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Updated: Jul 15, 2025

Functional Reconstitution and Channel Activity Measurements of Purified Wildtype and Mutant CFTR Protein
Published on: March 9, 2015
Small molecule correctors divert CFTR-F508del from ERAD by stabilizing sequential folding states
Celeste Riepe1, Magda Wąchalska1, Kirandeep K Deol2,3,4
1Department of Biology, Stanford University, Stanford, CA, USA 94305.
Cystic fibrosis (CF) treatments target the F508del mutation in cystic fibrosis transmembrane conductance regulator (CFTR) protein. This study identifies key molecular machinery involved in CFTR-F508del degradation, revealing how correctors improve CFTR protein levels.
Area of Science:
- Molecular Biology
- Genetics
- Cell Biology
Background:
- Over 80% of cystic fibrosis (CF) patients have the F508del mutation, leading to misfolded cystic fibrosis transmembrane conductance regulator (CFTR) protein.
- Misfolded CFTR is degraded via endoplasmic reticulum associated degradation (ERAD), a process targeted by current CF therapies.
- A deeper understanding of CFTR-F508del ERAD machinery is needed for improved corrector development.
Conclusions:
- CFTR-F508del ERAD involves a buffered system with redundant ubiquitin ligases, including RNF5 and RNF185.
- Small molecule correctors like tezacaftor and elexacaftor appear to function by stabilizing folding intermediates resistant to RNF5-mediated degradation.
- This work provides insights into CFTR-F508del ERAD, potentially guiding the development of more effective CF therapies.
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