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Protein Folding

Protein Folding

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...

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: Feb 8, 2026

Analysis of Protein Folding, Transport, and Degradation in Living Cells by Radioactive Pulse Chase

Analysis of Protein Folding, Transport, and Degradation in Living Cells by Radioactive Pulse Chase

Published on: February 12, 2019

Modeling protein folding in vivo.

Irina Sorokina¹, Arcady Mushegian²

¹Strenic LLC, McLean, VA, 22102, USA. strenicbio@gmail.com.

|July 8, 2018

Summary

This summary is machine-generated.

Current protein folding models fail because they ignore cellular machinery. A new model proposes that the ribosome and chaperones actively guide protein folding in vivo, which is crucial for understanding protein structure.

Keywords:

Chaperone Co-translational protein folding Fast protein folding Metastable protein Motions at the peptidyl transferase center Peptide rotation Protein folding in vivo Protein folding machine Ribosome Trigger factor

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Interview: Protein Folding and Studies of Neurodegenerative Diseases

Interview: Protein Folding and Studies of Neurodegenerative Diseases

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Microfluidic Mixers for Studying Protein Folding

Microfluidic Mixers for Studying Protein Folding

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Last Updated: Feb 8, 2026

Analysis of Protein Folding, Transport, and Degradation in Living Cells by Radioactive Pulse Chase

Analysis of Protein Folding, Transport, and Degradation in Living Cells by Radioactive Pulse Chase

Published on: February 12, 2019

Interview: Protein Folding and Studies of Neurodegenerative Diseases

Interview: Protein Folding and Studies of Neurodegenerative Diseases

Published on: July 16, 2008

Microfluidic Mixers for Studying Protein Folding

Microfluidic Mixers for Studying Protein Folding

Published on: April 10, 2012

Area of Science:

Biochemistry
Molecular Biology
Computational Biology

Background:

Decades of in vitro and in silico studies have failed to yield reliable computational methods for predicting protein native conformations or folding intermediates.
Existing models overemphasize spontaneous, thermodynamically stable folding, based on limited studies of small proteins.
Empirical data suggests larger proteins require assistance for folding and are prone to irreversible denaturation in vitro, indicating metastable native states.

Purpose of the Study:

To propose a new model for protein folding that accounts for cellular machinery.
To challenge the reliance on in vitro and in silico models that assume unassisted folding.
To highlight the role of the ribosome and chaperones in guiding protein folding in vivo.

Main Methods:

Conceptual model development based on existing empirical data and biochemical principles.
Analysis of the limitations of current in vitro and in silico protein folding models.
Proposal of the "protein folding machine" concept, involving the ribosome and chaperones.

Main Results:

The "protein folding machine," particularly the ribosome and associated chaperones, actively mediates protein folding in vivo.
Cellular machinery applies forces to nascent peptides, reducing conformational entropy and facilitating rapid folding.
In vivo folding intermediates are stabilized by interactions with the ribosome and chaperones, and differ significantly from in vitro denaturation ensembles.

Conclusions:

Protein folding is not a spontaneous, thermodynamically controlled process but is actively orchestrated by cellular machinery.
In vitro experiments are limited in their ability to recapitulate in vivo folding pathways due to the absence of cellular components.
Computational modeling should shift focus from unassisted folding to reverse-engineering the in vivo folding process mediated by the protein folding machine.