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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

Amyloid Fibrils

Amyloid Fibrils

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.
Amyloid deposits were observed as early as 1639 in the liver and the spleen. In 1854, Rudolph Virchow performed iodine staining,...

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Related Experiment Video

Updated: Mar 29, 2026

Microfluidic Mixers for Studying Protein Folding

Microfluidic Mixers for Studying Protein Folding

Published on: April 10, 2012

Membranes Do Not Tell Proteins How To Fold.

Jean-Luc Popot¹, Donald M Engelman²

¹Centre National de la Recherche Scientifique/Université Paris-7 UMR 7099 , Institut de Biologie Physico-Chimique (FRC 550), 13, rue Pierre-et-Marie-Curie, F-75005 Paris, France.

|December 10, 2015

Summary

This summary is machine-generated.

Transmembrane protein folding and oligomerization are primarily driven by intramolecular interactions, not the membrane environment. While bilayers may aid stability, they are not essential for achieving the basic three-dimensional structure of these proteins.

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Area of Science:

Biochemistry
Molecular Biology
Membrane Biophysics

Background:

Membrane proteins fold and oligomerize within lipid bilayers, suggesting the membrane environment is crucial for their structure.
The role of bilayer properties in dictating transmembrane protein topology and stability remains debated.
Biosynthetic processes may introduce asymmetry, potentially leading to metastable protein topologies.

Purpose of the Study:

To investigate which properties of the membrane environment are essential for transmembrane protein folding and oligomerization.
To determine if bilayer constraints are required for achieving the native three-dimensional structure of membrane proteins.
To evaluate the influence of translocons and biosynthetic pathways on protein topology.

Main Methods:

Review and synthesis of recent experimental data on membrane protein folding in various media.
Analysis of theoretical models concerning protein-lipid interactions and topological constraints.
Comparative assessment of folding efficiency in membrane-like versus non-membrane-like environments.

Main Results:

Many membrane proteins fold and oligomerize efficiently in environments with limited similarity to biological membranes.
Evidence suggests that bilayer properties are not essential for the fundamental three-dimensional structure of transmembrane proteins.
Intramolecular interactions appear to be the primary determinants of protein structure.

Conclusions:

The three-dimensional structure of membrane proteins is largely determined by intramolecular forces, not solely by bilayer constraints or insertion machinery.
Evolution has likely optimized membrane proteins for their environment and biosynthetic pathways, but folding is not driven by these factors.
Bilayer features may contribute to protein stability and regulation but are not prerequisites for achieving the core structure.