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- PDB-9vq2: Cryo-EM structure of a human flippase mutant ATP11C Q79A-CDC50A i... -

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Basic information

Entry
Database: PDB / ID: 9vq2
TitleCryo-EM structure of a human flippase mutant ATP11C Q79A-CDC50A in the PtdSer-occluded E2-AlF state
Components
  • Cell cycle control protein 50A
  • Phospholipid-transporting ATPase IG
KeywordsTRANSPORT PROTEIN / Lipid transporter flippase / PC bound E2P state
Function / homology
Function and homology information


positive regulation of phospholipid translocation / aminophospholipid flippase activity / aminophospholipid transport / phosphatidylserine flippase activity / protein localization to endosome / phospholipid-translocating ATPase complex / phosphatidylserine floppase activity / positive regulation of protein exit from endoplasmic reticulum / ATPase-coupled intramembrane lipid transporter activity / phosphatidylethanolamine flippase activity ...positive regulation of phospholipid translocation / aminophospholipid flippase activity / aminophospholipid transport / phosphatidylserine flippase activity / protein localization to endosome / phospholipid-translocating ATPase complex / phosphatidylserine floppase activity / positive regulation of protein exit from endoplasmic reticulum / ATPase-coupled intramembrane lipid transporter activity / phosphatidylethanolamine flippase activity / xenobiotic transmembrane transport / P-type phospholipid transporter / phospholipid translocation / azurophil granule membrane / transport vesicle membrane / Ion transport by P-type ATPases / specific granule membrane / positive regulation of neuron projection development / recycling endosome / recycling endosome membrane / late endosome membrane / early endosome membrane / monoatomic ion transmembrane transport / apical plasma membrane / lysosomal membrane / Neutrophil degranulation / endoplasmic reticulum membrane / structural molecule activity / magnesium ion binding / endoplasmic reticulum / Golgi apparatus / ATP hydrolysis activity / ATP binding / membrane / plasma membrane
Similarity search - Function
CDC50/LEM3 family / LEM3 (ligand-effect modulator 3) family / CDC50 family / P-type ATPase, subfamily IV / P-type ATPase, C-terminal / P-type ATPase, N-terminal / Phospholipid-translocating ATPase N-terminal / Phospholipid-translocating P-type ATPase C-terminal / P-type ATPase, cytoplasmic domain N / P-type ATPase actuator domain / P-type ATPase, haloacid dehalogenase domain ...CDC50/LEM3 family / LEM3 (ligand-effect modulator 3) family / CDC50 family / P-type ATPase, subfamily IV / P-type ATPase, C-terminal / P-type ATPase, N-terminal / Phospholipid-translocating ATPase N-terminal / Phospholipid-translocating P-type ATPase C-terminal / P-type ATPase, cytoplasmic domain N / P-type ATPase actuator domain / P-type ATPase, haloacid dehalogenase domain / P-type ATPase, phosphorylation site / P-type ATPase, cytoplasmic domain N / E1-E2 ATPases phosphorylation site. / P-type ATPase, A domain superfamily / P-type ATPase / P-type ATPase, transmembrane domain superfamily / HAD superfamily / HAD-like superfamily
Similarity search - Domain/homology
TETRAFLUOROALUMINATE ION / Chem-P5S / Phospholipid-transporting ATPase IG / Cell cycle control protein 50A
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.4 Å
AuthorsQian, Y. / Abe, K.
Funding support Japan, 1items
OrganizationGrant numberCountry
Japan Science and TechnologyJPMJR22E4 Japan
CitationJournal: J Biol Chem / Year: 2025
Title: Cryo-EM structure of the ATP11C Q79E mutant reveals the structural basis for altered Phospholipid recognition.
Authors: Yuheng Qian / Chai C Gopalasingam / Christoph Gerle / Hideki Shigematsu / Kazuhiro Abe / Atsunori Oshima /
Abstract: Closely related P4-ATPases, ATP11A and ATP11C, act as major phospholipid flippases in the plasma membrane of mammalian cells, with strict substrate specificity for phosphatidylserine (PS) and ...Closely related P4-ATPases, ATP11A and ATP11C, act as major phospholipid flippases in the plasma membrane of mammalian cells, with strict substrate specificity for phosphatidylserine (PS) and phosphatidylethanolamine (PE), but not for phosphatidylcholine (PC), thereby contributing to the asymmetric distribution of PS and PE across bilayers. A previously reported disease-associated Q84E mutation in ATP11A confers the ability to flip PC, implicating the involvement of this conserved residue in substrate specificity. We performed cryo-EM analysis for the equivalent mutant Q79E of ATP11C to address the structural basis for its unusual substrate specificity. Measurement of ATPase activity revealed that the ATP11C Q79E mutant retained PS-dependent activity, whilst gaining robust PC-dependent activity, indicative of expanded substrate specificity, consistent with reported properties in ATP11A Q84E. The cryo-EM structure of ATP11C Q79E mutant in the PC-occluded E2-P state revealed a PC molecule in a reshaped binding pocket. Due to the Q79E mutation and associated conformational changes in its surrounding residues, including Ser91and Asn352, the binding pocket has additional space to accommodate the bulky choline headgroup. Our results provide structural and functional insights into how a single point mutation can alter substrate specificity in a P4-ATPase.
History
DepositionJul 4, 2025Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Nov 26, 2025Provider: repository / Type: Initial release
Revision 1.0Nov 26, 2025Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Nov 26, 2025Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Nov 26, 2025Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Nov 26, 2025Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Nov 26, 2025Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release
Revision 1.1Dec 17, 2025Group: Data collection / Database references / Category: citation / em_admin
Item: _citation.journal_volume / _citation.title / _em_admin.last_update
Revision 1.1Dec 17, 2025Data content type: EM metadata / Data content type: EM metadata / EM metadata / Group: Database references / Experimental summary / Data content type: EM metadata / EM metadata / Category: citation / em_admin / Data content type: EM metadata / EM metadata / EM metadata
Item: _citation.journal_volume / _citation.title / _em_admin.last_update

