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Myosin-Specific Adaptations of In vitro Fluorescence Microscopy-Based Motility Assays
Published on: February 4, 2021
Motor-substrate interactions in mycoplasma motility explains non-Arrhenius temperature dependence
Jing Chen1, John Neu, Makoto Miyata
1Biophysics Graduate Group, University of California, Berkeley, California, USA.
Biophysical Journal
|December 2, 2009
Summary
Mycoplasmas use "leg" proteins for gliding motility, with velocity highly sensitive to temperature. A novel leg-substrate interaction model explains this temperature dependence, applicable to other molecular motors.
Area of Science:
- Microbiology
- Biophysics
- Molecular Biology
Background:
- Mycoplasmas possess a unique gliding motility mechanism.
- This motility is powered by approximately 400
Purpose of the Study:
- To propose a leg-substrate interaction mechanism.
- To explain the temperature sensitivity of Mycoplasma gliding motility.
Main Methods:
- Analysis of load-velocity curves at varying temperatures.
- Development of a theoretical model for leg-substrate interaction.
Main Results:
- Cell velocity increases 10-fold between 10-40°C.
- A temperature-insensitive force-generation mechanism near stall was observed.
- The model explains temperature sensitivity via multiple energy barriers and temperature-sensitive leg release.
Conclusions:
- The proposed model elucidates Mycoplasma motility's temperature dependence.
- This mechanism may explain similar behaviors in other molecular motors like kinesin and myosin.
- Motor-substrate interactions, not just biochemistry, significantly influence temperature-velocity relationships.
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