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Mechanical Protein Functions

Mechanical Protein Functions

Proteins perform many mechanical functions in a cell. These proteins can be classified into two general categories- proteins that generate mechanical forces and proteins that are subjected to mechanical forces. Proteins providing mechanical support to the structure of the cell, such as keratin, are subjected to mechanical force, whereas proteins involved in cell movement and transport of molecules across cell membranes, such as an ion pump, are examples of generating mechanical force.

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The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
The...

Molecular Chaperones and Protein Folding

Molecular Chaperones and Protein Folding

Protein Folding

Protein Folding

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Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
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Related Experiment Video

Updated: Nov 19, 2025

Measurement of Force-Sensitive Protein Dynamics in Living Cells Using a Combination of Fluorescent Techniques

Measurement of Force-Sensitive Protein Dynamics in Living Cells Using a Combination of Fluorescent Techniques

Published on: November 2, 2018

Mechanobiology: protein refolding under force.

Ionel Popa¹, Ronen Berkovich^2,3

¹Department of Physics, University of Wisconsin-Milwaukee, 3135 North Maryland Ave., Milwaukee, WI 53211, U.S.A.

Emerging Topics in Life Sciences

|February 3, 2021

Summary

This summary is machine-generated.

Protein refolding under force shows complex dynamics, involving elastic recoil, extension plateau, and collapse for native structure maturation. Understanding this is key for mechanotransducing proteins.

Keywords:

Brownian dynamics simulations collapse free energy landscape molecular dynamics simulations refolding single-molecule force spectroscopy

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Area of Science:

Biophysics
Protein Dynamics
Mechanobiology

Background:

Direct force application probes protein energy landscapes via conformational changes like unfolding and refolding.
Protein unfolding under force is typically two-state, but refolding exhibits complex, multi-phase behavior.

Purpose of the Study:

To review the fundamental concepts of protein refolding dynamics under constant force.
To elucidate the mechanisms governing protein refolding crucial for mechanotransducing protein function.

Main Methods:

Analysis of force-quench experiments detailing protein refolding steps.
Modeling protein refolding using one-dimensional and two-dimensional free energy landscapes.

Main Results:

Protein refolding involves an initial elastic recoil, an extension plateau, and a final collapse for native structure formation.
The polymeric chain collapse is essential for mature native protein structure.
Two-dimensional energy surfaces offer deeper insights into refolding dynamics than 1D models, especially at low forces.

Conclusions:

Protein refolding under force is a complex process requiring full polymeric chain collapse for native structure maturation.
Understanding these force-induced refolding dynamics is vital for comprehending in vivo mechanotransduction.