Molecular Motor Biophysics
Molecular Motor Biophysics - Related Videos
06:08
Biophysical Characterization of Flagellar Motor Functions
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Cited by 8 •
2017
Recent findings suggest that bacterial flagellar motors sense a variety of environmental signals and remodel in response. The bead-assays discussed here are expected to help explain the role of remodeling in cellular adaptation to environmental stressors.
08:40
Light-driven Molecular Motors on Surfaces for Single Molecular Imaging
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Cited by 1 •
2019
The manuscript describes how to synthesize and graft a molecular motor on surfaces for single molecular imaging.
15:53
Isolation and Biophysical Study of Fruit Cuticles
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Cited by 16 •
2012
Aerial plant organs are protected by the cuticle, a supramolecular biopolyester-wax assembly. We present protocols to monitor selective removal of epi- and intracuticular waxes from tomato fruit cuticles on molecular and micro scales by solid-state NMR and atomic force microscopy, respectively, and to assess the cross-linking capacity of engineered cuticular biopolyesters.
11:43
Concentric Gel System to Study the Biophysical Role of Matrix Microenvironment on 3D Cell Migration
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Cited by 7 •
2015
The mechanical properties and microstructure of the extracellular matrix strongly affect 3D migration of cells. An in vitro method to study the spatiotemporal cell migration behavior in biophysically variable environments, at both population and individual cell levels, is described.
11:09
Characterizing the Composition of Molecular Motors on Moving Axonal Cargo Using "Cargo Mapping" Analysis
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Cited by 8 •
2014
Intracellular transport of cargoes, such as vesicles or organelles, is carried out by molecular motor proteins that track on polarized microtubules. This protocol describes the correlation of the directionality of transport of individual cargo particles moving inside neurons, to the relative amount and type of associated motor proteins.
FAQs
ATP hydrolysis supplies chemical energy that drives conformational changes in motor proteins. Those structural shifts are coupled to interactions with cytoskeletal tracks or contractile assemblies, allowing the motor to generate force and mechanical displacement. Molecular motor biophysics examines this coupling to determine how chemical reactions become directed motion rather than simply measuring ATP consumption.
An attached cargo or another mechanical constraint can oppose motor movement, making load response a central property to measure. Researchers assess how motors produce force, alter their stepping behavior, and use chemical energy under different mechanical demands. These measurements also help evaluate energy efficiency, linking molecular performance with the physical requirements of intracellular transport and organization.
Kinesin, dynein, and myosin represent distinct protein-machine systems that can be examined through their movement along cytoskeletal tracks or within contractile assemblies. Comparing these motors helps researchers identify general principles of ATP-powered force generation while recognizing that motor behavior depends on its molecular architecture and operating context. Such comparisons connect nanoscale mechanics with diverse cellular functions.
A study may combine single-molecule imaging, optical trapping, direct force measurements, and mathematical modeling. Imaging reveals individual movement, while optical trapping and force assays characterize mechanical output under controlled conditions. Models then organize observations of stepping, transport, load response, and energy efficiency, producing a quantitative account of how a motor performs its task.
Single-molecule imaging follows the behavior of individual motor proteins or motor-associated cargo, whereas optical trapping applies or measures mechanical forces during that behavior. Used together, these approaches connect visible steps with the forces that produce them. The resulting measurements help distinguish movement patterns from load-dependent changes and support quantitative analysis of motor transport.
The field explains how cells organize cargo, divide, move, and maintain structure through controlled nanoscale mechanics. Its findings provide context for studying neurodegeneration and muscle disorders, where motor-dependent organization or force generation may be relevant. The same principles also support biomolecular engineering and the design of synthetic molecular machines that emulate biological energy-to-motion conversion.