| Structural highlightsDisease[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 cystic fibrosis transmembrane conductance regulator (CFTR) is an anion channel important in maintaining proper functions of the lung, pancreas, and intestine. The activity of CFTR is regulated by ATP and protein kinase A-dependent phosphorylation. To understand the conformational changes elicited by phosphorylation and ATP binding, we present here the structure of phosphorylated, ATP-bound human CFTR, determined by cryoelectron microscopy to 3.2-A resolution. This structure reveals the position of the R domain after phosphorylation. By comparing the structures of human CFTR and zebrafish CFTR determined under the same condition, we identified common features essential to channel gating. The differences in their structures indicate plasticity permitted in evolution to achieve the same function. Finally, the structure of CFTR provides a better understanding of why the G178R, R352Q, L927P, and G970R/D mutations would impede conformational changes of CFTR and lead to cystic fibrosis.
Molecular structure of the ATP-bound, phosphorylated human CFTR.,Zhang Z, Liu F, Chen J Proc Natl Acad Sci U S A. 2018 Nov 20. pii: 1815287115. doi:, 10.1073/pnas.1815287115. PMID:30459277[52]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See AlsoReferences
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- ↑ 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
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- ↑ 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
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- ↑ 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
- ↑ Zhang Z, Liu F, Chen J. Molecular structure of the ATP-bound, phosphorylated human CFTR. Proc Natl Acad Sci U S A. 2018 Nov 20. pii: 1815287115. doi:, 10.1073/pnas.1815287115. PMID:30459277 doi:http://dx.doi.org/10.1073/pnas.1815287115
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