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Protein Folding

Protein Folding

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.
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...

Protein Folding

Protein Folding

Protein Folding

Protein Folding

Molecular Chaperones and Protein Folding

Molecular Chaperones and Protein Folding

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 Quality Check in the RER

Protein Folding Quality Check in the RER

ER is the primary site for the maturation and folding of soluble and transmembrane secretory proteins. The calnexin cycle is a specific chaperone system that folds and assesses the confirmation of N-glycosylated proteins before they can exit the ER lumen. The primary players of this quality check pipeline are the lectins, ER-resident chaperones, and a glucosyl transferase enzyme. In case the calnexin system in the lumen fails to salvage a misfolded protein, it is transported to the cytoplasm...

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Related Experiment Video

Updated: Mar 22, 2026

Thermodynamics of Membrane Protein Folding Measured by Fluorescence Spectroscopy

Thermodynamics of Membrane Protein Folding Measured by Fluorescence Spectroscopy

Published on: April 28, 2011

Proteins Take up Water Before Unfolding.

Carien C M Groot¹, Huib J Bakker¹

¹FOM institute AMOLF, Science Park 104, 1098 XG Amsterdam, The Netherlands.

The Journal of Physical Chemistry Letters

|April 28, 2016

Summary

Protein unfolding begins with structural loosening, allowing water penetration. This study monitored water dynamics to reveal early changes in protein structure during denaturation.

Area of Science:

Biophysics
Structural Biology
Physical Chemistry

Background:

Protein function is dictated by its 3D structure.
Protein structure is influenced by interactions with water.
Urea is a common denaturant used to study protein unfolding.

Purpose of the Study:

To investigate water dynamics around proteins during unfolding.
To correlate water-exposed surface area with protein structural changes.
To understand the initial events in urea-induced protein unfolding.

Main Methods:

Polarization-resolved femtosecond infrared spectroscopy was used.
Studied aqueous solutions of globular proteins.
Monitored changes in water dynamics at varying urea concentrations.

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Thermodynamics of Membrane Protein Folding Measured by Fluorescence Spectroscopy

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Main Results:

A fraction of water molecules exhibited slowed dynamics due to protein interaction.
The slow water fraction directly correlates with the water-exposed protein surface.
A ~50% increase in water-exposed surface area was observed at mild denaturing conditions.
This increase occurred while secondary protein structure remained intact.

Conclusions:

Protein unfolding initiates with a less compact structure, facilitating water entry.
Water dynamics serve as a sensitive probe for early-stage protein unfolding.
The study provides insights into the mechanism of protein denaturation.