| Structural highlights
Disease
[CFTR_HUMAN] Defects in CFTR are the cause of cystic fibrosis (CF) [MIM:219700]; also known as mucoviscidosis. CF is the most common genetic disease in the Caucasian population, with a prevalence of about 1 in 2'000 live births. Inheritance is autosomal recessive. CF is a common generalized disorder of exocrine gland function which impairs clearance of secretions in a variety of organs. It is characterized by the triad of chronic bronchopulmonary disease (with recurrent respiratory infections), pancreatic insufficiency (which leads to malabsorption and growth retardation) and elevated sweat electrolytes.[1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22] [23] [24] [25] [26] [27] [28] [29] [30] [31] [32] [33] [34] [35] [36] [37] [38] [39] [40] [41] [42] [43] [44] [45] [46] Defects in CFTR are the cause of congenital bilateral absence of the vas deferens (CBAVD) [MIM:277180]. CBAVD is an important cause of sterility in men and could represent an incomplete form of cystic fibrosis, as the majority of men suffering from cystic fibrosis lack the vas deferens.[47] [48] [49] [50] [:]
Function
[CFTR_HUMAN] Involved in the transport of chloride ions. May regulate bicarbonate secretion and salvage in epithelial cells by regulating the SLC4A7 transporter. Can inhibit the chloride channel activity of ANO1.[51]
Publication Abstract from PubMed
The most common mutation in cystic fibrosis (CF) patients is deletion of F508 (DeltaF508) in the first nucleotide binding domain (NBD1) of the CF transmembrane conductance regulator (CFTR). DeltaF508 causes a decrease in the trafficking of CFTR to the cell surface and reduces the thermal stability of isolated NBD1; it is well established that both of these effects can be rescued by additional revertant mutations in NBD1. The current paradigm in CF small molecule drug discovery is that, like revertant mutations, a path may exist to DeltaF508 CFTR correction through a small molecule chaperone binding to NBD1. We, therefore, set out to find small molecule binders of NBD1 and test whether it is possible to develop these molecules into potent binders that increase CFTR trafficking in CF-patient-derived human bronchial epithelial cells. Several fragments were identified that bind NBD1 at either the CFFT-001 site or the BIA site. However, repeated attempts to improve the affinity of these fragments resulted in only modest gains. Although these results cannot prove that there is no possibility of finding a high-affinity small molecule binder of NBD1, they are discouraging and lead us to hypothesize that the nature of these two binding sites, and isolated NBD1 itself, may not contain the features needed to build high-affinity interactions. Future work in this area may, therefore, require constructs including other domains of CFTR in addition to NBD1, if high-affinity small molecule binding is to be achieved.
Binding screen for cystic fibrosis transmembrane conductance regulator correctors finds new chemical matter and yields insights into cystic fibrosis therapeutic strategy.,Hall JD, Wang H, Byrnes LJ, Shanker S, Wang K, Efremov IV, Chong PA, Forman-Kay JD, Aulabaugh AE Protein Sci. 2016 Feb;25(2):360-73. doi: 10.1002/pro.2821. Epub 2016 Jan 12. PMID:26444971[52]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
