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- PDB-8fzq: Dehosphorylated, ATP-bound human cystic fibrosis transmembrane co... -

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Basic information

Entry
Database: PDB / ID: 8fzq
TitleDehosphorylated, ATP-bound human cystic fibrosis transmembrane conductance regulator (CFTR)
ComponentsCystic fibrosis transmembrane conductance regulator
KeywordsMEMBRANE PROTEIN / Ion Channel
Function / homology
Function and homology information


positive regulation of voltage-gated chloride channel activity / positive regulation of cyclic nucleotide-gated ion channel activity / Sec61 translocon complex binding / channel-conductance-controlling ATPase / intracellularly ATP-gated chloride channel activity / positive regulation of enamel mineralization / transepithelial water transport / RHO GTPases regulate CFTR trafficking / intracellular pH elevation / amelogenesis ...positive regulation of voltage-gated chloride channel activity / positive regulation of cyclic nucleotide-gated ion channel activity / Sec61 translocon complex binding / channel-conductance-controlling ATPase / intracellularly ATP-gated chloride channel activity / positive regulation of enamel mineralization / transepithelial water transport / RHO GTPases regulate CFTR trafficking / intracellular pH elevation / amelogenesis / ATPase-coupled inorganic anion transmembrane transporter activity / chloride channel inhibitor activity / Golgi-associated vesicle membrane / multicellular organismal-level water homeostasis / membrane hyperpolarization / cholesterol transport / bicarbonate transport / bicarbonate transmembrane transporter activity / vesicle docking involved in exocytosis / chloride channel regulator activity / chloride transmembrane transporter activity / sperm capacitation / chloride channel activity / RHOQ GTPase cycle / cholesterol biosynthetic process / positive regulation of exocytosis / positive regulation of insulin secretion involved in cellular response to glucose stimulus / chloride channel complex / ATPase-coupled transmembrane transporter activity / ABC-type transporter activity / cellular response to cAMP / cellular response to forskolin / chloride transmembrane transport / isomerase activity / response to endoplasmic reticulum stress / establishment of localization in cell / PDZ domain binding / Defective CFTR causes cystic fibrosis / Late endosomal microautophagy / clathrin-coated endocytic vesicle membrane / ABC-family proteins mediated transport / recycling endosome / transmembrane transport / Aggrephagy / Chaperone Mediated Autophagy / recycling endosome membrane / Cargo recognition for clathrin-mediated endocytosis / Clathrin-mediated endocytosis / early endosome membrane / protein-folding chaperone binding / early endosome / endosome membrane / Ub-specific processing proteases / apical plasma membrane / lysosomal membrane / endoplasmic reticulum membrane / enzyme binding / cell surface / ATP hydrolysis activity / protein-containing complex / ATP binding / membrane / nucleus / plasma membrane / cytoplasm / cytosol
Similarity search - Function
