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- PDB-8v7z: Phosphorylated, ATP-bound, E1371Q human cystic fibrosis transmemb... -

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Entry
Database: PDB / ID: 8v7z
TitlePhosphorylated, ATP-bound, E1371Q human cystic fibrosis transmembrane conductance regulator (E1371Q-CFTR)
ComponentsCystic fibrosis transmembrane conductance regulator
KeywordsMEMBRANE PROTEIN / cystic fibrosis / chloride channel / hydrolysis-deficient mutant
Function / homology
Function and homology information


positive regulation of voltage-gated chloride 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 / amelogenesis / intracellular pH elevation ...positive regulation of voltage-gated chloride 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 / amelogenesis / intracellular pH elevation / chloride channel inhibitor activity / : / Golgi-associated vesicle membrane / multicellular organismal-level water homeostasis / cholesterol transport / bicarbonate transport / bicarbonate transmembrane transporter activity / chloride channel regulator activity / vesicle docking involved in exocytosis / membrane hyperpolarization / chloride transmembrane transporter activity / sperm capacitation / cholesterol biosynthetic process / RHOQ GTPase cycle / chloride channel activity / positive regulation of exocytosis / ATPase-coupled transmembrane transporter activity / chloride channel complex / positive regulation of insulin secretion involved in cellular response to glucose stimulus / ABC-type transporter activity / 14-3-3 protein binding / cellular response to forskolin / chloride transmembrane transport / response to endoplasmic reticulum stress / cellular response to cAMP / PDZ domain binding / establishment of localization in cell / clathrin-coated endocytic vesicle membrane / Defective CFTR causes cystic fibrosis / Late endosomal microautophagy / recycling endosome / ABC-family proteins mediated transport / transmembrane transport / recycling endosome membrane / Chaperone Mediated Autophagy / Aggrephagy / Cargo recognition for clathrin-mediated endocytosis / Clathrin-mediated endocytosis / protein-folding chaperone binding / early endosome membrane / early endosome / endosome membrane / Ub-specific processing proteases / apical plasma membrane / lysosomal membrane / endoplasmic reticulum membrane / enzyme binding / cell surface / protein-containing complex / ATP hydrolysis activity / ATP binding / nucleus / membrane / 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 ...: / 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 / CHOLESTEROL / Chem-POV / Cystic fibrosis transmembrane conductance regulator
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.4 Å
AuthorsGao, X. / Hwang, T.
Funding support United States, 2items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of Diabetes and Digestive and Kidney Disease (NIH/NIDDK) United States
Cystic Fibrosis Foundation United States
CitationJournal: Nat Commun / Year: 2024
Title: Allosteric inhibition of CFTR gating by CFTRinh-172 binding in the pore.
Authors: Xiaolong Gao / Han-I Yeh / Zhengrong Yang / Chen Fan / Fan Jiang / Rebecca J Howard / Erik Lindahl / John C Kappes / Tzyh-Chang Hwang /
Abstract: Loss-of-function mutations of the CFTR gene cause the life-shortening genetic disease cystic fibrosis (CF), whereas overactivity of CFTR may lead to secretory diarrhea and polycystic kidney disease. ...Loss-of-function mutations of the CFTR gene cause the life-shortening genetic disease cystic fibrosis (CF), whereas overactivity of CFTR may lead to secretory diarrhea and polycystic kidney disease. While effective drugs targeting the CFTR protein have been developed for the treatment of CF, little progress has been made for diseases caused by hyper-activated CFTR. Here, we solve the cryo-EM structure of CFTR in complex with CFTRinh-172 (Inh-172), a CFTR gating inhibitor with promising potency and efficacy. We find that Inh-172 binds inside the pore of CFTR, interacting with amino acid residues from transmembrane segments (TMs) 1, 6, 8, 9, and 12 through mostly hydrophobic interactions and a salt bridge. Substitution of these residues lowers the apparent affinity of Inh-172. The inhibitor-bound structure reveals re-orientations of the extracellular segment of TMs 1, 8, and 12, supporting an allosteric modulation mechanism involving post-binding conformational changes. This allosteric inhibitory mechanism readily explains our observations that pig CFTR, which preserves all the amino acid residues involved in Inh-172 binding, exhibits a much-reduced sensitivity to Inh-172 and that the apparent affinity of Inh-172 is altered by the CF drug ivacaftor (i.e., VX-770) which enhances CFTR's activity through binding to a site also comprising TM8.
History
DepositionDec 4, 2023Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jul 17, 2024Provider: repository / Type: Initial release
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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Cystic fibrosis transmembrane conductance regulator
hetero molecules


Theoretical massNumber of molelcules
Total (without water)166,76911
Polymers161,5191
Non-polymers5,25010
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy, not applicable
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: 161518.891 Da / Num. of mol.: 1 / Mutation: E1371Q
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: CFTR, ABCC7 / Production host: Cricetulus griseus (Chinese hamster)
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
#3: Chemical ChemComp-ATP / ADENOSINE-5'-TRIPHOSPHATE


Mass: 507.181 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C10H16N5O13P3 / Comment: ATP, energy-carrying molecule*YM
#4: Chemical
ChemComp-POV / (2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate / POPC


Mass: 760.076 Da / Num. of mol.: 5 / Source method: obtained synthetically / Formula: C42H82NO8P / Comment: phospholipid*YM
#5: Chemical ChemComp-CLR / CHOLESTEROL


Mass: 386.654 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C27H46O
Has ligand of interestN
Has protein modificationN

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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: E1371Q-CFTR / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Cricetulus griseus (Chinese hamster)
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: OTHER
Electron lensMode: OTHER / Nominal defocus max: 2500 nm / Nominal defocus min: 500 nm
Image recordingElectron dose: 1.33375 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

EM softwareName: PHENIX / Category: model refinement
CTF correctionType: NONE
3D reconstructionResolution: 3.4 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 261806 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0029162
ELECTRON MICROSCOPYf_angle_d0.56512389
ELECTRON MICROSCOPYf_dihedral_angle_d4.691225
ELECTRON MICROSCOPYf_chiral_restr0.0411439
ELECTRON MICROSCOPYf_plane_restr0.0041497

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