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- ↑ Ferec C, Novelli G, Verlingue C, Quere I, Dallapiccola B, Audrezet MP, Mercier B. Identification of six novel CFTR mutations in a sample of Italian cystic fibrosis patients. Mol Cell Probes. 1995 Apr;9(2):135-7. PMID:7541510
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- ↑ Petreska L, Plaseska D, Koceva S, Stavljenic-Rukavina A, Efremov GD. A novel mutation in exon 12 (Y569C) of the CFTR gene identified in a patient of Croatian origin. Hum Mutat. 1996;7(4):374-5. PMID:8723693 doi:10.1002/humu.1380070402
- ↑ Bienvenu T, Chertkoff L, Beldjord C, Segal E, Carniglia L, Barreiro C, Kaplan JC. Identification of three novel mutations in the cystic fibrosis transmembrane conductance regulator gene in Argentinian CF patients. Hum Mutat. 1996;7(4):376-7. PMID:8723695 doi:<376::AID-HUMU18>3.0.CO;2-# 10.1002/(SICI)1098-1004(1996)7:4<376::AID-HUMU18>3.0.CO;2-#
- ↑ Hughes DJ, Hill AJ, Macek M Jr, Redmond AO, Nevin NC, Graham CA. Mutation characterization of CFTR gene in 206 Northern Irish CF families: thirty mutations, including two novel, account for approximately 94% of CF chromosomes. Hum Mutat. 1996;8(4):340-7. PMID:8956039 doi:<340::AID-HUMU7>3.0.CO;2-B 10.1002/(SICI)1098-1004(1996)8:4<340::AID-HUMU7>3.0.CO;2-B
- ↑ Clavel C, Pennaforte F, Pigeon F, Verlingue C, Birembaut P, Ferec C. Identification of four novel mutations in the cystic fibrosis transmembrane conductance regulator gene: E664X, 2113delA, 306delTAGA, and delta M1140. Hum Mutat. 1997;9(4):368-9. PMID:9101301 doi:<368::AID-HUMU13>3.0.CO;2-0 10.1002/(SICI)1098-1004(1997)9:4<368::AID-HUMU13>3.0.CO;2-0
- ↑ Gouya L, Pascaud O, Munck A, Elion J, Denamur E. Novel mutation (A141D) in exon 4 of the CFTR gene identified in an Algerian patient. Hum Mutat. 1997;10(1):86-7. PMID:9222768 doi:<86::AID-HUMU15>3.0.CO;2-W 10.1002/(SICI)1098-1004(1997)10:1<86::AID-HUMU15>3.0.CO;2-W
- ↑ Casals T, Pacheco P, Barreto C, Gimenez J, Ramos MD, Pereira S, Pinheiro JA, Cobos N, Curvelo A, Vazquez C, Rocha H, Seculi JL, Perez E, Dapena J, Carrilho E, Duarte A, Palacio AM, Nunes V, Lavinha J, Estivill X. Missense mutation R1066C in the second transmembrane domain of CFTR causes a severe cystic fibrosis phenotype: study of 19 heterozygous and 2 homozygous patients. Hum Mutat. 1997;10(5):387-92. PMID:9375855 doi:<387::AID-HUMU9>3.0.CO;2-C 10.1002/(SICI)1098-1004(1997)10:5<387::AID-HUMU9>3.0.CO;2-C
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- ↑ Onay T, Topaloglu O, Zielenski J, Gokgoz N, Kayserili H, Camcioglu Y, Cokugras H, Akcakaya N, Apak M, Tsui LC, Kirdar B. Analysis of the CFTR gene in Turkish cystic fibrosis patients: identification of three novel mutations (3172delAC, P1013L and M1028I). Hum Genet. 1998 Feb;102(2):224-30. PMID:9521595
- ↑ Bombieri C, Benetazzo M, Saccomani A, Belpinati F, Gile LS, Luisetti M, Pignatti PF. Complete mutational screening of the CFTR gene in 120 patients with pulmonary disease. Hum Genet. 1998 Dec;103(6):718-22. PMID:9921909
- ↑ Vankeerberghen A, Wei L, Jaspers M, Cassiman JJ, Nilius B, Cuppens H. Characterization of 19 disease-associated missense mutations in the regulatory domain of the cystic fibrosis transmembrane conductance regulator. Hum Mol Genet. 1998 Oct;7(11):1761-9. PMID:9736778