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Phospholipid-transporting ATPase IG
C: Cell cycle control protein 50A
hetero molecules


Theoretical massNumber of molelcules
Total (without water)167,2719
Polymers165,3042
Non-polymers1,9667
Water181
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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Protein , 2 types, 2 molecules AC

#1: Protein Phospholipid-transporting ATPase IG / ATPase IQ / ATPase class VI type 11C / P4-ATPase flippase complex alpha subunit ATP11C


Mass: 124403.617 Da / Num. of mol.: 1 / Mutation: Q79A
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: ATP11C, ATPIG, ATPIQ / Cell line (production host): Expi293 / Production host: Homo sapiens (human)
References: UniProt: Q8NB49, P-type phospholipid transporter
#2: Protein Cell cycle control protein 50A / P4-ATPase flippase complex beta subunit TMEM30A / Transmembrane protein 30A


Mass: 40900.801 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: TMEM30A, C6orf67, CDC50A / Cell line (production host): Expi293 / Production host: Homo sapiens (human) / References: UniProt: Q9NV96

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Sugars , 2 types, 4 molecules

#3: Polysaccharide alpha-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 383.349 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpa1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/2,2,1/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1a_1-5]/1-2/a4-b1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][a-D-Manp]{}}LINUCSPDB-CARE
#7: Sugar ChemComp-NAG / 2-acetamido-2-deoxy-beta-D-glucopyranose / N-acetyl-beta-D-glucosamine / 2-acetamido-2-deoxy-beta-D-glucose / 2-acetamido-2-deoxy-D-glucose / 2-acetamido-2-deoxy-glucose / N-ACETYL-D-GLUCOSAMINE


Type: D-saccharide, beta linking / Mass: 221.208 Da / Num. of mol.: 3 / Source method: obtained synthetically / Formula: C8H15NO6 / Feature type: SUBJECT OF INVESTIGATION
IdentifierTypeProgram
DGlcpNAcbCONDENSED IUPAC CARBOHYDRATE SYMBOLGMML 1.0
N-acetyl-b-D-glucopyranosamineCOMMON NAMEGMML 1.0
b-D-GlcpNAcIUPAC CARBOHYDRATE SYMBOLPDB-CARE 1.0
GlcNAcSNFG CARBOHYDRATE SYMBOLGMML 1.0

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Non-polymers , 4 types, 4 molecules

#4: Chemical ChemComp-ALF / TETRAFLUOROALUMINATE ION


Mass: 102.975 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: AlF4 / Feature type: SUBJECT OF INVESTIGATION
#5: Chemical ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Mg / Feature type: SUBJECT OF INVESTIGATION
#6: Chemical ChemComp-P5S / O-[(R)-{[(2R)-2,3-bis(octadecanoyloxy)propyl]oxy}(hydroxy)phosphoryl]-L-serine / phosphatidyl serine


Mass: 792.075 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C42H82NO10P / Feature type: SUBJECT OF INVESTIGATION
#8: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Formula: H2O

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Details

Has ligand of interestY
Has protein modificationY

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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: ATP11C Q79A-CDC50A lipid flippase complex / Type: COMPLEX / Entity ID: #1-#2 / Source: RECOMBINANT
Molecular weightValue: 170 kDa/nm / Experimental value: YES
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human) / Cell: Expi293
Buffer solutionpH: 6.5
SpecimenConc.: 6 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportDetails: Glow discharge was performed on both sides of the grid
Grid material: COPPER/RHODIUM / Grid mesh size: 200 divisions/in. / Grid type: Quantifoil R1.2/1.3
VitrificationCryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277.15 K

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Electron microscopy imaging

MicroscopyModel: JEOL CRYO ARM 300
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Calibrated magnification: 60000 X / Nominal defocus max: 1600 nm / Nominal defocus min: 1200 nm / Cs: 2.7 mm
Specimen holderCryogen: NITROGEN / Specimen holder model: JEOL CRYOSPECPORTER
Image recordingElectron dose: 60 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) / Num. of grids imaged: 1 / Num. of real images: 7350
EM imaging opticsEnergyfilter name: In-column Omega Filter / Energyfilter slit width: 20 eV

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Processing

EM software
IDNameVersionCategory
1cryoSPARC4.4particle selection
2SerialEMimage acquisition
4cryoSPARC4.4CTF correction
13cryoSPARC4.43D reconstruction
Image processingDetails: Images were collected using CDS mode
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.4 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 84218 / Symmetry type: POINT
RefinementHighest resolution: 3.4 Å
Stereochemistry target values: REAL-SPACE (WEIGHTED MAP SUM AT ATOM CENTERS)
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0039507
ELECTRON MICROSCOPYf_angle_d0.61212903
ELECTRON MICROSCOPYf_dihedral_angle_d6.8251267
ELECTRON MICROSCOPYf_chiral_restr0.0421463
ELECTRON MICROSCOPYf_plane_restr0.0051608

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