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Protein Organization

Protein Organization

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...

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...

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Related Experiment Video

Updated: Jul 28, 2026

Microfluidic Mixers for Studying Protein Folding

Microfluidic Mixers for Studying Protein Folding

Published on: April 10, 2012

Nature's Shortcut to Protein Folding.

Fernando Bergasa-Caceres¹, Elisha Haas², Herschel A Rabitz³

¹Universidad Autonoma de Madrid , Cantoblanco 28049 , Spain.

The Journal of Physical Chemistry. B

|March 23, 2019

Summary

Nature's Shortcut hypothesis suggests nonlocal contacts in protein sequences enable efficient folding. This protein folding mechanism, supported by experimental data, bypasses random search for complex structures.

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Area of Science:

Biophysics
Computational Biology
Molecular Biology

Background:

Protein folding is crucial for biological function.
The process of achieving a specific 3D structure from a linear sequence is complex.
For proteins >100 amino acids, an unaided search for the native structure is computationally challenging.

Purpose of the Study:

To present and support the "Nature's Shortcut" hypothesis for protein folding.
To propose that early establishment of nonlocal contacts (protein loops) guides folding.
To unify experimental and theoretical models of protein folding.

Main Methods:

Experimental testing of the loop hypothesis (LH) using time-resolved Förster resonance energy transfer (TR-FRET).
Application of the sequential collapse model (SCM) for theoretical predictions.
Utilizing primary sequence information to predict key nonlocal contacts.

Main Results:

Experimental data for adenylate kinase are consistent with the LH and SCM predictions.
The loop hypothesis (LH) and sequential collapse model (SCM) offer a unified view of protein folding.
The SCM successfully predicts critical nonlocal contacts from primary sequence data.

Conclusions:

Nature's Shortcut, mediated by nonlocal contacts, provides an efficient pathway for protein folding.
The proposed mechanism bypasses the need for an exhaustive search of conformational space.
This framework offers a testable model for understanding and predicting protein folding pathways.