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Proteomic interaction profiling reveals KIFC1 as a factor involved in early targeting of F508del-CFTR to degradation
Authors:Sara Canato  João D Santos  Ana S Carvalho  Kerman Aloria  Margarida D Amaral  Rune Matthiesen  André O Falcao  Carlos M Farinha
Institution:1.Department of Chemistry and Biochemistry & BioISI-Biosystems and Integrative Sciences Institute, Faculty of Sciences,University of Lisboa,Lisbon,Portugal;2.CEDOC-Chronic Diseases Research Centre, Nova Medical School, Faculdade de Ciências Médicas,Universidade Nova de Lisboa,Lisbon,Portugal;3.Proteomics Core Facility-SGIKER,University of the Basque Country UPV/EHU,Vizcaya,Spain;4.LASIGE, Faculty of Sciences,University of Lisboa,Lisbon,Portugal
Abstract:Misfolded F508del-CFTR, the main molecular cause of the recessive disorder cystic fibrosis, is recognized by the endoplasmic reticulum (ER) quality control (ERQC) resulting in its retention and early degradation. The ERQC mechanisms rely mainly on molecular chaperones and on sorting motifs, whose presence and exposure determine CFTR retention or exit through the secretory pathway. Arginine-framed tripeptides (AFTs) are ER retention motifs shown to modulate CFTR retention. However, the interactions and regulatory pathways involved in this process are still largely unknown. Here, we used proteomic interaction profiling and global bioinformatic analysis to identify factors that interact differentially with F508del-CFTR and F508del-CFTR without AFTs (F508del-4RK-CFTR) as putative regulators of this specific ERQC checkpoint. Using LC–MS/MS, we identified kinesin family member C1 (KIFC1) as a stronger interactor with F508del-CFTR versus F508del-4RK-CFTR. We further validated this interaction showing that decreasing KIFC1 levels or activity stabilizes the immature form of F508del-CFTR by reducing its degradation. We conclude that the current approach is able to identify novel putative therapeutic targets that can be ultimately used to the benefit of CF patients.
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