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Updated: Jul 1, 2025

Characterize Disease-related Mutants of RAF Family Kinases by Using a Set of Practical and Feasible Methods
Published on: July 17, 2019
Structural dynamics of RAF1-HSP90-CDC37 and HSP90 complexes reveal asymmetric client interactions and key structural
Lorenzo I Finci1, Mayukh Chakrabarti1, Gulcin Gulten1
1NCI RAS Initiative, Cancer Research Technology Program, Frederick National Laboratory for Cancer Research, Frederick, MD, USA.
The heat shock protein 90 (HSP90) chaperone complex, with cochaperone CDC37, facilitates the folding of RAF1 kinase. Cryo-EM structures reveal how HSP90 and CDC37 interact with RAF1 to guide its proper molecular assembly.
Area of Science:
- Molecular biology
- Structural biology
- Biochemistry
Background:
- RAF kinases are crucial components of the RAS-MAPK signaling pathway.
- The proper folding of RAF1 is dependent on the chaperone HSP90 and its cochaperone CDC37.
Purpose of the Study:
- To elucidate the molecular mechanisms of RAF1 folding mediated by HSP90 and CDC37.
- To determine the structural basis of the RAF1-HSP90-CDC37 complex.
Main Methods:
- Cryo-electron microscopy (cryo-EM) to determine complex structures.
- Atomistic molecular dynamics simulations (1 μs).
- Energetic decomposition and comparative structural analysis.
Main Results:
- The cryo-EM structure of the closed-state RAF1-HSP90-CDC37 complex was determined.
- CDC37 acts as a bridge, connecting HSP90 and RAF1 interactions.
- HSP90 undergoes conformational changes between closed and semi-open states during RAF1 binding.
Conclusions:
- HSP90 and CDC37 play critical roles in mediating RAF1 client protein folding.
- The study provides detailed insights into the chaperone-assisted protein folding process.
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09:39Exploring Biomolecular Interaction Between the Molecular Chaperone Hsp90 and Its Client Protein Kinase Cdc37 using Field-Effect Biosensing Technology
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