulare Zellbiologie und Genetik     Collection: MPI-CBG Publications 2015 (arch)     Display Documents

ID: 717945.0, MPI für molekulare Zellbiologie und Genetik / MPI-CBG Publications 2015 (arch)
Impact-Free Measurement of Microtubule Rotations on Kinesin and Cytoplasmic-Dynein Coated Surfaces.
Authors:Mitra, Aniruddha; Ruhnow, Felix; Nitzsche, Bert; Diez, Stefan
Date of Publication (YYYY-MM-DD):2015
Title of Journal:PLoS ONE
Issue / Number:9
Sequence Number of Article:e0136920
Copyright:not available
Audience:Experts Only
Intended Educational Use:No
Abstract / Description:Knowledge about the three-dimensional stepping of motor proteins on the surface of microtubules (MTs) as well as the torsional components in their power strokes can be inferred from longitudinal MT rotations in gliding motility assays. In previous studies, optical detection of these rotations relied on the tracking of rather large optical probes present on the outer MT surface. However, these probes may act as obstacles for motor stepping and may prevent the unhindered rotation of the gliding MTs. To overcome these limitations, we devised a novel, impact-free method to detect MT rotations based on fluorescent speckles within the MT structure in combination with fluorescence-interference contrast microscopy. We (i) confirmed the rotational pitches of MTs gliding on surfaces coated by kinesin-1 and kinesin-8 motors, (ii) demonstrated the superiority of our method over previous approaches on kinesin-8 coated surfaces at low ATP concentration, and (iii) identified MT rotations driven by mammalian cytoplasmic dynein, indicating that during collective motion cytoplasmic dynein side-steps with a bias in one direction. Our novel method is easy to implement on any state-of-the-art fluorescence microscope and allows for high-throughput experiments.
External Publication Status:published
Document Type:Article
Version Comment:Automatic journal name synchronization
Communicated by:Thüm
Affiliations:MPI für molekulare Zellbiologie und Genetik
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