Hsp110 nucleotide exchange factors may amplify Hsp70-disaggregation by enhanced entropic pulling
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View abstract on PubMed
Summary
This summary is machine-generated.Heat shock proteins (Hsp70s) use ATP to unfold proteins and require nucleotide exchange factors (NEFs). Hsp110 proteins, evolved from Hsp70s, act as NEFs and enhance Hsp70
Area Of Science
- Molecular biology
- Protein folding
- Chaperone proteins
Background
- Hsp70 chaperones utilize ATP hydrolysis to unfold proteins and disaggregate protein structures.
- Hsp70 function requires interaction with J-domain proteins (JDPs), substrates, and nucleotide exchange factors (NEFs).
- In eukaryotes, Hsp110s replaced bacterial GrpE as NEFs, despite belonging to the Hsp70 superfamily, posing an evolutionary question.
Purpose Of The Study
- To investigate the evolutionary origins and mechanism of Hsp110 as a NEF.
- To determine if Hsp110 evolved novel properties or repurposed existing Hsp70 features.
Main Methods
- Utilized wild-type Sse1 (yeast Hsp110) and rationally designed mutants.
- Conducted experiments to analyze Hsp110's interaction with Hsp70 and its NEF activity.
Main Results
- Hsp110 appears to repurpose existing Hsp70 features rather than acquiring entirely new molecular properties.
- Hsp110 functions as a NEF and enhances the unfolding and disaggregating activity of Hsp70.
- Hsp110 increases Hsp70's effective volume, boosting entropic pulling forces.
Conclusions
- Hsp110 evolved from Hsp70s by repurposing ancestral features.
- Hsp110 acts as a NEF and potentiates Hsp70's chaperone activity through a novel mechanism.
- This study elucidates the evolution and function of Hsp110 in protein homeostasis.
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