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Related Concept Videos

Molecular Chaperones and Protein Folding03:00

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 Folding03:00

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 Maturation01:26

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...
Coordination of Gene Expression Processes in Bacteria01:29

Coordination of Gene Expression Processes in Bacteria

The DNA replication, transcription, and translation processes are intricately coupled in bacteria, allowing efficient gene expression and rapid protein synthesis. While this physical and functional coordination is advantageous, it introduces challenges that bacteria overcome through specific regulatory mechanisms.Coupling of Replication, Transcription, and TranslationThe coupling of replication, transcription, and translation is a hallmark of bacterial gene expression. As the replisome unwinds...
Other Stress Responses in Bacteria01:30

Other Stress Responses in Bacteria

Bacteria have global regulatory systems that control several types of stress mechanisms. These include Pho regulon and the heat shock response, which are essential systems for environmental adaptation, such as nutrient limitation and proteotoxic stress. The Pho regulon and the heat shock response exemplify bacterial resilience, enabling rapid adaptation to fluctuating environmental conditions.Pho RegulonBacteria require phosphorus for essential cellular processes, including nucleic acid...
Cytoskeletal Proteins in Bacteria01:29

Cytoskeletal Proteins in Bacteria

Bacterial cells were initially considered simple, randomly organized structures lacking a cytoskeleton. However, the discovery of cytoskeleton homologs in bacteria led to the change of this opinion. Bacterial cytoskeletal filaments regulate the cell shape, cell polarity, cell division, and partitioning of plasmids during cell division. It was later discovered that bacterial cytoskeletal proteins, mainly actin and tubulin homologs, are diverse compared to their eukaryotic counterparts. On the...

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Updated: Jun 23, 2026

Detection of the pH-dependent Activity of Escherichia coli Chaperone HdeB In Vitro and In Vivo
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Detection of the pH-dependent Activity of Escherichia coli Chaperone HdeB In Vitro and In Vivo

Published on: October 23, 2016

Multiple chaperonins in bacteria--why so many?

Peter A Lund1

  • 1School of Biosciences, University of Birmingham, Birmingham, UK. p.a.lund@bham.ac.uk

FEMS Microbiology Reviews
|May 7, 2009
PubMed
Summary
This summary is machine-generated.

Many bacteria use multiple chaperonins, which are essential protein-folding machines. This review explores evidence suggesting these multiple chaperonins may have specialized cellular roles, rather than just increasing general protein-folding capacity.

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Last Updated: Jun 23, 2026

Detection of the pH-dependent Activity of Escherichia coli Chaperone HdeB In Vitro and In Vivo
08:32

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Published on: October 23, 2016

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In Situ Monitoring of Transiently Formed Molecular Chaperone Assemblies in Bacteria, Yeast, and Human Cells
08:58

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

Published on: September 2, 2019

Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Chaperonins are molecular chaperones crucial for protein folding in bacteria.
  • They typically form large complexes of 14 subunits, like the well-studied Escherichia coli GroEL.
  • A significant number of bacteria possess multiple distinct chaperonin genes.

Purpose of the Study:

  • To investigate the functional roles of multiple chaperonin genes in bacteria.
  • To determine if multiple chaperonins enhance general folding capacity or specialize in specific cellular functions.

Main Methods:

  • Review of existing genetic evidence.
  • Biochemical analyses of chaperonin function.
  • Phylogenetic studies of chaperonin gene evolution.

Main Results:

  • Evidence suggests that multiple chaperonins are not merely for increased general chaperoning ability.
  • There is good support for functional specialization among different chaperonin genes within the same cell.
  • Homologues from different bacteria can functionally replace E. coli GroEL, but the presence of multiple genes suggests evolved specificity.

Conclusions:

  • Multiple chaperonin genes in bacteria likely confer specialized functions.
  • This specialization may allow bacteria to adapt to specific cellular demands or environmental conditions.
  • Further research is needed to fully elucidate the distinct roles of each chaperonin.