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Molecular Chaperones and Protein Folding03:00

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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.
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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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Amyloid fibrils are aggregates of misfolded proteins.  Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils. 
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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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The ER is the hub of protein synthesis in a cell. It has robust systems to quality control protein folding and also for degradation of terminally misfolded proteins. Under normal conditions, a small proportion of misfolded proteins that cannot be salvaged need to be transported to the cytoplasm by the ER-associated degradation or ERAD pathways. However, if the ERAD cannot handle the misfolded proteins, the cell activates the unfolded protein response or UPR to adjust the protein folding...
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Updated: Jun 9, 2025

How to Stabilize Protein: Stability Screens for Thermal Shift Assays and Nano Differential Scanning Fluorimetry in the Virus-X Project
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Optimal strategy for stabilizing protein folding intermediates.

Mengshou Wang1, Liangrong Peng2, Baoguo Jia3

  • 1School of Mathematics, Sun Yat-sen University, Guangzhou 510275, China.

The Journal of Chemical Physics
|October 25, 2024
PubMed
Summary
This summary is machine-generated.

This study reveals that optimal protein stabilization strategies using chemical additives follow a bang-bang control approach for linear addition. This provides efficient methods for enhancing protein stability in various applications.

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Area of Science:

  • Biochemistry and Biophysics
  • Chemical Engineering
  • Pharmacology

Background:

  • Protein stability is crucial for structure analysis, folding kinetics, and functionality, with wide applications in medicine and industry.
  • Minimizing stabilizer usage is important due to potential side effects and costs.
  • Optimal strategies for protein stabilization are needed to enhance stability efficiently.

Purpose of the Study:

  • To determine optimal control strategies for stabilizing protein folding intermediates using chemical stabilizers.
  • To analytically derive the optimal switching time for linear stabilizer addition strategies.
  • To apply these findings to real-world examples, such as erythropoietin stabilization.

Main Methods:

  • Mathematical modeling of protein folding kinetics under stabilizer influence.
  • Derivation of optimal control strategies, specifically bang-bang controls for linear stabilizer addition.
  • Analytical exploration of switching times and phase diagrams.
  • Experimental application to erythropoietin stabilization with various chemicals.

Main Results:

  • Optimal control strategy for linear stabilizer addition is a bang-bang control.
  • Analytical solutions for optimal switching times were derived and analyzed through phase diagrams.
  • Nonlinear stabilizer addition strategies were shown to break the bang-bang control.
  • The theory was successfully applied to stabilize erythropoietin using ten different chemicals.

Conclusions:

  • The study provides a theoretical framework for optimal protein stabilization using minimal chemical stabilizers.
  • Bang-bang control strategies offer an efficient method for stabilizing protein folding intermediates.
  • Findings offer practical guidance for selecting and using stabilizers in medicine and industry.
  • This research deepens the understanding of protein folding kinetics and informs treatments for protein-related diseases.