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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.
Generally, polypeptides are unfolded by two distinct...

Export of Misfolded Proteins out of the ER

Export of Misfolded Proteins out of the ER

After folding, the ER assesses the quality of secretory and membrane proteins. The correctly folded proteins are cleared by the calnexin cycle for transport to their final destination, while misfolded proteins are held back in the ER lumen. The ER chaperones attempt to unfold and refold the misfolded proteins but sometimes fail to achieve the correct native conformation. Such terminally misfolded proteins are then exported to the cytosol by ER-associated degradation or ERAD pathway for...

Protein Transport to the Stroma

Protein Transport to the Stroma

Chloroplasts are triple membrane structures with an outer membrane, an inner membrane, and a thylakoid membrane, each containing distinct metabolite transporters, membrane translocons, and enzymes. Appropriate sorting and translocating these proteins to their correct membrane systems is essential for chloroplast function.
Protein complexes called the translocon of the outer chloroplast membrane or TOC complex, and the translocon of the inner chloroplast membrane or TIC complex mediate the...

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Related Experiment Video

Updated: Jul 4, 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

Hsp70: a chaperokine.

Alexzander Asea¹

¹Division of Investigative Pathology, Scott & White Clinic and Texas A & M University System Health Science Center, College of Medicine, 1901 South 1st Street, Temple, TX 76508, USA.

Novartis Foundation Symposium

|June 26, 2008

Summary

Heat shock protein 72 (Hsp72) acts as a chaperokine, exhibiting dual intracellular cytoprotective and extracellular cytostimulatory roles. Extracellular Hsp72 enhances anti-tumor immunity and is being explored for novel therapeutic applications.

Area of Science:

Immunology
Cell Biology
Biochemistry

Background:

Heat shock proteins (HSPs), particularly Hsp72, have known intracellular cytoprotective functions.
Extracellular roles of Hsp72 are emerging, suggesting a dual function as both chaperone and cytokine (chaperokine).

Purpose of the Study:

To elucidate the mechanisms of extracellular Hsp72 chaperokine activity.
To discuss the biological significance of extracellular Hsp72.
To explore therapeutic applications of Hsp72 chaperokine activity.

Main Methods:

Review of recent scientific literature on Hsp72.
Analysis of studies investigating extracellular Hsp72 signaling pathways.
Examination of research on therapeutic agent development.

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Escherichia coli -Based Complementation Assay to Study the Chaperone Function of Heat Shock Protein 70

Escherichia coli -Based Complementation Assay to Study the Chaperone Function of Heat Shock Protein 70

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Defining Hsp33's Redox-regulated Chaperone Activity and Mapping Conformational Changes on Hsp33 Using Hydrogen-deuterium Exchange Mass Spectrometry

Defining Hsp33's Redox-regulated Chaperone Activity and Mapping Conformational Changes on Hsp33 Using Hydrogen-deuterium Exchange Mass Spectrometry

Published on: June 7, 2018

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Last Updated: Jul 4, 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

Escherichia coli -Based Complementation Assay to Study the Chaperone Function of Heat Shock Protein 70

Escherichia coli -Based Complementation Assay to Study the Chaperone Function of Heat Shock Protein 70

Published on: March 8, 2024

Defining Hsp33's Redox-regulated Chaperone Activity and Mapping Conformational Changes on Hsp33 Using Hydrogen-deuterium Exchange Mass Spectrometry

Defining Hsp33's Redox-regulated Chaperone Activity and Mapping Conformational Changes on Hsp33 Using Hydrogen-deuterium Exchange Mass Spectrometry

Published on: June 7, 2018

Main Results:

Intracellular Hsp72 confers cytoprotection via anti-apoptotic and anti-inflammatory pathways.
Extracellular Hsp72 promotes pro-inflammatory responses, enhances dendritic cell maturation, and supports anti-tumor surveillance.
Mechanisms of chaperokine activity transduction are being elucidated.

Conclusions:

Hsp72 functions as a chaperokine with distinct intracellular and extracellular roles.
Extracellular Hsp72 signaling is crucial for immune modulation and anti-tumor responses.
Harnessing Hsp72 chaperokine activity offers potential for novel therapeutic strategies.