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- EMDB-48717: Complex of the phosphorylated human cystic fibrosis transmembrane... -

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Basic information

Entry
Database: EMDB / ID: EMD-48717
TitleComplex of the phosphorylated human cystic fibrosis transmembrane conductance regulator (CFTR) with (R)-BPO-27 and ATP/Mg
Map dataMap of the CFTR (E1371Q)/ATP/(R)-BPO-27 complex.
Sample
  • Complex: Complex of CFTR with the small molecule inhibitor (R)-BPO-27
    • Protein or peptide: Cystic fibrosis transmembrane conductance regulator
  • Ligand: (6R,12R)-6-(5-bromofuran-2-yl)-7,9-dimethyl-8,10-dioxo-11-phenyl-7,8,9,10-tetrahydro-6H-pyrimido[4',5':3,4]pyrrolo[2,1-c][1,4]benzoxazine-2-carboxylic acid
  • Ligand: MAGNESIUM ION
  • Ligand: ADENOSINE-5'-TRIPHOSPHATE
  • Ligand: CHLORIDE ION
  • Ligand: water
KeywordsInhibitor / CFTR / MEMBRANE PROTEIN
Function / homology
Function and homology information


Sec61 translocon complex binding / channel-conductance-controlling ATPase / intracellularly ATP-gated chloride channel activity / positive regulation of enamel mineralization / RHO GTPases regulate CFTR trafficking / transepithelial water transport / intracellular pH elevation / amelogenesis / chloride channel inhibitor activity / : ...Sec61 translocon complex binding / channel-conductance-controlling ATPase / intracellularly ATP-gated chloride channel activity / positive regulation of enamel mineralization / RHO GTPases regulate CFTR trafficking / transepithelial water transport / intracellular pH elevation / amelogenesis / chloride channel inhibitor activity / : / multicellular organismal-level water homeostasis / water transport / Golgi-associated vesicle membrane / chloride channel regulator activity / cholesterol transport / bicarbonate transmembrane transporter activity / bicarbonate transport / membrane hyperpolarization / chloride transmembrane transporter activity / cholesterol biosynthetic process / sperm capacitation / RHOQ GTPase cycle / chloride channel activity / chloride channel complex / ABC-type transporter activity / 14-3-3 protein binding / cellular response to forskolin / establishment of localization in cell / response to endoplasmic reticulum stress / cellular response to cAMP / chloride transmembrane transport / Developmental Lineage of Pancreatic Ductal Cells / PDZ domain binding / 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 / basolateral plasma membrane / early endosome / endosome membrane / apical plasma membrane / Ub-specific processing proteases / 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 ...: / 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
Cystic fibrosis transmembrane conductance regulator
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.1 Å
AuthorsYoung PG / Fiedorczuk K / Chen J
Funding support United States, 2 items
OrganizationGrant numberCountry
Howard Hughes Medical Institute (HHMI) United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)T32GM152349 United States
CitationJournal: Nat Commun / Year: 2025
Title: Structure of CFTR bound to (R)-BPO-27 unveils a pore-blockage mechanism.
Authors: Paul G Young / Karol Fiedorczuk / Jue Chen /
Abstract: Hyperactivation of the cystic fibrosis transmembrane conductance regulator (CFTR) contributes to secretory diarrhea, a major cause of pediatric mortality worldwide, and autosomal dominant polycystic ...Hyperactivation of the cystic fibrosis transmembrane conductance regulator (CFTR) contributes to secretory diarrhea, a major cause of pediatric mortality worldwide, and autosomal dominant polycystic kidney disease (ADPKD), the most common inherited cause of end-stage renal disease. Selective CFTR inhibition is a potential therapeutic strategy, with (R)-BPO-27 emerging as a promising candidate. Here, we present a cryo-EM structure of CFTR bound to (R)-BPO-27 at an overall resolution of 2.1 Å. Contrary to the previous hypothesis that it inhibits CFTR current by competition with ATP, we demonstrate that (R)-BPO-27 instead directly occludes the chloride-conducting pore while permitting ATP hydrolysis, thus uncoupling the two activities. Furthermore, we find that inhibitor binding requires some degree of NBD separation, as the inhibition rate inversely correlates with the probability NBD dimerization. These findings clarify the compound's mechanism and provide a molecular basis for optimizing its clinical potential.
History
DepositionJan 20, 2025-
Header (metadata) releaseAug 6, 2025-
Map releaseAug 6, 2025-
UpdateFeb 18, 2026-
Current statusFeb 18, 2026Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_48717.png

