Related Experiment Video
Updated: Apr 19, 2026
08:58
In Situ Monitoring of Transiently Formed Molecular Chaperone Assemblies in Bacteria, Yeast, and Human Cells
Published on: September 2, 2019
7.6K
Multitasking SecB chaperones in bacteria
Ambre Sala1, Patricia Bordes1, Pierre Genevaux1
1Laboratoire de Microbiologie et Génétique Moléculaire, Centre National de la Recherche Scientifique, Université Paul Sabatier, Toulouse, France.
Frontiers in Microbiology
|December 25, 2014
Summary
The SecB chaperone aids protein export in bacteria, working with SecA and other chaperones to maintain proteostasis. Its diverse functions extend beyond proteobacteria, impacting various bacterial species and systems.
Area of Science:
- Microbiology
- Molecular Biology
- Biochemistry
Background:
- The SecB chaperone is crucial for bacterial protein export via the Sec pathway.
- It interacts with the SecA translocase motor for protein targeting to the membrane.
- SecB also plays roles in Sec-independent secretion and general proteostasis.
Purpose of the Study:
- To review the diverse functions of the SecB chaperone.
- To explore SecB's roles beyond canonical protein export in E. coli.
- To highlight SecB-like proteins in other bacteria and their functions.
Main Methods:
- Literature review of SecB chaperone functions.
- Analysis of SecB interactions with other chaperones (trigger factor, DnaK, GroEL).
- Examination of SecB homologs in various bacterial species.
Main Results:
- SecB is essential for Sec-dependent and Sec-independent protein secretion.
- SecB collaborates with other chaperones to regulate proteostasis.
- SecB homologs exhibit diverse roles, including in toxin-antitoxin systems in Mycobacterium tuberculosis.
Conclusions:
- SecB possesses multifaceted roles in bacterial physiology beyond its canonical function.
- The SecB chaperone system is conserved and adapted across diverse bacterial lineages.
- Understanding SecB's varied functions offers insights into bacterial stress response and pathogenesis.
Related Concept Videos
01:29Coordination of Gene Expression Processes in Bacteria
1.0K
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...
1.0K
03:00Molecular Chaperones and Protein Folding
21.1K
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...
21.1K
03:00Molecular Chaperones and Protein Folding
15.8K
15.8K
01:26Bacterial Protein Maturation
737
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...
737
01:27Chemotaxis in E. coli
1.4K
Chemotaxis in Escherichia coli is a sensory-driven motility mechanism that enables bacteria to navigate chemical gradients, moving toward beneficial environments while avoiding harmful conditions. This process relies on a signal transduction system integrating external chemical cues with flagellar motor control.Chemoreceptors and Signal DetectionE. coli detects chemical gradients through methyl-accepting chemotaxis proteins (MCPs), which are membrane-bound chemoreceptors that sense attractants...
1.4K
01:26Bacterial Translocation and Protein Secretion
1.1K
Bacterial protein secretion involves translocation systems to ensure proteins reach their designated locations, including the plasma membrane, periplasm, outer membrane, or the external environment. These translocation systems are vital for bacterial physiology, supporting processes like membrane assembly, enzymatic activity in the periplasm, and interactions with the external environment. The division of labor between Sec and Tat pathways ensures efficiency in handling proteins with diverse...
1.1K