Related Experiment Video
Updated: Jul 26, 2026
08:32
Detection of the pH-dependent Activity of Escherichia coli Chaperone HdeB In Vitro and In Vivo
Published on: October 23, 2016
[PSI+], SUP35, and chaperones
1Department of Molecular Genetics and Cell Biology, University of Chicago, Chicago, Illinois 60637, USA.
Advances in Protein Chemistry
|July 13, 2001
Summary
Yeast prions share similarities with mammalian amyloid proteins, offering simpler models for studying protein misfolding. Understanding yeast prion mechanisms, like chaperone roles, can illuminate broader eukaryotic processes and epigenetic inheritance.
Area of Science:
- Biochemistry
- Molecular Biology
- Genetics
Background:
- Yeast prions ([PSI+] and [URE3]) exhibit biochemical similarities to mammalian amyloidogenic proteins.
- Studying yeast prions offers advantages over mammalian models due to ease of genetic manipulation and in vitro systems.
- Mammalian amyloid formation is linked to disease, while yeast prions can be compatible with growth and potentially beneficial.
Purpose of the Study:
- To explore the similarities and differences between yeast and mammalian prion systems.
- To investigate the potential of yeast models for understanding amyloid-related disorders.
- To elucidate the mechanisms of prion formation, replication, and epigenetic inheritance.
Main Methods:
- Biochemical characterization of yeast prion proteins.
- In vivo mutagenesis in yeast.
- Development of in vitro models for [PSI+] and [URE3].
- Analysis of prion domain modularity and transferability.
Main Results:
- Yeast prion proteins share structural and functional similarities with mammalian amyloidogenic proteins.
- Prion domains are modular and can confer heritable epigenetic alterations when transferred to other proteins.
- Distinct protein domains are responsible for normal function versus prion conversion.
Conclusions:
- Yeast prion systems provide valuable models for studying protein misfolding relevant to human diseases.
- Understanding chaperone interactions and de novo prion formation in yeast offers insights into higher eukaryotes.
- Prion domains can be evolutionarily repurposed, suggesting a broader role in epigenetic regulation and nonconventional genetic elements.
More Related Videos
Related Concept Videos
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...
01:39Mitochondrial Precursor Proteins
Mitochondrial precursors are partially unfolded or loosely folded polypeptide chains. Newly synthesized precursors are inhibited from spontaneously folding into their native conformation by the cytosolic chaperones, heat shock proteins 70 (Hsp70), and mitochondrial import stimulation factors (MSFs). Precursors bound to MSFs are guided to the TOM70-TOM37 receptors, while precursors bound to Hsp70 chaperones are targetted to TOM20-TOM22 receptor complexes.
Most of the mitochondrial precursors...
Most of the mitochondrial precursors...
01:33Coat Assembly and GTPases
Vesicles incorporate different coat protein subunits in different cell locations, which changes the properties of the coat, such as the shape and geometry of the transport vesicles. Thus, vesicle coat proteins also play a significant role in cargo selection.
Coat assembly depends on the local availability of phosphatidylinositol phosphates or PIPs and GTP-binding proteins. Adaptor proteins, which link the coat proteins to the membrane, bind to these PIPs and play a crucial role in controlling...
Coat assembly depends on the local availability of phosphatidylinositol phosphates or PIPs and GTP-binding proteins. Adaptor proteins, which link the coat proteins to the membrane, bind to these PIPs and play a crucial role in controlling...
02:19The Spindle Assembly Checkpoint
The spindle assembly checkpoint is a molecular surveillance mechanism ensuring the fidelity of chromosome segregation during anaphase. The checkpoint monitors the completion of all the prerequisite steps before chromosome segregation to determine whether the segregation process should proceed or be delayed.
Many proteins function together to control the spindle assembly checkpoint. Mutations affecting these proteins may allow cells to proceed into anaphase prematurely, resulting in the...
Many proteins function together to control the spindle assembly checkpoint. Mutations affecting these proteins may allow cells to proceed into anaphase prematurely, resulting in the...
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...