Downloads & links

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Map

FileDownload / File: emd_48717.map.gz / Format: CCP4 / Size: 325 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationMap of the CFTR (E1371Q)/ATP/(R)-BPO-27 complex.
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.68 Å/pix.
x 440 pix.
= 297.44 Å		0.68 Å/pix.
x 440 pix.
= 297.44 Å		0.68 Å/pix.
x 440 pix.
= 297.44 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.676 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.007
Minimum - Maximum-0.019710185 - 0.05878611
Average (Standard dev.)0.000007921848 (±0.0013791543)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions440440440
Spacing440440440
CellA=B=C: 297.44 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: Half map of the CFTR (E1371Q)/ATP/(R)-BPO-27 complex.

Fileemd_48717_half_map_1.map
AnnotationHalf map of the CFTR (E1371Q)/ATP/(R)-BPO-27 complex.
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Half map of the CFTR (E1371Q)/ATP/(R)-BPO-27 complex.

Fileemd_48717_half_map_2.map
AnnotationHalf map of the CFTR (E1371Q)/ATP/(R)-BPO-27 complex.
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Complex of CFTR with the small molecule inhibitor (R)-BPO-27

EntireName: Complex of CFTR with the small molecule inhibitor (R)-BPO-27
Components
  • Complex: Complex of CFTR with the small molecule inhibitor (R)-BPO-27
    • Protein or peptide: Cystic fibrosis transmembrane conductance regulator
  • Ligand: (6R,12R)-6-(5-bromofuran-2-yl)-7,9-dimethyl-8,10-dioxo-11-phenyl-7,8,9,10-tetrahydro-6H-pyrimido[4',5':3,4]pyrrolo[2,1-c][1,4]benzoxazine-2-carboxylic acid
  • Ligand: MAGNESIUM ION
  • Ligand: ADENOSINE-5'-TRIPHOSPHATE
  • Ligand: CHLORIDE ION
  • Ligand: water

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Supramolecule #1: Complex of CFTR with the small molecule inhibitor (R)-BPO-27

SupramoleculeName: Complex of CFTR with the small molecule inhibitor (R)-BPO-27
type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 168 KDa

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Macromolecule #1: Cystic fibrosis transmembrane conductance regulator

