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Related Experiment Video

Updated: Jan 30, 2026

Dissecting Mechanoenzymatic Properties of Processive Myosins with Ultrafast Force-Clamp Spectroscopy

Dissecting Mechanoenzymatic Properties of Processive Myosins with Ultrafast Force-Clamp Spectroscopy

Published on: July 1, 2021

Transformation of the Nonprocessive Fast Skeletal Myosin II into a Processive Motor.

Mamta Amrute-Nayak¹, Arnab Nayak¹, Walter Steffen¹

¹Institute of Molecular and Cell Physiology, Hannover Medical School, D-30625, Hannover, Germany.

Small (Weinheim an Der Bergstrasse, Germany)

|January 19, 2019

Summary

Replacing a regulatory light chain in myosin motors transforms a non-processive motor into a processive one. This myosin motor engineering enhances actin-binding rates and duty ratio, enabling new biohybrid machines.

Keywords:

myosin II optical trapping processivity single molecule studies total internal reflection fluorescence (TIRF) microscopy

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Probing Myosin Ensemble Mechanics in Actin Filament Bundles Using Optical Tweezers

Probing Myosin Ensemble Mechanics in Actin Filament Bundles Using Optical Tweezers

Published on: May 4, 2022

Area of Science:

Biochemistry
Molecular Biology
Biophysics

Background:

Myosin motors are essential for cellular functions.
The role of light chains in myosin motor variability is not fully understood.

Purpose of the Study:

To investigate how regulatory light chains influence myosin motor function.
To engineer a processive myosin motor by light chain replacement.

Main Methods:

Single molecule kinetic analyses.
Optical trapping measurements.
Myosin motor functional assays.

Main Results:

Replacing the regulatory light chain MLC2f with MLC2v transformed MHC-IID into a processive motor.
The hybrid motor exhibited a twofold increase in association rates with actin and adenosine triphosphate (ATP).
The regulatory light chain variant MLC2v modulated the duty ratio and actomyosin association time.

Conclusions:

Regulatory light chains fine-tune myosin motor mechanical output.
This study demonstrates the potential for engineering myosin motors for specialized applications.
The findings have implications for understanding myosin function in physiological conditions and developing biohybrid machines.