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Related Concept Videos

Cystic Fibrosis: Pathogenesis01:23

Cystic Fibrosis: Pathogenesis

Cystic fibrosis (CF), an autosomal recessive disorder, significantly affects the function of exocrine glands. This genetically inherited disease is characterized by the production of thick and sticky mucus, which can severely affect various organs and systems in the body.
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Related Experiment Video

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A Robust Polymerase Chain Reaction-based Assay for Quantifying Cytosine-guanine-guanine Trinucleotide Repeats in Fragile X Mental Retardation-1 Gene
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CFTR mutations altering CFTR fragmentation.

Kendra Tosoni1, Michelle Stobbart, Diane M Cassidy

  • 1Division of Medical Sciences, University of Dundee, Ninewells Hospital, Dundee DD1 9SY, U.K.

The Biochemical Journal
|October 17, 2012
PubMed
Summary
This summary is machine-generated.

Cystic fibrosis (CF) is often caused by the F508del mutation in the CFTR protein. This study reveals that CFTR fragments, not fully degraded, show unique patterns linked to mutations and protein kinase CK2 interactions.

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Functional Reconstitution and Channel Activity Measurements of Purified Wildtype and Mutant CFTR Protein

Published on: March 9, 2015

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • Cystic fibrosis (CF) commonly arises from the F508del mutation in the CFTR {CF transmembrane-conductance regulator} protein.
  • This mutation leads to endoplasmic reticulum (ER) degradation of the mutant CFTR.
  • Understanding CFTR processing and degradation is crucial for developing effective CF therapies.

Purpose of the Study:

  • To investigate the fragmentation patterns of wild-type CFTR and the F508delCFTR mutant.
  • To explore the relationship between CFTR fragmentation, mutations, and interactions with protein kinase CK2.
  • To determine if F508delCFTR is completely degraded or exists as fragments.

Main Methods:

  • Utilized stably CFTR-expressing baby-hamster kidney (BHK) cell lines.
  • Analyzed CFTR fragments in BHK cells and natively expressing human bronchial epithelial (HBE) cells.
  • Investigated fragmentation patterns of wild-type CFTR and mutant CFTR (F508del, S511A, and other CK2-related mutants).

Main Results:

  • Wild-type CFTR and F508delCFTR are cleaved into differently sized N- and C-terminal fragments, each containing a nucleotide-binding domain (NBD).
  • The F508del mutation generates a unique fragmentation 'fingerprint' with multiple smaller fragments (ladder pattern) in BHK cells.
  • Mutations affecting protein kinase CK2 interaction sites (e.g., S511A) produce distinct fragmentation patterns compared to wild-type and F508del.

Conclusions:

  • The F508delCFTR mutant is not completely degraded and exhibits a specific fragmentation pattern.
  • CFTR fragmentation is linked to its sequence, particularly near putative CK2-interactive sites.
  • These findings suggest a relationship between CFTR processing, mutation type, and interactions with protein kinase CK2.