MacromoleculeName: Cystic fibrosis transmembrane conductance regulator / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO / EC number: channel-conductance-controlling ATPase
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 168.334469 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: MQRSPLEKAS VVSKLFFSWT RPILRKGYRQ RLELSDIYQI PSVDSADNLS EKLEREWDRE LASKKNPKLI NALRRCFFWR FMFYGIFLY LGEVTKAVQP LLLGRIIASY DPDNKEERSI AIYLGIGLCL LFIVRTLLLH PAIFGLHHIG MQMRIAMFSL I YKKTLKLS ...String:
MQRSPLEKAS VVSKLFFSWT RPILRKGYRQ RLELSDIYQI PSVDSADNLS EKLEREWDRE LASKKNPKLI NALRRCFFWR FMFYGIFLY LGEVTKAVQP LLLGRIIASY DPDNKEERSI AIYLGIGLCL LFIVRTLLLH PAIFGLHHIG MQMRIAMFSL I YKKTLKLS SRVLDKISIG QLVSLLSNNL NKFDEGLALA HFVWIAPLQV ALLMGLIWEL LQASAFCGLG FLIVLALFQA GL GRMMMKY RDQRAGKISE RLVITSEMIE NIQSVKAYCW EEAMEKMIEN LRQTELKLTR KAAYVRYFNS SAFFFSGFFV VFL SVLPYA LIKGIILRKI FTTISFCIVL RMAVTRQFPW AVQTWYDSLG AINKIQDFLQ KQEYKTLEYN LTTTEVVMEN VTAF WEEGF GELFEKAKQN NNNRKTSNGD DSLFFSNFSL LGTPVLKDIN FKIERGQLLA VAGSTGAGKT SLLMVIMGEL EPSEG KIKH SGRISFCSQF SWIMPGTIKE NIIFGVSYDE YRYRSVIKAC QLEEDISKFA EKDNIVLGEG GITLSGGQRA RISLAR AVY KDADLYLLDS PFGYLDVLTE KEIFESCVCK LMANKTRILV TSKMEHLKKA DKILILHEGS SYFYGTFSEL QNLQPDF SS KLMGCDSFDQ FSAERRNSIL TETLHRFSLE GDAPVSWTET KKQSFKQTGE FGEKRKNSIL NPINSIRKFS IVQKTPLQ M NGIEEDSDEP LERRLSLVPD SEQGEAILPR ISVISTGPTL QARRRQSVLN LMTHSVNQGQ NIHRKTTAST RKVSLAPQA NLTELDIYSR RLSQETGLEI SEEINEEDLK ECFFDDMESI PAVTTWNTYL RYITVHKSLI FVLIWCLVIF LAEVAASLVV LWLLGNTPL QDKGNSTHSR NNSYAVIITS TSSYYVFYIY VGVADTLLAM GFFRGLPLVH TLITVSKILH HKMLHSVLQA P MSTLNTLK AGGILNRFSK DIAILDDLLP LTIFDFIQLL LIVIGAIAVV AVLQPYIFVA TVPVIVAFIM LRAYFLQTSQ QL KQLESEG RSPIFTHLVT SLKGLWTLRA FGRQPYFETL FHKALNLHTA NWFLYLSTLR WFQMRIEMIF VIFFIAVTFI SIL TTGEGE GRVGIILTLA MNIMSTLQWA VNSSIDVDSL MRSVSRVFKF IDMPTEGKPT KSTKPYKNGQ LSKVMIIENS HVKK DDIWP SGGQMTVKDL TAKYTEGGNA ILENISFSIS PGQRVGLLGR TGSGKSTLLS AFLRLLNTEG EIQIDGVSWD SITLQ QWRK AFGVIPQKVF IFSGTFRKNL DPYEQWSDQE IWKVADEVGL RSVIEQFPGK LDFVLVDGGC VLSHGHKQLM CLARSV LSK AKILLLDQPS AHLDPVTYQI IRRTLKQAFA DCTVILCEHR IEAMLECQQF LVIEENKVRQ YDSIQKLLNE RSLFRQA IS PSDRVKLFPH RNSSKCKSKP QIAALKEETE EEVQDTRL

UniProtKB: Cystic fibrosis transmembrane conductance regulator

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Macromolecule #2: (6R,12R)-6-(5-bromofuran-2-yl)-7,9-dimethyl-8,10-dioxo-11-phenyl-...

MacromoleculeName: (6R,12R)-6-(5-bromofuran-2-yl)-7,9-dimethyl-8,10-dioxo-11-phenyl-7,8,9,10-tetrahydro-6H-pyrimido[4',5':3,4]pyrrolo[2,1-c][1,4]benzoxazine-2-carboxylic acid
type: ligand / ID: 2 / Number of copies: 1 / Formula: A1BUJ
Molecular weightTheoretical: 548.342 Da

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Macromolecule #3: MAGNESIUM ION

MacromoleculeName: MAGNESIUM ION / type: ligand / ID: 3 / Number of copies: 2 / Formula: MG
Molecular weightTheoretical: 24.305 Da

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Macromolecule #4: ADENOSINE-5'-TRIPHOSPHATE

MacromoleculeName: ADENOSINE-5'-TRIPHOSPHATE / type: ligand / ID: 4 / Number of copies: 2 / Formula: ATP
Molecular weightTheoretical: 507.181 Da
Chemical component information

ChemComp-ATP:
ADENOSINE-5'-TRIPHOSPHATE / ATP, energy-carrying molecule*YM

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Macromolecule #5: CHLORIDE ION

MacromoleculeName: CHLORIDE ION / type: ligand / ID: 5 / Number of copies: 1 / Formula: CL
Molecular weightTheoretical: 35.453 Da

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Macromolecule #6: water

MacromoleculeName: water / type: ligand / ID: 6 / Number of copies: 6 / Formula: HOH
Molecular weightTheoretical: 18.015 Da
Chemical component information

ChemComp-HOH:
WATER

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

Concentration5.2 mg/mL
BufferpH: 7.5
VitrificationCryogen name: ETHANE / Chamber humidity: 100 %

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 65.6 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 2.5 µm / Nominal defocus min: 0.5 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionSoftware - Name: CTFFIND / Type: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: PDB ENTRY
PDB model - PDB ID:

6msm

Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.1 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION / Number images used: 160342
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
FSC plot (resolution estimation)

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