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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

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...

Bacterial Protein Maturation

Bacterial Protein Maturation

Bacterial protein maturation is a tightly regulated process that ensures newly synthesized polypeptides achieve correct functional conformations. This maturation involves a series of modifications, folding events, and quality control steps, often assisted by specialized chaperone proteins.N-Terminal ModificationsThe maturation of bacterial polypeptides begins cotranslationally as the polypeptide exits the ribosome. The first amino acid, N-formylmethionine (fMet), is typically modified at the...

Energy to Drive Translocation

Energy to Drive Translocation

Mitochondrial protein import is powered by two distinct energy sources: ATP hydrolysis and electrochemical potential across the inner membrane. Newly synthesized precursors are bound by cytosolic chaperones of the Hsp70 family, which guide them to the import receptors on the mitochondrial surface. Utilizing the energy of ATP hydrolysis, Hsp70 chaperones transfer these precursors to the TOM receptors on the mitochondrial outer membrane.
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Mechanical Protein Functions

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Proteins perform many mechanical functions in a cell. These proteins can be classified into two general categories- proteins that generate mechanical forces and proteins that are subjected to mechanical forces. Proteins providing mechanical support to the structure of the cell, such as keratin, are subjected to mechanical force, whereas proteins involved in cell movement and transport of molecules across cell membranes, such as an ion pump, are examples of generating mechanical force.

Protein Complex Assembly

Protein Complex Assembly

Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types. Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
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Related Experiment Video

Updated: May 9, 2026

In Situ Monitoring of Transiently Formed Molecular Chaperone Assemblies in Bacteria, Yeast, and Human Cells

In Situ Monitoring of Transiently Formed Molecular Chaperone Assemblies in Bacteria, Yeast, and Human Cells

Published on: September 2, 2019

ATP-driven molecular chaperone machines.

Daniel K Clare¹, Helen R Saibil

¹Department of Crystallography, Institute of Structural and Molecular Biology, Birkbeck College, University of London, Malet Street, London WC1E 7HX, UK.

|July 24, 2013

Summary

This review explores how ATP binding and hydrolysis power molecular chaperones like Hsp60 GroEL to assist protein folding and unfolding. Cryo-EM reveals GroEL

Keywords:

ATP driven Cryo-EM GroEL chaperones machines

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Area of Science:

Molecular Biology
Biochemistry
Structural Biology

Background:

Molecular chaperones are essential for protein homeostasis, assisting in protein folding and unfolding.
Key chaperone families include Hsp70, Hsp90, Hsp100, and Hsp60.

Purpose of the Study:

To review the mechanisms of ATP-driven chaperone machines in protein folding and unfolding.
To detail the function of the Hsp60 chaperonin machine, specifically E. coli GroEL.

Main Methods:

Literature review of general chaperone systems (Hsp70, Hsp90, Hsp100).
Focus on the Hsp60 chaperonin machine.
Cryo-electron microscopy (Cryo-EM) analysis of E. coli Hsp60 GroEL.

Main Results:

Cryo-EM revealed intermediate conformations in the ATPase cycle and substrate folding of GroEL.
These structures suggest a mechanism for GroEL to unfold substrates and encapsulate them for folding.

Conclusions:

ATP binding and hydrolysis are central to chaperone machine function.
GroEL utilizes a mechanism of forceful unfolding and isolated encapsulation for protein folding.