: / CFTR regulator domain / Cystic fibrosis TM conductance regulator (CFTR), regulator domain / Cystic fibrosis transmembrane conductance regulator / ABC transporter transmembrane region / ABC transporter type 1, transmembrane domain / ABC transporter integral membrane type-1 fused domain profile. / ABC transporter type 1, transmembrane domain superfamily / ABC transporter-like, conserved site / ABC transporters family signature. ...: / CFTR regulator domain / Cystic fibrosis TM conductance regulator (CFTR), regulator domain / Cystic fibrosis transmembrane conductance regulator / ABC transporter transmembrane region / ABC transporter type 1, transmembrane domain / ABC transporter integral membrane type-1 fused domain profile. / ABC transporter type 1, transmembrane domain superfamily / ABC transporter-like, conserved site / ABC transporters family signature. / ABC transporter / ABC transporter-like, ATP-binding domain / ATP-binding cassette, ABC transporter-type domain profile. / ATPases associated with a variety of cellular activities / AAA+ ATPase domain / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
ADENOSINE-5'-TRIPHOSPHATE / Cystic fibrosis transmembrane conductance regulator
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 4.3 Å
AuthorsLevring, J. / Terry, D.S. / Kilic, Z. / Fitzgerald, G.A. / Blanchard, S.C. / Chen, J.
Funding support United States, 2items
OrganizationGrant numberCountry
Howard Hughes Medical Institute (HHMI) United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM079238 United States
CitationJournal: Nature / Year: 2023
Title: CFTR function, pathology and pharmacology at single-molecule resolution.
Authors: Jesper Levring / Daniel S Terry / Zeliha Kilic / Gabriel Fitzgerald / Scott C Blanchard / Jue Chen /
Abstract: The cystic fibrosis transmembrane conductance regulator (CFTR) is an anion channel that regulates salt and fluid homeostasis across epithelial membranes. Alterations in CFTR cause cystic fibrosis, a ...The cystic fibrosis transmembrane conductance regulator (CFTR) is an anion channel that regulates salt and fluid homeostasis across epithelial membranes. Alterations in CFTR cause cystic fibrosis, a fatal disease without a cure. Electrophysiological properties of CFTR have been analysed for decades. The structure of CFTR, determined in two globally distinct conformations, underscores its evolutionary relationship with other ATP-binding cassette transporters. However, direct correlations between the essential functions of CFTR and extant structures are lacking at present. Here we combine ensemble functional measurements, single-molecule fluorescence resonance energy transfer, electrophysiology and kinetic simulations to show that the two nucleotide-binding domains (NBDs) of human CFTR dimerize before channel opening. CFTR exhibits an allosteric gating mechanism in which conformational changes within the NBD-dimerized channel, governed by ATP hydrolysis, regulate chloride conductance. The potentiators ivacaftor and GLPG1837 enhance channel activity by increasing pore opening while NBDs are dimerized. Disease-causing substitutions proximal (G551D) or distal (L927P) to the ATPase site both reduce the efficiency of NBD dimerization. These findings collectively enable the framing of a gating mechanism that informs on the search for more efficacious clinical therapies.
History
DepositionJan 29, 2023Deposition site: RCSB / Processing site: RCSB
Revision 1.0Mar 29, 2023Provider: repository / Type: Initial release
Revision 1.1May 3, 2023Group: Database references / Category: citation / citation_author
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation_author.identifier_ORCID
Revision 1.2Jun 19, 2024Group: Data collection / Category: chem_comp_atom / chem_comp_bond

