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Cystic Fibrosis: A Brief Look at Some Highlights of a Decade of Research Focused on Elucidating and Correcting the Molecular Basis of the Disease

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Abstract

The disease Cystic Fibrosis (CF) is caused by mutations in the protein called CFTR, cystic fibrosis transmembrane conductance regulator, an ABC-transporter–like protein found in the plasma membrane of animal cells. CFTR is believed to function primarily as a Cl− channel, but evidence is mounting that this protein has other roles as well. Structurally, CFTR consists of a single polypeptide chain (1480 amino acids) that folds into 5 distinct domains. These include 2 transmembrane domains that are involved in channel formation; 2 nucleotide-binding domains (NBF1 and NBF2), the first of which clearly binds and hydrolyzes ATP; and 1 regulatory domain (R) that is phosphorylated in a cAMP-dependent process. Currently, the 3D structure of neither CFTR nor its domains has been elucidated, although both nucleotide domains have been modeled in 3D, and solution structures in 3D have been obtained for peptide segments of NBF1. The most common mutation causing CF is the deletion (Δ) of a single phenylalanine (F) in position 508 within a putative helix located in NBF1. CF patients bearing this ΔF508 mutation frequently experience chronic lung infections, particularly by Pseudomonas aeruginosa, and have a life span that rarely exceeds the age of 30. Since the CFTR gene was cloned and sequenced in 1989, there has been over a decade of research focused on understanding the molecular basis of CF caused by the ΔF508 mutation, with the ultimate objective of using the knowledge gained to carry out additional research designed to correct the underlying defect. In general, this pioneering or “ground roots” research has succeeded according to plan. This brief review summarizes some of the highlights with a focus on those studies conducted in the authors' laboratory. For us, this research has been both exciting and rewarding mainly because the results obtained, despite very limited funding, have provided considerable insight, not only into the chemical, molecular, and pathogenic basis of CF, but have made it possible for us and others to now develop novel, chemically rational, and “cost effective” strategies to identify agents that correct the structural defect in the Δ F508 CFTR protein causing most cases of CF.

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  1. Young Hee Ko
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  2. Peter L. Pedersen
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Ko, Y.H., Pedersen, P.L. Cystic Fibrosis: A Brief Look at Some Highlights of a Decade of Research Focused on Elucidating and Correcting the Molecular Basis of the Disease. J Bioenerg Biomembr 33, 513–521 (2001). https://doi.org/10.1023/A:1012831322753

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