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Structure of nucleotide-binding domain 1 of the cystic fibrosis transmembrane conductance regulator
Cystic fibrosis transmembrane conductance regulator (CFTR) is an ATP‐binding cassette (ABC) transporter that functions as a chloride channel. Nucleotide‐binding domain 1 (NBD1), one of two ABC domains in CFTR, also contains sites for the predominant CF‐causing mutation and, potentially, for regulato...
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Published in: | The EMBO journal 2004-01, Vol.23 (2), p.282-293 |
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Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that cite this one |
Online Access: | Get full text |
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Summary: | Cystic fibrosis transmembrane conductance regulator (CFTR) is an ATP‐binding cassette (ABC) transporter that functions as a chloride channel. Nucleotide‐binding domain 1 (NBD1), one of two ABC domains in CFTR, also contains sites for the predominant CF‐causing mutation and, potentially, for regulatory phosphorylation. We have determined crystal structures for mouse NBD1 in unliganded, ADP‐ and ATP‐bound states, with and without phosphorylation. This NBD1 differs from typical ABC domains in having added regulatory segments, a foreshortened subdomain interconnection, and an unusual nucleotide conformation. Moreover, isolated NBD1 has undetectable ATPase activity and its structure is essentially the same independent of ligand state. Phe508, which is commonly deleted in CF, is exposed at a putative NBD1‐transmembrane interface. Our results are consistent with a CFTR mechanism, whereby channel gating occurs through ATP binding in an NBD1–NBD2 nucleotide sandwich that forms upon displacement of NBD1 regulatory segments. |
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ISSN: | 0261-4189 1460-2075 |
DOI: | 10.1038/sj.emboj.7600040 |