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Related Experiment Video

Updated: Jun 14, 2026

Myosin-Specific Adaptations of In vitro Fluorescence Microscopy-Based Motility Assays

Myosin-Specific Adaptations of In vitro Fluorescence Microscopy-Based Motility Assays

Published on: February 4, 2021

Myosin filament depolymerizes in a low ionic strength solution containing L-histidine.

T Hayakawa¹, T Ito, J Wakamatsu

¹Meat Science Laboratory, Graduate School of Agriculture, Hokkaido University, N-9, W-9, Kita-ku, Sapporo, Hokkaido 060-8589, Japan. t-haya@anim.agr.hokudai.ac.jp

|April 9, 2010

Summary

L-histidine solubilizes myosin by affecting its filament formation. This amino acid elongates the light meromyosin region, weakening myosin filaments and aiding dissociation in low ionic strength solutions.

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Area of Science:

Biochemistry
Molecular Biology
Structural Biology

Background:

Myosin, a key myofibrillar protein, typically forms insoluble filamentous polymers.
Solubility challenges limit myosin's study and application in physiological and low ionic strength solutions.

Purpose of the Study:

To investigate the role of L-histidine in myosin solubilization.
To elucidate the effects of L-histidine on myosin filament formation and morphology at low ionic strength.

Main Methods:

Investigated myosin solubility in low ionic strength solutions with L-histidine.
Analyzed myosin filament formation and morphology under varying ionic strengths and L-histidine presence.
Utilized transmission electron microscopy to examine the light meromyosin (LMM) region.

Main Results:

Myosin solubility was achieved in low ionic strength solutions supplemented with L-histidine.
L-histidine induced myosin filament formation in physiological ionic strength but dispersion in low ionic strength.
Transmission electron microscopy revealed LMM elongation in low ionic strength solutions containing L-histidine.

Conclusions:

L-histidine facilitates myosin solubilization by altering filament assembly dynamics.
The observed elongation of the LMM region weakens myosin filaments, promoting dissociation in low ionic strength environments.
L-histidine represents a potential tool for manipulating myosin structure and solubility.