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Cystic fibrosis transmembrane conductance regulator
hetero molecules


Theoretical massNumber of molelcules
Total (without water)169,9225
Polymers168,8591
Non-polymers1,0634
Water00
1


  • Idetical with deposited unit
  • defined by author
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein Cystic fibrosis transmembrane conductance regulator / CFTR / ATP-binding cassette sub-family C member 7 / Channel conductance-controlling ATPase / cAMP- ...CFTR / ATP-binding cassette sub-family C member 7 / Channel conductance-controlling ATPase / cAMP-dependent chloride channel


Mass: 168859.062 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: CFTR, ABCC7 / Production host: Homo sapiens (human)
References: UniProt: P13569, channel-conductance-controlling ATPase
#2: Chemical ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: Mg / Feature type: SUBJECT OF INVESTIGATION
#3: Chemical ChemComp-ATP / ADENOSINE-5'-TRIPHOSPHATE


Mass: 507.181 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C10H16N5O13P3 / Feature type: SUBJECT OF INVESTIGATION / Comment: ATP, energy-carrying molecule*YM
Has ligand of interestY
Sequence detailsResidues visible in the regulatory domain were modeled as UNK because the identities of the ...Residues visible in the regulatory domain were modeled as UNK because the identities of the residues could not be established, and the register is unknown. The actual sequence of the entire contruct that was used for the EM sample is: MQRSPLEKASVVSKLFFSWTRPILRKGYRQRLELSDIYQIPSVDSADNLSEKLEREWDRELASKKNPKLINALRRCFFWR FMFYGIFLYLGEVTKAVQPLLLGRIIASYDPDNKEERSIAIYLGIGLCLLFIVRTLLLHPAIFGLHHIGMQMRIAMFSLI YKKTLKLSSRVLDKISIGQLVSLLSNNLNKFDEGLALAHFVWIAPLQVALLMGLIWELLQASAFCGLGFLIVLALFQAGL GRMMMKYRDQRAGKISERLVITSEMIENIQSVKAYCWEEAMEKMIENLRQTELKLTRKAAYVRYFNSSAFFFSGFFVVFL SVLPYALIKGIILRKIFTTISFCIVLRMAVTRQFPWAVQTWYDSLGAINKIQDFLQKQEYKTLEYNLTTTEVVMENVTAF WEEGFGELFEKAKQNNNNRKTSNGDDSLFFSNFSLLGTPVLKDINFKIERGQLLAVAGSTGAGKTSLLMVIMGELEPSEG KIKHSGRISFCSQFSWIMPGTIKENIIFGVSYDEYRYRSVIKACQLEEDISKFAEKDNIVLGEGGITLSGGQRARISLAR AVYKDADLYLLDSPFGYLDVLTEKEIFESCVCKLMANKTRILVTSKMEHLKKADKILILHEGSSYFYGTFSELQNLQPDF SSKLMGCDSFDQFSAERRNSILTETLHRFSLEGDAPVSWTETKKQSFKQTGEFGEKRKNSILNPINSIRKFSIVQKTPLQ MNGIEEDSDEPLERRLSLVPDSEQGEAILPRISVISTGPTLQARRRQSVLNLMTHSVNQGQNIHRKTTASTRKVSLAPQA NLTELDIYSRRLSQETGLEISEEINEEDLKECFFDDMESIPAVTTWNTYLRYITVHKSLIFVLIWCLVIFLAEVAASLVV LWLLGNTPLQDKGNSTHSRNNSYAVIITSTSSYYVFYIYVGVADTLLAMGFFRGLPLVHTLITVSKILHHKMLHSVLQAP MSTLNTLKAGGILNRFSKDIAILDDLLPLTIFDFIQLLLIVIGAIAVVAVLQPYIFVATVPVIVAFIMLRAYFLQTSQQL KQLESEGRSPIFTHLVTSLKGLWTLRAFGRQPYFETLFHKALNLHTANWFLYLSTLRWFQMRIEMIFVIFFIAVTFISIL TTGEGEGRVGIILTLAMNIMSTLQWAVNSSIDVDSLMRSVSRVFKFIDMPTEGKPTKSTKPYKNGQLSKVMIIENSHVKK DDIWPSGGQMTVKDLTAKYTEGGNAILENISFSISPGQRVGLLGRTGSGKSTLLSAFLRLLNTEGEIQIDGVSWDSITLQ QWRKAFGVIPQKVFIFSGTFRKNLDPYEQWSDQEIWKVADEVGLRSVIEQFPGKLDFVLVDGGCVLSHGHKQLMCLARSV LSKAKILLLDEPSAHLDPVTYQIIRRTLKQAFADCTVILCEHRIEAMLECQQFLVIEENKVRQYDSIQKLLNERSLFRQA ISPSDRVKLFPHRNSSKCKSKPQIAALKEETEEEVQDTRLSNSLEVLFQ

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: Dephosphorylated, ATP-bound human cystic fibrosis transmembrane conductance regulator (CFTR)
Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 7.2
SpecimenConc.: 5.5 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2500 nm / Nominal defocus min: 800 nm
Image recordingElectron dose: 75.4 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

Software
NameVersionClassificationNB
phenix.real_space_refine1.20.1_4487refinement
PHENIX1.20.1_4487refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 4.3 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 157629 / Symmetry type: POINT
RefinementCross valid method: NONE
Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2
Displacement parametersBiso mean: 88.51 Å2
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0029436
ELECTRON MICROSCOPYf_angle_d0.50812771
ELECTRON MICROSCOPYf_dihedral_angle_d4.0631244
ELECTRON MICROSCOPYf_chiral_restr0.0381478
ELECTRON MICROSCOPYf_plane_restr0.0031560

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