Open AccessNucleotide‐binding domain 1 of cystic fibrosis transmembrane conductance regulator
Author(s) -
Duffieux Francis,
Annereau JeanPhilippe,
Boucher Julien,
Miclet Emeric,
Pamlard Olivier,
Schneider Michael,
Stoven Véronique,
Lallemand JeanYves
Publication year - 2000
Publication title -
european journal of biochemistry
Language(s) - English
Resource type - Journals
eISSN - 1432-1033
pISSN - 0014-2956
DOI - 10.1046/j.1432-1327.2000.01614.x
Subject(s) - cyclic nucleotide binding domain , cystic fibrosis transmembrane conductance regulator , atp binding cassette transporter , cystic fibrosis , transmembrane domain , mutation , biology , biochemistry , chemistry , nucleotide , computational biology , gene , genetics , transporter
Cystic fibrosis is caused by mutations in the gene encoding the cystic fibrosis transmembrane conductance regulator (CFTR). This protein belongs to the large ATP‐binding cassette (ABC) family of transporters. Most patients with cystic fibrosis bear a mutation in the nucleotide‐binding domain 1 (NBD1) of CFTR, which plays a key role in the activation of the channel function of CFTR. Determination of the three dimensional structure of NBD1 is essential to better understand its structure–function relationship, and relate it to the biological features of CFTR. In this paper, we report the first preparation of recombinant His‐tagged NBD1, as a soluble, stable and isolated domain. The method avoids the use of renaturing processes or fusion constructs. ATPase activity assays show that the recombinant domain is functional. Using tryptophan intrinsic fluorescence, we point out that the local conformation, in the region of the most frequent mutation ΔF508, could differ from that of the nucleotide‐binding subunit of histidine permease, the only available ABC structure. We have undertaken three dimensional structure determination of NBD1, and the first two dimensional 15 N‐ 1 H NMR spectra demonstrate that the domain is folded. The method should be applicable to the structural studies of NBD2 or of other NBDs from different ABC proteins of major biological interest, such as multidrug resistance protein 1 or multidrug resistance associated protein 1.