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Covalently Linked Protein Regulators

Covalently Linked Protein Regulators

Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein.

Covalently Linked Protein Regulators

Covalently Linked Protein Regulators

Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein.

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...

Protein Folding Quality Check in the RER

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Related Experiment Video

Updated: May 26, 2026

Quantifying Tissue-Specific Proteostatic Decline in Caenorhabditis elegans

Quantifying Tissue-Specific Proteostatic Decline in Caenorhabditis elegans

Published on: September 7, 2021

Small-molecule proteostasis regulators for protein conformational diseases.

Barbara Calamini¹, Maria Catarina Silva, Franck Madoux

¹Department of Molecular Biosciences, Rice Institute for Biomedical Research, Northwestern University, Evanston, Illinois, USA.

Nature Chemical Biology

|December 27, 2011

Summary

Researchers screened nearly one million small molecules to find new ways to boost protein homeostasis (proteostasis). These molecules activate heat shock transcription factor-1 (HSF-1) to improve protein folding and cell health, offering a new therapeutic strategy for protein conformational diseases.

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Quantifying Tissue-Specific Proteostatic Decline in Caenorhabditis elegans

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Area of Science:

Cellular Biology
Molecular Biology
Biochemistry

Background:

Protein homeostasis (proteostasis) is crucial for cellular and organismal health.
Stress, aging, and misfolded proteins disrupt proteostasis.
Heat shock transcription factor-1 (HSF-1) regulates molecular chaperones to restore proteostasis.

Purpose of the Study:

To identify novel small molecules that regulate proteostasis.
To investigate the mechanism of HSF-1-dependent chaperone expression.
To evaluate the therapeutic potential of these regulators in conformational disease models.

Main Methods:

Screening of approximately 900,000 small molecules.
Assessing HSF-1-dependent chaperone expression.
Testing proteostasis restoration in multiple conformational disease models.

Main Results:

Identification of new classes of small-molecule proteostasis regulators.
Demonstration of HSF-1-dependent induction of chaperone expression.
Restoration of protein folding and proteome stability in disease models.

Conclusions:

Novel small molecules can modulate the proteostasis network.
These regulators act through HSF-1, FOXO, Nrf-2, and chaperone machinery.
Targeting proteostasis offers a promising therapeutic avenue for protein conformational diseases.