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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...

Pinching-off of Coated Vesicles

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Vesicle budding is orchestrated by distinct cytosolic proteins such as adaptor proteins, coat proteins, and GTPases. To initiate vesicle budding, membrane-bending proteins containing crescent-shaped BAR domains bind to the lipid heads in the bilayer and distort the membrane to form a protein-coated vesicle bud. Adaptors proteins such as AP2 for clathrin-coated vesicles can nucleate on the deformed membrane. Finally, coat proteins such as clathrin or COPI and COPII assemble into a coat forming...

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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...

Coat Assembly and GTPases

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Vesicles incorporate different coat protein subunits in different cell locations, which changes the properties of the coat, such as the shape and geometry of the transport vesicles. Thus, vesicle coat proteins also play a significant role in cargo selection.
Coat assembly depends on the local availability of phosphatidylinositol phosphates or PIPs and GTP-binding proteins. Adaptor proteins, which link the coat proteins to the membrane, bind to these PIPs and play a crucial role in controlling...

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Clathrin-coated vesicles use endocytosis to transport receptors and lysosomal hydrolases from the Golgi to the lysosome in the late secretory pathway. Clathrin-mediated endocytosis was the first described endocytic process, and Clathrin-coated vesicles remain one of the most well-studied transport vesicles. The molecular machinery that generates clathrin-coated vesicles comprises over 50 proteins that precisely coordinate vesicle formation. Cell surface receptors concentrated in indented sites...

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Related Experiment Video

Updated: Jun 8, 2026

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

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Published on: September 2, 2019

Opening up the group II chaperonins.

¹Laboratory of Structural Biology, Tsinghua University, Beijing 100084, China. raozh@xtal.tsinghua.edu

Structure (London, England : 1993)

|October 16, 2010

Summary

This summary is machine-generated.

Researchers revealed the crystal structure of a group II chaperonin in its open state. This provides detailed insights into protein folding mechanisms facilitated by chaperonins.

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Area of Science:

Structural biology
Biochemistry
Molecular biology

Background:

Chaperonins are essential molecular machines that assist protein folding.
Understanding the mechanism of chaperonin-mediated protein folding is crucial for cell biology.

Discussion:

The study presents the crystal structure of a group II chaperonin in an open conformation.
This structure reveals dynamic domain movements triggered by ATP hydrolysis.
It offers a detailed view of the chaperonin's mechanism in assisting protein folding.

Key Insights:

Detailed visualization of domain rearrangements in group II chaperonins.
Elucidation of the role of ATP hydrolysis in chaperonin conformational changes.
Enhanced understanding of the protein folding pathway facilitated by these molecular machines.

Outlook:

Further structural studies of chaperonins in different functional states.
Investigating the role of chaperonins in protein quality control and disease.
Exploring the potential of targeting chaperonins for therapeutic interventions.