- ↑ Malone G, Haworth A, Schwarz MJ, Cuppens H, Super M. Detection of five novel mutations of the cystic fibrosis transmembrane regulator (CFTR) gene in Pakistani patients with cystic fibrosis: Y569D, Q98X, 296+12(T>C), 1161delC and 621+2(T>C). Hum Mutat. 1998;11(2):152-7. PMID:9482579 doi:<152::AID-HUMU8>3.0.CO;2-L 10.1002/(SICI)1098-1004(1998)11:2<152::AID-HUMU8>3.0.CO;2-L
- ↑ Leoni GB, Pitzalis S, Tonelli R, Cao A. Identification of a novel mutation (S13F) in the CFTR gene in a CF patient of Sardinian origin. Hum Mutat. 1998;11(4):337. PMID:9554753
- ↑ Feldmann D, Sardet A, Cougoureux E, Plouvier E, Fontaine JL, Tournier G, Aymard P. Identification of three novel mutations in the CFTR gene, R117P, deltaD192, and 3121-1G-->A in four French patients. Hum Mutat. 1998;Suppl 1:S78-80. PMID:9452048
- ↑ Casals T, Ramos MD, Gimenez J, Nadal M, Nunes V, Estivill X. Paternal origin of a de novo novel CFTR mutation (L1065R) causing cystic fibrosis. Hum Mutat. 1998;Suppl 1:S99-102. PMID:9452054
- ↑ Shackleton S, Harris A. A 2-amino acid insertion mutation (1243insACAAAA) in exon 7 of the CFTR gene. Hum Mutat. 1998;Suppl 1:S156-7. PMID:9452073
- ↑ Picci L, Cameran M, Olante P, Zacchello F, Scarpa M. Identification of a D579G homozygote cystic fibrosis patient with pancreatic sufficiency and minor lung involvement. Mutations in brief no. 221. Online. Hum Mutat. 1999;13(2):173. PMID:10094564 doi:<173::AID-HUMU19>3.0.CO;2-E 10.1002/(SICI)1098-1004(1999)13:2<173::AID-HUMU19>3.0.CO;2-E
- ↑ Mercier B, Verlingue C, Lissens W, Silber SJ, Novelli G, Bonduelle M, Audrezet MP, Ferec C. Is congenital bilateral absence of vas deferens a primary form of cystic fibrosis? Analyses of the CFTR gene in 67 patients. Am J Hum Genet. 1995 Jan;56(1):272-7. PMID:7529962
- ↑ Jezequel P, Dorval I, Fergelot P, Chauvel B, Le Treut A, Le Gall JY, Le Lannou D, Blayau M. Structural analysis of CFTR gene in congenital bilateral absence of vas deferens. Clin Chem. 1995 Jun;41(6 Pt 1):833-5. PMID:7539342
- ↑ Zielenski J, Patrizio P, Markiewicz D, Asch RH, Tsui LC. Identification of two mutations (S50Y and 4173delC) in the CFTR gene from patients with congenital bilateral absence of vas deferens (CBAVD). Hum Mutat. 1997;9(2):183-4. PMID:9067761 doi:<183::AID-HUMU13>3.0.CO;2-Z 10.1002/(SICI)1098-1004(1997)9:2<183::AID-HUMU13>3.0.CO;2-Z
- ↑ Bienvenu T, Bousquet S, Vidaud D, Hubert D, Francoual C, Beldjord C, Kaplan JC. A novel missense mutation D513G in exon 10 of the cystic fibrosis transmembrane conductance regulator (CFTR) gene identified in a French CBAVD patient. Mutations in brief no. 175. Online. Hum Mutat. 1998;12(3):213-4. PMID:10651488
- ↑ Ousingsawat J, Kongsuphol P, Schreiber R, Kunzelmann K. CFTR and TMEM16A are separate but functionally related Cl- channels. Cell Physiol Biochem. 2011;28(4):715-24. doi: 10.1159/000335765. Epub 2011 Dec, 14. PMID:22178883 doi:10.1159/000335765
- ↑ Hall JD, Wang H, Byrnes LJ, Shanker S, Wang K, Efremov IV, Chong PA, Forman-Kay JD, Aulabaugh AE. Binding screen for cystic fibrosis transmembrane conductance regulator correctors finds new chemical matter and yields insights into cystic fibrosis therapeutic strategy. Protein Sci. 2016 Feb;25(2):360-73. doi: 10.1002/pro.2821. Epub 2016 Jan 12. PMID:26444971 doi:http://dx.doi.org/10.1002/pro.2821
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