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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

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...

Conservation of Protein Domains Over Different Proteins

Conservation of Protein Domains Over Different Proteins

Protein domains are small structurally independent units that are part of a single amino acid chain. Although these domains are often structurally independent, they may rely on synergistic effects to perform their functions as part of a larger protein. Protein domains may be conserved within the same organism, as well as across different organisms.
A limited set of protein domains often duplicate and recombine during evolution. These domains can be organized in different combinations to...

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Related Experiment Video

Updated: Jan 19, 2026

Protein WISDOM: A Workbench for In silico De novo Design of BioMolecules

Protein WISDOM: A Workbench for In silico De novo Design of BioMolecules

Published on: July 25, 2013

Improving folding properties of computationally designed proteins.

Benjamin Bjerre¹, Jakob Nissen¹, Mikkel Madsen¹

¹The Linderstrøm-Lang Centre for Protein Science, Section for Biomolecular Sciences, Department of Biology, University for Copenhagen, Ole Maaloes Vej 5, DK-2200 Copenhagen N, Denmark.

Protein Engineering, Design & Selection : PEDS

|September 26, 2019

Summary

Computational protein design faces challenges with protein folding. A new genetics-based assay identifies single amino acid changes that significantly improve the folding and stability of designed proteins.

Keywords:

circular permutation folding sensor genetic selection protein design protein folding

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Application of I TASSER, trRosetta, UCSF Chimera, HADDOCK server, and HEX loria for De Novo and In Silico Design of Proteins

Application of I TASSER, trRosetta, UCSF Chimera, HADDOCK server, and HEX loria for De Novo and In Silico Design of Proteins

Published on: July 8, 2025

Area of Science:

Protein Engineering
Computational Biology
Biochemistry

Background:

Computational protein design has advanced significantly, but achieving desired folding properties remains a challenge for creating novel and larger proteins.
Assessing and enhancing the folding characteristics of computationally designed proteins is crucial for their practical application.

Purpose of the Study:

To develop a novel genetics-based system for assessing and selecting protein designs with improved folding properties.
To identify specific amino acid substitutions that can rescue or enhance the folding and stability of designed proteins.

Main Methods:

Developed a genetics-based folding assay and selection system using orotate phosphoribosyl transferase from Escherichia coli.
Screened candidate designs for favorable folding properties and genetically selected for improved designs.
Identified and transferred beneficial single amino acid substitutions into existing protein designs.

Main Results:

Identified single amino acid substitutions that rescued poorly folding and unstable protein designs.
Transferred substitutions into a complex protein design, resulting in native-like cooperative folding and enhanced stability.
Demonstrated that individual amino acid modifications can critically impact protein folding and stability.

Conclusions:

The developed genetics-based system provides a powerful platform for identifying and improving protein designs with superior folding properties.
Single amino acid substitutions can dramatically influence the folding behavior and stability of designed proteins.
This approach facilitates the creation of more robust and functional engineered proteins.