Related Experiment Video
Updated: Jul 15, 2026
08:59
4D Imaging of Protein Aggregation in Live Cells
Published on: April 5, 2013
Protein misassembly: macromolecular crowding and molecular chaperones
1Department of Biological Sciences, University of Warwick, Coventry CV4 7AL, UK. jellis@bio.warwick.ac.uk
Advances in Experimental Medicine and Biology
|January 9, 2007
Summary
Cells face a universal challenge with proteins misassembling into harmful structures. Molecular chaperones are crucial for preventing this protein aggregation within crowded cellular environments.
Area of Science:
- Biochemistry
- Cell Biology
- Molecular Biology
Background:
- Cells contend with the inherent tendency of proteins to misfold and aggregate.
- High macromolecular concentrations within cells exacerbate the risk of nonfunctional and cytotoxic protein structures.
- Protein misassembly poses a fundamental threat to cellular function and viability.
Purpose of the Study:
- To review the evidence supporting the role of molecular chaperones in preventing protein misassembly.
- To discuss key concepts related to chaperone function in cellular proteostasis.
- To highlight the importance of chaperones in overcoming challenges posed by intracellular crowding.
Main Methods:
- Literature review of studies on protein misfolding and molecular chaperones.
- Synthesis of key concepts in protein aggregation and cellular quality control.
- Discussion of evidence for chaperone-mediated prevention of cytotoxic protein structures.
Main Results:
- Molecular chaperones are essential for preventing the formation of nonfunctional and cytotoxic protein aggregates.
- Chaperone activity is critical for maintaining proteostasis in the crowded cellular milieu.
- The review consolidates evidence demonstrating chaperones as a solution to the universal problem of protein misassembly.
Conclusions:
- Molecular chaperones play a vital role in maintaining cellular health by preventing protein misassembly.
- Understanding chaperone mechanisms is key to addressing diseases associated with protein aggregation.
- Chaperones are indispensable for cellular survival in high-concentration macromolecular environments.
Related Concept Videos
02:41Protein 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.
Many viruses self-assemble into a fully functional unit using the infected host cell to...
Many viruses self-assemble into a fully functional unit using the infected host cell to...
03:03Amyloid Fibrils
Amyloid fibrils are aggregates of misfolded proteins. Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils.
Amyloid deposits were observed as early as 1639 in the liver and the spleen. In 1854, Rudolph Virchow performed iodine staining, normally used to...
Amyloid deposits were observed as early as 1639 in the liver and the spleen. In 1854, Rudolph Virchow performed iodine staining, normally used to...
03:00Molecular 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...
The...
02:41Protein 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.
Many viruses self-assemble into a fully functional unit using the infected host cell to...
Many viruses self-assemble into a fully functional unit using the infected host cell to...
03:00Molecular 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...
The...
01:26Bacterial 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...